Hi Jim,

    Thanks for the update. Would you consider selling a raw casting
    or two for an experiment? Some of the guys want to try something
    like this. It would be a hardened and ground sheet of 4130
    or some such steel alloy. Roughly .090 thick as a first guess.
    It will be locked in place by the main bearing housing bolts
    at the center and the rotor housings at the periphery. Perhaps
    a stud or two in a blind hole in the center housing. Heat sink
    grease can be used between the steel and the aluminum to
    enhance heat transfer. Perhaps the steel can be porous chrome
    plated instead of hardened and ground which works great for
    the rotor housings.

    Paul Lamar ...No rotor no motor.

Hi Paul,

    I suppose we can sell uncoated housings.  They are .005" thin/side,
so you would have to remove more of the face to add a steel plate.  I
believe you will have trouble keeping the steel flat on the aluminum due
to cyclic heating in combustion areas.  I think you will also be
challenged to find a way to bolt down the inner area without subverting
oil sealing.  If durability is the goal, I think you are guilding the
lily.  If heat transfer reduction is the goal, go for it - but you may
be introducing durability problems from the steel plate (sealing, moving).

Jim Mederer

Hi Jim,

I share your concern regarding the steel liner. This is why I am using a CI
wear plate in my AL housing for the single rotor. This wear plate also has
the water guide ribs and additional intermediate attachments to the aluminum
section.
However, as Paul said, we will try and see if and how it works.
The picture is showing the water side of the insert.

Richard Sohn
N-2071U

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