Application of dry cell hho gas generator with pulse width modulation on sinjai spark ignition engine performance

IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
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Volume: 05 Issue: 02 | Feb-2016, Available @ http://www.ijret.org 105
APPLICATION OF DRY CELL HHO GAS GENERATOR WITH PULSE
WIDTH MODULATION ON SINJAI SPARK IGNITION ENGINE
PERFORMANCE
Bambang Sudarmanta1
, Sudjud Darsopuspito2
, Djoko Sungkono3
1, 2, 3
Fuels and Combustion Engineering Laboratory, Department of Mechanical Engineering, Sepuluh Nopember
Institut of Technology, Surabaya, Indonesia
Abstract
Dry cell HHO gas generator performance optimization was done by varying the duty cycle of pulse width modulation, pwm. HHO
gas generated subsequently applied to the Sinjai spark ignition engine port injection, 2-cylinder 650 cc with gas inlet mechanism
using a venturi. Variations performed on HHO gas generator is the duty cycle of pwm, ie 20%, 40%, 60%, 80% and 100% (or the
same as non pwm). The parameters of performance were calculated includes specific energy input, efficiency and temperature of
the HHO generator. HHO gas is obtained then used as a fuel mixture in the Sinjai engine and inserted through a venturi
mechanism which is mounted on the duct of combustion air inlet. Furthermore, the effect of the addition of HHO gas on the
performance of the Sinjai engine measured includes parameters of torque, power, BMEP, specific fuel consumption and thermal
efficiency. Sinjai engine performance optimization done on setting ignition timing for minimum advance for best torque, MBT
mechanism. The results show that optimum performance of HHO gas generator is generated by pwm system with 40% duty cycle
with parameters such as specific energy input of 33,121 MJ/kg, generator efficiency of 20,064% and generator temperature can
be maintained below 60 0
C. Application of HHO gas generator in point above on standart ignition timing Sinjai engine produce
in an increase of performance such as torque, power, BMEP and thermal efficiency respectively of 2.27%, 2.76% and 3.05% and
a decrease of bsfc 7.76 %. Retarded ignition timing is adjusted to MBT is able to increase performance such as torque, power,
thermal efficiency, respectively 6.55%, 7,65%, 15,50% and a decrease of bsfc 22,06 %.
Keywords: Sinjai Engine, HHO Gas Generator, HHO Gas, PWM, MBT And Engine Performance
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1. INTRODUCTION
Hydrogen is one of the new and renewable energy which
has a calorific value of 120 MJ/kg. The energy value is
much greater than with gasoline, diesel or CNG gas fuel
resvectively [1]. One way to get hydrogen is by electrolysis
of water, a method for separating hydrogen and oxygen in
water using an electric current. The equipment used is called
HHO gas generator, which consists of dry and wet type.
Electrolysis process at the HHO gas generator will separate
the atoms bond 2H2O into 2H2 and O2, which this gas is
known as HHO gas or Brown's gas [2,3].
HHO gas can be used as a fuel extender for gasoline, diesel
or CNG gas to then be used in internal and external
combustion engines. Although currently HHO gas only used
as a fuel extender, but in the future with continuing research,
HHO gas is expected to main energy source for Otto and
Diesel engines. Results of combustion from HHO gas
extender in gasoline or diesel fuel can improve engine
performance and reduce pollution levels [4,5,6].
HHO gas generator system direct connection can cause the
temperature rise in the generator until it reaches 90 °C. This
can cause the tube material HHO gas generators can not
stand and will undergo melting. If the temperature continues
to rise, it will also reduce the quality of HHO gas because
the gas produced will be mixed with water vapor. Research
on the optimization of HHO gas generators continue to be
developed to get the best HHO gas production at
temperatures below 70 °C [7].
