Is my engine now running at normal temp at the exhaust. - Team Camaro Tech
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post #1 of 2 (permalink) Old Aug 25th, 08, 01:49 PM Thread Starter
Join Date: Jul 2007
Posts: 2
Is my engine now running at normal temp at the exhaust.

Q: Is my engine now running at normal temp at the exhaust?

Originally had EXTREMELY high temperatures at the heads and exhaust tubes. After some forum searches and advice - I have advanced the timing to a base of 18 degrees at 800 RPM to about 34 at 3000 RPM. Second I have adjusted the Mighty Demon 750 to be as rich as I can get it without a jet change. Below are my header temps in degrees at each tube 2 inches away from the flange. At the time of taking the temps the car's water temp never exceeded 170 over the course of 30 minutes.

1 (450), 3 (375), 5 (375), 7 (400)
2 (490), 4 (420), 6 (420), 8 (420)
At the collectors it is 205 (Drvr) and 220 (Pass)

At this point would you say this is fairly normal? Would you advise a jet change (I have no idea what's in the carb currently)? Asked a different way .. is the carb still potentially still the problem?

– Original 396 block and steel crank
– Dart Pro 1 Heads
– Aluminum Roller Rocker Arms
– Hydraulic Cam .050 DUR (230) ADV DUR (292) VALVE LIFT (0.544) LOBE SEP (109) LOBE OVERLAP (107 74&#176
– Weiand Xcelerator Intake
– Mallory Ignition Box
– MSD Pro-Billet Distributor
– PowerMaster Starter
– 750 Barry Grant Mighty Demon
– Holley Peformance Fuel Pump (provides 6PSI at the carb)
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post #2 of 2 (permalink) Old Aug 26th, 08, 08:59 AM
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Join Date: Jul 2008
Location: dawsonville, ga
Posts: 83
Re: Is my engine now running at normal temp at the exhaust.

High exhaust temps at idle are usually caused by lack of initial timing and/or too rich idle setting. What happens is raw fuel ends up burning in the exhaust causing the high temps. Your initial timing looks good now for what you have, although a little more may help it even more. If that is the square port Dart head it would be a little large on that engine. This would result in a lack of efficiency resulting in higher exhaust temps, although your current temps are probably about right for where you have it now. Adjust your carb for highest vacuum/rpm at idle, making it richer than what the engine wants usually will only make your exhaust temp higher.
Never change jets for idle, adjust them to wherever the engine makes the most power at WOT. The carb always gets blamed for engine problems, but it is only reacting to what it sees. Inefficient engines with low timing and/or large intake systems almost always have rich idle, high exhaust temps, hesitations, fouled spark plugs, etc. With the timing correct and the carb adjusted right you should be able to get that combination to work well.
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