High Compression VS Low Compression Opinions
- Thread starter Mike T
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my most recent motor...i had these on a shelf for at least 15 years....TRW +30 ...we had no stockers on hand to compare but the dish looks shallow to me? only pic i have...motor buttoned up .Head was milled for a second time as well.
Mike T
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Just found measurements from the first build 8 years ago and discovered with 9441's it was @7.5:1
Mike T
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Oh my Earl oh ok
Mike T
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He said any CH you ask for is available
Mike T
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Surprised he hasn't come back with all of the details
Post #62 mentioned the dish looks smaller. He already has the pistons. I'm aware pistons are available with just about any detail that can be thought of.
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Mike T
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Was playing around on one last night. Not as elaborate...Didn't account for top ring location.
Mike T
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I believe that the old TRWs were superseded by the Speed Pros? The Speed Pro has a 25cc dish with a 1.825 compression height. Hopefully someone could confirm this.
Mike T
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For what it's worth, the compression on the previous build was ~ 7.68:1. w/Cal tuning to 610 whp. w/a 71GTQ. The new build is w/9.5:1,that will need to be tested. The old combo was mild mannered until you engaged the turbo. Looking for better response on the low end w/the higher cr. I will adjust my sig to better reflect the builds.
For what it's worth, the compression on the previous build was ~ 7.68:1. w/Cal tuning to 610 whp. w/a 71GTQ. The new build is w/9.5:1,that will need to be tested. The old combo was mild mannered until you engaged the turbo. Looking for better response on the low end w/the higher cr. I will adjust my sig to better reflect the builds.
Mike T
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Mike T
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At that level of squeeze everything gets very critical......wouldn't reducing the dish another 5cc take it over 11.5:1?
I didn't calculate that out. Going on stock block and won't be able to pull enough timing without hurting power and throwing a lot of heat in the ex valve with 11.5. I think it's 10.38:1 with a .027" gasket if I feel the need
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Mike T
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Did the math on the .027s too . Looks like your block has been decked and for the pistons to still be .010 in the hole you must have change the CH as well?
Definitely not a pig, that is at the 21#s of boost for street duty. It was just a little lazy w/o the turbo kicking in.
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