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Old 09-15-2010, 04:04 PM
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N2O BBC V.S. 8-71 Blown BBC

I am a Pro-Street Junkie.

I love the idea of a Pro-Street Street/Strip car or truck.

Engine Idea #1) 502 production block,4.5 bore 12-13:1 CR forged pistons, 6.385 inch forged rods, 4.375 inch forged crank, solid roller cam, Holley Pro Dominator Tunnel Ram, Edelbrock Xtreme Heads, Twin E-85 1050 Dominators, N2O Fogger 200-300 HP (Total CID 557)

Engine Idea #2) 502 production block, STD 4.468 bore 8.75-9.6:1 CR forged pistons, 6.385 inch forged rods, steel 396/402/427 crank, Hydrallic Roller cam, twin E-85 950 Double Pumpers, 8-71 Roots blower overdriven 11-20%(10-12 PSI), N2O Fogger 100-200 HP (Total CID 472)

HP estimate 650-800 HP off the bottle.

Which option do you prefer & why?

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Old 09-15-2010, 04:46 PM
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Why shorten the stroke and kill the cam with hydraulics on the blower motor?? Keep the same 557 cid as the nitrous motor,solid roller, and just use the lower compression and put the blower on that.

Why do people have this weird facination with short strokes?? They don't do anything to improve power unless you want to go to really crazy rpm levels, and that gets freakishly expensive.
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Old 09-15-2010, 06:41 PM
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I agree, keep the longer stroke and build the blower motor. The blown engine would be better because you will have big power all the time instead of only when you are using NO2.
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Old 09-16-2010, 08:56 AM
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We just got done with a boat yesterday. twin 522 whipple supercharged, both motors went to the dyno in louisanna and made 685 hp @ 5300 rpm. Both motors were fully dressed with all the accessories, two hydraulic pumps, power steering pump, water pump, alternator, just as they belong in the boat. Using a hyd. roller cam. I wanna use a whipple supercahrger on my next street ride myself. You can use both power adders, the blower motors love n20 because it cools the air charge down. I personally would keep all the cubes as possible, but not just for nitrous.

Build a 500 horse motor with a blower what you got? A blown motor.
Build a 700 horse motor with a 300 shot what you got? A soon to be blown motor.
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Old 09-17-2010, 12:48 PM
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The reason I was talking about a steel 396/402/427 crank & using a Hydrallic Roller cam was to reduce the displacement to kill some of excess low end TQ & to reduce rpm range to 2800-6000 rpm .

Thank you all for sharing your experiences.
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