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Toot

Written by Lewis on 2024-11-11 at 18:10

I have a week off, so back to what I should be doing, which is finding out all the ways a BMW gearbox doesn't fit in a Rover P5 and what to do about it.

First thing was finding out that my engine needs to be moved starboard a few mm (that or my subframe is nowhere near straight, but I'll just pretend that's not the case). That'd make no practical difference on driveline angles, but I believe in chasing mm's everywhere I can.

I'll remedy this before setting up tomorrow.

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Descendants

Written by Lewis on 2024-11-11 at 18:23

Also, what I don't have is any space to use the OEM GS6-53DZ mount; not without cutting the middle of the rear crossmember out and relocating it backwards by like half a foot. I don't mind this, because after acquiring an OEM mount I have concluded that it is bollocks.

I understand why mounts need flexibility (it's not just for NVH, it's to stop components shaking themselves apart). But I can definitely improve on whatever this is.

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Written by Lewis on 2024-11-11 at 18:44

Cue like an hour of staring at it to work out what I'm going to do. I could very easily fabricate a new mount that I can get to right now, with the subframe out of the car. That is not how I will be installing and removing the gearbox; I need to get to it from underneath.

These four bolts CAN be accessed from underneath (I tested), but it's fiddly and I'd rather not.

I have an idea (that's the squeaky hamster wheel you just heard).

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Written by Lewis on 2024-11-12 at 17:52

OK, here's one half of how I am solving this. I think it's quite nice and compact.

This is going to use exactly the same Powerflex bushes that I'm using for the re-engineered rear leaf spring bush. That and using whatever tube, angle iron and plate I had kicking around meant that I could have this part today and not some other time. :)

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Written by Lewis on 2024-11-14 at 15:26

Here's the other half. I realised I could re-use the original mounting holes in the subframe for the rear mount (but bored out for an M8), so I frankensteined my original gearbox mount with whatever random shit I had kicking around. It works!

That means another milestone: (stunt) engine and box now mount into the subframe. Other than running brake lines, tidyups and a bunch of things I probably forgot about, that's the subframe fabrication Done. :)

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Written by Basmitharts on 2024-11-14 at 17:33

@lewis Congrats 🎉

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Written by Lewis on 2024-11-14 at 18:38

@Basmitharts I've surprised myself tbh.

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