Are head and cylinder gaskets compression gaskets? |
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Are head and cylinder gaskets compression gaskets? |
stevegm |
Oct 22 2016, 01:04 PM
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#81
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Advanced Member Group: Members Posts: 2,111 Joined: 14-July 14 From: North Carolina Member No.: 17,633 Region Association: South East States |
I need to remove the heads off of a newly rebuilt engine (4-cylinder) I built (never run). They have already been torqued. Are the head gaskets and gasket between the cylinder and block, compression gaskets that should be thrown away (i.e., replaced with new one) after I untorque the heads?
The head gaskets will be easy to replace. But I'd have to pull the cylinders to replace the ones between them and the block. |
ClayPerrine |
Oct 22 2016, 05:33 PM
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#82
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Life's been good to me so far..... Group: Admin Posts: 15,820 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille |
Bigger question: WHY are you using head gaskets? They should not be used in the first place. The VW tech bulletin everyone seems to refer to when this subject comes up does not apply to the 914 motors. People like Jake Raby have a machine shop that can make the cylinders fit into the heads perfectly, thus making sure they seal correctly. I don't have that ability, and the factory engineers designed them into the motor. And I suspect that those German Engineers are a lot smarter than any of us (Including Jake) when it comes to these motors. So I use them in every engine I build. And I don't have any problems with them blowing out. And you won't notice the gain more HP by increasing the compression .01%. |
Keyser Sose |
Oct 23 2016, 11:26 AM
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#83
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Member Group: Members Posts: 57 Joined: 1-July 14 From: West Member No.: 17,576 Region Association: None |
The VW tech bulletin everyone seems to refer to when this subject comes up does not apply to the 914 motors. People like Jake Raby have a machine shop that can make the cylinders fit into the heads perfectly, thus making sure they seal correctly. I don't have that ability, and the factory engineers designed them into the motor. And I suspect that those German Engineers are a lot smarter than any of us (Including Jake) when it comes to these motors. So I use them in every engine I build. And I don't have any problems with them blowing out. And you won't notice the gain more HP by increasing the compression .01%. Clay, it may be in a Porsche car but it's still a VW engine. The 1.7 and 1.8 heads and cylinders are identical but even the 2.0 heads, tweaked a bit by Porsche, didn't change the head to cylinder sealing surfaces, shape, dimensions or torque. It's still all VW. And the VW bulletin wasn't factory, it was addressed to rebuilders, so in the same situation that we are. That being said unless I was that engine's builder and knew the clearances I'd just replace the head gaskets and put it back together the way it was rather than risking too tight deck height. |
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