Compression question - 460 Ford Forum
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post #1 of 8 (permalink) Old 09-18-2012, 09:53 PM Thread Starter
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Compression question

I have ordered P51's (should be shipped Friday, thanks Jon and Cliff) and I am looking at a set of diamond pistons to go with them.

I think they are a -32 cc piston, I could be wrong on that but they show a 9.8:1 compression ratio with the P51's. My question is "do I have enough compression?"

It's a 521 stroker and I will be using a Victor intake I am shooting for about 650 hp.
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post #2 of 8 (permalink) Old 09-30-2012, 11:55 PM
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give diamond pistons a call , they took an off the shelf flat top kaase p51 piston and machined them to suit my desired compression ratio .cost me an extra $38 to change the dish to suit
9.8:1 is a little low in my opinion
i got pistons , rings , pins , locks , and the dish machines for just under $1000
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post #3 of 8 (permalink) Old 10-01-2012, 05:18 PM
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Compression ratio

Use this:

http://www.wallaceracing.com/cr_test2.php


I had a stab at your specs and came up with 10.34:1 (4.390 bore, 72cc chamber, 32cc dish, 4.3" crank, 4.400 gasket bore, .041 gasket thickness, zero deck)
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post #4 of 8 (permalink) Old 10-03-2012, 09:30 PM
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Quote:
Originally Posted by kevin316 View Post
I have ordered P51's...and I am looking at a set of diamond pistons to go with them. I think they are a -32 cc piston...they show a 9.8:1 compression ratio with the P51's. My question is "do I have enough compression?"

It's a 521 stroker and I will be using a Victor intake I am shooting for about 650 hp.
Without knowing anything about the details of your 521 engine combination, I can say with complete certainty that 650 hp is eeeeeasily attainable from a 10:1 (+/-) 521 with those heads.

Paul

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post #5 of 8 (permalink) Old 10-03-2012, 10:06 PM
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i got pistons , rings , pins , locks , and the dish machines for just under $1000
Without knowing anything about the details of your engine combination, I can say with complete certainty that....you should have called a dealer instead of ordering direct from the manufacturer.


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post #6 of 8 (permalink) Old 10-03-2012, 11:26 PM
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Without knowing anything about the details of your engine combination, I can say with complete certainty that....you should have called a dealer instead of ordering direct from the manufacturer.

Lolol Point well taken......I hope
Rob

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post #7 of 8 (permalink) Old 10-04-2012, 03:05 AM
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Without knowing anything about the details of your engine combination, I can say with complete certainty that....you should have called a dealer instead of ordering direct from the manufacturer.



why is that
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post #8 of 8 (permalink) Old 10-04-2012, 07:33 PM Thread Starter
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I didn't know anyone sold them. I thought they were only direct from Kasse.

I do understand the comment about buying from a dealer, it supports the guys that are in business selling vehicle parts. Most manufacturers don't sell them any cheaper than a dealer simply because no one would carry them if they couldn't match the manufacturers price. Quite ofter you can get them cheaper from a dealer.

Point taken.

I have a new engine builder so I just wanted to double check with the crowd.
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