450 gear and pinion question
- Thread starter cobieg
- Start date
coolgabsi
Super Mod & DEAL KING!
You'll need to do it again, but a helical gear is also less tooth count than usual. Helical gears are 121 tooth .. Straight gears are 150 tooth.
Stock 450 setup is 14t on 150 tooth so going 12t helical with 121t gives you more rpm BUT the gear mesh might change .. You'll have to move around the motor may be a bit but you'll e able to get perfect gear mesh at both motor and tail gear without any problems.
Stock 450 setup is 14t on 150 tooth so going 12t helical with 121t gives you more rpm BUT the gear mesh might change .. You'll have to move around the motor may be a bit but you'll e able to get perfect gear mesh at both motor and tail gear without any problems.
Tony
Staff member
Just remember there is 10 main gear teeth per every 1 tooth to the pinion.
14/150 ratio is 10.714
12/121 ratio is 10.083
There is .631 more turn on the main gear from the 150 to 121. Not much head speed more, but a little.
Just FYI, helical cut gears are made to be quieter. The straight cut slaps together when the main and pinion teeth meet up whereas the helical gently rub together from top to bottom, or bottom to top. And you get a little more tooth surface.
All cars on the road today have helical cut gears in the transmission because they are quieter. If you bust open a racing transmission, they are straight cut. It makes for faster shifting and more strength on the straight cut, but also more of a gear noise.
14/150 ratio is 10.714
12/121 ratio is 10.083
There is .631 more turn on the main gear from the 150 to 121. Not much head speed more, but a little.
Just FYI, helical cut gears are made to be quieter. The straight cut slaps together when the main and pinion teeth meet up whereas the helical gently rub together from top to bottom, or bottom to top. And you get a little more tooth surface.
All cars on the road today have helical cut gears in the transmission because they are quieter. If you bust open a racing transmission, they are straight cut. It makes for faster shifting and more strength on the straight cut, but also more of a gear noise.