Spark plug gap

[David McMahon]

Tonight, decided to change plugs but the new ones are approx a .7mm gap and not the .8mm gap I've seen as the correct gap (and indeed the approx gap on the old plugs)

So... Is it safe to use the .7 gap new plugs, or use the .8mm (approx) gap old plugs?

Should I get a .8mm feeler gauge and bend the new plugs to .8mm?

I read a more in-depth thread where people use bigger gaps for remaped engines.

My engine is a standard APP engine.

 

[David McMahon]

Anyone? Just want to know if my new plugs at .7mm are ok for a stock APP engine.

 

[David McMahon]

Seems I do need .8mm.

 

[Captain Cupra]

Just to clarify, you need a smaller gap with a remapped engine not bigger, to explain ill use a candle as a means of explaining, in an engine your spark plug is essentially a candle, now imagine the turbo boost entering the cylinder as wind, the greater the wind the easier the candle is blown out.

now in the case of a remapped car that wind or boost is increased so in order for the spark to be more resiliant the plug gap needs to be reduced therfore making it less likely to be retarded by the boost entering the cylinder, this is why under hard boost its sometimes possible to experience a misfire if the plug gap is not reduced.

i experimented alot with different gaps and settled on 0.028" (0.71mm) on NGK BKR7E plugs running stage 2 revo on a my ko3s cupra

Running standard map use 0.032" (0.81mm)

I love NGK BKR7E's there are a great plug, copper is the best on these engines ive tried fancy iridium and platinum 4 prong jobs but NGK coppers are the nuts and cheap enough to change once a year.

 

[David McMahon]

Running standard map use 0.032" (0.81mm)

I love NGK BKR7E's there are a great plug, copper is the best on these engines ive tried fancy iridium and platinum 4 prong jobs but NGK coppers are the nuts and cheap enough to change once a year.

Super, I'll re-gap my new NGK plugs to 0.032" ( I think I have an imperial gauge somewhere)

 

[Captain Cupra]

Are you running a standard map?


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[David McMahon]

Are you running a standard map?


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Yes, or at least I very much think so. Car is completely stock down to the mud-flaps.