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Old Jul 28, 2015 | 03:57 PM
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From: Santa Fe Tx
Carb smoke or something else?
Hey folks, I have a 351m/400 and under heavy acceleration/wot it smokes, at first I chalked it up to carb smoke, I rebuilt the carb and its still there, doesn't smoke while ideling! No water in oil ect, it has true duel exaughst and it smokes out of both tail pipes.

Doesn't smell like oil, its a harsh smell can't really describe it.
 
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Old Jul 28, 2015 | 07:19 PM
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color of smoke? Is your exhaust black and real suety?
 
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Old Jul 28, 2015 | 08:08 PM
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From: Santa Fe Tx
Originally Posted by Bud Mud
color of smoke? Is your exhaust black and real suety?
White, exaughst tips arent black and sooty. My dad says its just carb smoke, has very little blow by and 60 psi oil pressure ideling
 
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Old Jul 29, 2015 | 05:33 AM
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Originally Posted by 75Three90
White, exaughst tips arent black and sooty. My dad says its just carb smoke, has very little blow by and 60 psi oil pressure ideling
White smoke is normally water,black is carb. 28yrs of drag racing if the smoke was white it was a head gasket every time. Not saying thats what yours is, im just saying.
 
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Old Jul 29, 2015 | 06:53 AM
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Yes, white is coolant. And that usually doesn't happen until the engine gets good and warm. When does yours smoke? Are you losing coolant?
 
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Old Jul 29, 2015 | 08:11 AM
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From: Santa Fe Tx
Originally Posted by Gary Lewis
Yes, white is coolant. And that usually doesn't happen until the engine gets good and warm. When does yours smoke? Are you losing coolant?
Not loosing coolant, happens any time under wot or heavy accleration, heat gauge never goes over 195
 
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Old Jul 29, 2015 | 09:38 AM
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Originally Posted by 75Three90
Not loosing coolant, happens any time under wot or heavy accleration, heat gauge never goes over 195
How heavy/thick is the smoke? You have peaked my interest.
 
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Old Jul 29, 2015 | 09:47 AM
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From: Santa Fe Tx
Originally Posted by Bud Mud
How heavy/thick is the smoke? You have peaked my interest.
It's not a fog more or less a light to medium haze and it stops as soon as you let off the throttle, no matter of its warmed up or cold. I'll try to get a video of it and upload it but I don't get good service and it takes forever for YouTube to load a video
 
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Old Jul 29, 2015 | 11:24 AM
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Then it may be an over-rich condition.
 
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Old Jul 29, 2015 | 11:28 AM
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White, acrid smoke is coolant (antifreeze) being burned in the combustion chamber.
 
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Old Jul 29, 2015 | 12:03 PM
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From: Santa Fe Tx
Originally Posted by Gary Lewis
Then it may be an over-rich condition.
That's what my dad was thinking
 
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Old Jul 29, 2015 | 05:25 PM
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Originally Posted by 75Three90
That's what my dad was thinking
If it is that then the smoke probably isn't really white. But, in small quantities it might look that way.
 
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Old Jul 29, 2015 | 07:08 PM
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From: Santa Fe Tx
Originally Posted by Gary Lewis
If it is that then the smoke probably isn't really white. But, in small quantities it might look that way.
Well I took a video but you couldn't see the smoke its more of a bluish white color
 
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Old Jul 29, 2015 | 07:29 PM
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Blue is typically oil. But it is unusual to have oil smoke only under heavy acceleration.
 
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Old Jul 29, 2015 | 08:14 PM
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From: Santa Fe Tx
Originally Posted by Gary Lewis
Blue is typically oil. But it is unusual to have oil smoke only under heavy acceleration.
Maybe valve seats? Idk its a weird situation imma try tuning the carb some more and see if it helps
 
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