Compression choice with a Vortech H/C.
Thread Starter
10 Second Club
Joined: Apr 2002
Posts: 1,755
Likes: 2
From: Cincinnati, Ohio
Compression choice with a Vortech H/C. I am building my block and am trying to decide on the compression ratio. I can get forged J&E pistons that are the stock 10:1 compression that are in stock. The dished pistons will take several weeks to get. I am thinking that the 10:1 may be the way to go. I am installing 6.0 stage II heads which will the C/R down slightly + the porting may reduce boost (i am also installing a cam). If I go down to say 9:1 I think the Vortech will have a problem getting the boost back without risking spinning the blower too fast (i.e. 2.75 pulley). Any thoughts?
Staging Lane
Joined: Apr 2002
Posts: 51
Likes: 0
From: ST. Louis MO.
Re: Compression choice with a Vortech H/C. The C/R should have very little effect on the boost you see. The better the engine moves air the lower the boost you see, ported heads, cam, headers, free flowing exhaust, will all drop boost pressure and give you more power.
I would go with the 9:1 C/R you can use less octane and timing is not as critical in keeping the engine from pinging.
I would go with the 9:1 C/R you can use less octane and timing is not as critical in keeping the engine from pinging.
Thread Starter
10 Second Club
Joined: Apr 2002
Posts: 1,755
Likes: 2
From: Cincinnati, Ohio
Re: Compression choice with a Vortech H/C. Thats a good point--thanks--I hadn't thought about it like that. Detonation is what i'm trying to avoid. I don't want to have to use special gas and the octane boost does not seem to work well.
