Quote:
Originally Posted by cleanspeed1
The problem is the frictional losses go up with a set up like that and can possibly pull the engine out of its best operating range ( you're lugging the engine ), so you have to calculate where the rpm is going to fall when the second OD is kicked in.
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I currently read about 2050 RPM at 72 MPH. I figure that with a 0.78 overdrive, I'll go down to 1600 RPM.
Friction? I figure that friction from the propeller shaft back to the wheels should not change, and friction before the overdrive should actually go down. The overdrive itself, though, will add an element of friction. Whether that friction is significant enough to affect FE is another question entirely.
I'm not that concerned with lugging at 1600 at part-throttle while going down the highway, which is the only time when I would engage a second overdrive.
Quote:
Originally Posted by Frank Lee
Why not go to gearvendors.com to see what they say about it?
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They have not responded.