Air Pumping Losses

**IamIan** · 05-10-2008, 07:06 AM

I was trying to figure out the air pumping losses the Insight engine generates / faces.

I would think this is the same force when either in fuel cut mode and no regen but in gear... and when the engine is running but some power from the fuel combustion is over coming it.

The calculations I have done just don't seem right to me and I was wondering if others had any insights or knowledge that might get an accurate model?

The calculations I have done seem to yield about ~2.86kW or ~3.5HP of pumping losses at 1,000 RPM.. and go up proportionally with Engine RPM.

This just doesn't seem right to me... I know the real world always has variables that make calculations different from the results... but it still seems wrong to me.

**gpsman1** · 05-11-2008, 11:31 AM

I don't have any math to back it up, but by seat of the pants, that sounds too high to me.
I think it is closer to 1 HP.