Research on the HHO gas continues to be developed,
especially to produce optimum of HHO gas quality. Many
variations have been done, which consists of variations of
electrode type, coil and composition, type of catalyst used,
and type of water. But all of them still have not been able to
produce HHO gas quality as expected. The next
development is to control the input electrical current from
the power source to the HHO gas generator. Pulse width
modulation, pwm is an electronic circuit that is able to
regulate current input into HHO gas generator, which can be
set is duty cycle and frequency of current input [8]. Through
the setting duty cycle and frequency current into HHO gas
generator is expected to lower the temperature of the HHO
gas generator which rose drastically on without pwm
generator, so that no water vapor from the resulting HHO
gas generators and the construction of the generator can be
more durable. Pwm adjustable parameters to be varied to
produce a pure HHO gas generator at a temperature below
600
C.
HHO gas generator application in an internal combustion
engine that has been done by several researchers [9,10,11].

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Novriyandi[9] apply HHO gas generator on a 150 cc
motorcycle. The results showed there has been increased
performance such as power, torque, mean effective pressure,
thermal efficiency, respectively increased by 12.96%,
13.59%, 15.09% and 20.83% and sfc decreased by 22, 22%.
Musmar and Rousan research results[10] showed that the
addition of HHO gas generator with wet type of engine can
reduce specific fuel consumption, the content of nitrogen
oxide emissions and carbon monoxide, respectively 30%,
50% and 20%. Aminuddin [11] using CNG gas fuel for
engines Sinjai and the results showed a decrease in the
content of CO and HC emissions respectively 30.91% and
19.9%.
Based on these descriptions, this paper explains the
application of HHO gas generator dry cell type with pulse
width modulation on Sinjai spark ignition engine
performance.
2. LITERATURE REVIEW
2.1. Review of HHO Gas
Water (H2O) is a compound that is most important in life,
which consists of a compound of hydrogen (H2) and oxygen
(O2). While gas HHO gas is a result of the decomposition of
pure water (H2O) through electrolysis process [3], as shown
in Figure 1.
Figure 1. Decomposition of water molecules into HHO Gas
The electrolysis of water is basically done by passing an
electric current through the water to the two electrodes
(cathode and anode) as show in Fig 2. In order for the
electrolysis process can happen quickly, the water is mixed
with a liquid electrolyte as a catalyst. Electrode is useful as a
conductor of electric current from the power supply voltage
source to the water to be electrolyzed. At electrolysis using
DC current, the electrodes are divided into two poles:
positive as the anode and negative as the cathode. Electrode
material influence on HHO gas production from water
electrolysis process so that the electrode material must be
selected from a material which has electrical conductivity
and good corrosion resistance. Electrodes used in this
research using 316 L type of stainless steel plate.
By dissolving the amount of electrolytes in the water will
increase the value of the electrical conductivity of water.
Thus, the rate of the reaction to decompose water molecules
(H2O) into H2 and O2 becomes faster and also can reduce the
energy needed for electrolysis process [2]. If the electrolyte
in an amount more dissolved into the water, the electrical
conductivity of the water will be higher, causing the value of
HHO gas production rate will also increase. However, if the
electrolyte is too much dissolved into the water, the energy
required to produce HHO gas will also increase due to the
electrolyte solution is saturated causing movement of ions in
the electrolyte to be blocked. In this study, the electrolyte
used is potassium hydroxide (KOH) [9].
Figure 2. Schematic hydrolysis process of water
Acid equilibrium reaction:
Cathode (Reduction)
Anode (Oxidation)
Base equilibrium reaction:
Cathode (Reduction)
Anode (Oxidation)
Overall reaction:
If the electrolyte used is an alkaline solution such as KOH,
base reaction will occur. On this base reaction, a reduction
reaction occurs on the cathode where water molecules bind
electrons (e-) and then be broken into hydrogen gas (H2)
and anion OH-. The OH- anions are attracted to the anode
side and will be broken into oxygen gas and H2O molecular
(l). Hydrogen gas has several characteristics are: colorless,
flammable, very light and very easy to react with other
chemicals. However HHO gas under normal conditions does
not burn by itself without ignited by the fire.
