david mccandless wrote:

Hi Paul and George, I notice you have the engine mount bolts in shear in
this rendering, not recommended with steel bolts into aluminium. It
leads to radial cracking around the bolt holes. Better to cast in a
shoulder, or mill a shoulder if there is enough metal, so that the bell
housing rests on the engine mount interface and have the bolts stressed
only in tension. I did note that a 3-4mm steel plate could be mounted
INSIDE the vertical faces to spread the vertical loads with the mounting
bolts passing thru the alum. side faces in a sandwich grip. Nice job
there George.

Ref Plugs Up, I thought Ed Anderson's installation disproved all that
hokem about oil paths and cooling. A local guy here raced a 12A "plugs
up" in a boat some years back and had none of these problems.  (I admit
cooling a boat engine in water should be simpler). With turbo
installations, it can make turbo oil return to the sump a bit awkward.
Any comments Ed ?

Ref End Housings. Paul, I know you are busy with the Dyno, and water
pumps etc but any news on the ?  Dave McC

We got the shoulder Dave. Take a close look at this picture.

On the subject of plugs up. Why ask for trouble when there is absolutely
no advantage in running it other than the way God and Mazda intended?
Are you trying to start trouble Dave? :) If you just want to be different
trying running it up side down :)

I would not hold my breath on the alum/steel end/center  housings. The
machine shop that was doing the work dropped the ball on stuff he was

doing for me.

George is a good pattern maker. Perhaps we can talk him into doing
the pattern.

Paul Lamar

Thanks Paul !

David,
I did listen mate - I might add putting them on caused more problems than I
want to discuss, I hope your happy!! because of the problems they will have
to milled-off to square.

BTW Paul, My machinist is a Pom and one of his last jobs in England was
cutting the blades for jet engines, his brother is also a Pilot.

I squared-up the MM sides on the Bellhousing to day, progressing slowly but
nicely.

Any progress on those MM drawings, I can start on them soon !!
George (down under)

As I understand Aussie, Pom is a derogatory term :)

I'll work on them in the next day or so. Tied up on this water pump
right at the moment. They are simple and can be tig welded out of plate.

Paul Lamar
 
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