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Motor smokes when hitting rev limiter ?

 
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Rbace123
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PostPosted: Sun Mar 07, 2010 8:19 pm    Post subject: Motor smokes when hitting rev limiter ? Reply with quote

I noticed when I installed my Mallory ignition box that the motor would smoke when it hit the rev limiter ( 6800 ). Smells like oil smoke to me. Motor does not smoke at any other time only when hitting rev limiter. I was checking things today and wanted to see if the rev limiter was set right and it did it again. I mean it is a good bit of smoke only after hitting the rev limit for a second or so.

What do you guys think? I know there would be unburned fuel but it kind of smells like oil to me not fuel and it happens really quick. Is there something wrong I need to look at? Motor is the new 383 I built at the end of last summer with about 1500 miles.

Thanks
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MufflerBearings69
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1968 Ford Galaxy

PostPosted: Sun Mar 07, 2010 8:24 pm    Post subject: Reply with quote

Well, we have the info of when it smokes, and what it smells like, but me, I want to know one more thing-

Color of smoke?

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Rbace123
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PostPosted: Sun Mar 07, 2010 8:28 pm    Post subject: Reply with quote

Can't really remember color but I am pretty sure it wasn't black maybe white or gray ?
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clay
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PostPosted: Sun Mar 07, 2010 9:08 pm    Post subject: Reply with quote

I've usually seen sort of a brownish or even sort of blackish puff when something hits the limiter. You need to stay off of it though, I just don't think they are really healthy for a motor - they are really just a safety thing. Either shift sooner or bump the limiter up and you should be good to go. Clay
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squeeezer
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PostPosted: Sun Mar 07, 2010 9:48 pm    Post subject: Reply with quote

were you burning the 2 parts nitrogen and 1 part oxygen???
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af2
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PostPosted: Mon Mar 08, 2010 12:58 am    Post subject: Reply with quote

I don't know how the Mallory limits the rev. The MSD kills various plugs and not all at once, so you don't get the popping you hear from some other brands.
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SMOKEmUP
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PostPosted: Mon Mar 08, 2010 1:33 pm    Post subject: Reply with quote

Is the smoke just the unburnt fuel?
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squeeezer
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PostPosted: Mon Mar 08, 2010 10:01 pm    Post subject: Reply with quote

blue smoke is the worst to figure out
could be fuel or oil

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clay
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PostPosted: Mon Mar 08, 2010 11:10 pm    Post subject: Reply with quote

Quote:
The MSD kills various plugs and not all at once, so you don't get the popping you hear from some other brands.

Well most of the time. When you hit it under boost, it seems to cause a backfire on mine - haven't figured that one out yet. That's what killed the Procharger.
Quote:
Is the smoke just the unburnt fuel?

What I've seen sometimes seems to be what I'm assuming is maybe the shock wave from the dropped cylinder knocking the thin layer of carbon that gets built up in the exhaust system loose and spitting it out the tailpipes. Clay

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