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| Re: New Cars for Certain Lines (872026) | |||
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Re: New Cars for Certain Lines |
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Posted by Steve B-8AVEXP on Sun Dec 13 20:10:59 2009, in response to Re: New Cars for Certain Lines, posted by fisk ave jim on Sat Dec 12 16:13:00 2009. Postwar cars had helical-cut bull and pinion gears (whose teeh are cut diagonally) that are much quieter than spur-cut gears (whose teeth are cut straight across), which the prewar cars had. The musical moaning and groaning is caused by the spur-cut teeth meshing. If you own a car with a stickshift, the reason reverse gear moans while the forward geras do not is because reverse gear has spur-cut gears while the forward speeds have helical-cut gears. |
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