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RE: [FlyRotary] Re: oil return location?
As a
follow up to this; I just measured the vertical height of these oil ports. The
lower drain port on the RD-1A is 1" lower than the injection oil port. The RD-1A
still needs an outlet tube fitting. If you use a 90 degree or a "T" (to connect
the upper drain) this will lower it an additional 3/4", so your oil would have
to flow uphill 1 3/4". If you use the Turbo oil drain, the bottom of this drain
pipe is exactly the same height as the centre of the RD-1A outlet fitting. Still
not very attractive, and you still have to route it around the hot exhaust.
I know that Tracy doesn't have any
concrete proof that oil shouldn't be returned below the oil level, and logically
it shouldn't make a great bit of difference, but I do agree with him here and
think it's worth the effort to install a return port above the oil. If there was
some performance or economic advantage to experimenting with a lower return
port, but I don't see any other than a few hours of time
saving.
My earlier comments about attempting
to drill & tap in place while removing chips are definitely not to be taken
as a reasonable alternative to removing the engine. As Rick pointed out the
chips would be very hard to remove, however I should also have suggested that I
would also flush the pan several times with oil. I do feel however that any
chips would never make it past your filter, although they must go through the
oil pump to get there. Still, I am in no way endorsing this, if you have any
alternative.
Me, I pulled one of my engine
sub-mounts off and pulled the oil pan. I know you really don't want to do it,
but it looks like there is little option. I will include a couple of pics of how
I did mine.
This is something that should be
addressed during a rebuild, so if any listers are still early in their
project... PAY ATTENTION -- you will need to return oil from your PSRU no matter
which one you buy. (well, except for Perry Mick;-)) (and Ken) Add a drain port
and just put a plug or cap on it until it is needed. I'm surprised that Bruce
doesn't already do something like this on his engines. Even on his video, in the
short section he has on aircraft use, he should add mention of this during any
future edition.
S. Todd Bartrim
Turbo 13B RV-9Endurance
C-FSTB
http://www3.telus.net/haywire/RV-9/C-FSTB.htm
"Whatever you vividly imagine, Ardently desire, Sincerely believe in,
Enthusiastically act upon, Must inevitably come to pass".
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