im assuming that the gears in street cars that are cut at angles are called helical cut. i have read a few times about straight cut gears. What are the differences between these two (advantages and disadvantages). I tried to write what i thaught they were but it sounded stupid when i read it back so i deleted it.

Helical Gears
www.gearmotions.com/ helical.htm

Straight Cut
www.cbperformance.com/ catalog.asp?ProductID=64

For the scientific proof:
http://www-2.cs.cmu.edu/People/rapi...isms/chpt7.html

In short, helical gears operate quieter than straight cut. Straight cut will 'whine' the faster they go but offer both A. More directional application of force allowing for less power loss. and B. Higher acceptable loads until failure. Basically making the transmission stronger and more efficient. However though, like noted before, car manufacturers don't use straight cut due to the imense noise the transmission will produce.

Joe

Not to mention, straight cut gears are a buttload of money! If only I could afford a quaife gearset for my car , but its $5,000 for the gearset alone.

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1996 Ford Contour SE
3.0L V6 and Arizona Dyno Chip Turbo Kit
364 whp, 410 wtq @ 16 psi and only 4,700 rpms.
Contour Enthusiasts Group

To get an idea of a straight cut gear noise, many manual transmissions (especially the older ones) use straight cut gears for reverse only. Therefore, going in reverse produces a whine, but forward will not.

I love that noise.

I like any noise that a car makes besides the exhaust (not that i dont like that noise too).

and btw, if youve heard an F1 indy car...thats not the engine thats so noisy, thats the transmission your hearing.

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1996 Ford Contour SE
3.0L V6 and Arizona Dyno Chip Turbo Kit
364 whp, 410 wtq @ 16 psi and only 4,700 rpms.
Contour Enthusiasts Group

yea i always wondered wat that noise was wen goin in reverse