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Driveshaft Delete
PMo - 16/2/07 at 06:08 PM

I've done a good bit of looking on a few forums and have had trouble coming up with definite information on this topic. The general premise is to mount the output of the bike engine almost directly to a standard car differential in a mid engined BEC. The almost part of the mounting would be two universal joints or a cush drive (still not quite sure what a cush drive is yet...). Basically I was wondering if anyone could point me to some good information about setting up your drivetrain this way either in an old thread here or maybe in another forum. Maybe someone could help me out on what exactly a cush drive is too?
Thanks for the help,
Phil

froggy - 16/2/07 at 07:24 PM

chain drive is much simpler and gives you lots of gearing options where as the car diff will give you a further final drive reduction meaning searching for tall ratios and using bigger wheels. mk sell a chain drive diff for around £500

nitram38 - 16/2/07 at 07:33 PM

I am going to use a chain drive. It also will keep my engine facing the right way !

[img][/img]

blue2cv - 16/2/07 at 07:41 PM

Ive just got my chain drive transaxle from Allens Performance, nice piece of kit, so now have a straight forward chain driven diff assy spare, already for use if anyones interested.

Humbug - 16/2/07 at 09:17 PM

quote:
Originally posted by PMo
I've done a good bit of looking on a few forums and have had trouble coming up with definite information on this topic. The general premise is to mount the output of the bike engine almost directly to a standard car differential in a mid engined BEC. The almost part of the mounting would be two universal joints or a cush drive (still not quite sure what a cush drive is yet...). Basically I was wondering if anyone could point me to some good information about setting up your drivetrain this way either in an old thread here or maybe in another forum. Maybe someone could help me out on what exactly a cush drive is too?
Thanks for the help,
Phil


I think that the way you describe is how the Fisher Fury Menace is connected - it has about a 4" propshaft, IIRC.

http://menace.fishersportscars.co.uk/

PMo - 17/2/07 at 05:23 AM

This is going to be an autocross car so crusing rpm and top speed are not too critical. Also I want an IRS, is this possible with a chain drive setup?
Phil

nitram38 - 17/2/07 at 06:35 AM

[



how many teeth you got on that sprocket, looks too few, but that could be the picture.

with a 540mm diameter rear tyre, we've had to change the front sprocket down to 16 teeth and increase the rear to 54, that gives us a top speed around 134mph.

if you were to run 195/50/15's with the standard bike sprockets 17/46 your top speed would be a shade over 170mph

ideally to keep the engine up in the power for trackdays you need to be arranging your sprockets/wheel size and be aiming for around 130mph, any more and your just going to struggle to max out in 5th and 6th gear.

Chris


I bought the diff from another locoster on here for £200 less than he paid for it from zcars.
I will be after a new sprocket if you can put me in touch with someone who will do it?
I haven't counted the teeth on the engine as it is still in a box, under my seats in the garage, in front of my car!
I will also be swapping the output sprocket for a double version as I have a starter motor reverse kit from lynx racing. The cog should reach me next week.
I am going to be running 195/50/15 tyres . They arrived Wednesday. Told you I had lots of parts already !
If I run the standard bike sprocket, how many do I need on the diff?
I want to have some first gear!

[Edited on 17/2/2007 by nitram38]

nitram38 - 17/2/07 at 12:52 PM

Top end is not my bag, but getting there quick is !

PMo - 17/2/07 at 11:47 PM

Hey hey hey, figuring out what sprokets to use is all well and good but anyone got anymore info on the driveshaft delete setup? Like whether you can ran an IRS with one and if so how its done?
Phil

stevebubs - 18/2/07 at 01:02 AM

Fury Menace does exactly this...

quote:
Originally posted by PMo
I've done a good bit of looking on a few forums and have had trouble coming up with definite information on this topic. The general premise is to mount the output of the bike engine almost directly to a standard car differential in a mid engined BEC. The almost part of the mounting would be two universal joints or a cush drive (still not quite sure what a cush drive is yet...). Basically I was wondering if anyone could point me to some good information about setting up your drivetrain this way either in an old thread here or maybe in another forum. Maybe someone could help me out on what exactly a cush drive is too?
Thanks for the help,
Phil

blue2cv - 18/2/07 at 07:55 AM

Just mount your modded diff on bearing blocks, line up sprockets and bolt in. Driveshafts will fit in normal way enabling you irs set up to function, got one already done if interested

[Edited on 18/2/07 by blue2cv]

mad-butcher - 18/2/07 at 05:49 PM

Hi Phil
to answer your question think of a cush drive as a shock absorber, It's the lack of the cush drive as fitted in the rear wheel of a bike that gives the distinctive clunk as you put the car into gear, Hence the use of TRT propshafts, Hope the attatched photo helps to explain. all it really is is a rubber block either side of each of the five legs on the sprocket carrier.

[Edited on 18/2/07 by mad-butcher] Rescued attachment P2180002.JPG
Rescued attachment P2180002.JPG