Cherry Red Exhaust Pipes

[pewkerdad]

Hope someone can help!
We have put in a new 602 crate motor this season, My problem is ...I am running a motor temp of 190 degrees on 25 laps on 3/8 oval ashphalt....we have locked down the timing to 32 degrees ...we are using a 4412 2 barrel carb of course track rules... jets are 77 we are using 94 octane fuel.......we start out real strong and about 4 laps in we lose power roughly 30-40 horse....also engine rpm is 6200...... the car is a thunder car,......:smiley_601:what the heck am I not seeing , can somebody help
Thx

[nctrooper107220]

Intake leak

[streetstocker6]

You may not be running a fuel with enough quality, which may be causing detonation before the plug fires. I would run some Sunoco 100 through it and see what that does for it. Pump gas is not consistent enough for racing because they change the additives due to climate changes in different parts of the year. I have never ran crate engines but I would try to stay away from pump gas in general. Hope maybe this helped you out.

P.S. You can run 100 octane low lead gasoline from your airport and it does just as well as racing fuel and is only $4.35 a gallon, but you need to run a slightly richer jet than with normal fuel to keep from leaning out your engine.

[t39racer]

bigger jets, sounds like its running lean.

[The_Intimidator]

Av fuel is formulated to be ran in a high compression aircraft type engine.

A airplane does not pull a lot of RPM's. It basically runs like a old dump truck.
Low RPM's and lot's of torque.

As others has said, usually if you have a leaky intake manifold or a lean condition you will have a red exhaust. Also if you have a rich condition - unburned fuel in the headers you will have red hot exhaust manifolds.

Wrong timing.

Bad fuel would usually cause detonation.

Most problems with the crate motor revolves around broken rocker arms, not fuel.

I would call your local VP fuel dealer and ask them for their suggestion.

A 55 gallon drum of fuel is still cheaper then a new motor.