Question about DECARB

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Feb 26, 2007 | 12:59 PM

DADEO1

Thread Starter

Instructor

Joined: Sep 2005

Posts: 222

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From: Brenham Texas

Question about DECARB

This may seem a dumb question but ...

Does the decarb process seem to help with piston slap.

Mine like many is a slapper until it warms up.

I am sure I could use a decarb, just wondering.

Thanks

Feb 26, 2007 | 04:17 PM

screw991le

Race Director

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From: Redsox, Pats, Celts & Bruins !!! Redsox Nation !!!

St. Jude Donor '06-'07-'08-'09-'10-'11-'12

Nope, decarb will make it run smoother.

www.pistonslap.com

Feb 26, 2007 | 07:24 PM

TopFuelTim

Burning Brakes

Joined: Sep 2006

Posts: 985

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From: Cumming Georgia

What method do you use to decarb

I've heard people talk about Seafoam something, but I wonder what the best method to do this is?

Is it simply unplug the brake booster vacuum line and add the stuff? Is it a liquid or a spray? Does anyone have pics? Is there a specific Seafoam product to ask for?

Mine also slaps pretty hard, and I can even hear it slapping a little when the engine is warmed up. I too was wondering today if decarbing it would help lower the noise, but I think it needs it done anyway, as I am hearing some part throttle detonation, even using Texaco 93 octane.

Thanks,
Tim Glover

Feb 26, 2007 | 09:18 PM

cruisemon

Melting Slicks

Joined: May 2000

Posts: 2,498

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From: Brentwood TN

Quote:

Originally Posted by TopFuelTim

Mine also slaps pretty hard, and I can even hear it slapping a little when the engine is warmed up. I too was wondering today if decarbing it would help lower the noise, but I think it needs it done anyway, as I am hearing some part throttle detonation, even using Texaco 93 octane.

Thanks,
Tim Glover

Except to the extent decarbing will remove deposits that may cause preignition, decarbing has no effect on piston slap, a phenomenon observed normally at startup in relatively cold ambient temperature. My '98 exhibits slap for a few seconds after start up in ambient temperatures below about 35 degrees. As soon as the engine begins to warm up it goes away. Just don't romp on it hard at startup and the engine will last longer. I had a '91 that I bought with 68,000 miles on it and drove it to 104,000. The pistons slapped when I bought it and the rear end clunked on downshift (A4) as well. It was still doing both when I sold it and had never showed signs of crapping out.

Charlie

Feb 27, 2007 | 09:09 AM

DADEO1

Thread Starter

Instructor

Joined: Sep 2005

Posts: 222

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From: Brenham Texas

Quote:

Originally Posted by TopFuelTim

There are quite a few threads on this subject.
One was on yesterday in a lot of detail.
Most are using Seafoam you can get it at NAPA, Auto Zone, any auto supply should have it.
There are two types although I have only seen one.
Regular Seafoam and SeaFoam deep creep.

Take a vacum hose loose and stick the hose in the can and suck it in.
Let it sit, I would think like overnight.
Start it up and watch it smoke until clears up.
Probably a good idea to change the oil after the decarb.

Sounds simple,

Feb 27, 2007 | 06:25 PM

TopFuelTim

Burning Brakes

Joined: Sep 2006

Posts: 985

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From: Cumming Georgia

Thank you!

I didn't catch on about letting it sit overnight. Will do some more searches on Seafoam before I do this. Oil is around 80% right now, so I guess I can wait a couple of months.

Thanks,
Tim Glover

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