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Old 05-05-2003, 11:11 AM   #1 (permalink)
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Hello,

Last week I posted that I left a few shop rags in my manifold when I bolted my carb back on and fired up the engine. Most of them blew out the back but I now have 2 exhaust pipes on the passanger side that are glowing red hot in a matter of minutes (5-10) of starting up the car.

People had responded and said to post some results of some basic tests, so I thought I would.

Firstly, I ran the car again to see if the muffler was clogged but the exhaust "appears" to be equal on both sides.

Secondly, I removed the manifold and carb, but nothing there, I also peeked as far into the cylinders as possible but did not see anything obvious.

Thirdly, I ran a compression test and the cylinders seem consistent with the rest, 135-145 on both cylinders(The engine was rebuilt last year and it is still breaking in. My top readings on the other cylinders are 160.

Also, one of the effected plugs was wet with gas.

So I really don't know what to think. I thought the cheery red pipes ment that the cylinders were burning lean, so why the gas on the spark plug? And why no dropped compression readings?

I'm removing the header pipe tonight, just in case it's clogged, but I really doubt it. I don't think anything cloth could survive in that.

As a side note, I am wondering if this has been happening since the rebuild last summer, and the rag is just a coincidence? The engine has been running hot since the rebuild, but I just assumed that it was breaking in or had higher compression now.

What's the next step, taking off the head? What should I look for, or expect to see?

Thanks, Greg.
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Old 05-05-2003, 11:14 AM   #2 (permalink)
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I would think that the gas on the plug shows that that cylinder isn't firing. Did you check for spark on that cylinder?

WOuld gasoline being exhausted into the headers then mixing with hot exhaust gases cause a small combustion in the header pipes resulting it red hot headers?

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Old 05-05-2003, 11:22 AM   #3 (permalink)
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What is your timing advance @ idle? Timing too far advanced will cause headers to glow red hot.
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Old 05-05-2003, 12:01 PM   #4 (permalink)
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Could be running to lean for your setup.

It makes more sence to me that running the timing retarted would cause wet plugs and hot exhaust. The fuel is still igniting on the exhaust stroke. The fuel can not ignite all the way so it will leave fuel in the cylinders. Is the engine a dog or does it hall butt?
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Old 05-05-2003, 12:52 PM   #5 (permalink)
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When my headers turned red it was the timming being to far retarded.
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Old 05-05-2003, 01:06 PM   #6 (permalink)
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Just from reading your post, it kinda makes sense. On a standard manifold you may not see a hot spot because there's lots of mass to absord and dissapate the heat. On headers, the heat is going to concentrate. A later post in this thread stated that retarded timing also causes the problem. Sounds like the explosion is still happening when the exhaust valve open thus causing the header pipe to get hot.
If the plug is wet with gas, sounds like no spark and the potential souce of your problem.
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Old 05-05-2003, 01:13 PM   #7 (permalink)
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When a friend of mine did exactly the same thing as you, he had to pull the heads to clean everything out. You'd think that with the extreme heat that everything would just burn away, but it will leave residue that doesn't burn up. So, ultimately what is happening is that an exhaust valve is hanging open, causing the flames to travel into the headers. That is what is causing the glowing......

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Old 05-05-2003, 01:45 PM   #8 (permalink)
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since its not all cyl.. I think stuck exhaust valves would be more likely than timming, but could be a combination.. I'd pull the heads and clean them just to be sure, and then look into timming..

AJ
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Old 05-05-2003, 02:07 PM   #9 (permalink)
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I gotta disagree. Start with the simple stuff!!
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Old 05-05-2003, 03:00 PM   #10 (permalink)
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I like your answer....it seems to really fit. Question: wouldn't a sticking exhaust valve cause the compression to drop when I did the compression check?

Thanks, Greg.
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Old 05-05-2003, 03:07 PM   #11 (permalink)
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Yes.. The compression check would show a valve stuck open.. I only suggest pulling the heads cuz you are most of the way there already with the intake off and the headers comming off.. Its better to tear it all down and be sure than to not and still guessing..

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Old 05-05-2003, 03:39 PM   #12 (permalink)
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Quote:
Thirdly, I ran a compression test and the cylinders seem consistent with the rest, 135-145 on both cylinders(The engine was rebuilt last year and it is still breaking in. My top readings on the other cylinders are 160.
With 160 as the "top" number don't you guys think that the 135 is a little low?

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Old 05-05-2003, 04:28 PM   #13 (permalink)
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Quote:
Thirdly, I ran a compression test and the cylinders seem consistent with the rest, 135-145 on both cylinders(The engine was rebuilt last year and it is still breaking in. My top readings on the other cylinders are 160.
How many cylinders are we talking here... 6 or 8?? Are both headers/manifolds hot? If it's a V8... where are the high compression cylinders and where are the 16% lower compression cylinders at? Need more info please.

I'm still sticking with my opinion of retarted timing. You may have build up on the valve seats. Cotten and fuel and compression makes a good combination of crudd, (dirty rag). Pinch that in the valve seat and you just created a leak. Take the heads off and reseat the valves. 16% is getting up there especially for a fresh rebuild. It won't make it to 50,000 miles.
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Old 05-05-2003, 04:33 PM   #14 (permalink)
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You should do a follow up to the compression test which is a leak down test....rotate the engine to were the valves for the cylinder should be both closed and pump it full of air via the spark plug socket and listen for the were the air is leaking out.
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Old 05-05-2003, 04:54 PM   #15 (permalink)
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Oh... I'm bad.... that's right...... too Retarded, thats what I meant.

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