|
Post by erik on Apr 30, 2013 6:36:48 GMT
Good progress! The loom takes a lot of time to make right I think it took me 150hrs to finish mine. knowing pics don't do justice for a tidy look on the loom (one has to see it for real to make up if it looks neat, it will always look like a spachetti incident IMO) I think it's pretty clean for the moment!
I'm interested how your differential works. I always thought the rod in between gearbox and differential on conventional cars acts as a torque dampener for the differential while cornering. I hope the chain and engine doesn't have to cope with push/pull forces. Is there any info on this available?
br, Erik
|
|
|
Post by marshabusa on May 1, 2013 8:54:28 GMT
Hey Erik,
Your right, trying to get the wiring loom to look pleasing on an exoskeleton frame is taking some doing!
Ah the differential, this is a tough one and one am not quite sure about. On a conventional setup, the engine is on mounts and has the ability to move, additionally theres a large rubber coupling between the gearbox and propshaft to the diff, so like you say dampens any forces. The engine in the mevabusa, just like when in the bike, is hard mounted to the frame, there is no movement available at all. The diff, shouldn't move either, so I'd gather it is going to be subject to push/pull forces. In car applications d/t the added rubber on the road, it is recommended to upgrade the bikes output shaft to a heavy duty one.
I didn't receive any information with the diff, which is a pain.
Maybe someone with more knowledge than me can step in here?
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on May 1, 2013 9:19:06 GMT
Hey Erik, Your right, trying to get the wiring loom to look pleasing on an exoskeleton frame is taking some doing! Ah the differential, this is a tough one and one am not quite sure about. On a conventional setup, the engine is on mounts and has the ability to move, additionally theres a large rubber coupling between the gearbox and propshaft to the diff, so like you say dampens any forces. The engine in the mevabusa, just like when in the bike, is hard mounted to the frame, there is no movement available at all. The diff, shouldn't move either, so I'd gather it is going to be subject to push/pull forces. In car applications d/t the added rubber on the road, it is recommended to upgrade the bikes output shaft to a heavy duty one. I didn't receive any information with the diff, which is a pain. Maybe someone with more knowledge than me can step in here? On bikes I have known in the past, the engine and rear axle were rigid mounted as you mentioned.I The dampins section was build into the rear wheel, and consisted of a series of rubber wedges/donuts that the sprocket acted upon within the rear wheel. These would act as the damper. I would not want any variation in distance between sprockets if i could help it, regarding mountin the engine/diff on nylon bushes etc. Thankfully, these are not big torque motors, so any shock loading should be minimal.
|
|
pip
Newbie
Posts: 2
|
Post by pip on May 7, 2013 8:03:06 GMT
This is a great thread, following it with interest. I have mine on order after a weekend trip to Stoneleigh.
Thanks for posting all the pics and comments, very interesting.
|
|
|
Post by erik on May 7, 2013 16:17:20 GMT
[/quote]On bikes I have known in the past, the engine and rear axle were rigid mounted as you mentioned.I The dampins section was build into the rear wheel, and consisted of a series of rubber wedges/donuts that the sprocket acted upon within the rear wheel. These would act as the damper. I would not want any variation in distance between sprockets if i could help it, regarding mountin the engine/diff on nylon bushes etc. Thankfully, these are not big torque motors, so any shock loading should be minimal. [/quote] I think you missed the additional forces on this differential. I am talking about wheel torque when cornering which is a push/pull interaction on the shortened drive chain which may cause exessive wear on sprockets and chain or even break the chain within a few miles? The wheel torque can be much higher as engine torque. The gearbox/clutch/chain might have a very hard time dealing with these forces which are the opposite direction where the engine is designed for. A traditional torque rod in a conventional differential is a damper but having removed the bike wheel+damper makes me wonder how this/any chain differential is designed. This differential looks not like rocket science to me from the outside. I hope I am wrong with my theory...
|
|
|
Post by marshabusa on May 9, 2013 6:46:11 GMT
Hey Guys, thanks for following the thread with interest, I am back at work now so the build is on hold again for another 5 weeks. Gutted as it's getting so close to completion and the weathers getting better. Really hoping to get the busa back to RTR for it's IVA before the end of June.
Hey Pip, that's brilliant, really looking forward to seeing how other builds go.
Hey Erik, time will tell how this drive train copes in the busa but the differential is a radical/quaife design and the exact same diff which is put into the hayabusa powered radical sports cars. We believe the diff to be of a epicyclic type d/t the way the integral reverse looks to work but again cannot be sure, no paper work supplied with the diff. Hopefully though I don't find myself changing chains and sprockets every 10 minutes.
|
|
|
Post by marshabusa on Jun 13, 2013 19:19:39 GMT
Right the race to finish started today. Was like christmas to start with opening all the parcels of bits I've been ordering and chasing up over the last few weeks. I've got everything now I think to finish, except a couple switches and lights for the dash. They should easily be next day delivery though when am ready. I am hoping to be all done and ready for IVA by next friday, lets watch that goal come and go! The suns out right now though and it would be a great night for a drive, so I recon I few late nights this week and it's manageable. Here goes!
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Jun 13, 2013 22:19:35 GMT
Good luck mate, you can do it!
Sent from my GT-I9300 using proboards
|
|
|
Post by marshabusa on Jun 19, 2013 17:04:30 GMT
|
|
|
Post by Paul (madeye) on Jun 19, 2013 17:41:47 GMT
i have a TRE for a thou that may fit the loom if you have not already got one
|
|
|
Post by kiwicanfly on Jun 20, 2013 8:46:57 GMT
Any chance you could photograph how you have mounted you exhaust to the chassis, I have made myself some brackets but as soon as I weld them on I will see a better system . Keen to see alternatives to my own idea. Cheers Rob
|
|
|
Post by marshabusa on Jun 20, 2013 13:41:59 GMT
Hey Paul, Thanks for the offer but i've already sourced one, it's a combined gear indicator, thought that would be a must for me, I'd never have a clue what gear I was in. Yeah Rob no problem here's some photos, I bridged between the two mounts on the silencer with some stainless flat bar, then mounted the two brackets I was supplied with on the angle iron diff mounts. I didn't like the idea of drilling the chassis at the corners to mount the brackets supplied, in line with the mounts on the silencer. I hope that makes sense. Here's one of the push pull mount for reverse
|
|
|
Post by 2beers on Jun 27, 2013 22:27:31 GMT
Great build!
Have you planned for a chain cover to keep the back end from getting spattered everywhere with chain-lube? That stuff has a tendency to find it ways to many unwanted places. I would also consider an automatic Scottoiler system or similar when it comes to keeping the chain lubricated.
Good luck with the finish! /Tobias
|
|
|
Post by marshabusa on Jul 5, 2013 4:24:53 GMT
Great build! Have you planned for a chain cover to keep the back end from getting spattered everywhere with chain-lube? That stuff has a tendency to find it ways to many unwanted places. I would also consider an automatic Scottoiler system or similar when it comes to keeping the chain lubricated. Good luck with the finish! /Tobias Hey Tobias, I hadn't actually thought about that yet but you are right, a cover will be needed or I can see my nice shiny bits looking pretty sorry pretty quickly. There is a cover thats angled the same as the roll over bar braces that goes right across the rear but I think I'll see if I can make something up closer to the chain. I am stuck with work at present with no sign of a finish, so I've arranged with RTR to collect the busa this weekend and they are going to finish off the last few little things and put it through its test. So hopefully next time I see it, it'll be registered and I can have a drive.
|
|
|
Post by marshabusa on Jul 31, 2013 12:51:50 GMT
|
|