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| Head Gasket ? https://thejdm.com/forum/viewtopic.php?f=17&t=8684 |
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| Author: | boostjunkie95 [ June 05, 2007 ] |
| Post subject: | Head Gasket ? |
Ive seen quite a few builds where people are using oversized head gaskets, usually .5mm bigger then their bore. Are there any advantages in doing this? Just curious why they wouldnt use one that is the same size as the bore. |
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| Author: | Secret Squirrel [ June 05, 2007 ] |
| Post subject: | |
using a bigger headgasket serves to purposes. 1. they had the block or head, or both machined, and the thicker HG is to compensate for that. 2. Changing HG size can vary compression ratio. So for example, a 1.2mm hg gave a 8.5:1 comp ratio and a .9mm HG gives a 8.2 compression ratio. **this is ficticious numbers** SS |
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| Author: | boostjunkie95 [ June 05, 2007 ] |
| Post subject: | |
I didnt mean the head gasket thickness, I meant the size(diameter) of the cylinder bore on the gasket, example..... using a 76mm head gasket on a block with a 75.5mm bore. |
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| Author: | Secret Squirrel [ June 05, 2007 ] |
| Post subject: | |
oh, ive never once heard anyone doing that....why would they?that would move the fire ring away from where it needs to be....s |
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| Author: | GSR-Pimp [ June 05, 2007 ] |
| Post subject: | |
i dont think there is an advantage its probly not good also watch for leaks |
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| Author: | miyagi [ June 06, 2007 ] |
| Post subject: | |
i've heard of it as well, but never did it. Always using the correct size ... never had a headgasket problem on any of my motahz |
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