Relationship between compression ratio and streetability???

[camcojb]

The D1 will not blow 14 to 18 lbs of wind on that many cubes anyway. Also, O rings can be a pain in the ass to seal. They are famous for water leaks. Be sure to have reciever grooves for the o rings cut in the head (not all shops do this), and plan on a tube of Aluma seal in the radiator for saftey on a o ring street motor.
O rings are old school with Cometics now available. I would do Cometics if I were building from scratch.

How is that? I made 16 psi with one on a 540, and although it may have been nearing it's limit it sure seemed to work for me. That was with heads that flowed 395 cfm intake and 295 cfm exhaust.

Granted an F1 or similar would have been better in my case but they weren't out when I ordered it. I think he can make 14-16 psi without issue.



I also love the Cometics, have them for my twin turbo build. However I ran o-rings on the 540 with the coated SCE copper gaskets and o-rings in the block only; never leaked a drop. I did add a tube of Alumaseal with that aluminum motor. The un-coated copper head gaskets did seep some.



Jody

[ProdigyCustoms]

How is that? I made 16 psi with one on a 540, and although it may have been nearing it's limit it sure seemed to work for me. That was with heads that flowed 395 cfm intake and 295 cfm exhaust.
Jody

Jody

Really? Everything I have been told is F1 is needed for that much boost. Procharger has been recomending F1s for everything we spec.
That is interesting, because I have a 455 we are doing now, and would rather use a D blower, but they are pushing us into a F1, and it is only for 8LBS boost?

I trust what you are saying 100%. I will see what happens when I talk to a different tech guy there. I need to follow up on that order anyway.

[camcojb]

Really? Everything I have been told is F1 is needed for that much boost. Procharger has been recomending F1s for everything we spec.
That is interesting, because I have a 455 we are doing now, and would rather use a D blower, but they are pushing us into a F1, and it is only for 8LBS boost?

I trust what you are saying 100%. I will see what happens when I talk to a different tech guy there. I need to follow up on that order anyway.

If I had it to do over again I'd use an F1 because we were looking at 1000 Hp or more. It wasn't available and the D1SC was the largest that was going to clear the stock hood without me making custom brackets to lower it.

We're making 700 rwhp in a 406 small block at 14 psi. Mine made 828 rwhp with 14-15 psi on the 540 and about 800 rwhp at 14 psi on a 468. I'm positive the F1 would be more efficient but the D1 can definitely handle it. The F1SC is the same body size as the D1SC also which makes it appealing as far as fit, but they do cost more.

There is something to be said for using a blower with more airflow than you need (to a point) and then running it slower. Air temps will likely be cooler and plenty of room to grow. But at 8 psi on a big block I feel the D1SC is plenty.

Jody