Who designed and made this PSRU? Moving the prop shaft up would be a big
    help in keeping the engine totally enclosed in the cowl without bumps.
    Karibian

    Power Sport.

    Not really. You gain mostly useless space on the top of the engine
    while losing valuable volume under the engine for the cooling system.

    It is easy to mount the alternator on the cool side of the engine
    and cut down the 2nd gen water pump. If you are using an RX8 engine
    there
    is no need to cut down the water pump as it is already low profile.

    There are a very few airplanes where space at the top of the engine
    under
    the cowl is marginal. The KIS Cruiser is one of them and so are some
    versions
    of the Lancair. I forgot what airplane you are building.
    I may have a 3D layout for it so I could check your fit and space
    requirements.

    Paul Lamar ...No rotor no motor.

There are other strategies for gaining space in a more compact cowl.
I've got an RV-4, so three things I did were:
1) increase the height of the firewall 1 inch at the top
2) increase the diameter of the spinner from 12 inches to 16 inches
and
3) move the prop hub 5 inches forward. This last item will affect the
cg, but you can always move your battery to adjust your cg.

Brian Trubee

The big spinner pays off big time. All this assumes you are doing
a new cowl.

Paul Lamar ...No rotor no motor.

By moving the engine out three inches I only have about two inches from
the water pump pulley to the landing gear "A" frame and still have a
bump in the upper cowl.
I think I'm going to move it out at least another inch and maybe down an
inch.
Is the dogleg in the upper engine mount brace necessary to clear the
exhaust manifold, making it more like a bed mount? Karibian with the
Thorp T18.

Looks OK to me with out it.

Paul Lamar ...No rotor no motor.

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