Engine Modifications

[skandalousX]

Take it from someone who had one on his 3.4l V6 Grand Am GT, then switched to a Whipple 1600ax...... the eaton blowers suck.

Don't spin up as fast, yield very hot air charges, suck on top end, are usually overrated as for engine placement.

[Skoolbus]

Originally Posted by skandalousX

and yields a very low temperature charge in the intake manifold because it creates more boost at lower rpms'..

The fact that it may create more boost at lower RPMs doesn't mean that it will "yield a very low temperature charge in the intake manifold". The temperature charge is dependant on the pressure rise across the compressor (boost) regardless of the RPM at which it's running. So two compressors producing the same amount of boost at different RPMs will be producing nearly identical "temperature charge".

[skandalousX]

Originally Posted by Skoolbus

The fact that it may create more boost at lower RPMs doesn't mean that it will "yield a very low temperature charge in the intake manifold". The temperature charge is dependant on the pressure rise across the compressor (boost) regardless of the RPM at which it's running. So two compressors producing the same amount of boost at different RPMs will be producing nearly identical "temperature charge".

Being that there's less friction, since it can create boost at lower rpm's........there's less temperature change.

Temp is not completely dependant on boost levels. If that were the case, centrifugal's would create the same high temps as a roots style supercharger.

Intake temps dropped 40 degrees on average, at the same boost levels, between my roots and twin screw superchargers.

That was going from the Eaton m62 to the Whipple Twin Screw 1600ax. 40 degrees is a lot.....

[Skoolbus]

So you're saying that you got a 40 deg temperature drop because one supercharger had less friction than the other?

So your compressor was dumping heat into the air flow at a rate high enough to raise the temperature by 40 degs higher than the other compressor? And you're attributing the temperature rise to internal FRICTION????

I'm not saying that you didn't actually measure this temperature delta, I just think it's highly more likely that something else was causing it, such as differing air mass flow rates, a misplaced thermo-couple or different pressure deltas across the compressor. In order for the air flow to have been 40 degrees hotter in one product vs. the other (at steady state, with everything else the same) the surface temp of the actual compressor must have been MUCH higher than 40 degrees hotter than the cooler compressor, which as you correctly stated, would be pretty stinkin' hot.