GN GNAT Cycle Kart: The Driveshaft
Here's a video demonstrating the drive setup on my GN GNAT cyclekart build. For my kart I went with a front engine design, which makes transferring the drive to the rear wheels a lot more complicated than if I built a RWD kart. To do this, I found a Polaris differential/right angle gearbox from an AWD quad (part #1341323). The gearbox uses 22t splined input and output shafts which forced me to use Polaris's drive shaft. Unfortunately this drive shaft has a design flaw where the two yokes are out of phase by 60 degrees which caused a lot of vibration. I had the shaft cut and then realigned it to reduce the vibration significantly.
I'll do a better video in the future that goes over the whole drive system in more detail
Пікірлер: 21
A proper evolution for those wanting to go with a front engine configuration. Thanks for doing the research on this and sharing the information.
@tremortech
8 ай бұрын
Thanks!
I am also doing the front engine setup. The only difference is I am using both gearbox output shafts. One for each rear wheel independently. Thanks for your research and how to video. It saved me a bunch of time. I also used the Polaris gear box and splined shaft. Both cost $100 on E-Bay.
Wait, front engine, AND rear wheel drive?!?!? AWSOME!!!!
The video still shows a dynamic run-out that will still give you vibration at speed.I suggest that you have it balance by a driveshaft shop. Good aplication , enjoyed the video.
Very nice. Cycle car must be very similar size to the original Gnat. :) Thank you for posting...
@tremortech
8 ай бұрын
It's around 3/4 scale to gnat... thanks!
Very interesting ! A pleasure to see how you solve the mechanical problems on an usual front engined cyclekart. 😉
Thanks nice I think that is great. I did find a diff on Craigs list for $20, guy just wanted to get rid of it.
Cool set up.👍🏻👍🏻👍🏻
Fantastic build my friend. I am starting to build a front engine/rear drive similar to the Morgan three wheeler or Pembleton setup. Are you in Pa or on the East coast?
@tremortech
Жыл бұрын
Sorry, opposite coast. California. Good luck on your build!
@johnkoury1116
Жыл бұрын
@@tremortech Thank you my friend. take care. Love your videos!!
How do you have your torque converter attached to your drive shaft? How does the Polaris front differential turn the right direction for the rear wheels?
@tremortech
11 ай бұрын
Drive pulley of the torque converter mounts directly to the engine. Regarding Polaris rotation, I got lucky, but I did my homework first. I verified the engine rotation direction, then checked the Polaris input shaft rotation. Fortunately it all worked!
How did you connect the front drive shaft to the engine?
Thanks for the info but why do your hands sale if u don’t mind me asking
@tremortech
10 ай бұрын
I have a condition called "Essential Tremor" that causes my hands to shake. It's very annoying but I get by.
😀👍
Why didn't you use a chain drive from engine in the front [rotated by 90 degrees] via possibly a lay shaft to sort out gearing etc?
@tremortech
8 ай бұрын
This design matches the original setup of my inspiration car...and I don't like long chains!