Enfield Hatz subframe angles

[Sphere]

Until now I have always assumed that the gearbox (side/bottom) in an Enfield is perfectly perpendicular/parallel to the Earth surface, and welding the gearbox plate to the motor mount plate should be done with a 90 degree angle.

Is this in fact true? I would like to go ahead and make the subframe, but I can't really measure it myself since I destroyed bearing races of the front forks

[Diesel Dave]

In short the answer is yes!

It can vary according to tyre fitting

All the Hatz conversions seem to have the primary casing tilted upwards at the front - I suspect this is because the height of the crankshaft from the bottom of the motor.

Dave

[Sphere]

Hrm, strange, I've taken a look at Yanmar vs. Hatz 1B40 drawings, and I thought the height was one of the few traits that was similar. Maybe Altmann also has a tilted case then.

I can't look at the Yanmar drawings now, but for reference I added 1B40 vs. China clone from wiltec.info. Both seem to measure 155mm perpendicular from the baseplate to the centre of the crank.

[Sphere]

Here's some pics of the mockup phase of the subframe. It has been subject to hours of careful coffee sipping and cookie eating with Nanko. OK, well, not hours, but you get the idea. I owe him a great deal of gratitude for offering his excellent workmanship and his amazing in-house shop.

[Sphere]

Here's a picture of the intended position for the headsteady. It is actually a piece from a Honda, don't tell the Enfield purists
You can see the front tube has a knack, otherwise the engine would not slide/fit in.

[Sphere]

Pictures of the finished subframe. At the front it's welded to the downtube, which has been bent outwards slightly and rewelded, then elongated. The engine is mated to an original gearbox, without using a Taurus shaft and it seems fine like that. Negligable tilting to the right, but nothing close to problematic. Perhaps some modification is needed of the foot change lever, but time will tell I guess.

When stood on the centerstand both wheels still touch the ground, I remember the rear wheel clearing it, but maybe I'm mistaken. Again I'm not bothered.