BMW V8 dry sump from billet

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AdeV:
Jason - I'll check out 5/8 BSP I think; I should be able to get taps for that before Easter...

Meanwhile, another frustrating evening on the lathe... It started off OK, I chucked up & centered a 2.25" length of 1" ali bar, and turned 0.75" down to about 20mm (small enough to fit in an ER32 collet anyway).

Then, pulled the 4J off, cleaned out the spindle (mucky pup it was too), popped in the 3MT sleeve, added the collet chuck and - woah - LOADS of runout... over 0.2mm at the chuck body. Damn.

Investigations have shown that the 3MT sleeve is the culprit, with around 0.1mm runout right at the neck of the internal morse taper (it's probably worse than that, the dial gauge was at an angle). Humbug. Now I need to make a new one of them. I'm glad I've got this one, mind, the external taper doesn't conform to any documented standard that I can find... looks like I'm going to be busy over Easter...

CrewCab:
As ever Ade ........... great work and dam good entertainment :beer:

--- Quote from: AdeV on March 30, 2010, 02:11:49 PM ---I'll make 'em out of Stainless if I have to...
--- End quote ---

Got to say with the wall thickness etc my first thoughts were that ally was probably not the best choice :smart: ............ but just my 2c worth of course, it's easy to be a critic from afar ain't it :bugeye:

keep up the good work mate :bow:

CC

Divided he ad:
The Wirral.... I was there repairing a door this afternoon :lol: Only about 45 min's away :thumbup:

My threads are M12x1.5 I could probably re-thread your one to my specs, but would that thread be an issue to yourself? Have you got a drawbar for your lathe of that thread?

Anywho, I'll measure it all up and you and I can have a chat about it tomorrow :thumbup:

I know everyone is saying good stuff, calc's and all about these hose fittings but.... As long as your making them I assume your heading for one of these styles?

Hopefully you can make out a pictorial form of what Jason was saying???

Sorry about the true C-o-C quality... It's 00:40!!

Just make sure the wall of your fitting is thick enough to take the pressure of the tightened clip too! Steel would be my choice! (I know, sucking eggs! But I'd rather say it than not :thumbup: )

Ralph.

AdeV:
Ralph - the thread doesn't bother me at all, I've no drawbar; and if I need one (if the Plastic Hammer of Doom isn't hard enough to scare the chuck into place), then I'll make one for whatever thread I've got...

Your first C-o-C is exactly what I'm aiming for. The threaded end screws into the sump (and is purely there for safe keeping). The rubber hose is then jubilee'd onto the smooth sticky outy bit. It doesn't need much of a "nose", probably 1mm will be plenty.

I'm reasonably sure I can fit a 5/8" BSP screw thread into my chosen pipe layout at the sump end; it's a fair bit bigger than the 3/4 BSF I've been using, so there should be plenty of meat left (even using ali) to prevent snappage or stress fracturing - plus, since the pump & sump don't move relative to each other, and since the whole lot's under a vacuum in use, I can't see masses of stress in that area anyway. With the threading at a temporary impasse, I'm not convinced that a Loctited slip fitting wouldn't hold up.

WRT material; the fittings on the oil pump are aluminium. Two of them are mega-substantial hose fittings of some incredibly expensive variety; but the third is a plain spigot, 16mm ID, 18mm OD (or thereabouts), and that's not crushed. And again, as this is the vacuum side & not the pressure side, slightly loose pipes will suck themselves further on, rather than getting blown off (sure - very loose pipes will fall off, but that's another story), so one doesn't need to clamp them murder tight.

I hear you on the steel thing, though. I may make a spare set of mild steel fittings, just in case. But not until after I've finished the rest of it off...

Jasonb:
You really should have a drawbar, the side pressure from the turning tool can make the taper come loose, the last thing you want is your collet chuck dropping out while you are machining something.

Jason

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