is quench more important than having the perfectly...
10-12-2004, 05:38 PM
#1
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is quench more important than having the perfectly... matched cam? the reason i ask is im thinkin of switching to the 224/228 cam everyone is usiong. im also thinking of pulling my heads and putting cosemtics for the perfect quench. maybe ill mill them too while the heads are off and have them port matched to the intake too will im at it.
10-12-2004, 06:11 PM
#2
Upping the compression will get you closer to where you want to be. I would not swap to a less aggressive cam with slower ramps. The F11 is a proven performer and should make more power than the XE-R lobed 224/228. If you're going to the trouble of changing head gaskets, why not just mill the heads to get your cc chamber volume where you need it? That's where your missing power is IMO.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
10-12-2004, 07:57 PM
#4
theres more to quench then just buying a cometic gasket. you have to know your deck height. and i mean actually measure yours and not go buy the standard -.008 out the hole. gm's deck height variance is 9.235 - 9.245. my quench is .035 w/ a .045 cometic gasket and pistons out the hole .010.
Quench is basically the distance from the top of the piston to the bottom of the head. You can figure it as
Headgasket Thickness(compressed) + (Block Deck Height - (Rod Length + 1/2*Stroke + Piston Compression Height))
Quench is basically the distance from the top of the piston to the bottom of the head. You can figure it as
Headgasket Thickness(compressed) + (Block Deck Height - (Rod Length + 1/2*Stroke + Piston Compression Height))
10-13-2004, 12:57 AM
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Originally Posted by jrp
theres more to quench then just buying a cometic gasket. you have to know your deck height. and i mean actually measure yours and not go buy the standard -.008 out the hole. gm's deck height variance is 9.235 - 9.245. my quench is .035 w/ a .045 cometic gasket and pistons out the hole .010.
Quench is basically the distance from the top of the piston to the bottom of the head. You can figure it as
Headgasket Thickness(compressed) + (Block Deck Height - (Rod Length + 1/2*Stroke + Piston Compression Height))
Quench is basically the distance from the top of the piston to the bottom of the head. You can figure it as
Headgasket Thickness(compressed) + (Block Deck Height - (Rod Length + 1/2*Stroke + Piston Compression Height))
10-13-2004, 01:42 AM
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The 'perfect' quench heigth can equate to more power-especially with more compression. The closer the piston comes to the head deck, the more it sort of 'squishes' the fuel charge into the chamber. You want to get as close as possible when pumping the compression way up to avoid detonation. Getting too close could lead to destruction at a high rpm, yeah, but who worries about all that garbage anyway... 
I'd shoot for it after measuring your deck heigth and before milling your heads. You're supposed to keep it between .035 and .040, but many are out of that box. A close pal is spinning his setup to 7200 with a .033 w/o the slightest problem (yet). He's @ 12.25:1 SCR. I have the same quench height with my combo and should also be turning 7200rpm (max) and am also @ 12.25 SCR. That's probably dancing on thin thread, but power is power. It's a disease...Oh, and I second on what Patrig G said. Don't downgrade the cam. You'll want the additional overlap to help your dynamic compression with the higher static.
You can measure your deck height with a dial indicator, or a depth micrometer. I found the depth mic to be more accurate. BTW, when you measure this all, to order your correct gaskets, go by your highest number-the one farthest out of the hole. That one thou difference can cause that piston to slap the head-obviously not good...
I'd shoot for it after measuring your deck heigth and before milling your heads. You're supposed to keep it between .035 and .040, but many are out of that box. A close pal is spinning his setup to 7200 with a .033 w/o the slightest problem (yet). He's @ 12.25:1 SCR. I have the same quench height with my combo and should also be turning 7200rpm (max) and am also @ 12.25 SCR. That's probably dancing on thin thread, but power is power. It's a disease...Oh, and I second on what Patrig G said. Don't downgrade the cam. You'll want the additional overlap to help your dynamic compression with the higher static.You can measure your deck height with a dial indicator, or a depth micrometer. I found the depth mic to be more accurate. BTW, when you measure this all, to order your correct gaskets, go by your highest number-the one farthest out of the hole. That one thou difference can cause that piston to slap the head-obviously not good...
Last edited by NoseUpChromeDown; 10-13-2004 at 01:48 AM.
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10-13-2004, 02:40 AM
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I've gone as tight as .027 on a steel block 3" stroke small block with carrillo rods.You guys say .033 is safe on these beer can motors thats good to know.