2.2. HHO Gas Generator Type
HHO gas generator is composed of two basic components,
tube generator and a power source. Tube generator consists
of a tube, a pair of electrodes and electrolyte, while the
power source such as a battery. This generator works on the
principle of water electrolysis. HHO gas generators are
classified into two types as follows:

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A. Dry Cell Type
HHO gas generator is where partially of the electrode is not
submerged in electrolyte and electrolytes only fill the gaps
between the electrodes themselves as show in Fig 3.
Advantages types of dry cell HHO gas generator is the first
Electrolyzed water less, ie the only water trapped between
the cell plates. Heat generated is relatively small, due to the
circulation between the hot and cold water in the reservoir.
The electric current used is relatively smaller, because the
power is converted into heat less.
Figure 3. HHO gas Generator dry Cell type a.Generator
construction b.Electrodes area
Area of a circle on the plate electrodes immersed in water
is the area occurrence of electrolysis to produce HHO gas,
while the other area is not submerged in water and in dry
conditions. The area of occurrence of electrolysis process
approximately 60% of the total plate area and should be
limited to the o-ring or seal with a diameter of 80 mm on
each plate were used. Moreover on each plate there are two
holes with a diameter of 12 mm for HHO gas line located at
the top and at the bottom.
B. Wet Cell Type
A HHO gas generator in which all the electrodes immersed
in the electrolyte liquid in a vessel of water as show in Fig 4.
Advantages of the HHO gas generators wet cell type are
first, gas production generally more quantity and stable,
second, generator maintenance easier and third HHO
generator design manufacture easier.
Figure 4. Generator gas HHO Wet Cell type a.Generator
construction b.Electrodes area
In the wet cell type, all areas of the electrode plate area
submerged in water to the electrolysis process produces
HHO gas. So that magnitude of electrolysis area same with
an area of each plate used are dimensions of 80 mm x 80
mm.
2.3. Hho Gas Generator Performance
The performance parameters of the HHO gas generators are
as follows:
A. Generator Power Input
To produce HHO gas using the process of electrolysis of
water is needed electric energy. Therefore, it should be
known a magnitude of generator input power. Formulation
to find the input power is: P = V x I where: P = Power input
of HHO gas generator (watts) V = voltage (volts) and
I = electrical current (Ampere).
B. Hho Gas Production
The amount of production of HHO gas produced by the
HHO gas generator is measured using gas flow mater.
C. Specific Energy Input
Specific energy input is defined as the amount of energy
required to process the electrolysis of water in kjoule to
produce 1 kg of HHO gas.
D. Generator Efficiency
Generator efficiency is the ratio of useful energy to the
energy supplied on system. At the HHO generator, useful
energy is the product of the electrolysis of water in the form
of HHO gas which is obtained in the reaction of
decomposition of water (H2O): 2 H2O (l) → 2 H2 (g) + O2
(g) - 285.84. This reaction is an endothermic reaction that
requires energy enthalpy of 285.85 kJ / mol. The amount of
HHO gas mole obtained from the ideal gas equation on STP
conditions [4]. While the amount of energy supplied
calculated based on the input voltage and current to the
electrolysis process.
D. Generator Hho Temperatur
The process of electrolysis of water into HHO gas on HHO
Gas Generator influenced by the input electric current to the
electrodes and the fluid in the generator. As time goes on
generator continues to work to produce HHO gas, electric
current flows through a conductor is the greater, causing
fluid temperature rise in the HHO generator. This is caused
by the amount of electric current from the input power
source is not controlled, so most current and voltage is not
used for the electrolysis process, but only generates heat
continues to rise. So that needs to be considered to keep the
quality of HHO gas by controlling the fluid temperature
below 60 °C so as not to produce water vapor.
2.4. Pulse Width Modulation System
Pwm is an electronic circuit to control the amount of electric
current that enter equipment and to avoid excessive power
dissipation in the battery and the generator HHO. Pwm is
one of methods to control current and voltage by regulating
the percentage of pulse width to the period of a square signal
in the form of a periodic voltage applied to the motor as a
power source. Pwm signal can be constructed using analog

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methods using op-amp circuit or by using a digital method
that could be affected by the resolution of the pwm itself.
