Opened My Dart 225's to 65cc
Thread Starter
10 Second Club
Joined: Nov 2007
Posts: 458
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From: Birmingham UK
Opened My Dart 225's to 65cc Together with my 4cc Mahle forged pistons and 4" crank can anyone tell me what comp ratio i am at? We run 95 ron fuel here at worst but mostly i use 98ron. Did some cleaning up while there too! I dont want to get into detonation situ's, what kinda cc's are you guys running. 4.070 Bore by the way.
With GM MLS gaskets and 005 out of the hole I get 11.769633146784093:1 cr.
Here's the link I always use:
http://www.csgnetwork.com/compcalc.html
Here's the link I always use:
http://www.csgnetwork.com/compcalc.html
4.07 bore
4.00 stroke
4.15 bore diameter
.053 compressed thickness
65cc combustion chambers
-4 cc valve reliefs
.005 out of the hole assuming you decked the block some.
= 11.702361206703528:1 CR
Zero deck = 11.561075648797588:1
.005 in the hole = 11.423471805965205:1
If you give me the pistons you are using and your deck height I can get it down exact.
Thread Starter
10 Second Club
Joined: Nov 2007
Posts: 458
Likes: 2
From: Birmingham UK
What leads you to believe that?
4.07 bore
4.00 stroke
4.15 bore diameter
.053 compressed thickness
65cc combustion chambers
-4 cc valve reliefs
.005 out of the hole assuming you decked the block some.
= 11.702361206703528:1 CR
Zero deck = 11.561075648797588:1
.005 in the hole = 11.423471805965205:1
If you give me the pistons you are using and your deck height I can get it down exact.
4.07 bore
4.00 stroke
4.15 bore diameter
.053 compressed thickness
65cc combustion chambers
-4 cc valve reliefs
.005 out of the hole assuming you decked the block some.
= 11.702361206703528:1 CR
Zero deck = 11.561075648797588:1
.005 in the hole = 11.423471805965205:1
If you give me the pistons you are using and your deck height I can get it down exact.
Assuming you are using the following Mahle L92 pistons:
and the block deck is stock at 9.240" with 6.125" rods as specified puts the pistons in the hole .010"
With all these assumptions, the compression ratio is:
and the block deck is stock at 9.240" with 6.125" rods as specified puts the pistons in the hole .010"
With all these assumptions, the compression ratio is:
Last edited by 405HP_Z06; Jun 22, 2008 at 01:39 PM.
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Thread Starter
10 Second Club
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From: Birmingham UK
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