Cvt gearbox

piggy · Posted: Wed Jan 01, 2014 2:03 pm Post subject: Cvt gearbox

Hi, looking at bits and pieces for the next project
As the spider is nearly done

Any thoughts on a cvt drive and gearbox that can
Take 100-200 hp in a Polaris type vehicle

teamidris · Posted: Wed Jan 01, 2014 6:31 pm Post subject:

A small old combine is all I can think of? Assuming you mean the torque of a car engine? Sheave is hydraulic actuated.

piggy · Posted: Wed Jan 01, 2014 8:03 pm Post subject:

ash awbery · Posted: Thu Jan 02, 2014 8:42 am Post subject:

Do you mean variomatic drive? Like daf cars used?
I think it's a very good system smooth as no gear changes as such. I think early fiesta autos used it so you could use a fiesta engine and box mounted inline and used the diff as a transferbox? Would work well on something light with suzuki axles..

Ash

Russell · Gate Opener Joined: 18 Dec 2013 Odometer: 7

My wifes Honda Jazz is cvt strange to drive the rev counter stays at 2000 and the Speedo rises.

Prob is jaz sub 100 BHP.

Regards

Russell

teamidris · Posted: Thu Jan 02, 2014 11:15 am Post subject:

Hence the combine option Smile

It's the only thing I know big enough, but it's not speed changed.

Are you that against auto? Just a massive range of choice in this technology? And it does the job.

minimog · Off-Road Guru Joined: 25 Nov 2004 Odometer: 1700

Im sure berisford do a cvt drive box for autograss buggys they arnt the cheepest option but might be worth a look

piggy · Posted: Thu Jan 02, 2014 6:58 pm Post subject:

RichardD · Posted: Fri Jan 03, 2014 11:02 am Post subject:

I'm not sure it would cope with the torque needed for off roading but there ahve been a few cars with CVT gearboxes:

Nissan Micra
Volvo 340
early fiesta auto

All small, lowish power/torque.

octo0072000 · Posted: Fri Jan 03, 2014 1:28 pm Post subject: cvt box

Rover 45 did a cvt on the 2.0 petrol engine i believe that is the honda engined one thats over 100bhp

teamidris · Posted: Sat Jan 04, 2014 8:01 pm Post subject:

I did the polaris course when E L Cooper was a dealer, and it is flipping brilliant Smile

Loved driving them.
If you can afford the R&D time I would try the polaris CVT on a bike engine. Worst it may do is have shortened belt lives?
Except I wouldn't, I'd just go find a big polaris and mod that. Less power, but so much stuff already in place like the electric front hubs.

noodle247 · Posted: Sat Jan 04, 2014 10:32 pm Post subject:

I believe merc a and b class cars are cvt.
I recon there'll be a lot of electronics on em though.
Rover 25 & 45 had cvt as well.
Not very reliable my house mates died at 36k from new.
Went well though. When you floored it it'd hold engine at peek power
An move the gearing up.

Would be interesting to see in a buggy.

Rotordogg · Posted: Thu Jan 09, 2014 11:33 pm Post subject:

Talked to our gearbox rebuilder awhile ago about CVT boxes, he said there not reliable enough for serious off-roading, though we were talking about heavier 4wd's than you are looking at (1200kg, 35" tyre...).

There are a few different ones out there, I'd look for something bigger and stronger than you think you'd need.

FlatBlack · Posted: Thu Feb 06, 2014 9:48 pm Post subject:

CVT's in the side by side (UTV, RZR, etc) industry and in the snow mobile industry will handle ridiculously high loads when set up properly.

Check out companies like STM and Team Industries and spend some time on Youtube looking at 200-300 WHP RZR's in the dunes and snow mobiles set up for asphalt and grass drags making upto 600 HP.

Additionally, Gates makes carbon fiber and Kevlar impregnated belts for high load and high HP applications.