Pwm electronic circuits can be made using a 555 timer IC or
IC LM324N. Timer IC is one type of timer that has the
ability pwm controller with pulse width control features 0 to
100%. Pulse voltage of a DC power source that is used can
be regulated its duty cycle. Duty cycle is then used as a pwm
signal [5].
Mosfet drivers are needed on the use of pwm. It serves as a
power component that requires little input current and
voltage controlled. Mosfet has a driver circuit to set the
switching mosfet through the gate. Ignition mosfet to be
able to deliver the required voltage VGS greater than or equal
to the threshold voltage (minimum voltage required to
deliver mosfet) of the mosfet.
Duty cycle is the ratio of the length of time a signal in a
state of high with the length of time a signal in a state (high
+ low) as shown in Fig 5. Duty cycle is very useful in
designing tools that uses the concept of pwm. By regulating
the pulse width "ON" and "OFF" in one period of the wave
through the provision of reference signal output from a pwm
then it will get the desired duty cycle.
Figure 5. Duty cycle of pwm system
3. EXPERIMENTAL METHODS
3.1. Experimental Setup
Assembly of the HHO generator is shown in Figure 6 as
follows:
Fig 6. Assembly of HHO gas generator
In this study, the spark ignition gasoline engine used is
Sinjai engine 20 kW, four stroke two cylinder [12]. The
engine specifications are given in Table 1 as below.
Table 1. SINJAI engine specifications
Engine type SINJAI 20
Number of cylinder 2
Bore x stroke 76 x 71 mm
Displacement volume 650 cc
Compression ratio 9
Control system Programmable ECU
Fuel intake system Multi port injection
Maximum torque 57 Nm / 3000 rpm
Maximum power 20 kW/4500 rpm
Coolant system Liquid with radiator
In the experimental, the engine is modified into dual fuel
system gasoline-HHO gas engine. HHO gas fed into the
engine through the addition of shaped venturi mixer
equipment and assembly on the air intake manifold after the
air filter. Waterbrake dynamometer with power capacity 120
hp used in these experiments. The fuel consumption was
measured by the time fuel consumption per 25 cc of fuel in a
measuring glass, whereas combustion air consumption was
measured using an air flow meter. The fuel measuring glass
was fitted to Sinjai engine and it contained gasoline fuel. A
schematic diagram of experimental setup is shown in Fig. 7.
Fig. 7. Schematic diagram of the experimental setup
This engine is equipped with a programmable electronic
control unit which has the facility to adjust the suitability of
injection and ignition timings. ECU function is to control
the quantity of fuel, injection timing, ignition timing and
engine speed by receiving signals from six sensors [12].
These sensors are oxygen sensor, manifold air pressure
sensor, intake air temperature sensor, throttle position
sensor, cooled water temperature sensor and engine speed
sensor. A multi port fuel injection system with is used to
inject the gasoline fuel into intake valve area of the port to
the combustion chamber.

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ECU engine was employed to optimize air fuel ratio,
equivalence ratio and ignition timing for all engine
configurations and fuel types. For all conditions fuel/air
mixture equivalence ratio was set to 1 ~1,1, to minimize the
fuel amount necessary to obtain the maximum torque. The
ignition timing was set for minimum advance for best torque
(MBT) or limited by knock whichever occurred first[13].
A series of experiments were carried out using gasoline, and
continued with adding generator HHO gas. All fuels were
tested with variable engine speed method. The engine was
started using gasoline fuel and it was operated until it
reached the steady state condition. The engine speed, fuel
consumption, waterbrake load engine, emission parameters
such as CO, HC, CO2, O2 and exhaust temperature were
measured, while the brake power, brake specific fuel
consumption, brake mean effective pressure and brake
thermal efficiency were computed. All experiments have
been carried out at full open throttle setting.
