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| What's the Highest Compression Ratio? https://slantsix.org/forum/viewtopic.php?t=38991 |
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| Author: | Greg Ondayko [ Sat Feb 13, 2010 3:16 pm ] |
| Post subject: | What's the Highest Compression Ratio? |
Now that I have your attention with that subject line, What's the Highest Comp ratio that a steel Shim Head Gasket can take? W/O boost or nitrous? Mike Jeffery Told me on the phone that the Fel pro replacement gasket is good for about 12:1 on motor alone and any higher then we need to o ring and run a copper gasket. My dart has a steel shim and runs approx. 10- 10.5:1 w/o any problems as of yet with plenty of dragstrip passes and a whole lotta street miles too. Thanks - this is more of a curiosity than anything. Greg |
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| Author: | Charrlie_S [ Sun Feb 14, 2010 6:22 am ] |
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Don't know the highest, but I have been running the shim gasket with 10-1 and nitrous without problems. The main issue, I see, with the shim gasket is availability. I have a few in stock, but when checking other sources, they are getting pricey. |
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| Author: | Kidd [ Sun Feb 14, 2010 2:47 pm ] |
| Post subject: | |
I run 12:1 and have a victor over the counter composite head gasget....we did Oring the block, but I dont have the Orings in it, because we did it w/ a felpro and the gasket failed...so far so great!! Andrew |
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| Author: | Greg Ondayko [ Sun Feb 14, 2010 3:49 pm ] |
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Quote: Don't know the highest, but I have been running the shim gasket with 10-1 and nitrous without problems. The main issue, I see, with the shim gasket is availability. I have a few in stock, but when checking other sources, they are getting pricey.
Cool Charrlie,Thanks, Kidd, I dont believe you can run a fel pro gasket with o rings - I might be wrong here but I think you can just run copper gaskets with o rings. Greg |
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| Author: | 66aCUDA [ Mon Feb 15, 2010 7:27 am ] |
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Greg If you dont install the O rings then you should be able to run a FelPro or any other composite gasket. Frank |
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| Author: | Dart270 [ Mon Feb 15, 2010 7:33 am ] |
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It is probably possible to get the o-rings to hit the fire ring on the Felpro, but that gasket's ring is not very wide. Tilley in Oz has had good luck using an o-ring on one side of a Permaseal (AU/NZ) gasket up to and a bit above 12:1 comp. I have run 11:1 comp in my motors with a standard composition gaskets and never had a problem. No o-rings. Lou |
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| Author: | maf [ Thu Apr 08, 2010 1:26 pm ] |
| Post subject: | whats the highest compression ratio: |
for what its worth forty years ago my altered t had 270lbs at cranking speed. it would blow felpro gaskets regularly . thought that i would have to copper o ring it. tried first, set of aftermarket head studs. worked great no more blown gaskets. guessing that motor was over 12:1 its been forty years. got to go to parts for sale. |
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