Series 1 engine swap

[nwfr1]

How do I fit a 2.25 petrol into my 86" S1? Any special bits needed? Using original S1 gearbox. TVM.

[LittleBlue88]

Ummm............i dont think the s1 bellhousing will work with the 2.25,but the last time i saw a s1 in bits was about 15yrs ago!(i was only just playing with bicycles )

Why not just change to the s2 gearbox aswell for simplicity of fitting,apart from the mountings being moved just the props would need attention

[sean f]

You will need at least the bellhousing from a S2 (fitting the whole box may be easier). The stud pattern on the series one box is wrong to fit a 2.25 engine. No need to move the box at all so props won't need to be touched.

You will also need one of the engine mounts off the orgional S1 engine, I think it is the drivers side, bolt this to the engine and it should all fit straight on the origional chassis mounts, if you don't have one it should be easy enough to make one up. A S2 exhaust will also bolt straight on and fit with no problem (well it did on mine).

I modified the front panel and fitted a later radiator so all the hose connected fine.

The only real problem I found was the engine sits quite high (or the bonnet is lower) and the elbow on the air intake to the carb pressed on the bonnet, a simple bit of modification soon fixed that.