It's 2 3/8 inches measured with a gauging caliper inside the recess of
the intake hole from the outside of the moulding.
--- In firstname.lastname@example.org, "holdenwaca" <holdenwaca@...> wrote:
> Thanks for taking the time to write all that. It helps. As it
> happens, I have both engine mounts and both sets of cowls. I am going
> with an IO-360 so I want to use the longer mount, which is on the
> plane now. I am selling all of the "short" stuff, and I just want to
> make sure I pair it all up right. What I meant by larger was the grey
> cowl seems to have a deeper from part in front of the air scoop. This
> is, I assume, what you were talking about the area needed for the
> forward mounted injector. My part numbers are the same, too...for
> both parts. That's what's thrown me off more than anything. If it is
> not too much trouble, can you tell me what the inlet hole cutout size
> is on your short set? Thanks so much!
> --- In email@example.com, "christopher_skelt" <cskelt@> wrote:
> > Will,
> > By "larger" do you mean "longer?"
> > The answer may be "it depends on your engine mount, engine and
> > possibly prop and spinner." My 320 FB was shipped in June 1990 and
> > came with grey cowling halves with score marks about two inches
> > forward of the aft edges. The top half is P/N 150T serial number 1115P
> > and the bottom is 150B serial number 2007P. They are dated November
> > 1989. Their overall length is 36 1/2 inches.
> > The distance from the front of the firewall to the aft side of the
> > starter ring is 30 3/8 inches with an IO-360 M1A/B engine from
> > Lycoming delivered a few months ago hanging on a black painted
> > dynafocal type 1 mount that I received from Lancair in December 1994
> > once it became clear that I wasn't going to use a conical mount
> > engine. This is a "short mount" which I understand is about three
> > inches shorter than the "long mount" that some newer LNC2s have. I
> > will need to trim about half an inch off the aft edge of the cowling
> > halves to fit to length with a Hartzell prop with the spinner from
> > Lancair. The score marks happen to line up with the front of the
> > joggles around the firewall, so if I were to trim to the marks there
> > be no way to attach them to the front fuselage.
> > These cowling halves are therefore too short by a few inches if you
> > have the long mount.
> > The scoop on the lower half is moulded for a bottom mounted
> > carburettor or injector. With a forward mounted injector you need to
> > fit a modified scoop. It's described in the manual and the scoops are
> > available from Lancair.
> > Hope this helps. Let me know if I can make any more measurements to
> > clarify.
> > Regards, Chris.