max compression ratio
max compression ratio ok i have a set up for 11;4;1 cr and i am wondering if that will be safe to run 93 + oct since lt1 is reverse flow can i get a away with that ratio ... plus it will have the squeeze.. 150 shot ... someone tech in
I don't see it being too bad, just make sure to run 92/93 whichever is higher in your area. Maybe look into the dynamic compression ratio calculator and see what that sits at. If your dynamic is much higher than 9.5:1 then you may want to double think your course of action.
without cam specs and specifics for the engine you can't figure DCR and therefore can"t confirm what we all think, that he'll be fine.....
as for SCR I speced out a 414 with a SCR of 12.4:1 with a DCR of 9:1. With those numbers I could run 93 or even a boosted application (with some race gas) and really make some hp.....
as for SCR I speced out a 414 with a SCR of 12.4:1 with a DCR of 9:1. With those numbers I could run 93 or even a boosted application (with some race gas) and really make some hp.....
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo well i was goin to run an cc503 on this setup with ported heads and a 355 short block... but i've been thinkin bout the 383 and wonder how a 503 would act with it ...
While it would be "fine" by most standards, you can get away with something much bigger. You need more duration and lift to fill the cylinders of a 383. I would look for something in the 23x+ range closing in on .600 lift.
here is a good DCR calculator.
http://www.wallaceracing.com/dynamic-cr.php
Just plug in the #'s listed and you will see how the IVC effects the DCR.
CC 503 is a descent cam for someone needing to pass emissions and a very mild gear/stall set up wanting a 6200 RPM shift point.
If you do not need to pass emissions, want to shift at a higher RPM and/or have some gear/stall, a larger cam would probably be more what you are after.
Lloyd
http://www.wallaceracing.com/dynamic-cr.php
Just plug in the #'s listed and you will see how the IVC effects the DCR.
CC 503 is a descent cam for someone needing to pass emissions and a very mild gear/stall set up wanting a 6200 RPM shift point.
If you do not need to pass emissions, want to shift at a higher RPM and/or have some gear/stall, a larger cam would probably be more what you are after.
Lloyd
Launching!
Joined: Feb 2006
Posts: 206
Likes: 0
So with a good tune then 8.89:1 DCR would be fine to run on 93 octane judging by what has been said.
This topic is of particular interest due to the fact that the car I just bought has a 12:1 compression 396 and I need to get it to run safely on pump gas... horsepower doesnt matter on pumpgas, I can put a racegas tune in it at track. I just need to get from point a to point be safely on 93 octane.
This topic is of particular interest due to the fact that the car I just bought has a 12:1 compression 396 and I need to get it to run safely on pump gas... horsepower doesnt matter on pumpgas, I can put a racegas tune in it at track. I just need to get from point a to point be safely on 93 octane.
