Quench & Fi eng
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From: Kitchener, Ontario
Quench & Fi eng Is quench a BIG thing when it comes to Fi engs, What everyone in telling me is you want quench to be in the .030-.040 range. When you hit this quench this is the "pefect" burn, What i am trying to fig out is if i leave the piston ion the hole .010 for the next few rebuilds this will give me a total quench of .050 . Is this that big of a deal....
Quench will help reduce the tendency to detonate. Discussions in the past have usually ended up w/ the general opinion of .050 to .040
Don't for get to factor in your gasket thickness.
.010 in the hole with a .050 gasket is .060 quench height.
Don't for get to factor in your gasket thickness.
.010 in the hole with a .050 gasket is .060 quench height.
Originally Posted by y2khawk
It will allow you to run more advance or less octane, and have a higher knock limit.
simple terms, you can get more power out of it before it detonates.
simple terms, you can get more power out of it before it detonates.
How much more power...Harlan?? I want to see if it's worth it for me to cut my deck or not. To get my quench right, of course.
Just goofing around, no need to answer. You know it all depends on the setup.
Hell, even the OE's find the knock limit on a given engine combo by trial and error. With actual human ears listening to an amplified and filtered signal from the knock sensors on the motor itself.
But as an example of what some spark advance can get you, 2 degrees across the RPM band gained me 3 MPH in the 1/8th at only 22 psi No other changes 
Hell, even the OE's find the knock limit on a given engine combo by trial and error. With actual human ears listening to an amplified and filtered signal from the knock sensors on the motor itself.
But as an example of what some spark advance can get you, 2 degrees across the RPM band gained me 3 MPH in the 1/8th at only 22 psi
No other changes
Originally Posted by Chris@AP-Engineering
How much more power...Harlan?? I want to see if it's worth it for me to cut my deck or not. To get my quench right, of course. Just goofing around, no need to answer.
Just goofing around, no need to answer.Cut them down and instead of using bolts, just weld the heads on! Bolts don't work for you anyways, they just seem to keep stretching and then....well you know the outcome
JOKING OF COURSE!!!
Stenod
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From: Kitchener, Ontario
Originally Posted by y2khawk
It will allow you to run more advance or less octane, and have a higher knock limit.
simple terms, you can get more power out of it before it detonates.
simple terms, you can get more power out of it before it detonates.
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Harlan, a nice addition to that article would have been to add timing until it detontated, record power output. Swap to the thinner gaskets, and do the same, giving a tighter quench, they should have been able to add timing and pulled out a little more power. Of course....maybe we can get one of the sponsors here to do this same test on an LS1????
Probably true. But you know magazines
Gotta watch things like that though, our engines seem to have MBT just about at the knock limit (make the most power just before detonation). But alot of the fast burn 4 valve stuff in the smaller 4 cylinders seem to make MBT before they hit detonation. Sparking beyond MBT actually reduces torque output, putting the peak cylinder pressures past the ideal point in the engine cycle.
Just gets back to the fact that every setup is different
Gotta watch things like that though, our engines seem to have MBT just about at the knock limit (make the most power just before detonation). But alot of the fast burn 4 valve stuff in the smaller 4 cylinders seem to make MBT before they hit detonation. Sparking beyond MBT actually reduces torque output, putting the peak cylinder pressures past the ideal point in the engine cycle.
Just gets back to the fact that every setup is different
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From: Centrifugal City
How do you adjust quench really?
I asked MTI for a low quench height like .040 but how do they set the deck and out of the hole? Is it even adjustable?
Back in the day Pecos said he would do it, but god knows if he did. Or was even still there when my Motor went out the door.
I asked MTI for a low quench height like .040 but how do they set the deck and out of the hole? Is it even adjustable?
Back in the day Pecos said he would do it, but god knows if he did. Or was even still there when my Motor went out the door.
Originally Posted by STENOD
Cut them down and instead of using bolts, just weld the heads on! Bolts don't work for you anyways, they just seem to keep stretching and then....well you know the outcome
JOKING OF COURSE!!!
Stenod
JOKING OF COURSE!!!
Stenod
Originally Posted by MelloYellow
How do you adjust quench really?
I asked MTI for a low quench height like .040 but how do they set the deck and out of the hole? Is it even adjustable?
I asked MTI for a low quench height like .040 but how do they set the deck and out of the hole? Is it even adjustable?
