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Author Topic:   exhaust temp
Dirt Freak

Total posts: 230
posted August 04, 2002 12:41 PM
Fresh 358 sbc on gas (citgo 110 racing ), @1000 rpm idle the exhaust is 950 deg when the timming is 20 deg. If I bump it to 34deg advance the temp drops to 650 deg. Will I be safe to limit the advance to total 38 and have the engine start with so much advance in it? Plugs show a slightly rich mixture, the carb is a proven good one, I had the carb builder check it and he feels its okay. I'm new to gas engines and dont want to melt this thing down

Dirt Maniac

Total posts: 135
posted August 04, 2002 10:02 PM
What you are seeing is normal. If you light the fire earlier, it has more time to decay before the exhaust valve opens, thus a lower temperature. The motor will love that much advance, but the starter won't. Get the motor spinning good with the starter, then turn the spark on, and you will be fine. The race track is my dyno, so I usually back the timing off on a fresh engine to 35 degrees, untill I can get a good plug check, then sneak up on max timing. I hope those plugs show rich at full throttle, under load.

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