Paul,
    Because I do not know how to add dimension lines to a photo I
have enclosed a picture of my practice firewall. The dimensions are:
A) 22.50" between upper engine mounts
B) 20.25" between lower engine mounts
C) 17.25" between upper / lower engine mounts
D)  9.75" from upper mounts to top of firewall
E)  4.75" from lower mounts to bottom of firewall
F) 12.00"
G)  5.00"
H) 28.25" top of firewall to corner
I) 30.25" firewall at widest point inline with top mounts

For a Lyc. 0-360 180 hp the plans call for an 11" long engine mount.
I have measured two installations:
A) an 0-360 that is 33" from firewall to prop flange and
B) an 0-320 that is 33.75" from firewall to prop flange

You will just have to make your best guess at mount length. I will
probably build a "corrected" 2nd mount after weight and balance.
This is a n/a engine with a dry sump oil system using a 2.85:1
redrive and approx. 220 hp.
Shoehorn what you can in front of this firewall. If I have to modify
the firewall dimensions some what that is not a problem. I will be
building a custom cowl so put radiator and engine air inlets where
you think best along with exhaust louvers if possible.
Did you consider doing a part 1 and part 11 cooling seminar at
Oshkosh? If I am going to have any problems with this installation I
think cooling will be it, I need to learn all I can about the
possibilities.
Thank you very much,
Randy


All looks OK. 33 inches firewall to prop flange is tight.
Might have to make that longer. I am assuming you are using
Tracy's PSRU. I will also need the position of the thrust line
and down thrust angle if any and side thrust angle if
any.

No OSH is a problem for forums. I am a lot more comfortable
at Sun N fun.

--  Paul Lamar ...No rotor no motor.

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Paul,
 According to the prints the thrust line is the centerlines of the
top longerons which is 5/8" above the top engine mount centerline.
There is no down or side thrust angle. The vertical fin is offset
3/4" and I thought the rod end adjustable rear mount would allow some
up/down thrust adjustment. Yes, I am using Tracy's PSRU.
Randy

-----------------------
OK good I will go from there.