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Yes, I had thought of that...
Posted by Mr. Science (more from Mr. Science) on Thu, 19 Sep 2002 16:41:24
In Reply to: acceleration..., JimBlake [Profile/Gallery]
, Thu, 19 Sep 2002 11:53:31
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the angular acceleration of all the spinning parts certainly is going to eat up some energy. I was lumping that in with the drivetrain loss, thinking that it was probably one of the larger components of that loss. Not true?
40# sounds heavy, I think the C900 was around half that, but I can't be certain.
Pretty nasty to calculate all the spinning parts individually. Wheels and flywheel should be the big ones, then the tranny gears. Balance shafts, cams, etc starting to get down to the nitty gritty.
Another thing I thought of is loss to accessories (i.e. alternator, water pump, p/s pump, etc) Again to me this would logically be lumped in with drivetrain loss (or at least something I might call "effective drivetrain loss")
Finally, under what conditions is the torque curve generated? How were intake/exhaust systems rigged for the test, for example?
To me it seems cleanest to look at it from the perspective of "how much torque is lost enroute from the crankshaft to the wheels?" Lump all the different causes of loss into an "effective drivetrain loss" factor. I made the assumption (perhaps erroneously) that this is what people did in talking about the 15% (or 12% that Saab claims) transmission loss. How could you measure such a loss otherwise?
Cheers,
'Roo
posted by 12.13.238...
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