Compression ratio???
Thread Starter
Joined: Jun 2005
Posts: 2,265
Likes: 671
From: Oskaloosa, Iowa
Compression ratio??? Im planning to buy an LM7 based 347 short block and put Trickflow/Tooley fast as cast heads on it with 64cc chambers. I will use arp studs and gm mls gaskets. I have the choice of shelf pistons in -3.2cc or -11 cc. I’m thinking the -3.2cc and depending on deck clearance would put me around 10.7 to 1 static. Fuel is e85 and cam will be either the jam cam or a custom cammotion grind. Boost level will be around 15 psi to start, but I want around 800 rwhp eventually so what ever boost it takes to get there.
Lets avoid telling me how you make more with $300 junk yard builds all day long and stick to the topic of compression ratio on this build. Boost will be from my current D1x procharger.
Lets avoid telling me how you make more with $300 junk yard builds all day long and stick to the topic of compression ratio on this build. Boost will be from my current D1x procharger.
Last edited by BCNUL8R; Jan 25, 2019 at 05:10 AM.
Thread Starter
Joined: Jun 2005
Posts: 2,265
Likes: 671
From: Oskaloosa, Iowa
Sorry it was early...with the choice of -3.2cc or -11cc pistons and the other information about the combo which would you choose? Off the top of my head I think the difference was either 10.7ish to 1 or 9.8ish to one depending on the unknown deck clearance.
Thread Starter
Joined: Jun 2005
Posts: 2,265
Likes: 671
From: Oskaloosa, Iowa
As always appreciate your input.
I’m 10:1 with Jam Cam. Love my street toy. Many centri set ups here with 10.7 that have had great results. Jam Cam @ 6* overlap & E85, I would think you have a great set up. It’s all in the the tune.
Take a look at Detoxx, I’m pretty sure he runs a ProCharger with substantial boost @10.7.
Take a look at Detoxx, I’m pretty sure he runs a ProCharger with substantial boost @10.7.
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Joined: Dec 2014
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We have a lot of customers in the 10.5:1 neighborhood on E85. Also, if I may, have a look at our CS 232/248 LS Supercharger Camshaft. It is a terrific performer in an aggressive setup:
http://www.cammotion.com/camshafts/c...r-centrifugal/
http://www.cammotion.com/camshafts/c...r-centrifugal/
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I’m 10:1 with Jam Cam. Love my street toy. Many centri set ups here with 10.7 that have had great results. Jam Cam @ 6* overlap & E85, I would think you have a great set up. It’s all in the the tune.
Take a look at Detoxx, I’m pretty sure he runs a ProCharger with substantial boost @10.7.
Take a look at Detoxx, I’m pretty sure he runs a ProCharger with substantial boost @10.7.
I would absolutely go with the higher compression with a centrifugal and e85. The boost curve of a centrifugal lends itself to working well with higher compression compared to small turbos or positive displacement blowers.