Thread: 350 twin turbo?

Tweet

I have a 1969 chevy c20 truck with a 350 that i rebuilt last year and has around 7000 miles on it. the only thing in the motor is high compression pistons, and a rv1 cam. otherwise i have a edelbrock 650 carb and aluminum intake, and long tube headers with 2.5 inch exhaust. I have been looking at twin turbo kits that are only running around 5 to 10 lbs of boost. my question is will my motor be able to handle this setup?

I am not expert or anything close but talked to a guy about my car.
He said that you really don't want high compression with turbos.
He said the ideal compression is about 9 to 1 for turbo's
He said you have to make adjustments for cylinder pressures.
To much pressure and you'll mess up the bearings or blow head gasgets
or the heads. I'm sure there is other factors that come in to play as well,
maybe the rings. Kurt

Originally Posted by 1969c20

I have a 1969 chevy c20 truck with a 350 that i rebuilt last year and has around 7000 miles on it. the only thing in the motor is high compression pistons, and a rv1 cam. otherwise i have a edelbrock 650 carb and aluminum intake, and long tube headers with 2.5 inch exhaust. I have been looking at twin turbo kits that are only running around 5 to 10 lbs of boost. my question is will my motor be able to handle this setup?

Do you have E85 available at your local gas station?
When contemplating forced induction, the available fuel is the main player.
There is static compression ratio, which is the ratio of volumes built into the motor and calculated from bore, stroke, combustion chamber volume, piston crown configuration, piston deck height and gasket thickness and then there is FINAL static compression ratio, which also factors in the pressure of the incoming fuel/air charge which is being compressed by the turbo(s).

Here's a final static compression ratio chart from Blower Drive Service that shows static compression ratio down the left side and blower boost across the top. The shaded area is the limit for pump gas. The white area is final static compression ratio you can operate on with race gas or alcohol.
http://www.blowerdriveservice.com/techcharts.php