Compression ratio on my setup

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Compression ratio on my setup

Post  DieseLife on April 5th 2015, 8:17 pm

I have received several different answers and I want this put to rest. I have a 1992 ford efi 460 I'm putting d3ve heads on. What is my CR?

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Re: Compression ratio on my setup

Post  dfree383 on April 5th 2015, 8:39 pm

Around 8:1
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Re: Compression ratio on my setup

Post  DieseLife on April 5th 2015, 8:48 pm

I've heard 8.7 and 9 and mid 9's lol

I'm trying to select a cam and impeller for my 18' Taylor jet boat I'm restoring

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Re: Compression ratio on my setup

Post  dfree383 on April 5th 2015, 9:40 pm

Factory is about 7.5 with most d3 heads and the non EFI pistons, EFI pistons have a slightly smaller dish
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Re: Compression ratio on my setup

Post  supervel45 on April 5th 2015, 9:41 pm

http://wallaceracing.com/cr_test2.php                                                                                                                                                              I came up with 8.8/1 CR with a 7cc dish ( which 1992 is said to have ) .030 in the hole with a 95cc chamber .041" gasket thickness.

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Re: Compression ratio on my setup

Post  DieseLife on April 5th 2015, 10:15 pm

i did too. Confirmed my deck height from piston is .030, going to have to get a thinner head gasket though. Guess the guy gave me the wrong one it measures .05 not the .041 i wanted. Thanks fellas just wanted to reassure my calculations were correct

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Re: Compression ratio on my setup

Post  DieseLife on April 5th 2015, 10:19 pm

What did you use for the combustion chamber cc?

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Re: Compression ratio on my setup

Post  DieseLife on April 5th 2015, 10:23 pm

actually i lied i got 9:1

4.36 bore (stock)
3.85 stroke
4.5 HG bore diameter
.041 HG
92cc
-7cc dish
.030 deck height

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Re: Compression ratio on my setup

Post  supervel45 on April 5th 2015, 10:35 pm

I used 95cc for the head chamber size, 4.40" for the gasket with .041" thickness .030 for deck height or in the hole. Came out to 8.88 CR.

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