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Todd wrote:
Hey Guys;
Sometime ago (years?) somebody posted a picture showing their
LS1 coils all
mounted in a row, attached to a piece of aluminium.
Sorry; I didn't catch this when it originally
came through, but I finally backed up to it in the deleted items after some of
the follow-on messages got my attention. I believe the mount you're
talking about is the one I have on my 20B installation. Picture
attached.
Regarding all the discussion about failing because of
temperature and not mounting on the engine, etc; autos, of course have the coils
mounted in the engine compartment, and more specifically, the Corvette LS1 has
these coils mounted on the engine on the valve covers. All these same
autos have the exit air from the radiators going into the engine compartment; so
they anticipate operating temps in the say 150 to 170 F range. Most coils
don't have diodes in them, but the LS1 coils do. My data on solid state
devices indicates that these temp levels have little effect on failure rates
(except maybe germanium diodes for high currents). Manufactures generally
will not insure operation of the diodes for continuous temps over 150C; but
that's 300F. I agree with Tracy that there is a temp where the failure
rate may be 10 times higher than at ambient, but at what temp? And 10
times higher than what? If the failure rate at ambient is 1/100,000 in
1000 hrs at ambient; I don't care if it is 10 times higher.
In my particular installation, the coils are in
downstream blast from the rad air, which I'd expect to less than about 150F for
flight regimes other than maybe during climbout. With some louvres in the
cowling I don't anticipate much high temps on the ground either; but then I
don't know because my plane isn't flying yet. I went through all this before I
decided to mount them there, but it is just my opinion.
The mount makes for a nice compact installation, and
short plug leads. The threaded standoffs for the bolts are already on the rotor
housing.
If you you're interested in this mount I still have one
on the shelf. Contact me at ALVentures@msn.com
Al Gietzen
The
picture may have
been to show an engine mount, but they were in the
picture. I have searched
all know rotary web pages as well as my own files
and cannot find this
picture.
If this was yours or you have this
picture, or even any other mounting
ideas, I'd really like to see it. I
have a few ideas, but I really would
like to see that
again.
Thanks
S. Todd Bartrim
Turbo 13B rotary
powered
RV-9endurance (FWF)
C-FSTB
http://www3.telus.net/haywire/RV-9/C-FSTB.htm
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