Here’s a few thoughts about swapping from a VP2040 to a D1-30:
- your MS2
gear could work on the D1-30 engine, but it’s not a direct bolt up. The flywheel housings are different. The 2040 has a ‘flywheel housing’ and a cover plate which bolts to it. The MS2
gear then bolts to the cover plate.
The D1-30 has a one piece flywheel housing with an SAE 7 ( Borg Warner) bolt pattern on it. You will need an adapter plate to go from the MS2 to the Borg Warner bolt pattern, similar to the plate shown in the
photo. This adapter plate is the same as the one used by VP on today’s
saildrive engines.
- the D1-30 engine will be supplied with a flywheel torsional damper with a spline suitable for Hurth based gearboxes (10 spline). This damper will have to be removed and replaced with one to match the MS2 gearbox, as also shown in the
photo. This can be removed from your 2040 engine or sourced new.
- as I haven’t done this exact swap, I can’t state that the offset between the gearbox spline and the torsional damper spline will be perfect, though I’m inclined to think it will be workable. It might require a spacer or two to be perfect..
-The 2040 engine was rated 40 hp @ 3600
RPM and the D1-30 is 30 hp @ 3000 RPM. This might cause a little mismatch in
propeller load, though not as much as one might expect. Looking at the prop load curve for the 2040 shows that at 3000 RPM the 2040 prop absorbs close to 30 hp, which means it will be a fairly close match for the D1-30. You might need to add or remove a bit of
pitch from the existing prop for a perfect match.
Hope this info helps with your pondering..