4:71 or 471 GMC Supercharger
05-09-04, 04:14 PM
#26
Old [Sch|F]ool
It's 4-71. I believe the number means 4 cylinders, 71 cubic inches per cylinder. It was a scavenge blower on Detroit Diesel 2-stroke Diesel engines of the same name.
And then of course there are the 6-71 and 8-71 blowers...
And then of course there are the 6-71 and 8-71 blowers...
05-10-04, 02:18 PM
#27
Rotating once again!!
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yeah, thats what it is, i think that the 6-71 would be a bit much don't ya think?? and i don't even wanna think about the 8-71....
Can you say overkill???
Can you say overkill???
05-10-04, 08:25 PM
#28
Old [Sch|F]ool
Overkill is a band, not a concept. 
Chew on this: Roots blowers are VERY inefficient because of how much they beat the air. A larger blower turning slower will beat the air less.
So you could still run 6-7psi of boost and have efficiency possibly as high as 50% instead of 35 or lower (even into negative numbers). And beyond the less stress on the engine, additional power might even be enough to compensate for all the added weight.
Chew on this: Roots blowers are VERY inefficient because of how much they beat the air. A larger blower turning slower will beat the air less.
So you could still run 6-7psi of boost and have efficiency possibly as high as 50% instead of 35 or lower (even into negative numbers). And beyond the less stress on the engine, additional power might even be enough to compensate for all the added weight.
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