I would like to report a broken housing due to a

hard landing.

Actually, in
my case it was a wave on the water, same

consequences.  Included are

pictures to show the details.  I use Tracy's

redrive and adapter

plate.  I
have one engine mount under the adapter plate.

The force  applied

to the
mount applies a force on the engine rear housing

right at the oil

filterboss.  My rear housing broke at the dowel

hole next to the

oil filter boss.
The new rear housing I bought is stronger in that

area, there is

more metal
around the dowel hole. One photo shows the broken

housing and where

I tried
to weld it.  One photo shows where the forces are

applied. One

photo shows
the new and old housings.

Rino Lacombe

I am a bit skeptical that a hard landing caused

this. In order to

do that
all the other ten MM bolts holding the PSRU plate

to the engine

throughthe spacer would have to deflect.  This

dowel hole has been

known to crack
in car use. That is why Mazda beefed it up in the

third gen engine.

Whattype of intake system are you using? It is a four
port engine. Is it a turbo charged four port? NOS?

Paul Lamar

Did the engine ever back fire Rhino?

Paul Lamar

Rino,

Did the bridge for your rear plyon mount sustain any
damage? (this is the single, center mount for
non-Glass Goose types). It would seem that this
relatively flexible mounting structure would have a
hard time imparting large enough loads to break the
rear engine housing.

Could you tell if the housing break seemed to be
from a compression force (upward/forward) shoving
the redrive into the engine, or a
bending/distraction force (aft displacement of the
break) from the rear mount acting as a fulcrum
between the engine and redrive?

BTW, how has your cooling system been working?  Any
other flight or engine performance you'd like to share?

Scott Gettings

Or torsion. Torsion is the usual failure mode as that dowel
pin is subject to all engine torque. Detonation can also
cause these kinds of failure.

Paul Lamar