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Change in compression with change in head gasket
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DRR Sportsman
Picture of NEMO963
posted
moving to a larger blower so going from a MLS style gasket to a copper with o-ringed block/heads. I’m currently at 10.6:1 compression running a 4.584 bore .053 compressed MLS gasket with a 14.50 cc compressed volume. The copper gaskets come in a 4.57 bore .050 thick (13.795 cc) or .060 thick (17.106 cc) compressed. Assuming the .050 was the way to go just not sure how much that raises my compression...didn’t know if there was a formula to figure it out. On a big block Chevy with 4.525 bore and 4.25 stroke.


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Posts: 274 | Location: Firehouse 10 Wichita Ks | Registered: February 15, 2005Reply With QuoteReport This Post
DRR Trophy
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If you go to eagle rods website, on the right side they have a calculator to put your numbers in to get the compression and can change them to find diff changes for effect
 
Posts: 36 | Location: Delaware | Registered: March 14, 2011Reply With QuoteReport This Post
DRR S/Pro
Picture of "The Bender"
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A .003 thinner gasket won't change CR enough to make a difference. IMO you need a little more CR anyways. FYI mine CR is 11.7:1


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Posts: 2398 | Location: Yes | Registered: July 08, 2009Reply With QuoteReport This Post
DRR Sportsman
Picture of CURTIS REED
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quote:
Originally posted by NEMO963:
moving to a larger blower so going from a MLS style gasket to a copper with o-ringed block/heads. I’m currently at 10.6:1 compression running a 4.584 bore .053 compressed MLS gasket with a 14.50 cc compressed volume. The copper gaskets come in a 4.57 bore .050 thick (13.795 cc) or .060 thick (17.106 cc) compressed. Assuming the .050 was the way to go just not sure how much that raises my compression...didn’t know if there was a formula to figure it out. On a big block Chevy with 4.525 bore and 4.25 stroke.


Calculators are everywhere

http://users.erols.com/srweiss/calccr.htm


2017 Osage Casinos Tulsa Raceway Park No-Box Champion
 
Posts: 719 | Location: KIEFER, OK. | Registered: August 17, 2007Reply With QuoteReport This Post
DRR S/Pro
Picture of wideopen231
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I have always used formula bore/2 squared x 51.48 x depth to get cc's. If you know swept volume you can use it for compression same just add volume to above and divide total by volume number. 4.310 /2 x 51.48 x stroke 4.5 gives you 1076 + 90 cc's = 1166 /90 =12.95:1.Only works if you know total cylinder or swept volume.
.010 change in gasket 2.7 cc's so .003 less than .9 cc's
With Hemi just fill cylinder with block leveled and fill to plug hole,not so easy with bbc.At least one thing easier.LOL


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Posts: 1062 | Location: Greensboro NC | Registered: May 24, 2011Reply With QuoteReport This Post
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