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Spark Plug Gaps 


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 Post subject: Spark Plug Gaps
Posted: Sun Apr 19, 2009 1:54 am 
Getting Side Ways
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Joined: 15th Apr 2009

Ride: Falcon AU

Location: Perth
WA, Australia

According to the repair manual for my Ford Falcon AU Forte 1999

It says that the correct spark plug gaps should be:

4.0L 1.0 - 1.1 mm
5.0L 1.3 - 1.4 mm
4.0L Gas 0.9 mm

Two Questions:

1. Why do spark plugs electrode gaps have to be different?

2. What is the reason why the gap should be smaller for Gas as opposed to Petrol?



What do you call a Hyundai with dual exhausts?

A wheelbarrow.

 Post subject: Re: Spark Plug Gaps
Posted: Sun Apr 19, 2009 3:15 am 
Technical Contributor
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Ride: 2.0 Turbo VW

Power: 142 rwkw

Location: Seaford State:
VIC, Australia

LPG is more dense that Fuel and requires a 'fatter stronger spark'

By closing the gap the spark is thicker and travels less.

Also as LPG burns dry, the combustion chamber gets hotter and it is best to run a longer electrode ie: colder plug.

Google sparkplugs or something Im sure there's a few hundred pages describing why there's different gaps.



Carefree, we may not be number one, but we're up there.

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