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RyGuyTooDry
 Post subject: Aussie Permaseal
PostPosted: Tue Jul 02, 2013 11:34 pm 
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Is the aussie permaseal gasket thicker than the steel shim one? Anyone used one with boost?

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Dart270
 Post subject:
PostPosted: Wed Jul 03, 2013 6:41 am 
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Permaseal is about 0.045" compressed, compared to 0.020" compressed for OEM shim steel. Boost up to 9.5 psi and 330-340 crank HP for me with Permaseal.

Lou

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RyGuyTooDry
 Post subject:
PostPosted: Thu Jul 04, 2013 6:57 am 
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How much are most copper gaskets compressed?

And thanks Dart270

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Charrlie_S
 Post subject:
PostPosted: Thu Jul 04, 2013 7:04 am 
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Copper gaskets do not really compress. They are solid. They are usually custom ordered in whatever thickness, and bore size is desired.

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RyGuyTooDry
 Post subject:
PostPosted: Fri Jul 05, 2013 7:06 am 
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Would you lose some compression from the permaseal vs the steel shim? or is the size difference so small that it is insignificant...

-Ryan

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DusterIdiot
 Post subject: Yep...
PostPosted: Fri Jul 05, 2013 7:50 am 
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Would you lose some compression from the permaseal vs the steel shim?
Remember it's volume so how much it affects your build is dependent on your target compression ratio...if 8:1 SCR with a shim gasket it's just a smidge of loss ...if you've cut the deck and head heavily to get 12:1 compression that can knock you back to 11.5:1 if you didn't factor the head gasket in...

Time to break out the calculator and determine the volume of both gaskets compressed so you can figure out your build.

-D.Idiot
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RyGuyTooDry
 Post subject:
PostPosted: Fri Jul 05, 2013 7:10 pm 
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Is there a website with the formula on it D.I.? It's stock comp right now, never been touched.

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DusterIdiot
 Post subject: What grade are you in?
PostPosted: Fri Jul 05, 2013 8:27 pm 
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This is simple geometry of a cylinder....

Area of a circle x the height = volume, then convert to CC so everything is in the same measurement.

Pi * ( radius squared) = Area of a circle

Measure compression heights for head gaskets for their volumes.
SCR is computed at swept volumes so you need the volume of the bore with piston at TDC, and at BDC....

You can also use an online compression calculator to do the same thing but vary the head gasket compression height....

-D.Idiot
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