Table 2. Fuel properties at 300 K and 1 atm
Gasoline Hidrogen
1 Chemical Formula - C8H18 H2
2 ResearchOctaneNumber,RON - 88 >130
3 Density at15
0
C kg/m3 760 0,0898
4 Minimumignitionenergy mJ 0,28 0,02
5 LowerHeatingValue MJ/kg 42,69 120
6 LaminerFlameSpeed cm/s 43 290
7 MolarWeight kg/kmol 102,5 2,016
8 StoichiometricAirfuel Ratio kg/kg 14,7 34,2
9 Flammabilitylimits(l) - 0,26-1,51 0,14-10
10 Adiabaticflame temperature K 2276 2390
11 Kinematicviscosity mm2/s 15,2 21,6
12 Autoignitiontemperature K 690 858
No Properties Unit
Fuel
4. RESULTS AND DISCUSSIONS
Based on the results of performance testing of HHO gas
generator, obtained the best performance of the HHO gas
generator is on a duty cycle of 40%, ie with a specific
energy input amounted to 33.121 MJ/kg, generator
efficiency of 20.064% and generator temperature can be
maintained below 60 0
C. More results shown in Figure 8.
HHO gas composed of hydrogen and oxygen atoms. Based
on the properties of fuel as shown in Table 2 indicate that
the hydrogen atom is small and has a very low density
compared to gasoline. Hydrogen also has an octane number
above 130 indicates a tendency to be more resistant to the
occurrence of knocking. In addition, the stoichiometric
conditions, the hydrogen-air mixture has a laminar burning
speed and adiabatic flame temperature higher than gasoline,
thus potentially resulting in emissions of nitrogen oxides
(NOx) higher.
Fig.8. Performance of HHO gas generator
With a higher calorific value and low density, hydrogen can
be used as a fuel in internal combustion engines. Based on
the performance parameters of the engine, operating with
hydrogen could reduce the bsfc. However, due to the loss of
volumetric efficiency, mainly due to high inlet temperatures,
the engine tends to produce lower power until 20%
compared to gasoline [14]. The minimum ignition energy of
a hydrogen–air mixture at atmospheric conditions is lower
than for gasoline–air mixtures. It is normally measured
using a capacitive spark discharge, and this value is
dependent on the spark gap. It is only 0.02 mJ, which is
obtained for hydrogen concentrations of 22–26% ( = 1.2–
1.5) [1]. The wide range of flammability limits, with
flammable mixtures from as lean as = 10 to as rich as
0.14 allows a wide range of engine power output
through changes in the mixture equivalence ratio. The
flammability limits widen with increasing temperature and
lower flammability limit increases with pressure, with the
upper flammability limit having complex behavior [1].
Furthermore HHO gas generator is applied on the internal
combustion engine. The engine performance tests were
carried out to study the application of HHO gas generator
type dry cell with pulse width modulation on spark ignition
Sinjai engine performance. The tests were conducted with
add HHO gas generator at intake manifold and varied of
ignition timing retarded between 12– 150
btdc. Full open
trottle test method was conducted variable engine speed test
runs from 2000 rpm to 5000 rpm, in 500 rpm engine speed
intervals with adjusting of the brake water loading switches.
Fig.9. Mapping degree of ignition timing at MBT condition

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Engine performance testing conducted in a variable speed
with full open throttle test method. To optimize the
performance of the engine, we do the settings degrees of
ignition timing. The ignition timing was set for minimum
advanced of spark ignition for best torque, MBT [13].
Mapping degree of ignition timing at MBT condition was
showed by Fig 9. The trends observed in Fig. 2 are
explained that for all variable testing indicate that the degree
of ignition timing is advanced due to the increase in speed
engine. For gasoline fuel the degree of ignition timing
gradually rises, ranging from 120
BTDC at engine speed
2000 rpm up to 180
BTDC at engine speed 5000 rpm. While
addition HHO gas has the same tendency that the degree of
the ignition timing is more advanced due to higher engine
speed but the value of degree of ignition timing retarded,
from 12 0
BTDC at engine speed 2000 rpm up to 150
BTDC
at engine speed 5000 rpm.
