BBF torque ratings with Procharger

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BBF torque ratings with Procharger

Post  Finmach on December 5th 2011, 7:40 am

I am planning with my friend a blown 521-572 cid engine. Our goal is to achieve with Procharger F2 a 1200 hp with low boost. How much can I expect a torque to grow from app. 700hp/700lb ft N/A engine after given a F2 with boost around 7-9 psi. Blowthrough carb is to be used without intercooler and max ported SCJs or P51s are on the list, Victor Jr intake, mechanical roller etc.

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edit
compression ratio will be around 9.00-9.50 and will be using pump gas.

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Re: BBF torque ratings with Procharger

Post  Tennessee Bullitt on December 5th 2011, 6:54 pm

Unless you get custom pistons you will be 10 to 10:5 to 1 on the compression.

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Re: BBF torque ratings with Procharger

Post  Finmach on December 6th 2011, 2:46 pm

Custom pistons aren't an issue. Dish close to Grand Canyon is expected. Everything is dependind from the stroke & bore after they are decided. For example +38cc dish compared to 4.300" stroke and 4.440" bore, piston 0.020" down the hole and we're close to 9.5:1 with 73 cc heads. I am more interested from the torque increase or does it acts like a hp figure - 500 hp N/A, with 15psi of boost you'll double the hp figure?

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Re: BBF torque ratings with Procharger

Post  dfree383 on December 6th 2011, 3:54 pm

as far as HP is concerned yes, add a atmosphere = X2 is a good rule of thumb, I'm not positive is the rule applies to torque as well.

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Re: BBF torque ratings with Procharger

Post  Tennessee Bullitt on December 6th 2011, 5:39 pm

I would think to say on the 700ft lbs you should grow to 850 to 900lbs. The HP will definatly be way up there. I havent seen to many big blocks but a lot of small blocks run a little more TQ but the horse power is unreal with rpm's.

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Re: BBF torque ratings with Procharger

Post  Finmach on December 8th 2011, 9:03 am

Tennessee Bullitt wrote:I would think to say on the 700ft lbs you should grow to 850 to 900lbs.
From few other sources I have read & heart the same figures, modest one from was 800 lb ft ending up to 900+ lb ft.

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Re: BBF torque ratings with Procharger

Post  whatbumper on December 9th 2011, 8:28 am

I honestly would say 1000+ on the torque

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Re: BBF torque ratings with Procharger

Post  Finmach on December 9th 2011, 8:37 am

whatbumper wrote:I honestly would say 1000+ on the torque
Thanks from the input. +1000 lb ft with 7-9 psi of boost or with the 15 psi?

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Re: BBF torque ratings with Procharger

Post  whatbumper on December 9th 2011, 8:54 am

I say that for a few reasons: yes it is low boost but it is boost, but you will be lowering the rpm of max horsepower with the blower which in turn will raise the torque from idle up.

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Re: BBF torque ratings with Procharger

Post  2POWERADDERS on January 20th 2013, 10:26 am

watching this thread for results

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Re: BBF torque ratings with Procharger

Post  Finmach on January 28th 2014, 4:48 am

Sorry to wake the ol' topic, but for the poweradder that the build changed direction, I would have wanted to see how it would have worked out with blowthrough and F2.

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Re: BBF torque ratings with Procharger

Post  95 COBRA on January 28th 2014, 11:25 am

What direction did you go? I would think 1000-1100lbs should be reasonable, heck, my 347 F1R combo made 800 ft lbs so I would think my new 548 A headed motor with my F-3 should make that.

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Re: BBF torque ratings with Procharger

Post  J.Toney on January 29th 2014, 10:22 pm

Even though its Generic Motors stuff, I've know of a couple 540-580" setups, one with an older F2 and a "safe" tune up. Making something like 1200# almost everywhere RPM wise on 20psi peak boost, crested 1200 around 5000rpm and 11psi. E85 no intercooler

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Re: BBF torque ratings with Procharger

Post  Finmach on February 28th 2014, 3:01 pm

Actually I stayed with n/a engine and was going to upgrade the mechanical roller and with Dominator. But the time goes by and now there are F-1A, intercooler and blow through carb collecting dust. Will convert my fuel pump for E85 and give a shot. Gonna stay with 6-8 psi of boost. This project will start in nex autumn, so plenty of time to change plans... No, actually now once I got a good deal from the kit I will install it as planned and see how the boost feels with the bigblock. Car will be adjusted at the wheel dyno 10 miles from my house, so when it's done I'll let you see the dyno graph.


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