[charlie66]

When you say AFR was lean , what was it? Whats your timing at 30 psi?

[johnta1]

Thoughts?

I would go methanol!

No getting hot, or too much CR. More power.

[RAIV-Z]

Originally Posted by johnta1

I would go methanol!

No getting hot, or too much CR. More power.

Methanol, sometime in the future when we decide to drop weight. I'd like to figure this out before switching fuel.


CR is 10:1.


Another theory, valves hanging open/not sealed? We were having issues with lash going away.

[RAIV-Z]

Originally Posted by charlie66

When you say AFR was lean , what was it? Whats your timing at 30 psi?

Let me clarify the lean comment. It was lean at idle after starting it up after sitting for about a week.


AFR during a run was 11.9 to 12.2
Timing at 30lb was peak 27 degrees

[charlie66]

27* is a lot of timing for 30psi . Didnt they move the plug over to in front of the exhaust valve an give this head a heart shaped chamber? Thats a real efficient chamber . I have the new Edelbrock head with all that done to it and @30psi it only wants 18*. Something to try would be taking some timing out and richening it up a bit more . What are the egt's at 30 psi with 27*?

Originally Posted by RAIV-Z

Let me clarify the lean comment. It was lean at idle after starting it up after sitting for about a week.


AFR during a run was 11.9 to 12.2
Timing at 30lb was peak 27 degrees

[RAIV-Z]

Originally Posted by charlie66

27* is a lot of timing for 30psi . Didnt they move the plug over to in front of the exhaust valve an give this head a heart shaped chamber? Thats a real efficient chamber . I have the new Edelbrock head with all that done to it and @30psi it only wants 18*. Something to try would be taking some timing out and richening it up a bit more . What are the egt's at 30 psi with 27*?

The chambers are heart shaped. No EGTs yet. When we get it back together, we'll pull a bunch of timing out and then ramp in back in slowly again.