Saturday Night Racer - excessive exhuast temp

Prostock5j LMR Rookie Offline Dirt Late Models Rule! Posts: 10	excessive exhuast temp 04/19/09 at 2:24am would a cam that is running at its max rpm range cause excessive exhuast heat muffler was glowing red after 8 lap heat race? Thanks for any input need all the help i can get on this one
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lm26p LMR Rookie Offline I love YaBB 1G - SP1! Posts: 48	Re: excessive exhuast temp Reply #1 - 04/19/09 at 8:04am sounds like a lean condition,do a plug reading.
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Prostock5j LMR Rookie Offline Dirt Late Models Rule! Posts: 10	Re: excessive exhuast temp Reply #2 - 04/19/09 at 11:37am we are definately on the rich side with fuel thats why i was asking about the cam being to small for the engine. the engine stops pulling about half way down the stright away
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Andrew LMR God Offline 2006 SMS M.S. champion... more of a PB these days Posts: 1359 Camarillo	Re: excessive exhuast temp Reply #3 - 04/19/09 at 11:42am Timing can cause exhaust heat too. Too far advanced, I think, will make headers and mufflers glow red.
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Prostock5j LMR Rookie Offline Dirt Late Models Rule! Posts: 10	Re: excessive exhuast temp Reply #4 - 04/19/09 at 1:04pm we are at 32 degrees on timing
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hogracer3d LMR God Offline We bust our a$$ to kick yours-!!! Posts: 3933	Re: excessive exhuast temp Reply #5 - 04/22/09 at 6:58am Contrary to popular belief, glowing red headers are generally caused from a rich condition, not a lean one. Look for a plugged air bleed, all it takes is a piece of lint in either the high or low speed air bleed. one side or both, high or low speed?
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dirtfan21 LMR Rookie Offline Dirt Late Models Rule! Posts: 25 btown	Re: excessive exhuast temp Reply #6 - 04/22/09 at 10:55am i agree, unburned fuel is usually the cause of a glowing exaust
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sj_valley_dave LMR God Offline Love the smell of nitro in the air Posts: 1700	Re: excessive exhuast temp Reply #7 - 04/22/09 at 12:53pm Absolutely agree with the too rich condition....if you have a lean problem, you'll lose pistons before you'll get the headers to glow...LOL!
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Prostock5j

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Re: excessive exhuast temp
Reply #8 - 04/22/09 at 3:41pm

The high temp was at high speed the exhuast crosses over into 1 muffler running the hugh howe muffler and exhuast system. Thank you to all who replyed i also contacted jr motorsports their thoughts were way to rich running 74 jets at 4200 ft elevation was too much fuel and they suggested to bump timing from 32 to 36. Thanks again to all

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sj_valley_dave

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Re: excessive exhuast temp
Reply #9 - 04/22/09 at 4:30pm

Are you running a 4412? We rana similiar exhaust, 3 1/2" collector into 3" pipe into a 4" Y and a $' in and out muffler. Most of the time at an adjusted altitude between 500-1500 fett we had 72's in it. As the adjusted altitude went up we would go down to 70's or even 69's. When we went tp Pahrump with the 4 bbl, we went down 2 sizes front and rear and that was from being very close down in the San Joaquin valley. Unless you have a "Fast Burn" head, 32* is not enough timing . go with the recommended 35-36*

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Prostock5j

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Re: excessive exhuast temp
Reply #10 - 04/22/09 at 11:33pm

Yes running a 4412. Heads are oem with a little port work more of a clean up than enlarging anything. This si my first year racing up here so trying to be on the careful side with the engine. I was also told to go down slow with the jets taking several plug checks but not to be surprised if i end up around 68 on the jets. By the way bottom end is a 383 oem parts nothing fancy with this engine trying to work in the car then add the horsepower

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