BMW V8 dry sump from billet

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AdeV:
Thanks David, all encouragement gratefully received :poke:

Today was supposed to be a day off, but family duties were all finished by 3 o'clock, so I figured I'd get some shop time in... Not much to report, after lots of careful measuring, plenty of :smart:, quite a lot of :scratch:, a little :bang: and some :coffee:, I figured if I milled all but 20mm of depth, 15mm in, I'd get clearance for the cap bolts AND wouldn't break into any of the drain holes - at least two of which are right next to the fixing holes. Not so clever, Mr BMW.... should have thought about that & moved those mounting holes...

No matter - in the picture the front edge is cut down, and I'm working on the back edge. The cut is some 500mm long, 15mm wide and 38.5mm deep - thank goodness for power feed - and a mill rigid enough to do the backside cut as a climb cut (although it hardly is - the 16mm roughing cutter was taking a 14mm by 0.200" bite, not sure it's still a climb cut at that width?

Reckon I'll turn it around so I can do both front & back under power as well; I have to be careful with the front as the outermost drain hole is less than 15mm from the front of the sump - so one of the mounting bolts is going to have to be longer than all the rest.... well, unless I counterbore it to take a short bolt, I don't think that will foul the pipe...

More tomorrow night hopefully.

Divided he ad:

--- Quote ---No, damn it all.... the "muscle" was actually pneumonia, and (feeble excuse) it's been a bit nesh in the shop recently...
--- End quote ---

Holy four little asterisk's :jaw: :jaw: :jaw: You ok now though eh?

Sorry for the post and run.... I'm just so very busy these days! I did however get a whole 2 evenings in my workshop last week and I actually made something for myself!!!! Not going to tell you what but I might post it in the year long thread it started in! :lol:

Good to see this moving at such a rate too.... Looking great :thumbup:

You never know someday soon(ish) I might actually get over there to see it (and yourself) in person again!

Not for a few weeks mind.... Gearbox out again next week! :doh:

Right, I'll be back on in a day or 50 and expect progress :whip: :)

Ralph.

Brass_Machine:

--- Quote from: Divided he ad on November 21, 2011, 02:46:58 PM ---...Holy four little asterisk's :jaw: :jaw: :jaw: You ok now though eh?
...

--- End quote ---

That cracked me up! :lol:

SPiN Racing:
Beautiful progress!!

Makes me happy I have all Mazda Rotaries.. and a Dry Sump means flat plate on the bottom of the engine :clap:

AdeV:
Cheers guys! And yes, I'm pretty much back to normal now, I can still feel "something" if I take a really deep breath, but it's fading every day... I've got a followup appointment in January, so I guess they'll tell me then if I'm still alive or not...

Roight, onwards.... I managed to grab a couple of hours tonight, so I finished off the two short edges. I had planned to do them under power, but laziness got the better of me - I didn't want to have to dial the lump in again, and since I hadn't moved it, all my datum points are still valid - so I have to crank the y-axis a bit, I can manage that....

So, after about 90 minutes, I was all done:

And the front edge:

The big sticky-outy bit that's left is the result of a mistake I made some months ago.... when I misplaced the front drain hole by what turned into 3mm. Because it's so close to the edge, I can't mill in the required 15mm to clear the cap bolt heads; so that one bolt will have to be a long one. I've fixed my drawings now, so any additional sumps won't have that ugly lump up front...

So I figured, let's have a photo with the back plate bolted on:

And, as it wasn't quite 9pm, I figured I might as well mill out the relief holes, which allow you to get a spanner to the bolts above (which, of course, would be entirely unnecessary if one took the gearbox off first):

With all four done, I called it a night.

Now that all of the clamps are off the main surface, I can take the final skim off the bottom. Then it's back on the rotary table to round off the front edges, then onto the angle plate to slope the bottom. Finally, I'll cut some shallow fins into the bottom to help with cooling, and the very last operation will be to drill & tap two more holes in that upright, for the gearbox to bolt into... and then it will be finished!!!

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