26-01-2021, 02:21 PM
I'm helping a friend out here in the Colonies build a single seater hill climb special using two 500cc pre war JAP engines or more specifically just a pair of crank cases which now have barrels from something else on them so now around 750cc each, linked by a chain to each other & a second sprocket links to a motor bike gearbox & clutch of equal age and this links to a sprocket in a banjo case A7 rear axle which has had the banjo case removed and just a suitable spacer installed to facilitate the chain around the sprocket. The chassis was narrowed at the rear and the axle was offset to make place for the driver's seat. In the quest for lightness, it's having lots of drillesium added to everything, so has been christened Holey Grail or The Grail for short
Rest assured that everything on it was dug out of various scrap bins, the chassis was already broken & damaged, the banjo axle tubes were bent and there was never a center portion. Springs were an assembly of shrapnel out of various A7 scrap bins in various people's sheds, just sized to match at the rear. Even the JAP crankcases and cranks were leftovers from motor bike guys rebuilds, hence having no barrels. The barrels came off another engine with a holey crank case & amazingly the rods will work on the JAP crank. Suitable spacers have been made to mate the barrels to the crank cases.
Cheers
Greig
Rest assured that everything on it was dug out of various scrap bins, the chassis was already broken & damaged, the banjo axle tubes were bent and there was never a center portion. Springs were an assembly of shrapnel out of various A7 scrap bins in various people's sheds, just sized to match at the rear. Even the JAP crankcases and cranks were leftovers from motor bike guys rebuilds, hence having no barrels. The barrels came off another engine with a holey crank case & amazingly the rods will work on the JAP crank. Suitable spacers have been made to mate the barrels to the crank cases.
Cheers
Greig