Fig. 10. shows the influence of addition HHO gas to engine
performance at standard and MBT ignition timing
conditions. Torque is a measure of the ability to produce a
working engine and is used to overcome the obstacles in the
way or to raise engine speed. Fig. 10 showed a tendency
that the torque starts to rise from the lower engine speed
(2000 rpm) to achieve maximum torque at a certain engine
speed (3000 ~ 3500 rpm) and further decreased at higher
engine speed (5000 rpm).
Fig.10. Brake torque at variation fuel and engine speed
According Sudarmanta et al [13], a tendency of increase in
torque with increasing engine speed until the round of 3000
~ 3500 rpm and subsequently tends to decrease with
increasing engine speed, caused by turbulent flow into the
combustion chamber which is higher as the increase in
engine speed so as to enhance the mixing of air with fuel
and fire propagation. While the tendency to decrease the
torque on the engine speed above 3500 rpm due to increased
friction losses, heat losses and incomplete combustion
process. The influence of the addition of HHO gas in
gasoline to torque, displays the tendency of increasing
engine speed, torque rise will also increase. The addition of
HHO gas on engine with standard ignition timing can
generate torque rise to an average of 2.27%, while on engine
with retarded ignition timing timing is adjusted to MBT as
graph in Figure 9 shows the increase in engine torque by an
average of 6.55%. This is because HHO gas contribute to
the process of mixing, atomization and heat release
The magnitude of engine power is proportional to the torque
that occurs, because it is related to the braking loads on the
water brake dynamometer. The greater the braking loads on
a dynamometer showed that the torque that occurs will also
increase. Figure 11 shows the effect of addition of HHO gas
to the engine power and the results showed the same trends
as the torque graph in Figure 10, the addition of HHO gas
effectively gives rise to power in the middle and upper
engine speed. The influence of the addition of HHO gas on
engine with the standard ignition timing indicates an
increase in the average engine power reached 2.76%, while
on engine with the retarded ignition timing is adjusted to
MBT as graph in Figure 9 shows the increase in engine
power by an average of 7.65%.
Fig.11.Brake power at variation fuel and engine speed
Furthermore, the parameters used to describe performance
of engine with reciprocating piston type is brake mean
effectif pressure, bmep. Bmep is a theoretical constant
pressure which, if acting on the piston during the power
stroke, will produce the same net work really developed in
one cycle. Fig. 12 shows the influence of the addition of
HHO gas to bmep.
Fig.12. Bmep at variation fuel and engine speed
Same as the trend for the torque and power, the magnitude
of bmep is proportional to the torque that occurs, because it
is related to the braking loads on the water brake
dynamometer. The greater the braking loads on a
dynamometer showed that the torque that occurs will also
increase. Figure 12 shows the effect of addition of HHO gas

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to bmep and the results showed the same trends as the
torque graph in Figure 10, the addition of HHO gas
effectively gives rise to power in the middle and upper
engine speed. The influence of the addition of HHO gas on
engine with the standard ignition timing indicates an
average increase in bmep until 2.27%, while on engine with
the retarded ignition timing is adjusted to MBT as graph in
Figure 9 shows an average increase in bmep until 6,55%.
As shown in Fig. previously, by setting the ignition timing
to follow MBT as graph in Figure 9 produces higher torque,
power and BMEP, respectively. Increased these parameters
with retarded ignition timing were caused by the presence of
HHO gas assist mixing process becomes more evenly
distributed, atomization becomes more active as well as
combustion and flame propagation becomes more quickly
and thoroughly. Besides the presence of oxygen in the HHO
gas is also effectively assists the mixing process, oxidation
and combustion, respectively [12].
The brake specific fuel consumption, bsfc illustrates the
flow rate of fuel required by the engine per unit of power
generated. Due to the heating values, LHV from hidrogen
gas is higher than gasoline (as show in Table 2),
the amount of mass that is required for the combustion
process unity generated power becomes less than that of
gasoline. The explains why bsfc HHO gas is higher than
gasoline, as shown in Fig. 13.
