Crank Seal?
Thread Starter
Instructor
Joined: Nov 2014
Posts: 130
Likes: 4
From: Mendon MA
Crank Seal?
So I guess my crank seal has started leaking! I have a SC on the car with a mild tune, I know that the front crank seal is a weak spot and some have put an LS3 seal in? is this a direct replacement for the stock seal?
Race Director
Joined: Jul 2007
Posts: 10,959
Likes: 2,641
From: Texas Hill Country
LS3 direct replacement, you do not need to modify it.
What tune are you running, too much timing can create knock/cylinder pressure and build too much crankcase pressure.
How much timing and how much boost?
What tune are you running, too much timing can create knock/cylinder pressure and build too much crankcase pressure.
How much timing and how much boost?
Thread Starter
Instructor
Joined: Nov 2014
Posts: 130
Likes: 4
From: Mendon MA
I just checked with the tuner he said there is 16-17 of timing with no detonation and the boost is what ever the Procharger came with my guess is 7-8 lbs
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Drifting
Joined: Jul 2005
Posts: 1,646
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That's too much timing on pump, hence the crank seal blowout. Repair it and pull timing down to several degrees. Is this 93 octane or 91???
Just bc it doesn't show detonation doesn't mean the motor wants that much timing. The "tuner" should know that!!!
I ran 16 degrees one time on a lt1 with lots of m1 meth
Just bc it doesn't show detonation doesn't mean the motor wants that much timing. The "tuner" should know that!!!
I ran 16 degrees one time on a lt1 with lots of m1 meth
Thread Starter
Instructor
Joined: Nov 2014
Posts: 130
Likes: 4
From: Mendon MA
I'm not an expert either that's why I leave it to the people who know more than me. I'm sure if it had a lot more boost than mine it could be a problem. The car only has 3800 on it and I don't go around town in boost all the time. I just wasn't sure if others had a problem with the crank seal.
Thread Starter
Instructor
Joined: Nov 2014
Posts: 130
Likes: 4
From: Mendon MA
That's too much timing on pump, hence the crank seal blowout. Repair it and pull timing down to several degrees. Is this 93 octane or 91???
Just bc it doesn't show detonation doesn't mean the motor wants that much timing. The "tuner" should know that!!!
I ran 16 degrees one time on a lt1 with lots of m1 meth
Just bc it doesn't show detonation doesn't mean the motor wants that much timing. The "tuner" should know that!!!
I ran 16 degrees one time on a lt1 with lots of m1 meth
Last edited by 2015VETTE; Dec 3, 2015 at 03:14 PM.
Melting Slicks
Joined: Jan 2011
Posts: 2,195
Likes: 19
Again, I am no expert, but on 93 from what I have read posted from tuners, I would run no more than 12 - 13 degrees of timing. Of course the AFR and everything else needs to be taken into consideration as well.
Instructor
Joined: Feb 2005
Posts: 222
Likes: 10
From: Las Vegas NV
I have mine tuned with 9 degrees of timing on 9psi boost. I use 91 octane and single nozzle meth injection. 11.9:1 AFR, Knock sensors fully enabled.
Last edited by DoubleDown; Dec 4, 2015 at 01:15 AM.
