Help with compression ratio, tried but confused
Thread Starter
Joined: Apr 2008
Posts: 1,616
Likes: 4
From: Fort Worth Texas
Help with compression ratio, tried but confused I am tryin to figure it out, I have tried some of the compression calculators and cant seem to get it right, hung up on deck height clearance, for one.
What would the compression ratio be on a stock 1998 LS1 short block with GM MLS head gaskets (I have read about .052 is what some say thickness is) with heads that have been milled to 59ccs.
any help would be appreciated.
I spun some bearings, and the crank is toast, Due to an electrical failure on the Nitrous system. So I am going forged 383 kit, but trying to figure out what pistons to go with that would give me a good pump gas compression ratio. car ran super on the Original LS1 block with the 59 cc heads. but have no idea of compression ratio.
I know alot of guys like the 408 but it is my understanding that to make the most of it I would need different heads, and to be honest that is another cost I just cant handle, I also like saving the 80 lbs on the nose of the car.
Oh yeah, It is a street car that sees the track on weekends, and going to the forged setup I am gonna spray 200 on it.
Thanks fellas.
What would the compression ratio be on a stock 1998 LS1 short block with GM MLS head gaskets (I have read about .052 is what some say thickness is) with heads that have been milled to 59ccs.
any help would be appreciated.
I spun some bearings, and the crank is toast, Due to an electrical failure on the Nitrous system. So I am going forged 383 kit, but trying to figure out what pistons to go with that would give me a good pump gas compression ratio. car ran super on the Original LS1 block with the 59 cc heads. but have no idea of compression ratio.
I know alot of guys like the 408 but it is my understanding that to make the most of it I would need different heads, and to be honest that is another cost I just cant handle, I also like saving the 80 lbs on the nose of the car.
Oh yeah, It is a street car that sees the track on weekends, and going to the forged setup I am gonna spray 200 on it.
Thanks fellas.
Last edited by RARON455; Dec 14, 2009 at 08:00 PM.
Thread Starter
Joined: Apr 2008
Posts: 1,616
Likes: 4
From: Fort Worth Texas
Yeah, I am stumped on the flat top pistons, and the fact that the pistons pop out of the hole, cant figure the deck height myself.. confused on it.. what numers are used to determine the volume with it having negative deck height?
I calculated that an 8cc dish should get you about as close as you can to the same compression in a 383, give r take for a mild hone.
What camshaft are you planning to run? Our 383ci kit with the Wiseco -8cc dished pistons and a .045" gasket (assuming zero deck with the Wiseco piston) you'd net right at 11.3:1 static. Of course you can tweak that a bit with decking on the block, gasket thickness, etc.
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Thread Starter
Joined: Apr 2008
Posts: 1,616
Likes: 4
From: Fort Worth Texas
Cam is a custom ground comp
224-236 @ .050 .610-.608 114+4 dyno Tuned by you guys back in september, Believe it was John? who tuned it. car ran super made great power and really screamed, last time at the track though it let go.
another question is will the wiseco pistons pop out of the bore like the stock ones, or will the block need to be decked to 0?
224-236 @ .050 .610-.608 114+4 dyno Tuned by you guys back in september, Believe it was John? who tuned it. car ran super made great power and really screamed, last time at the track though it let go.
another question is will the wiseco pistons pop out of the bore like the stock ones, or will the block need to be decked to 0?
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Cam is a custom ground comp
224-236 @ .050 .610-.608 114+4 dyno Tuned by you guys back in september, Believe it was John? who tuned it. car ran super made great power and really screamed, last time at the track though it let go.
another question is will the wiseco pistons pop out of the bore like the stock ones, or will the block need to be decked to 0?
224-236 @ .050 .610-.608 114+4 dyno Tuned by you guys back in september, Believe it was John? who tuned it. car ran super made great power and really screamed, last time at the track though it let go.
another question is will the wiseco pistons pop out of the bore like the stock ones, or will the block need to be decked to 0?
__________________
Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
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