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Old 09-26-2009, 12:09 AM   #1
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Default thicker headgasket

would installing a thicker head gasket help lower compression enough to run over the recomended 12psi limit. i know its the cheap way out to pistons but a thought. and if so how much higher would you boost.
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Old 09-26-2009, 12:11 AM   #2
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who put a 12psi limit on something?
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Old 09-26-2009, 12:59 AM   #3
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clubroadster lol i never believed in limits just good tunes
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Old 09-26-2009, 01:13 AM   #4
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obviously not ^ we have no info on you....... were is your sig? and location..... read the stickies noob......
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Old 09-26-2009, 01:14 AM   #5
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You have your answer.

BTW thicker hg is stupid from what I gather. Read about it.
I remember a thread where corky bell chimed in on thicker headgasket idea and said it was pretty much stupid.

Seriously man, you need to search more and not create a seperate thread for every question you have.
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Old 09-26-2009, 01:17 AM   #6
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The only limits are those set by detonation
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Old 09-26-2009, 01:24 AM   #7
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Thicker headgasket would result in poorer quench, wouldn't it?
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Old 09-26-2009, 09:21 AM   #8
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Quote:
Originally Posted by scottieboy5612 View Post
clubroadster lol i never believed in limits just good tunes
with rudimentary, stupid questions about thick-head-gaskets, how can you know enough about tuning in general to develop the "i never believed in limits just good tunes" moniker? This is your queue to tell everyone how you did XYZ 10-years ago and how we should respect you.
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Old 09-26-2009, 04:36 PM   #9
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not trying to cause a problem by asking a question? just wondering why it wouldnt help lower compression my last car was able to run more boost with a thicker head gasket because it was able to lower compression
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Old 09-26-2009, 04:38 PM   #10
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Quote:
Originally Posted by scottieboy5612 View Post
not trying to cause a problem by asking a question? just wondering why it wouldnt help lower compression my last car was able to run more boost with a thicker head gasket because it was able to lower compression
Different cars respond differently to different modifications. Who knew
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Old 09-26-2009, 04:50 PM   #11
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A thicker HG does lower your compression regardless of application. The issue is in the quench area of the combustion chamber and piston. At TDC the outside edge, exhaust and intake sides, of the CC and piston have a near contact area that pushed the combustion into the middle of the CC causing it to tumble. This reduces risk of detonation and improves combustion efficiency. When you install a thicker HG you eliminate this effect, reducing combustion efficiency.

On the flip side, because it lowers your effective CR you are able to run more boost which can make up for that loss in combustion efficiency. I think that 2 engines with the same CR, one with a thicker HG and one with dished pistons, the one with the dished pistons will be able to either run more boost before detonation or make more power at the same boost. I have no empirical data to back up this view point however.

That said, a quick and easy way to reduce CR and run more boost is a thicker HG. A more ideal way however is installing dished pistons. In direct application to our motors, you can make enough power with stock pistons to bend/break stock rods. Therefore it is a little bit dumb to install a thick HG on a b6/bp motor in order to run even more boost/hp. If your plan is to run more boost on our motors to NEED to run a thicker HG, you will also need to install forged rods. Which in this case you would be stupid to not install dished pistons at the same time, cast or forged.

I hope that helps. I rarely feel inclined to type this much for someone I don't know.
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Old 09-26-2009, 05:36 PM   #12
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i think neo's right on here. while using a thicker head gasket works great on some motors like a 2jz-ge since it's bottom end is beastly, doing it on a motor like the miatas won't really get you anywhere.
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Old 09-26-2009, 05:42 PM   #13
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Quench=Squish?
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Old 09-26-2009, 06:18 PM   #14
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scrange = grundle
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Old 09-26-2009, 06:43 PM   #15
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= taint
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Old 09-26-2009, 11:46 PM   #16
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i appreciate the writeup now i understand. thanks you
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Old 10-01-2009, 06:03 PM   #17
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Quote:
Originally Posted by paulsub View Post
Quench=Squish?
Yes. Piston-to-head clearance.

Taint.
'aint piston, 'taint head.
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Old 10-02-2009, 01:00 AM   #18
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Quote:
Originally Posted by wildo View Post
Yes. Piston-to-head clearance.

Taint.
'aint piston, 'taint head.
rofl that was actualy pretty decent
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Old 10-02-2009, 01:13 PM   #19
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Thicker headgaskets are for ------ ricers who don't know how to properly build or tune an engine, due to a lack of any understanding of the operational principles of said internal combustion engine. It's a dumbass bandaid idea to be utilized by morons. This is why it's so popular among the Honda community.

On the upside, I've heard people ask whether they could run two stock headgaskets to lower compression, and at least this question isn't THAT stupid.
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Old 10-02-2009, 01:45 PM   #20
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Quote:
Originally Posted by neogenesis2004 View Post
A thicker HG does lower your compression regardless of application. The issue is in the quench area of the combustion chamber and piston. At TDC the outside edge, exhaust and intake sides, of the CC and piston have a near contact area that pushed the combustion into the middle of the CC causing it to tumble. This reduces risk of detonation and improves combustion efficiency. When you install a thicker HG you eliminate this effect, reducing combustion efficiency.

On the flip side, because it lowers your effective CR you are able to run more boost which can make up for that loss in combustion efficiency. I think that 2 engines with the same CR, one with a thicker HG and one with dished pistons, the one with the dished pistons will be able to either run more boost before detonation or make more power at the same boost. I have no empirical data to back up this view point however.

That said, a quick and easy way to reduce CR and run more boost is a thicker HG. A more ideal way however is installing dished pistons. In direct application to our motors, you can make enough power with stock pistons to bend/break stock rods. Therefore it is a little bit dumb to install a thick HG on a b6/bp motor in order to run even more boost/hp. If your plan is to run more boost on our motors to NEED to run a thicker HG, you will also need to install forged rods. Which in this case you would be stupid to not install dished pistons at the same time, cast or forged.

I hope that helps. I rarely feel inclined to type this much for someone I don't know.
Thats ok, now someone who was just following the thread knows too...
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