CR with Aussie heads
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Junior User
Joined: Nov 2007
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CR with Aussie heads
I'm officially beat. After plugging this info into three different calculators, sifting through (I don't remember how many) charts with "definitive" information, I still can't get a precise estimate of my final CR.
I'm using Aussie 351 2V closed chamber heads (which I believe have 62cc combustion chambers, despite listings putting them anywhere between 59cc and 65cc), and a set of Sealed Power forged 0.30 over pistons. These are listed as "0.135 dish, giving a CR of 8.33 with the stock 76.2cc combustion chamber head."
Everything else on the engine is stock. Fel-pro cork head gaskets (I don't know the exact thickness, but keep plugging in .040, as that seems about average). No machining work done.
My final CR range, based on what I've been plugging the info into, has been between 9.2 and 10.51. I'm not kidding.
Any guesses?
I'm using Aussie 351 2V closed chamber heads (which I believe have 62cc combustion chambers, despite listings putting them anywhere between 59cc and 65cc), and a set of Sealed Power forged 0.30 over pistons. These are listed as "0.135 dish, giving a CR of 8.33 with the stock 76.2cc combustion chamber head."
Everything else on the engine is stock. Fel-pro cork head gaskets (I don't know the exact thickness, but keep plugging in .040, as that seems about average). No machining work done.
My final CR range, based on what I've been plugging the info into, has been between 9.2 and 10.51. I'm not kidding.
Any guesses?
Laughing Gas
Joined: Nov 2002
Posts: 1,198
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From: Fairmont
We have a simple CR chart for our pistons, this may help a little.
http://www.tmeyerinc.com/pistoncompare.html
http://www.tmeyerinc.com/pistoncompare.html
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Junior User
Joined: Nov 2007
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Tim,
Thanks for the reply. Since the heads are TMI Aussie's, maybe you can shed a little light on the problem.
I don't have the exact combustion chamber size for the heads - your site says 60cc.
The pistons are Federal Mogul/Sealed Power forged L2414 's, 0.30 over. This looks to be a stock replacement piston profile. Do you know where I'll end up with the static CR?
Thanks for the reply. Since the heads are TMI Aussie's, maybe you can shed a little light on the problem.
I don't have the exact combustion chamber size for the heads - your site says 60cc.
The pistons are Federal Mogul/Sealed Power forged L2414 's, 0.30 over. This looks to be a stock replacement piston profile. Do you know where I'll end up with the static CR?
Posting Guru
Joined: Jul 2007
Posts: 1,355
Likes: 1
and the rest of the engine is stock? you should check your rods if you´re reving it that high, Im planning on the same thing and got some arp bolt for my rods...
Last edited by hollenjoe; Jan 27, 2008 at 07:15 AM.
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