Hi Paul,

Finally got a moment to make that firewall outline.  This is close but
rough, we still don't have our fuselage parts joined together yet...

One file is a powercadd file the other just a plain JPEG.

Our design goal is to have the engine as high as possible for prop
clearance.  We are using 2 1/2" 16 guage pipe for our intake runners,
over the top, as usual...  I've got your remote mount water pump so
we'll need to allow for that as well as a different mounting arrangement
for the alternator, as you already know.

We bought George's 1st bell housing and would like to use that for the
front motor mounts and I'm partial to your idea for the single rear MM.

Thanks so much for offering to help.  If I can ever return the favor...

Chris Cosman
801.455.5655

I was wondering what happened to that Chris.

Can't handle the Power Cad file. The numbers on the jpg are too small to
read. What should they be? Can I put the motor mount hard points anywhere
or do you have some preferences? What is the firewall made from? Does it
have a plywood core? If so how thick? Do you have a design for a cowl
or should I do one for you? If you have a side view and a top view that
would be a start.

Can you build the motor mount or should I get a quote on the mount from
Performance Solutions?

I think I will also need a sketch of George's Bell housing with dimensions.

2-1/2 inch pipe is 2.88 inches OD. I assume you have one of Tom's 20B intake
manifolds and you are using just two of these. If so what is the center
line radius of the pipe bends as that will determine the position of the thrust line.

Also if so put a carpenter's level across the top of the rotor housing and measure
the vertical distance down to the surface on the manifold where the 90 degree pipe
bend starts. That will give me a reference number for where the thrust line can go.

Paul Lamar

BTW Chris are you sure you have 2-1/2 inch pipe and not tubing? Pipe comes in schedules
and tubing comes in gages. If tubing I know the bend radii.

Paul Lamar

Thanks for the quick reply.

The firewall will be composite sandwich (nomex or equivalent).  The hard
points for the motor mount will be located at the 'corners' of the
firewall, as close to the edge as practical and fabricated in a
bulletproof fashion.  I can get you exact locations as we progress, but
wanted to leave them flexible for FWF optimization.

Our plan for the cowl design, as of right now, is to have it exit near
the low (relative) pressure above the leading edge of the wing/fuselage
junction. This might be long enough to do one of those optimum K&M ducts
we're always hearing about.

You're right, tubing, not pipe.  I bought from that vacuum supply outfit
back east you recommended.  We do have Tom's 20B manifold and are using
just 3 runners.  The tubing is 16 guage, I'll recheck just to be sure.
Our thinking is to make the intake in 2 halves that join right at that
casting nub on the top of the rotor housings, maybe with a wiggins type
clamp.

We intend to use Jerry Hey (is he Perf. Solutions?) for the motor mount.

As for the bell housing, George, are you out there?  Do you have your
old drawings still?

Using Tracy's redrive model will work for a while since George's housing
was a drop in replacement.

I'll get more measurements to you soon.

Chris Cosman

Performance Solutions is here in So Cal next to Mazdatrix.
People are having trouble getting in touch with Jerry. Have you been in touch with
him lately? Last email address I have for him is: Jerry Hey <jerryhey@earthlink.net>

Paul Lamar
 
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