Bad cats problem...

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Jun 24, 2010 | 12:02 PM

#11

Lifter583

Thread Starter

4th Gear Member

Joined: Apr 2008

Posts: 1,440

From: North Idaho

Quote:

Originally Posted by .boB

Your Redline oil could be the problem. CI oils have a lower amount of ZDDP, because that is what clogs the cats. That's a big deal with flat tappet cams in older Windsor motors. Not a problem with the mod motors.

Some Redline oils conform to CI standards, and some are race only for use in cars without cats.

I am running Schhaffer 5/50w oil...good thing to look for...but I do think the fouled plugs caused fuel burn in the cats...I am honestly happy it happened...glad to get rid of those POS...

Jun 25, 2010 | 01:35 PM

#12

Mullens

1st Gear Member

Joined: Feb 2008

Posts: 92

From:

Quote:

Originally Posted by Lifter583

I have the new high flow cats with the H-pipe installed...can really see the difference in the tach moving through the redline...it was quite a bit slower before...now I have to be careful not to bounce it off the limiter at 6800 rpm...

If I were you I'd lower that limiter. Unless you have built internals your rods will eventually go bye bye.

Jun 25, 2010 | 01:53 PM

#13

Lifter583

Thread Starter

4th Gear Member

Joined: Apr 2008

Posts: 1,440

From: North Idaho

Quote:

Originally Posted by Mullens

If I were you I'd lower that limiter. Unless you have built internals your rods will eventually go bye bye.

These hand built 5.4's wont have a problem with hitting that limiter now and them...I dont make a habit of it though...Brenspeed sets that point in their tune so the engine will run through the redline at full potential...according to my dyno results...best shift point is at 6200-6300 rpm...

Last edited by Lifter583; Jun 25, 2010 at 02:17 PM.