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Hey, John, Good to hear. Don't worry about
the oil injection holes - you won't need them {:>) (Sorry, but can't let
Rusty have all the fun).
I'd be most interested in the results with your new
turbo. I think its fairly clear from recent discourse on the topic (as
well as a couple of incidents) that the A/r housing for the stock Mazda turbo is
just too small for sustained aircraft use at high rpm. The modifications
of your new turbo appear increase your A/r (or at least causes the same
effect) by diverting more exhaust gas around the turbine blades. Also the larger
compressor should also help keep the air temps down and airflow up.
Its my opinion that the stock turbo being water
cooled (which most aircraft turbos are not) really should do well as an aircraft
turbo - provided the A/r is considerably increased and a larger compressor
wheel is used AND modest boost pressures are used.
Be good to see you in the air again.
Best Regards and good luck
Ed Anderson
----- Original Message -----
Sent: Tuesday, October 26, 2004 9:39
PM
Subject: [FlyRotary] N96PM makes noise
once again
It's
been quiet here lately. Time to liven things up a bit.
I'm
happy to report that my engine is once again making noise. Well, it was making
noise before, but now it's good noise.
I
just started the rebuilt engine and taxied around on the ramp in the dark
for 5 minutes or so. It seems to be running very well. I definitely need to do
a bit of tuning, but it's very smooth and responsive.
I'm
not sure if I mentioned this but there were a number of things wrong, over and
above the damaged seal and rotor housing, any and all of which might help
explain some of the problems I've had since first running the engine over a
year ago.
1.
The rubber end plugs on the seals were missing - i.e. never
installed.
2.
One of the end seals had 30 thou clearance when it should have been 2
thou
3.
(This one is embarrassing). Bruce asked me if I was running premix. When I
said yes, he asked why I'd unplugged the oil injection holes when I removed
the engine. What injector holes?, I asked. Yep. Believe it or nor, the oil
injector ports (next to the primary injector holes) had been unplugged since
day one.
Taxi
testing and runups tomorrow.
John
Slade
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