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Author: Subject: Twin bike engine chain drive countershaft arrangement
tks

posted on 21/12/06 at 09:11 AM Reply With Quote
Thats correct

the you have eliminated the axle problem..

leaves you the possible woble in the Pinion it self (wich is sandwiched between the 2 flanges and will have the max movement / woble of the difference in it hole and the bolt.

Anyway i would do it in 1 piece. Splitting up has the only advantage that you could more easy change you diff ratio.

or piñion.

Tks





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NS Dev

posted on 24/12/06 at 12:37 PM Reply With Quote
Merry Christmas all!!

Spent some time mulling all this over in the bath the other night and thanks to all contributors of ideas (particularly MikeRJ) I now have a plan with which to form the basis of a chat to Geoff Berrisford at the autosport show over.

I will use std bike sprockets on the bike gearbox output splines. Will get a second set of these sprockets as well.

I will get two fairly short shafts made up with splines both ends to match the bike gearbox outputs (these are square face splines so fairly easy to cut) and will mount each shaft in 2 bearings and carriers probably sourced from gearbox kart rear axle carriers.

At the "outer" end of each of the shafts I will fit the spape bike sprocket, and at the inner end I will fit a 6 bolt flange with locating step on it. I should be able to get Talon Engineering to make these fairly cheaply, as they make the sprockets it follows that they must be able to cut the internal spline required.

I will sandwich an output sprocket and shim discs between these flanges, and use this to drive a single bike drag race chain (rated to over 500hp) to take the drive to another sprocket bolted to a welded sierra diff, mounted in flanged bearings to a carrier welded into the roll cage. This carrier will have lasered side plates and pusher bolts to set final chain tension and enable easy diff removal.

hardest part will be tensioning the primary chains. This will be done initially by sliding the countershaft mounts (made fairly easy by using the kart axle mounts) to tension both primary chains simultaneosly. If any differential stretch takes place then both engines will also be "shimmable" to individually alter chain tension.

Thanks for all the help!

will post piccies when its done!

cheers

Nat





Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion retro car restoration and tuning

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