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Old 01-12-2012, 03:59 PM   #1
nsxxtreme
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how hot should headers get?

Without access to a dyno yet doing a lot of tuning just by what the engine is doing and that ALDL cable sensor readings.

I have a question on how hot the headers should get. I've got stainless steel headers on my engine. If the timing is screwed they glow red. I always shut it down right away. But I have to pull the timing wire and set the base timing to 0 Degrees. That is enough time for the pipes to turn red hot.

So I have the base timing set to 0 degrees at idle. With the timing wire plugged in an the ECM in the loop the timing is about 16-18 degrees at idle. In the complete dark which is easier to see when they start to glow red the 2 center pipes start to glow. Its not a bright glow and you can only see it in the complete dark but you can seem them start to turn red. I know some people are able to tune based on exhaust gas temperatures. I'm just wondering if we have any people in here that know what EGT of sbc should be?
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Old 01-12-2012, 04:53 PM
Posted in reply to nsxxtreme's post "how hot should headers get?"
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badmix
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Might want to give some specs on the motor, like alot of specs. CID? Compression? Add-ons? Cam Specs? Rocker lift? RPM range?

A stock 305 wouldnt heat up much but a hi-po race motor will probably be running pretty good heat
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Old 01-12-2012, 05:12 PM
Posted in reply to badmix's post starting "Might want to give some specs on the..."
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Quote:
Originally Posted by badmix View Post
Might want to give some specs on the motor, like alot of specs. CID? Compression? Add-ons? Cam Specs? Rocker lift? RPM range?

A stock 305 wouldnt heat up much but a hi-po race motor will probably be running pretty good heat
383
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edelbrock 7116 manifold
lunati 60120 roller cam

So no not stock but not a race motor either.
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Old 01-12-2012, 05:20 PM
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SOmething has to be wrong there... if they get red something is off... my truck use to do that a long time ago when my bro put headders and he left the stock mufflers, i put performance exhaust and done no more red headders... they should get hot enought to burn plastic in time or burn your finger..
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Old 01-12-2012, 05:29 PM
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A timing issue is the only time I have ever seen headers turn red.
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Old 01-12-2012, 05:40 PM
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running rich and timing and they will get red but its not the end of the world.
They can still run when they are red.
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Old 01-12-2012, 05:51 PM
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Quote:
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running rich and timing and they will get red but its not the end of the world.
They can still run when they are red.
Timing I agree, this isn't a red you can see in daylight. Only at night in complete darkness. The 2 center pipes glow slightly however the 2 outer pipes do not. It could still be running a little rich because this is still just a base tune.

I was looking to see if anyone has seen documented Exhaust gas temperature readings that I could use an IR temperature reader and compare against.
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Old 01-12-2012, 05:58 PM
Posted in reply to nsxxtreme's post starting "Timing I agree, this isn't a red you..."
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If you can see it in the day worry at night night big deal other than they should all be the same. Not sure of temp.
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Old 01-12-2012, 08:40 PM
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What fuel induction? I bet it's TBI or carb based on the center two cylinders being hotter.
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Old 01-12-2012, 09:13 PM
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There are actually 3 things that can cause the headers to glow red hot, could be timing, too rich, too lean. Too lean and that creates heat, too rich and you end up with unburnt fuel igniting in the headers causing the glowing pipes.
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