Reduction gearing at flywheel to improve everyday drivability?
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Reduction gearing at flywheel to improve everyday drivability?
This discussion was started in another thread:
https://www.s2ki.com/forums/showthread.php?...threadid=120829
https://www.s2ki.com/forums/showthread.php?...threadid=120829
If the biggest complaint of a high revving and low torque engine is its impracticality in everyday driving (ie noone wants to dump the clutch in city driving), why not put part of the reduction gearing at the fly wheel?
For example, we put a 1.5:1 gearing on our F20C flywheel, reducing the redline to 6000 RPM. We then end up with a flywheel output peak torque of 230 lb*ft. Horsepower remains the same since RPM is reduced by the same proportion torque is increased.
Elistan or anyone; why is this not desirable?
For example, we put a 1.5:1 gearing on our F20C flywheel, reducing the redline to 6000 RPM. We then end up with a flywheel output peak torque of 230 lb*ft. Horsepower remains the same since RPM is reduced by the same proportion torque is increased.
Elistan or anyone; why is this not desirable?
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You are missing the point. The flywheel is not the problem. Besides, the flywheel is connected directly to the crank shaft, and trying to gear it down would require the engine to be redesigned. There would be NO difference in overall effect of gearing any part of the drivetrain down by 1.5:1. The gear ratios from engine to wheel build on each other. It doesn't matter whether the 1.5:1 change happens at the flywheel, or at the ring & pinion.
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Why do you think it is "difficult" to match a high RPM flywheel to a stationary clutch disk? I find that my clutch is easier to operate smoothly than any V8 / manual shift car I've driven. Honda doesn't do what you are talking about because it is ... well ... silly. There would be NO benefits.
The S2000 does not have much power at low RPMs. Gearing can not change this characteristic. Lower gearing can improve torque at low speeds, but not low RPMs.
The S2000 does not have much power at low RPMs. Gearing can not change this characteristic. Lower gearing can improve torque at low speeds, but not low RPMs.
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Let's see: my S2000 is at almost 4000 engine rpm at freeway speed in 6th gear. With a 1.5 reduction gear, I could be overwhelmed by 6000 rpm engine noise for mile after mile. What a deal! And it would only take a small engineering miracle to make it fit!
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Anyway, with a 1.5:1 reduction gear at the crankshaft, you could leave the transmission alone and simply change the final gear in the differential from 4.11:1 to 2.74:1 and you'd retain the exact same speeds in each gear
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You are REALLY missing the point here. Gearing it down at the front of the drivetrain, then gearing it back up again at the end of the drivetrain just cancels out. The ONLY change you are talking about now is just an increase in drivetrain loss!