[joedls]

Originally Posted by Vettezuki

Do you mean like a gentle de-burring of the strap or an actual rounding of the edges? Also, exactly what problem does that solve?

Sharp edges in the cumbustion chamber create hot spots and promote detonation.

[94cobra69ss396]

Originally Posted by joedls

Sharp edges in the combustion chamber create hot spots and promote detonation.

Exactly.

[BRUTAL64]

Originally Posted by Vettezuki

Well, what do you think? Click on pic for gory details. I only pulled No. 1.



Plug wires themselves are pristine, are not in contact with exhaust and have heat shields to boot. These plugs only have only about 9,000 miles them from when the motor was put together. This includes tuning period which included many gnalry AFR passes. And yes, I run a small amount of Torco, Mach Fuel Accelerator.

These were not cheap plugs, AC Delco Iridium.

So what did you find?

[Vettezuki]

Originally Posted by BRUTAL64

So what did you find?

Well, I guess that plug was toast. I'll replace them and see what happens.

[BRUTAL64]

Originally Posted by Vettezuki

Well, I guess that plug was toast. I'll replace them and see what happens.

The limit of miles on "regular" plugs (with high compression) is 6,000 to 10,000 miles. Now your fancy type plugs you have should have gone longer before breaking down.

[Vettezuki]

Originally Posted by BRUTAL64

The limit of miles on "regular" plugs (with high compression) is 6,000 to 10,000 miles. Now your fancy type plugs you have should have gone longer before breaking down.

Is that primarily because of the high combustion temps?

[BRUTAL64]

Originally Posted by Vettezuki

Is that primarily because of the high combustion temps?

Actually has to do with pressure. The higher the compression the higher the cylinder pressure the harder to jump the gap for the spark. Temp is secondary here, unless you go lean and spike the temp and melt the plugs and pistons.

[Throttle Crazy]

Originally Posted by Vettezuki

Is that plug dead and gone? In other words, should I suspect plugs as the cause of my problem?

Next question, money no object (plugs aren't all that much) what is the best choice for my application? Mid-high compression somewhere in the 11.x:1, all motor.

Give my friends Chris or Bruce over at Custom Built Motors in Rancho Cucamonga a call. They specialize in building LSX motors from mild to wild. 1700 Hp. They also do all there own installs, programming and dyno runs. If you ever need Ls parts these guys have a ton laying around. They build alot of sand car stuff but also do cars, trucks and boats.http://www.cbfunforyou.com/

[Vettezuki]

Originally Posted by Throttle Crazy

Give my friends Chris or Bruce over at Custom Built Motors in Rancho Cucamonga a call. They specialize in building LSX motors from mild to wild. 1700 Hp. They also do all there own installs, programming and dyno runs. If you ever need Ls parts these guys have a ton laying around. They build alot of sand car stuff but also do cars, trucks and boats.http://www.cbfunforyou.com/

Can they do exhaust in house? Maybe they can hook me up with some headers and install them on site when the time comes. I'll have some tricky fitment issues putting LS headers in a C3 body.

[enkeivette]

I'm with Joe, I remember reading that reddish plug is caused by the type of fuel. The fouled plugs is likely the cause of the slower acceleration.

Another advocate for the cheap Autolites, copper conducts better than platinum. Then again, platinum resists fouling better. Which might do well for you.

If your wires are burned though to the headers and are arcing, you'll feel a rougher acceleration. If you have an intake manifold leak or some sort of stuck lifter problem, the exhaust will prob sound different. From my experience.

If it feels the same just slower, and your fuel filter is not clogged, prob just bad plugs. I doubt your cats are clogged. Your motor is clean and that would happen slowly over time, not noticeably and all of a sudden.