question about glowing headers (long)
#21
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Originally Posted by treyZ28
Exactly.
Rich = SLOOOOW burn. Add a late spark with a slow burn and you get incomplete combustion, raw fuel in the primaries and burning in the primaries.
Rich = SLOOOOW burn. Add a late spark with a slow burn and you get incomplete combustion, raw fuel in the primaries and burning in the primaries.
#22
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So your saying if I purposely stick the wrong jet in my atv, creating a lean situation, it WILL NOT glow red? Maybe you should try this? Im not saying what you are saying is wrong. But I can attest to the incorrect jetting, lean, in a carbed atv will make your header glow red. Never messed with this to the extense of glowing headers on a Fuel injected atv or vehicle. Have seen a well af/r 408 glow uncoated headers also.
Is an atv carb combustion engine any different then this motor we are talking about? Not to my knowledge. But im no where near the intelligent as many on this forum.
Is an atv carb combustion engine any different then this motor we are talking about? Not to my knowledge. But im no where near the intelligent as many on this forum.
#23
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If this helps re-enforce the issue, rich=glowing headers/exhaust manifolds, as well as misfire from weak/no spark. I remember burning a spark plug wire on one of my old camaro's and opeining the hood at night as the exhaust primary for the dead cylinder was glowing red.
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Lean mixture? WRONG! From racingarticles.com
Glowing headers mean the engine is lean: This wives’ tale is starting to lose steam, but still believed more often than not. Headers glow red for only one reason, there’s fuel burning inside. The two main reasons are a rich mixture and late ignition timing - which doesn’t give the fuel enough time to burn inside the combustion chamber. Test it for yourself, let your engine idle and crank the ignition timing back to the point where it barely runs, then get out the marshmallows.
Glowing headers mean the engine is lean: This wives’ tale is starting to lose steam, but still believed more often than not. Headers glow red for only one reason, there’s fuel burning inside. The two main reasons are a rich mixture and late ignition timing - which doesn’t give the fuel enough time to burn inside the combustion chamber. Test it for yourself, let your engine idle and crank the ignition timing back to the point where it barely runs, then get out the marshmallows.
#25
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Originally Posted by onebadrubi
So your saying if I purposely stick the wrong jet in my atv, creating a lean situation, it WILL NOT glow red? Maybe you should try this? Im not saying what you are saying is wrong. But I can attest to the incorrect jetting, lean, in a carbed atv will make your header glow red. Never messed with this to the extense of glowing headers on a Fuel injected atv or vehicle. Have seen a well af/r 408 glow uncoated headers also.
Is an atv carb combustion engine any different then this motor we are talking about? Not to my knowledge. But im no where near the intelligent as many on this forum.
Is an atv carb combustion engine any different then this motor we are talking about? Not to my knowledge. But im no where near the intelligent as many on this forum.
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Originally Posted by onebadrubi
Im not saying rich is not the reason. But lean does make a motor run hotter and can cause header glow.
Dude, common sense. COASTING at 45mph is virtually NO load. How could it be making that much heat at 10% load? The pistons would be GONE long before the headers glowed red. If the STEEL, which is thin and in ambient air is about 1000 degrees, think of what the piston is doing! Combustion temps in an OEM stock engine are above the melting point of aluminum. Think of what would happen if, at part throttle, it was burning so hot that these headers were glowing!
Lean just isn't going to make headers glow if the timing is right. You are going to burn it ALL in the engine. I know several people running very lean AFR on the street that drive hundreds of miles at a time. No problems. There just isn't enough load to make it hot.
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If you run so lean, that the extreme heat from the combustion process glows the headers red, get ready to park your truck for a while. Because you'll be busy for a while getting all the melted pieces of the piston out of the oil pan.