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> Inside my air cleaner lid, Does anyone know what this is?
nivekdodge
post Sep 8 2025, 11:15 AM
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Hi
This is the bottom of my air cleaner lid. Anyone else get this and where’s it from? Do I need to fix it?

Kevin


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dr914@autoatlanta.com
post Sep 8 2025, 11:22 AM
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condensation blow by from not running the car to operating temperature often enough
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nivekdodge
post Sep 8 2025, 11:54 AM
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Thank's George

I'm sorry, it's not plain enough. That's oil and Bronze? from the valve guides?

Kevin
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porschetub
post Sep 8 2025, 02:08 PM
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QUOTE(nivekdodge @ Sep 9 2025, 05:15 AM) *

Hi
This is the bottom of my air cleaner lid. Anyone else get this and where’s it from? Do I need to fix it?

Kevin

Are there any heat marks on the top side ?.
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nivekdodge
post Sep 8 2025, 02:51 PM
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They’re chrome but no burn marks
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mlindner
post Sep 8 2025, 03:06 PM
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Do you have some backfiring go on. I get a little of that on mine from gass and vapors. Little each year (4000) miles, just clean with brake cleaner.
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nivekdodge
post Sep 8 2025, 04:31 PM
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It doesn’t take that long. This is two afternoon rides. It wipes off but that’s not why I’m worried
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Puebloswatcop
post Sep 9 2025, 07:33 AM
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Have you adjusted the valves lately? I would check the valve adjustments first. If it continues valve guides may be an issue.
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infraredcalvin
post Sep 9 2025, 08:05 AM
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This looks like it’s been on fire… I agree with the backfires…

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nivekdodge
post Sep 9 2025, 02:32 PM
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No just a shadow

Kevin


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PlaysWithCars
post Sep 14 2025, 06:41 PM
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Could it be reversion back through the carburetors? (small pressure waves coming back up the intake tract from exhaust pressure during overlap and/or rapid valve closure). More likely to occur on motors with an aggressive cam shaft and driving conditions where the throttle plate is open at relatively low engine speed.
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nivekdodge
post Sep 14 2025, 07:15 PM
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QUOTE(PlaysWithCars @ Sep 14 2025, 08:41 PM) *

Could it be reversion back through the carburetors? (small pressure waves coming back up the intake tract from exhaust pressure during overlap and/or rapid valve closure). More likely to occur on motors with an aggressive cam shaft and driving conditions where the throttle plate is open at relatively low engine speed.


It may be related to some of that. I have no idea what kind of cam is in there but it doesn't lope... but if we take off imediately it syutters a little till igets warm when the revs are low. so;

Saturday l let it idle for a good 10 minutes before leaving. for a 35 mile ride. Some oil and bronze but not a lot.

Sunday we left immediately and it stuttered on the way out of the plan, 23 mile ride and the build up was cosiderably more than Saturday

But what does that mean?

Kevin.
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fixer34
post Sep 14 2025, 08:48 PM
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Did you say it is 'oil and bronze', as in engine oil? is the color the same what is on the dipstick? Bronze particles or bronze colored flecks?
And you can wipe it off/clean and a couple runs on the engine and it's back?
Something very strange here...
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flxzcat
post Sep 16 2025, 06:50 PM
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Pretty strange.

Do remove that wire hanging over the air horn.

Could it be the butterflies, shafts or bushings (if used) getting chewed up? They are made of brass.

What size are the chokes?

Is the brass/bronze dust inside the barrels as well?
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nivekdodge
post Sep 16 2025, 07:36 PM
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Yes oil and some sort of gold flecks. Yes it’s in the barrels.

Kevin
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Bob L.
post Sep 16 2025, 09:35 PM
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Is it on both sides?

Perhaps running it with a clear cover, might see something.
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nivekdodge
post Sep 22 2025, 07:27 PM
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Yes it's on both sides and about the same amount

kevin
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Superhawk996
post Sep 22 2025, 08:23 PM
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https://www.hotrod.com/how-to/ctrp-1008-intake-reversion

What size Venturis are you running? The larger the Venturi - the more susceptible it is to reversion since air velocity is slow(er).
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