plug gaps on a ZZ4..?

[shithotfast]

Any one know? Also what plug temps are people running?

[Paul.B]

shithotfast said:

Any one know? Also what plug temps are people running?

Paul - from what I remember, I think about 28-30 thou? I had mine at about 22 and opening them made a huge difference. Go too wide though and it would flat spot like hell.

Paul.B

[B1 ECC]

Don't know wether this applies( Ford Motor) with an MSD6AL I run 35 thou which would appear to work best!

[Paul.B]

B1 ECC said:

Don't know wether this applies( Ford Motor) with an MSD6AL I run 35 thou which would appear to work best!

You may be right Ian. I can't remember. Try starting at about 30 thou Paul and slowly open them up. It is worth getting them right. It makes a difference.

Paul.B

[builder]

It's based on the plug. Here are the standards, but you need to find the type of plug being used.

If using the FR5LS (stock AC Delco plug), .035 is the standard gap. If you are using the AC Delco Rapidfire, the gap is .045. If you use platinum tips (Champion and others), it's probably more like .060.

-- Scott
Reno, NV

[shithotfast]

[quote=builder]It's based on the plug. Here are the standards, but you need to find the type of plug being used.


My plugs are champion RS12YC, so be interested what gap you think? Anyone think other pulgs are "better" than these? Just bought the ones Real Steel suggested (which is where I got my engine)

[builder]

What year is your engine block? Stock deck and piston height? Different heads? What type of ignition system do you have?

That plug is a standard, copper core, resistor. It should be .035 (inches). You could probably experiment up to .045, but not much beyond I wound't think.

I am sure your engine builder knows what is needed, but I wouldn't have guessed that plug would be used on a Chevy V8 as the only Chevy listed for that plug (at the Champion site) is a 1975 2.0 litre 4-banger.

Check out Champion Spark Plugs for all of the details...

[steve_D]

Champion RC9YC as recommended by AFR.
0.045" gap.

Steve