Help with comp. ratio
Thread Starter
Joined: Sep 2005
Posts: 8,139
Likes: 10
From: Chillicothe/Lima, Ohio
Help with comp. ratio whats up guys, i think im doing my comp. ratio right, everything im coming out with is giving me 11.22:1 SCR. im using the simple method
im using stock bore and stroke with GM MLS gaskets. i think they are .051 thats what im using for my calculations and im using Mahle pistons with 4cc valve releifs, TSP PRC 5.3 STG. 2.5 milled to 58cc. someone with some more experience want to help me cause if im right, im going to run a thinner gasket to get it up to 11.5-11.8. not sure if it matters, but im running a MS4 cam
total volume
---------------------------
combustion chamber volume
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combustion chamber volume
im using stock bore and stroke with GM MLS gaskets. i think they are .051 thats what im using for my calculations and im using Mahle pistons with 4cc valve releifs, TSP PRC 5.3 STG. 2.5 milled to 58cc. someone with some more experience want to help me cause if im right, im going to run a thinner gasket to get it up to 11.5-11.8. not sure if it matters, but im running a MS4 cam
Assuming that the Mahle pistons have the same compression height as the stock pistons and still using stock rods (puts it .006 above the deck) and using a GM MLS gasket (I used .053 compressed thickness x 3.97), I got 10.9 CR. Using a Cometic 3.910x .045 gasket, I got 11.17 CR.
Thread Starter
Joined: Sep 2005
Posts: 8,139
Likes: 10
From: Chillicothe/Lima, Ohio
sorry, its the stock block, rods and crank. the only thing im changing is the heads, pistons and cam. also all the other neccessary stuff for a heads/cam swap. just let me know if there are any other specs you need.
from the looks of it, im going to have to go with the pistons with the 2cc vavle reliefs, rather than the 4cc. should still have enough room to clear the MS4.
here are the specs from summit racings website
http://store.summitracing.com/partde...4&autoview=sku
any suggestions to get my comp ratio up to 11.5 or so?
from the looks of it, im going to have to go with the pistons with the 2cc vavle reliefs, rather than the 4cc. should still have enough room to clear the MS4.
here are the specs from summit racings website
http://store.summitracing.com/partde...4&autoview=sku
any suggestions to get my comp ratio up to 11.5 or so?
sorry, its the stock block, rods and crank. the only thing im changing is the heads, pistons and cam. also all the other neccessary stuff for a heads/cam swap. just let me know if there are any other specs you need.
from the looks of it, im going to have to go with the pistons with the 2cc vavle reliefs, rather than the 4cc. should still have enough room to clear the MS4.
here are the specs from summit racings website
http://store.summitracing.com/partde...4&autoview=sku
any suggestions to get my comp ratio up to 11.5 or so?
from the looks of it, im going to have to go with the pistons with the 2cc vavle reliefs, rather than the 4cc. should still have enough room to clear the MS4.
here are the specs from summit racings website
http://store.summitracing.com/partde...4&autoview=sku
any suggestions to get my comp ratio up to 11.5 or so?
1. 2.83 cc valve reliefs
or
2. Mill the heads to 56.83cc's
Last edited by 405HP_Z06; Apr 8, 2008 at 11:23 PM.
Thread Starter
Joined: Sep 2005
Posts: 8,139
Likes: 10
From: Chillicothe/Lima, Ohio
http://www.jegs.com/i/Mahle/644/LS13...757295%7C11183
guess it wasent 2cc....this one is 1cc releifs...
guess it wasent 2cc....this one is 1cc releifs...
http://www.jegs.com/i/Mahle/644/LS13...757295%7C11183
guess it wasent 2cc....this one is 1cc releifs...
guess it wasent 2cc....this one is 1cc releifs...
It's also worth noting these 1cc Mahle's come with 1/16,1/16,3/16 rings instead of 1.5,1.5,3.0mm.
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