Hi, I am in the process of planning a big block supercharger build up. I am thinking 478ci (4.5x3.76) with an f-2 centrifugal Procharger, and a Force EFI setup. If any body running a centrifugal on a big block and has any “if I would do it again” input please share it.

I am still keeping the option of a 540 and a 10-71 EFI, but weighing the cons/pros, and $$$ between the two. My goal is pure, mega horsepower… I’ll worry about traction later.

Thanks

Tom

I think you'll be happy with that combo. I did a D1SC on a 468 and a 540;didn't have the F series when I bought mine which would have been a better choice. Still made over 800 rwhp with 91 octane and 11 psi of boost. Had A/C, ps, the works.

Jody

Very, very nice. What injection setup is that?

What's the point of the 3.76 crank? if your goal is "pure, mega horsepower" why give away 60cu.in.? You're talking about leaving at least 100HP on the table and what for? There's no upside in running the little crank that I can see.

Tom

Originally posted by Kx69:
Very, very nice. What injection setup is that? Thanks. That's a FAST ECU, modified Vic Jr. manifold, 90 degree elbow, and Accufab monoblade throttle body.

Jody

60 more cubes sounds great although from what I have seen not a big hit with the centrifugal guys. Max boost is made at higher rpm's unlike a positive displacement blower.

What’s pretty interesting is the web page for Kuhl superchargers has a 502 on the dyno with a 10-71 and their $9000 EFI set up with an intercooler, and only 837hp @6000.0 While on the other hand Procharger has a 427 with no intercooler, 91 octane, and 1350hp @7200rpm.

Originally posted by Kx69:

What’s pretty interesting is the web page for Kuhl superchargers has a 502 on the dyno with a 10-71 and their $9000 EFI set up with an intercooler, and only 837hp @6000.0 While on the other hand Procharger has a 427 with no intercooler, 91 octane, and 1350hp @7200rpm. Whatever you do, don't fall into the trap of believing Procharger's numbers. They have caused their dealers and customers LOT of grief. Here's the scenerio: a customer reads that test claming 1350 hp out of a fairly stock 427 on pump gas. Said customer's jaw hits the floor and wants to build his own. This customer goes to a dealer saying "well, Procharger said I can build this and get this much power from this combo." Dealer says "no way." Customer and dealer both get in a verbal spat. Guess what? There have been quite a few unhappy customers and dealers angry with Procharger because of their claimed power numbers. A customer comes in thinking he can duplicate it and when a dealer says "no way" things get ugly. The dealer who tells the truth loses a sale, the customer goes and finds a dealer naive enough to believe Prochargers numbers and build the combo, and then when the motor doesn't make the power the customer thought it would he's angry with the dealer and unhappy he didn't get what he wanted.

I'm not saying they don't make a good blower (they do-- that's why I have one) but just don't believe everything they say when it comes to power numbers.

As far as displacement, the guy that helped me (and Jody) a lot in the past is Scott @ SD Concept (http://www.sd-concepts.com/) out of Rhode Island. He recently built 2 motors for customers, one a 454 and one a 502. Both were nearly identical. While the 502 had the power and torque advantage below 3500 rpm, the 454 made more power and torque (and quite a bit more) above 3500 because the 454 has less frictional and parasitic losses than the 502. The rules of building and component selection are a little different with centrifugals, and if you know how to use them to your advantage there is good power to be had.

As much as I hate sounding like a broken record when someone brings up that they want to build a centrifugal blower motor, I'll say it again: call Scott. He's a guru when it comes to this stuff. His prices are excellent, too. smile.gif

Troy

Since you say you are undecided let me throw something else into the mix; I believe that Blower Drive Service (or maybe one of the others) has a new high efficiency rotor design, air-loc rotors, for the rootes style blowers that looks very promising.

Your F2 and de-stroked 540 will make a pile of power for sure. All blowers have a boost map (efficency range) and you can change the blower drive ratios to have the power come in at a higher or lower rpm range.

The best advice I can give you is to deal with a known supercharger tuner. I too would reccomend Scott from SD in your neck of the woods. I ended up (but didn't start out at) Vrbancic Bros Racing in Cali. These guys knew how to make my engine sing! Bottom line was that my mild flat tappet BBC doubled its n/a power under their tuning. We ended at 5,800 rpm, your combo should go much further up in rpms.

Troy, I haven't yet met a manufacturer who didn't have puffy power predictions - they all do it. Where exactly did you see ProCharger claim that a crate stock 427 would make 1,350 hp with their blower? I feel no sympathy for the would be 8 second drag racer who thinks any such engine is *stock*. I mean c'mon now, how could that be a reasonable expectation. You also know that the shop that does tell them this is so probably isn't a reputable shop.

Thomas

I will deffinatly give SD a call, I just found there web page. That's what I was looking for.

The Procharger poster child is on there web page running the 427 with a 8.81et @ 155mph. I have a little more info in the literature they sent me.

I am also waiting for some info from Whipple this morning, they have a BB chevy system that they clame is 70-80% efficient. Unfortunately there on the West coast and they sleep in:)

FYI:

1275 HP Chevy 427 (http://www.procharger.com/nova.shtml)

Tom, I didn't notice airborne wings on your uniform. Brother , you're going to need them! At least to know how to fold your own chute!

Ever put the NO2 to the motor yet?

Hi Gene, unfortunately the car is away for the winter. I tried to get it to Kennedy's dyno in the falls although they are booked until late November. I think that I am going to hold off on the n2o though, the car is running way to good. If for some act of God something would go wrong, and that blower was full of n2o with all that fuel. If I break 550 at the rear in the spring I'll be happy.

The 478 is for a new project. I haven't found a platform yet. But it would likely be a 68-69 Chevelle, early Nova/Chevy II, or 67-69 Camaro. This would be more race, full cage, tubbed, stupid fast, etc.

Who is your machinist Gene? I am defiantly not going back to those monkeys who tried to balance rotating assembly by not installing the spiral locks. graemlins/clonk.gif

Tom

The machinist I used is a client and we had a "barter" arrangement, Van's Machine in Rochester. Bill is the owner, John his lead man.

Locally, the guy to use is either Carl McQuillen ( very good, but $$$) in Leroy, or Bob Pfeffer who is up in Collins. The only issue with Bob, although he is excellent and reasonable , is that he doesn't have a balance machine and sends the stuff to Klispie's, last I heard. I wouldn't get a balance job at Klispie's, just IMHO.

McQuillen will dyno the sucker for you as well. He did the exhaust boss welding for me. Carl knows his BBCs very, very well.

Yeah, my car is stashed up at Terry Young's high dollar storage place on Camp Rd. Man, I need to buy a house with a real garage.

We should get together and "talk shop" sometime. Plus if you need to qualify with an M16 , I just picked up a neat Bushmaster Varminter. Holding 1.1" 5 shot groups at 100m with off-the-shelf ammo.