Whipple Charged:
picked up 70 hp from 11.8 to 13 with a 1471? Was that steady state? Thats pretty rare in a marine roots blower.
And, yes, you can pick up torque and not hp, not at the same rpm, thats not what I said, but at a lower rpm while not making much hp. To give you an example, figure the cost of 100+hp on that same engine with 13lbs. of boost, not to mention you can achive a higher psi before detonation because of the cooler air charges. Not only that, it doesn't vary over time, they last longer, smaller, more compact, quieter, etc.
There is no comparison, call up Littlefield, he has to run a screw compressor on the alcohol car that he runs because the roots is no wear near competitive, even though it has major rule advantages with weight and engine size.
Thanks,
Dustin I have no reason to call him, a blown alcohol drag application is not my intended use, it is cool though.I paid 2500.00 for my 1471 add 500 for accessories.So I am at the low end of the roots cost estimate.That is still 4k under the whipple.The dyno session was a ramped pull on a DTS dyno. No steady state comparison.Final power number was 1166 @ 6500rpm.Tis was with the air cleaner on and 110 octane fuel.This motor was 1117 on pump gas@ 11.8 lbs of boost.My point is that excellant power can be made with old technology. This is comparable to a different 572 whipplecharged engine referred to in a previous post in this forum. No dual drive belts or belts popping off. I think your product is good but not when the price and looks come into play. Assuming I had the money to spend for a new whipple quad rotor, I would be better off going with a twin turbo/EFI setup similar to what Unchained is doing.It is VERY hard to beat a simple roots setup for great power and price.If he were to start out with a roots he could convert to one of your whipples when he has the money.I am curious about steady state dyno pulls. Do they yeild different numbers than a ramp type test?Thanks for posting the comparisons,very informative. When the screw blowers become more competitive price wise I will consider them as an alternative.These are my opinions and I do not want to seem dismisive of your good points.Thanks for responding
[ January 29, 2003, 05:35 PM: Message edited by: DEL51 ]