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Thread: Reccomended spark plug gap?

  
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    mattcoupturbo's Avatar
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    Reccomended spark plug gap?

    In my Z20 LET i've currently got NGK Iridium BKR6EIX, took them out today when investigating something, my gaps seemed different on them so need to put them all the same, but was wondering what gap i needed, or indeed if there are better spark plugs for my particular engine. It should be about 245 bhp and 267 lbs of torque if that helps, lightly tuned with useual bolt on extras and eds phase 1 map. Cheers.

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    Mark T's Avatar
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    The standard plugs are factory set twin electrode plugs.

    [code] PLUG, ASSY., SPARK (FLR8LDCU) (BOSCH 0242229626) (OPEL) Z18XEL, Z20LET 9195109 12 14 000 4 [/code]
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    i had 1.1mm on mine and it popped like mad(290+bhp) stuck .8mm ones in and all fine.
    Audi B5 RS4 Quattro 451bhp. 479lb/ft

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    0.8 is correct gap according to manual and haynes.

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    These arn't standard plugs guys so haynes manual won't apply really, these plugs have a standard gap of 7.5mm but i have been told 0.6 mm would be good, might well do this later, just off to get some feeler guages from halfrauds in a few min.

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    Enkidu's Avatar
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    You want as bigger gap as you can get away with really, standard map 1.1mm is fine.. 1.1 may work with a stage 1 car but it could also give problems..

    Remember you can damage the electrode if you enlarge the gap.....

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    Matt, I reckon 7.5mm might be a little big - I'd stick at .75 myself!
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    Miles16v's Avatar
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    Quote Originally Posted by Enkidu
    You want as bigger gap as you can get away with really, standard map 1.1mm is fine.. 1.1 may work with a stage 1 car but it could also give problems..

    Remember you can damage the electrode if you enlarge the gap.....
    As said.

    Suck it and see, if it runs fine with 1.1mm then leave it, if it misfires then knock it down a bit and try again.

    The igntion system on these must be good, I had to run about 0.57mm on my old LET!

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    Steve's Avatar
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    Running 280 bhp PH3 I can get away with 0.9mm gap, nothing more. Best to buy 0.8mm and open them a touch, or just leave them as they are. 1.1mm on a stocker is great, runs much smoother

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    Im not sure that is the right heat range or designation. I use NGK BCPR 7EIX and the car is as smooth as butter. Give em a try. 1.0mm gap, if you run higher than 1.2 bar or gas,then close the gap to 0.8mm.

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