Savage 25 spur gear Question

[RussSAV25]

Hey guys, i wasted my 49t gear my fault didnt tighten moter down enough. I went to get a new one and all they had was a 52t. Howwill this efect the truck will it be faster off the line and i lose top end or is it the other way around. Should i see if i can get the 49 t again? I notice it says with the 18 t clutch bell is for on road only why is that does it make it alot faster or something and by me going to the 52 is it the same thing. can i still use it off road. Sorry for all the ?'s just want to under stand the gearing. THANKS ALOT FOR ANY INFO.

 

[TRDStreetFighter]

more teeth on a gear mean higher top speed less torque.. less teeth more torque less top speed.. if you ask me.. get the more torque.. savage was designed for off road use... all fun and games to go on straight light.. if that's the case then just get a on road car... you put higher gearing in it and go off road you'll get left behind...

 

[BlueRidge1]

Russ,

I just did the same thing yesterday - wasted the 49T. I like jumps and I think the slip on the spur came mighty tight from the factory. Anyway, I got a 52 tooth spur by accident and had a bugger of a time making it work with the 18 CB - hence my post last night. See the one right next to this one called "18t/52t......"

This is how the ratio works:

Stock setup:

15T CB driving 49T Spur: 49/15=3.26; meaning engine has to turn 3.26 times to every turn of the spur. This is the offroad setup.

18T CB driving 49T Spur: 49/18=2.72; meaning the engine has to turn 2.72 times for every turn of the spur. This is the onroad setup.

Notice that the offroad gear ratio is taller than the onroad gear ratio. This means that the engine turns more often per final drive revolution at the tires than with the onroad setup. Basically, you are multiplying the TORQUE of your engine while sacrificing top end. TORQUE is what gives you out of the hole performance and wheelies - in the electrical word it's known as current (AMPS).

The onroad set up is just the opposite. The engine spins less for every final rev at the tire and now your top end has come up. You do this by sacrificing torque. Through all this, HP remains the same, gearing just allows you to change engine torque delivery - which ultimately affects your top end - there is no free lunch.

HPI warns against using the onroad setup in the dirt because the engine could labor - it would make less torque (as seen after the gearing) and have to work much harder for "breakaway" power.

Anyway, back to the 52T. You can use the same math as above and see that the 52T would yield 52/15=3.46 or 52/18=2.88. The first one, 3.46, would be a very offroad setup as the engine would have to spin 3.46 times to one rev of the spur. The second one, 2.88, would be interesting as it is in between the the on road and offroad setup. The only problem is, as I found last night, the 52/18 doesn't fit right. So I'm gonna experiment with the 52/15 for a while - Super offroad.

I hope this helps.

 

[RussSAV25]

Thanks now i understand more. Now my problem is i lost the old gear and the new ones dont come with the little bearing so i have to wait for hoppy shop to open and get another one if they have it.