From Figure 13 shows that the addition of HHO gas can
reduce the magnitude of bsfc compared to gasoline fuel. The
influence of the addition of HHO gas on engine with the
standard ignition timing indicates an decrease in the average
bsfc until 7.76%, while on engine with the retarded ignition
timing is adjusted to MBT as graph in Figure 9 shows the
decrease until 22,06%.
Fig.13. Bsfc at variation fuel and engine speed
The thermal efficiency is a parameter that indicates the
magnitude of conversion of stored energy in the fuel into
the engine power produced. In generally, it is defined as the
ratio of useful energy produced by the engine with the
energy stored in fuel.
Fig.14 Thermal efficiency at variation fuel and engine speed
Thermal efficiency is influenced on the quality of the air and
fuel mixture is burned in the combustion chamber. As
shown on Fig. 14, the addition of HHO gas can increase the
magnitude of thermal efficiency compared to gasoline fuel.
The influence of the addition of HHO gas on engine with the
standard ignition timing indicates an increase in the average
thermal efficiency until 3,08%, while on engine with the
retarded ignition timing is adjusted to MBT as graph in
Figure 9 shows the increase until 15,50%.
These results indicate that the addition of HHO gas provides
a dual function, ie beside of hydrogen gas has a higher
calorific value, also the presence of oxygen gas is able to
activate the process of mixing, atomization and oxidation
that occurs, respectively that the heat release process can
occur more optimally.
5. CONCLUSIONS
Optimum performance of HHO gas generator is generated
by pwm with 40% duty cycle with parameters such as
specific energy input of 33 121 MJ/kg, generator efficiency
of 20,064% and generator temperature can be maintained
below 60 0
C.
Application of HHO gas generator in point above on
standart ignition timing Sinjai engine produce in an increase
of performance such as torque, power, BMEP and thermal
efficiency respectively of 2.27%, 2.76% and 3.05% and a
decrease of bsfc 7.76 %.
Retarded ignition timing is adjusted to MBT is able to
increase performance such as torque, power, thermal
efficiency, respectively 6.55%, 7,65%, 15,50% and a
decrease of bsfc 22,06 %.
ACKNOWLEDGEMENT
This research was part of research activities funded by the
ministry of research and technology-higher education with
laboratory research schema through the Institute's research
and community service (LPPM ) ITS for fiscal year 2015. In
this opportunity, authors would like to thank Kementerian
Ristek-Dikti RI and LPPM ITS thanks to funding that has
been given. Authors also thank to the HHO gas generator
team.

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“Influence of Bioethanol–gasoline blended fuel on
performance and emissions characteristics from port
injection Sinjai Engine 650 cc”, Journal of Applied
Mechanics and Materials Vol. 493, pp 273-280, 2014.
[13]. Sudarmanta B., Junipitoyo, B., Bachtiar, A. &
Sutantra, I.N., “Influence of the compression ratio and
ignition timing on Sinjai Engine performance with
50% bioethanol-gasoline blended fuel”, ARPN Journal
of Engineering and Applied Sciences, Volume 11, No
4, (2016).
[14]. Yamin, J.A.A., Gupta, H.N., Bansal, B.B. &
Srivastava, O.N., “Effect of combustion duration on
the performance and emission characteristics of a spark
ignition engine using hydrogen as a fuel”, International
Journal of Hydrogen Energy 25 (2000) 581-589.
BIOGRAPHIES
Bambang Sudarmanta is a lecturer in the
department of mechanical engineering,
Sepuluh Nopember Institute of technology,
ITS Indonesia. Field of research are
biofuels, combustion engineering and
power plant.
Sudjud Darsopuspito is a lecturer in the
department of mechanical engineering,
Sepuluh Nopember Institute of technology,
ITS Indonesia. Field of research are
termodynamics and heat transfer.
Djoko Sungkono is a emeritus professor in
the department of mechanical engineering,
Institute of Technology Indonesia. Field of
research are internal combustion engine.

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