Iron head compresion ratio in a superchared application

How much compession can you get by with in a supercharged (roots blower) iron headed engine? (using race fuel, no e85 or methanol)

jones wrote:How much compession can you get by with in a supercharged (roots blower) iron headed engine? (using race fuel, no e85 or methanol)

Dang Josh ......... you ask those hard questions

I would say more than your stock block will contain. With race fuel compression could be more than practical.

I'd like get the truck into the high 9's Which I figure would take 800hp.I am at 10.8 c/r right now.

My opinion is 10 lb of boost would do it..............With a charger capable of moving enough air at that boost level. My 331 cid Lightning is doing 500 to the rear tire on 14 lb with 200 cfm sissy heads and 8.5 :1 compression.

Should I look for a 8/71 or 10/71 gas blower unit for the 527cu (non stripped)

That question is above my pay grade, but I would guess a 10/71 would move more air and have a cooler charge.

And not be to big on a 527 inch engine.

Maybe some of the blower guys will enlighten us............

I hope we have some blower guys see this. It would be nice to get some more info and recomendations.

come on jones stop trying to make your truck faster lol i was hoping we were gonna have a good race when we both got threw

Big block fox 339 wrote:come on jones stop trying to make your truck faster lol i was hoping we were gonna have a good race when we both got threw

LOL after looking yesterday at prices of these roots blowers I might as well stick with nitrous.

jones wrote:

Big block fox 339 wrote:come on jones stop trying to make your truck faster lol i was hoping we were gonna have a good race when we both got threw

LOL after looking yesterday at prices of these roots blowers I might as well stick with nitrous.

Good idea.
If my BBF Procharger deal doesn't work out, I am going to spray it a bit.

jones wrote:

Big block fox 339 wrote:come on jones stop trying to make your truck faster lol i was hoping we were gonna have a good race when we both got threw

LOL after looking yesterday at prices of these roots blowers I might as well stick with nitrous.

Yeah I think I'm just gonna stay with a Lil hunerd shot