[DML] Porsche 915 in a DMC.

[Marc Levy <malevy_nj@xxxxxxxxx>]

I am posting this because it has long been accepted
that the Porsche gearbox is somewhat of a "drop in"
replacement for the DMC trans.

Racing to get my conversion done before DCS06, I spent
this entire past weekend trying to make space and
position the engine and transmission in to the car
properly.  This is not an easy task because there is
not real reference to measure off of....  But that is
another discussion!

Anyway,  My donor transmission came from a Porsche
911, probably 1983 or 1984.  Based on advice from
those who have used this transmission before me, I had
high expectations that getting this transmission to
work would be the easy part of the job. So far, there
has been no "easy part" of this project.

So for anyone else thinking of doing this, I will
share what I have learned.

The distance from the input shaft to the drive flanges
on the Porsche is NOT the same as the DMC.  In order
to keep the drive flange aligned properly with the CV
axle, the entire assembly must be moved toward the
back of the car.  This presents some problems with
clearing the stock DMC frame.  It makes me wonder if
those who have done the 915 conversion before me have
steep angles on the CV joints, which will work but
likely cause premature failure.

After I got that problem somewhat solved, I went to
bolt the axles to the flanges.  I had been told by
others they "bolt right up".  Murphy says "no way". 
Today I did some investigation on the drive flanges
and found that Porsche had a number of different
styles.  The one that seems to match up are the larger
(110mm) 6 bolt flanges (there are multiple sizes). 
These flanges were in use on the early 915
transmissions up until about 1975, when they shrunk. 
The 110mm was then used again on the Porsche 930 (911
Turbo), and on the 1986 Carrera.  In 1987 they went to
a G50 box, so the 915 was no longer used... However,
the G50 box will probably bolt up.

Long story short, if your using a 915 gear box in your
DMC look for one out of a Porsche 930 or 1986 Carrera.
 The early (pre 1975) boxes will work too, but they
don't handle as much power.  Meanwhile, I am on the
lookout for a set of flanges to change the ones on my
915 box.





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