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Fitting the Correct Spark
Plugs for LPG - CNG or Petrol
Check to see what spark
plugs you have fitted in your vehicle, if you have platinum or Iridium tipped
spark plugs fitted they are No good for LPG or CNG there is No such thing as
an iridium or platinum LPG spark plug! we recommend you replace your spark
plugs with Genuine LPG / CNG spark plugs > Brisk Silver Spark Plugs are
made for LPG - CNG & Petrol they have solid silver electrodes to produce
a superior spark as you can clearly see in the chart below Silver has the
highest Thermal & Electrical Conductivity where as Nickel, Platinum &
Iridium are very poor, Silver spark plugs come in two types (YS)
single electrodes for all vehicle types & The (LGS Premium) type
multi electrode type theses can only be fitted to modern vehicles with
electronic ignition systems they are not recommended for older vehicles with
ignition points or poor ignition systems, the LGS spark plugs are specially
designed by Brisk to produce incredible sparks across 2.9 mm gaps in a 360
degree firing pattern - theses are special spark plugs they cannot &
do not require any adjustment they are ready to fit.
Do Spark Plugs make a Difference?
Yes 100% - Vehicles fitted with Poor Quality spark plugs produce a weak
spark, to ignite a fuel with a weaker spark the engine requires a much richer
fuel mixture - with poor spark plugs you will use more fuel even petrol, when
running a vehicle on LPG or CNG you need a much stronger spark due to
LPG & CNG being a dry fuel it is harder to ignite than petrol so you
need a much richer fuel mixture! most vehicles are fitted with lambda control
systems like petrol injection vehicles which correct the mixture by
monitoring the exhaust emissions this can lead to a serious problem running
on LPG or CNG with weak spark plugs as un burnt LPG or CNG has an affect on
the vehicles lambda exhaust probe sensors which makes the sensors read
incorrectly (weaker) the vehicles Ecu or lambda control system detects this
& tries to correct this by increasing the fuel mixture even more although
the system now thinks the mixture is correct is Not it is incorrect the
engine is actually running far to Rich not only is this decreasing your fuel
economy but also increasing the exhaust emissions CO & HC no longer a
green conversion in some tested we have found the emissions to be much higher
than petrol emissions & failed MOT's, this also has an increased affect
on the engine & exhaust temperature which can seriously damage the
catalytic converter due to overheating.
Common Symptoms found
with Weak Spark Plugs
Poor Fuel Economy, Misfires, Poor idle, Stalling, Hesitation & Jerking
under load, Less Power, Poor Performance in some cases undrivable
on Lpg or Cng, Back fires, Engine management light coming on, Limp home mode,
Exhaust system overheating, Lambda sensor damage, Catalytic converter damage,
etc..
Spark Plug Gaps for LPG & CNG
when fitting Brisk Single
Silver Electrode (YS) spark plugs it is recommended to set the spark
plug gaps to the manufactures recommended gap as for Petrol unless otherwise
listed for your model like (DR15YS-9) -9 being the recommended gap = 0.9 mm
etc… if the gap is not listed then use the manufactures recommended on some
vehicles with spark monitoring try reducing the spark plug manufactures gap
by 0.1 mm to compensate for the dryer fuel - The (LGS) type
spark plugs are specially designed spark plugs which produce incredible
sparks across large gaps like 2.9 mm theses cannot & do not require any
adjustment they are ready to fit.
Economy & Customer Feed Back on LPG , CNG & Petrol
Please Note: Fuel Economy
on any fuel is very difficult to calculate as we all drive differently,
all have different loads, all use different equipment & tuning of the
systems, when fitting the New spark plugs the system should be retuned as
most have be setup rich to work on the old type spark plugs, etc.. if
you have tuning equipment you can do your own calculations by comparing the
original tuning map to the new map tuning with the new plugs fitted, or by
monitoring your fuel figures prior to fitting & then after, I always like
to receive customer feedback of there test results, etc...!
Feed back from customer tests the results = on LPG increase in economy from 5
to 30% a few claiming more! - on Petrol up to 10% - Performance
increase up to 5% - Noticeable while driving most customers say they have
noticed the difference in driving the vehicle saying it is more crisp
& responsive with better fuel economy, customers with prior problems like
hesitation, jerking, very poor economy caused by poor spark plug ignition
have found the plugs solved most problems & after retuning the
system to use the correct mixture, etc... Motor cyclist noticed the
difference in power & power band smoothness as well as a slight increase
in fuel economy, etc...
But note: this does not mean you will get an increase or solve any of you
systems problems as many other factures must be taken into consideration
& account like the increase in fuel economy can be used as power &
performance depending on how you drive! plus any
Vehicles faults with the petrol or LPG system/s & Poor tuning,
etc...
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The following Tests Mapping Charts are photos of the tuning done on a Toyota
Amazon 4.7i V8 fitted with the Vogas gas injection system fitted with split
fuel capability.
The First Chart (left)
fitted with Original Iridium spark plugs the results = very poor economy on
LPG, System had use split fuel to inject 30% petrol under load to stop
misfires juddering due to poor ignition of the fuel
The Second Chart (middle)
fitted with Standard Copper spark plugs the results = an improvement in
economy & split fuel reduced to inject only 15% petrol under very hard
load
The Final Chart (right)
Fitted with Brisk DOR15LGS Premium Silver spark plugs the results = increase
in fuel economy by other 30% compared to Iridium spark plugs, split fuel turn
off running 100% LPG, no hesitation, no misfires or juddering, map greatly
reduced.
Tests showed the (YS) Spark Plugs produced
nearly the same Fuel Economy Results as that of the LGS Premium Spark Plugs. But
the (LGS) do out perform the (YS) in performance, etc...
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Thermal & Electrical Conductivity of Spark Plugs the
Best being Silver!
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Spark
Plug
Centre Electrode
Material
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Thermal
Conductivity
(M•K)
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Electrical
Conductivity
MS/m
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Spark
Plug
Expected Life
(Miles)
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Silver
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407
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66
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25/30,000
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Copper
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384
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57
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25/30,000
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Gold
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310
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45
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unknown
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Iridium
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147
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18
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90,000
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Platinum
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70
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10
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90,000
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Nickel
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59
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10
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10/20,000
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