hockey8787 - not wound out that much? No tach!

 

rounder - last tank was Valero, normally do Chevron. I haven't seen a connection to the brand, only the temperature

 

Azgunner - no timing adjustment. I always run 91-93. Good point on punching it - normally only does it when I am really winding it out in 4th or 5th and it's hot.

 

Good troubleshooting hints all, appreciate it. Wondering if detonation is because of extreme heat and if stock main jet, a lean condition. NEVER detonates at any speed if the temps are cooler.

 

Damn, what a P.I.T.A. Feels like a morse code message.

 

Since the only time its happening is when its very hot out, I would tend to think its running a little lean.&nbsp\\; I would try richening it up a bit and see how it reacts.&nbsp\\; As was pointed out, carb adjustments are a happy medium.
&nbsp\\;
Respects,
Ed

 

good luck

 

My thoughts exactly, just wanted to validate my thinking. Thanks Ed - will try one size larger main.

Paul

 

I'm not sure what size your slow jet is.......just to give you an idea of what I'm running...

Main 195&nbsp\\;&nbsp\\; Slow 48&nbsp\\; Screaming Eagle AC with V&amp\\;H Short Shots.
&nbsp\\;
This is for the Chicago area, temps typically 80's&nbsp\\; although sometimes the low 90's

Respects,
Ed

 

Slow jet is a 46 and I raised the needle up .050 with 2 #4 washers. Your numbers are a good guide. Thanks again.