pro charger and compression ratio???
Thread Starter
Teching In
Joined: Feb 2009
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From: katy, Tx
pro charger and compression ratio??? ok guys I have a few questions about my build. my original plan was to build a high compression naturally aspirated motor, but im really leaning towards a procharger now. The thing is I already got all the machine work and reassembled my shortblock a few months ago. so my current set up is bored .040 over( making it a 358), align honed, full rotating assembly balanced, ARP main studs, block decked to .005,( I wanted to get it zero decked but my machine guy said it would be good to leave just a little to play with for insurance reason), new cam bearing and plugs, stock crank polished, eagle rods( SIR 5140), SRP pistons( 138082 forged flat top +5.00 cc), felpro head gasket(1074 .039 compress thickness). my original plan was to run a Le head with a 52 cc which would put me at 11.98 to 1 static compression ratio. Now if I keep everything the same but run the LE trickflow 23 degree which have a 62 cc I believe( correct me if im wrong) will put me at 10.55 t0 1 static compression ratio. the stock lt1 compression ratio is 10.5 to 1 so it seems like an alright compression ratio to run boost. It is not a daily driver just something I will take out on the weekend and the track a couple times a year. I just want to get your guys input and opinions because I really want to go the pro charger route. thanks! this is a pic of the shortblock I assembled back in december
TECH Fanatic
Joined: Sep 2010
Posts: 1,037
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Depends on how much boost you want to run.
10.4:1 is stock and you can run 8psi for safety reasons.
Its not so much worry about the compression ratio either its more about the bottom end holding up to the punishment.
These are traditional SBC, where they came stock 9:1.
10.4:1 is stock and you can run 8psi for safety reasons.
Its not so much worry about the compression ratio either its more about the bottom end holding up to the punishment.
These are traditional SBC, where they came stock 9:1.
TECH Apprentice
Joined: Feb 2009
Posts: 365
Likes: 0
From: A DEN
ok guys I have a few questions about my build. my original plan was to build a high compression naturally aspirated motor, but im really leaning towards a procharger now. The thing is I already got all the machine work and reassembled my shortblock a few months ago. so my current set up is bored .040 over( making it a 358), align honed, full rotating assembly balanced, ARP main studs, block decked to .005,( I wanted to get it zero decked but my machine guy said it would be good to leave just a little to play with for insurance reason), new cam bearing and plugs, stock crank polished, eagle rods( SIR 5140), SRP pistons( 138082 forged flat top +5.00 cc), felpro head gasket(1074 .039 compress thickness). my original plan was to run a Le head with a 52 cc which would put me at 11.98 to 1 static compression ratio. Now if I keep everything the same but run the LE trickflow 23 degree which have a 62 cc I believe( correct me if im wrong) will put me at 10.55 t0 1 static compression ratio. the stock lt1 compression ratio is 10.5 to 1 so it seems like an alright compression ratio to run boost. It is not a daily driver just something I will take out on the weekend and the track a couple times a year. I just want to get your guys input and opinions because I really want to go the pro charger route. thanks! this is a pic of the shortblock I assembled back in december
I have seen guys run more compression than you and 12 pounds on e85.. If you have e85 at a pump near you may be worth it.....
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E85 can make tons of power safely with boost! It will allow you to run more compression, boost, and timing safely, which can net a LOT of power.
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Another option is looking into meth which is more readily available and doesn't require change your fuel system. Not to mention it's only used when you need it as opposed to having to keep within range of an E85 pump.
E85 is great but it's not widely available enough, atleast where I'm at, to be considered a viable choice for a street car.
E85 is great but it's not widely available enough, atleast where I'm at, to be considered a viable choice for a street car.
Thread Starter
Teching In
Joined: Feb 2009
Posts: 12
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From: katy, Tx
fortunately for me I have 2 e85 pumps within 5 miles of my house. the car wont be a daily driver just something I take out on the weekends. I still need to do a little more research on e85 before i make my final decision.
