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Head Gaskets For NOS

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Old 12-30-2008, 02:29 PM
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ok, i just did a quick search on why a tighter quench is better. the closer the piston comes to the bottom of the head creates more turbulence, and turbulence reduces detonation
Old 12-30-2008, 02:43 PM
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Maybe true for a N/A motor.

Tight quench speeds up the burn.... on a nitrous set up we try to slow it down with cold plugs and high octane fuel.
Old 12-30-2008, 02:54 PM
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http://www.yellowbullet.com/forum/sh...ghlight=Quench

another good one.... I'm talking about serious nitrous motors not a pump gas 150 shot car.
Old 12-30-2008, 03:34 PM
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Originally Posted by ATVracr
http://www.yellowbullet.com/forum/sh...ghlight=Quench

another good one.... I'm talking about serious nitrous motors not a pump gas 150 shot car.
it makes sense. and i know your not talking about pump gas and small shots. im just trying to learn here

i wonder how this would be applied to E85, as thats what im trying to learn about and switch over too for a nitrous

there was dyno on a sbc on another forum that sprayed a 300 shot on an e85 motor and his EGTs were 1100*F. they said on motor with regular gas EGTs are usually in the 1200-1350*F and upwards of 1500*F on spray.

i wonder if you would want to run a tighter quench on a nitrous motor on E85 that burns a lot cooler.

i never knew the guys running big shots went with a much larger quench. but thanks for explaining why
Old 12-30-2008, 06:05 PM
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I forgot how thick the GM MLS gaskets are? Does anyone know right off hand?
Old 12-31-2008, 08:28 AM
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61 i think on the gm 60L gaskets.

Waynes dead on on the gaskets. we were in your guys boat a while back and my car was making alot of excess heat. after talking with some experts they told us to bring the quench to .051 and it helped alot. we also run at leact .060 bigger than the boar to get the lip of the gasket back from the heat. Tony Mamo had us do that and we have never had a head gasket fail or leak.


BTW you should never use head gasket to make or losten compression only to set quench a the optimal distance.
Old 12-31-2008, 09:34 AM
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I know the quench on my setup is in the high 50's fwiw
Old 12-31-2008, 10:04 AM
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Originally Posted by ShiznityZ28
61 i think on the gm 60L gaskets.

Waynes dead on on the gaskets. we were in your guys boat a while back and my car was making alot of excess heat. after talking with some experts they told us to bring the quench to .051 and it helped alot. we also run at leact .060 bigger than the boar to get the lip of the gasket back from the heat. Tony Mamo had us do that and we have never had a head gasket fail or leak.


BTW you should never use head gasket to make or losten compression only to set quench a the optimal distance.
exactly!
Old 12-31-2008, 08:31 PM
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Originally Posted by ShiznityZ28
61 i think on the gm 60L gaskets.

Waynes dead on on the gaskets. we were in your guys boat a while back and my car was making alot of excess heat. after talking with some experts they told us to bring the quench to .051 and it helped alot. we also run at leact .060 bigger than the boar to get the lip of the gasket back from the heat. Tony Mamo had us do that and we have never had a head gasket fail or leak.


BTW you should never use head gasket to make or losten compression only to set quench a the optimal distance.
So how do you find out how much the piston sits out of or in the bore? And i'm assuming if the block was decked and the heads were milled you have to add that in also, right? Just curious what mine is, if the gasket is .061 my block is decked .010 and the heads are milled .020, so depending on what the piston does i'm already at .031 before any other changes, right, or am I on the wrong track here?
Old 01-01-2009, 12:12 AM
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the heads being milled doesnt matter, do you have a build sheet on your shortblock? or did you put it together yourself?

all the matters is your gasket thickness and where your piston sits.
Old 01-01-2009, 09:27 AM
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Originally Posted by JDP
the heads being milled doesnt matter, do you have a build sheet on your shortblock? or did you put it together yourself?

all the matters is your gasket thickness and where your piston sits.
Me and a buddy built it, if it helps, it's an ls1 block decked .010 with a 3.900 crank, 3.907 bore, and 6.125 rods and flat tops with -2cc reliefs.
Old 01-01-2009, 10:57 AM
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Originally Posted by Loudmouth LS1
So how do you find out how much the piston sits out of or in the bore? And i'm assuming if the block was decked and the heads were milled you have to add that in also, right? Just curious what mine is, if the gasket is .061 my block is decked .010 and the heads are milled .020, so depending on what the piston does i'm already at .031 before any other changes, right, or am I on the wrong track here?
http://www.yellowbullet.com/forum/sh...=100545&page=2

Post #25 is what your looking for I think!!

doesn't running a bigger bore gasket help with the "fire ring." I've been told to run a .010 bigger gasket to help with the heat, which helps the gasket from blowing?

Last edited by BOTTLEFEDLS1Z; 01-01-2009 at 11:06 AM.
Old 01-01-2009, 11:15 AM
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Originally Posted by Loudmouth LS1
So how do you find out how much the piston sits out of or in the bore? And i'm assuming if the block was decked and the heads were milled you have to add that in also, right? Just curious what mine is, if the gasket is .061 my block is decked .010 and the heads are milled .020, so depending on what the piston does i'm already at .031 before any other changes, right, or am I on the wrong track here?
Easy way is to bring it to top dead center and measure if the piston comes out the bore.on an alum blcok they normally come out .005 to .01 due to the block expansion. iron blocks noramlly are built 0. although atv's is -.01
Old 01-01-2009, 12:31 PM
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Originally Posted by ShiznityZ28
Easy way is to bring it to top dead center and measure if the piston comes out the bore.on an alum blcok they normally come out .005 to .01 due to the block expansion. iron blocks noramlly are built 0. although atv's is -.01
Alright, I actually have the heads off the car right now cuz i'm gettin one of them fixed, so I can measure it this weekend. Should I just turn the motor over with a ratchet while watching one piston and stop when it stops moving before going back down to get tdc or is there a more scientific way, haha!
Old 01-01-2009, 12:40 PM
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im sure you can move it to TDC by turning the motor, but be carefull because the piston rocks some at TDC
Old 01-01-2009, 07:23 PM
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Actually the scientific way is with a dial indicator to measure the top most point. but rock the piston and get the high and low measurement.
Old 01-01-2009, 07:53 PM
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Stock LS9s
Old 01-03-2009, 06:19 PM
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Originally Posted by BOTTLEFEDLS1Z

doesn't running a bigger bore gasket help with the "fire ring." I've been told to run a .010 bigger gasket to help with the heat, which helps the gasket from blowing?
Can anybody answer this?
Old 01-03-2009, 06:52 PM
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Originally Posted by BOTTLEFEDLS1Z
Can anybody answer this?
in post 26, Shiz said he runs at least .060" larger to keep the gasket away from heat



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