CRASH
NAXJA Forum User
- Location
- Foresthill, CA
So my stroker is about 9.4 to 1 compression. Should I be using a plug with different heat range?
Discuss and advise.
CRASH
Discuss and advise.
CRASH
Higher Compression, Different Plugs?
- Thread starter CRASH
- Start date
Dr. Dyno
NAXJA Forum User
- Location
- Al Ain, UAE
I'm using stock Champion RC12LYC plugs on my 9.25:1 compression stroker but I dropped them in without gapping them. No pinging problems at all.
MrShoeBoy
NAXJA Forum User
- Location
- Cincinnati, OH
Thats a good question. I have a stroker with a 9.5 CR ratio and would like to know if there is any different power/mpg differences with a different heat range.
I am currently running the factory Champion copper replacements from NAPA.
AARON
I am currently running the factory Champion copper replacements from NAPA.
AARON
5-90
NAXJA Forum User
- Location
- Hammerspace
Let me get back to you on this one...
Unless you are having significant trouble with pinging, I don't see a reason to go with a colder plug. However, I do seem to recall there being a relationship between compression and/or boost and plug GAP, and that's the part I'd like to get back to you on. I'm assuming this is an NA stroker, no?
The slight increase in compression shouldn't cause any trouble your cooling system can't handle. If you're RENIX, it may take a little longer to notice spark knock (since the system automatically compensates,) but if it's not a problem, there's no need to fix it.
Gimme a day or two on this, just to make sure!
5-90
Unless you are having significant trouble with pinging, I don't see a reason to go with a colder plug. However, I do seem to recall there being a relationship between compression and/or boost and plug GAP, and that's the part I'd like to get back to you on. I'm assuming this is an NA stroker, no?
The slight increase in compression shouldn't cause any trouble your cooling system can't handle. If you're RENIX, it may take a little longer to notice spark knock (since the system automatically compensates,) but if it's not a problem, there's no need to fix it.
Gimme a day or two on this, just to make sure!
5-90
MrShoeBoy
NAXJA Forum User
- Location
- Cincinnati, OH
I am running the factory gap on the plugs with a MSD 6AL box and stock coil. I want to bump the gap up .010" and see what happens. I just havent had time to do this. I am hoping the MSD and larger gap can get me slightly better MPG. If I get more power, then heck ya 
AARON
AARON
I am running Autolite platinum -23's (one range colder than stock). Haven't looked at them in 23K miles - since built.
as far a increased gap goes - a Champion racing engineer told me that all you are accomplishing is lighting the fire - more spark (gap, voltage, etc) doesn't do anything. Indy cars run .018 gap and we were down to .025 in the Pro Stock motor (16 - 1 compression) to cure a high speed miss caused by .045 gap.
as far a increased gap goes - a Champion racing engineer told me that all you are accomplishing is lighting the fire - more spark (gap, voltage, etc) doesn't do anything. Indy cars run .018 gap and we were down to .025 in the Pro Stock motor (16 - 1 compression) to cure a high speed miss caused by .045 gap.
