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  #1  
Old 08-24-2009, 09:59 PM
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Default '73-'87 stock compression

I punched the numbers into the C/R calc and got about 7.85:1. Is that about right? I have always seen the ratio listed as 8:1...is that just a rounded figure? This is for a 10.322 deck with stock D3VE (95cc) heads, 22cc dish piston and a .041 head gasket. Do all these numbers look accurate for a stock smogger?
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Old 08-24-2009, 10:05 PM
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72' was 8.5.1 So I think it was close....
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Old 08-24-2009, 10:28 PM
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yeah you're likely on the right track. The compression ratio flat sucked in the smogger era for the 460.
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Old 08-24-2009, 10:47 PM
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Scary part is in 71' they were 10.5.1!!!!!!

Sheesh!
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Old 08-24-2009, 10:51 PM
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Quote:
Originally Posted by Cale Aronson View Post
72' was 8.5.1 So I think it was close....
Did the '72s use flat tops or did the D2VE heads have smaller chambers? or neither?
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Old 08-24-2009, 10:54 PM
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Quote:
Originally Posted by 79Bird466 View Post
I punched the numbers into the C/R calc and got about 7.85:1. Is that about right? I have always seen the ratio listed as 8:1...is that just a rounded figure? This is for a 10.322 deck with stock D3VE (95cc) heads, 22cc dish piston and a .041 head gasket. Do all these numbers look accurate for a stock smogger?
Actual real world comrpession ratio for the 1973-1986 engines is about 7.7:1, and possibly less depending on actual cylinder block deck height (which varies from block to block by several thou) and acutal combustion chamber volume (which also varies).

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Old 08-24-2009, 11:10 PM
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Paul is right.... looking at my books that is true. The 73's were about 7.5.1 in all actuallity.

Here.... this might help a little...

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Old 08-24-2009, 11:23 PM
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I think the calculator is a bit off. I just entered the specs given from that book for a '72 460 and came up with 8.06:1. I even used the high end of the chamber size range (92.9cc) ...I'm assuming they used the same pistons as '73-'87 (-22cc)
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Old 08-24-2009, 11:35 PM
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Quote:
Originally Posted by 79Bird466 View Post
I think the calculator is a bit off. I just entered the specs given from that book for a '72 460 and came up with 8.06:1. I even used the high end of the chamber size range (92.9cc) ...I'm assuming they used the same pistons as '73-'87 (-22cc)
1973-1986 heads have a chamber volume of closer to 97ccs typical, and the OEM 1973-1987 dished pistons are closer to 24cc total dish volume. Plug those numbers in and see what happens.

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Old 08-24-2009, 11:49 PM
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Quote:
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1973-1986 heads have a chamber volume of closer to 97ccs typical, and the OEM 1973-1987 dished pistons are closer to 24cc total dish volume. Plug those numbers in and see what happens.

Paul
I came up with 7.75:1 with a piston-to-deck clearance of .032 (listed in the book)

7.66:1 using .040 as a PTD clearance, which is what I have been told it is closer to.
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