We had a oil system failure this morning running up the TTC engine. A screw came out of the engine oil pressure pump part of the dry sump pump. It doesn't take long at 150 psi to piss oil all over the air plane and the ramp.

One would think paying $50,000 for
this engine the screws would have been safety wired.
I bought 2 dozen NAS binder head 10-24 screws from Aircraft Spruce for 27 cents each.

You must look at every detail in your home built aircraft and consider what would happen if that detail (what ever it may be) failed. Make a list of every nut and bolt in the entire aircraft. That is what Van's Aircraft  does.

We also cut the air going into the cooling system down to a slot
1.5 inches high by 20 inches wide and the engine temp went
all the way up to 140 F  at 8300 RPM.   ROFL.

We took the oil cooler off as well and the oil temp went up as well.
We don't need no stinking oil cooler when carrying 4 gallons of Mobil One.

More on this latter today when I get the logged data out of the Motec.

BTW the gap in the iridium RX8 plugs is .021" inches.

Paul Lamar

Paul,
It is acceptable to use automotive parts in an experimental, but everyone must keep in mind to adapt standard aircraft practice to those parts...... your screws being a great example!
Keep it safe..... self locking nuts, cotter pins or safety wire......
Larry Childs


Here is the test run screen captures of the data  log.

The water temperature increased to 143 F but could go higher with a longer
run and the small rad opening. The oil reached 156.4  F with no oil cooler.
That too could go higher with a longer run at 8000 RPM and more boost.

Note with the small prop the engine will do 8300 RPM with hardly any manifold
pressure. The manifold pressure never got over 55 inches of HG at 8300 RPM
with the small prop.

Paul Lamar

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