compression and boost question with a cometics head gasket
10-14-2011, 02:41 PM
#1
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compression and boost question with a cometics head gasket i blew my head gasket out so i am going to redo my heads and use arp studs and cometics gaskets....
i can go up to a .60 gasket thickness, so i was wondering if lowering the compression would let me run any more boost? i am running 8lbs now and i have a good valve train and a thicker gasket with studs would i be good to run any more boost? or does it not work like that
thanks
i can go up to a .60 gasket thickness, so i was wondering if lowering the compression would let me run any more boost? i am running 8lbs now and i have a good valve train and a thicker gasket with studs would i be good to run any more boost? or does it not work like that
thanks
10-14-2011, 06:46 PM
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it does work like that, but with a gasket you may drop .1 or .2 at the most off your static compression ratio so you can go up to 10 lbs safely with a stock bottom end i wouldnt be hesitant to run 15 lbs with a turbo car. are you intercooled? add water meth and id run 20 lbs on a stock bottom end.
then again im ballsy, but my motor is forged and stroked i have a 10.7 compression and i run 15 lbs on a supercharger all day, but i also have water meth (80% meth) and run 93 octane. no intercooler here, maybe someday.
then again im ballsy, but my motor is forged and stroked i have a 10.7 compression and i run 15 lbs on a supercharger all day, but i also have water meth (80% meth) and run 93 octane. no intercooler here, maybe someday.
10-15-2011, 12:06 AM
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yea its intercooled.... but there is no way a stock lt1 can hold 15 lbs of boost... 8 is the limit for me right now.. 9 if i dont care about blowing it....
you crazy
you crazy
10-15-2011, 04:49 AM
#4
it does work like that, but with a gasket you may drop .1 or .2 at the most off your static compression ratio so you can go up to 10 lbs safely with a stock bottom end i wouldnt be hesitant to run 15 lbs with a turbo car. are you intercooled? add water meth and id run 20 lbs on a stock bottom end.
Just STFU and learn. You are talking just to hear yourself.
10-15-2011, 08:06 AM
#7
it does work like that, but with a gasket you may drop .1 or .2 at the most off your static compression ratio so you can go up to 10 lbs safely with a stock bottom end i wouldnt be hesitant to run 15 lbs with a turbo car. are you intercooled? add water meth and id run 20 lbs on a stock bottom end.
then again im ballsy, but my motor is forged and stroked i have a 10.7 compression and i run 15 lbs on a supercharger all day, but i also have water meth (80% meth) and run 93 octane. no intercooler here, maybe someday.
then again im ballsy, but my motor is forged and stroked i have a 10.7 compression and i run 15 lbs on a supercharger all day, but i also have water meth (80% meth) and run 93 octane. no intercooler here, maybe someday.
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10-15-2011, 08:23 AM
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ok i was just thinking for boost the studs will help hold it down under pressure... but ill stuck with arp bolts then....
i was talking with a guy and he was saying how it takes usually takes extreme heat to blow a head gasket and since i never ran hot, he thinks that i blew a hole in the head... or however you say that... cracked it?
i can see this as possible because i was running a how plug when i was gonna switch over to the nkg 6 i was just test driving it.... also do you guys think my piston rings are fine? cause im pretty sure detonation can kill them too...
im still learning about the internals of motors and all that goes with them so no hatin
i was talking with a guy and he was saying how it takes usually takes extreme heat to blow a head gasket and since i never ran hot, he thinks that i blew a hole in the head... or however you say that... cracked it?
i can see this as possible because i was running a how plug when i was gonna switch over to the nkg 6 i was just test driving it.... also do you guys think my piston rings are fine? cause im pretty sure detonation can kill them too...
im still learning about the internals of motors and all that goes with them so no hatin
10-15-2011, 01:00 PM
#9
You're better off sticking with a thinner head gasket and keeping the quench clearance (piston to head distance) down as close to .035" as possible. the tiny decrease in CR from a thicker gasket will be overshadowed by the higher tendency toward detonation you'll create with the larger quench clearance.
Tight quench creates more mixture motion, a faster more efficient burn, and therefore less need for ignition advance.
Tight quench creates more mixture motion, a faster more efficient burn, and therefore less need for ignition advance.
10-15-2011, 02:16 PM
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You're better off sticking with a thinner head gasket and keeping the quench clearance (piston to head distance) down as close to .035" as possible. the tiny decrease in CR from a thicker gasket will be overshadowed by the higher tendency toward detonation you'll create with the larger quench clearance.
Tight quench creates more mixture motion, a faster more efficient burn, and therefore less need for ignition advance.
Tight quench creates more mixture motion, a faster more efficient burn, and therefore less need for ignition advance.
10-15-2011, 05:36 PM
#11
You're better off sticking with a thinner head gasket and keeping the quench clearance (piston to head distance) down as close to .035" as possible. the tiny decrease in CR from a thicker gasket will be overshadowed by the higher tendency toward detonation you'll create with the larger quench clearance.
Tight quench creates more mixture motion, a faster more efficient burn, and therefore less need for ignition advance.
Tight quench creates more mixture motion, a faster more efficient burn, and therefore less need for ignition advance.
10-16-2011, 11:34 AM
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Tell me how I am wrong, I'm not saying I know crap about anything but a thicker headgasket will effectively decrease compression ratio making it safer for the boost he is running?
10-16-2011, 06:30 PM
#20
"stock" heads but "beefed up valves"???????????????????????
Do you mean stock castings reworked and ported or genui9nely stock castings with aftermarket valves? Ported stock castings can be a GREAT option for most builds. Putting aftermarket valves in an otherwise untouched head is just pissing money into the wind.
Do you mean stock castings reworked and ported or genui9nely stock castings with aftermarket valves? Ported stock castings can be a GREAT option for most builds. Putting aftermarket valves in an otherwise untouched head is just pissing money into the wind.