question about plenum

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Sep 23, 2007 | 12:11 AM

rolando4812

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Racer

Joined: Apr 2007

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From: Houston texas

question about plenum

i bought a used plenum and received it with black stuff inside. oil or carbon buildup. is there suppose to be anything like that in the plenum? the reason i ask is because only air has gone through there. was there something wrong with it?

Sep 23, 2007 | 01:17 AM

Sam Lam

Melting Slicks

Joined: Apr 2002

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From: St. Charles, MO Route 66 Corvette Club

The presence of black crap is "normal" inside the plenum of a L98 engine. It is caused by the evaporation of unburned fuel each time you shut down the engine. You cleaned plenum will look like this in a few months

Sep 23, 2007 | 08:13 AM

rolando4812

Thread Starter

Racer

Joined: Apr 2007

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From: Houston texas

well should i clean the crap away before i send it to get it ported?

Sep 23, 2007 | 08:55 AM

Sam Lam

Melting Slicks

Joined: Apr 2002

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From: St. Charles, MO Route 66 Corvette Club

Suggest you contact the person who will do the porting work for you and ask if it should be cleaned prior to shipping

Their standard practice may be to clean the part upon arrival.

Sep 23, 2007 | 09:00 AM

rolando4812

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Racer

Joined: Apr 2007

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From: Houston texas

good tip. thanks

Sep 23, 2007 | 09:05 AM

SuperL98

Drifting

Joined: Jun 2001

Posts: 1,701

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From: Mass Mass

Get a big can of the old fashion Gunk carb cleaner, at the local parts store.
It will remove all of that with little effort, just take it out in the backyard and spray

Sep 23, 2007 | 11:08 AM

Aardwolf

Race Director

Joined: Jun 2004

Posts: 13,939

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From: WI

I would think EGR would add more crud then unburned fuel. When I ported the plenum on mine it was VERY difficult to remove the carbon. I tried cleaners and also a wire brush, I ended up making some progress with a wire wheel on the die grinder.