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Bobby,
Without measuring, I'm not sure if I have enough space to mount six coils side by side in a single row. But that design might work if I can mount them in two rows, three on each side.
Mark On Tue, Jan 4, 2011 at 5:25 PM, Bobby J. Hughes <bhughes@qnsi.net> wrote:
Here's one idea.
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On Behalf Of Mark
Steitle Sent: Tuesday, January 04, 2011 2:53 PM To: Rotary
motors in aircraft Subject: [FlyRotary] Re: GM Coil
Comparison
Yesterday I ordered 6 new D585 coils for my 20B. It looks like
they mount differently than the D580 coils. Does anyone have any pictures
they could share of how they mounted their D585 coils?
FWIW, the old D580 coils have close to 200 hrs on them with no failures.
I mounted them down low on the motor mount. The lack of vibration
and heat may account for their longevity.
Mark S.
On Mon, Jan 3, 2011 at 2:53 PM, Steven W. Boese <SBoese@uwyo.edu>
wrote:
Kelly,
My spark plug
life has been the same with the stock 13B coils and the D585 coils. I
have had SAG with the D585 coils also. As I discussed at the Paducah fly
in, SAG does not appear to be a spark plug misfire or failure to spark.
The effect on EGT and coolant temperatures is the opposite for SAG as opposed
to no spark with either the trailing or leading plug. I have seen
evidence that SAG may be (similar to?) preignition caused by decreased thermal
conductivity between the center electrode and the tip of the ceramic.
This decreased thermal conductivity results from corrosion between the ceramic
and the center electrode and this corrosion is accelerated by the use of
leaded fuel. There is also some evidence for decreased thermal
conductivity of the center electrode copper core as the spark plugs
age.
Steve
Boese
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Kelly
Troyer Sent: Monday, January 03, 2011 1:17 PM
To: Rotary motors in aircraft Subject:
[FlyRotary] Re: GM Coil Comparison
Good to start the year off with an
interesring and educational string !! Steve to shine
some light on Al's question about electrode erosion
and possible "SAG" reduction what
has been your experience with plug life and have you
had SAG with the D585 coil/igniters??
Kelly Troyer "DYKE
DELTA JD2" (Eventually)
"13B ROTARY"_ Engine "RWS"_RD1C/EC2/EM2 "MISTRAL"_Backplate/Oil
Manifold
"TURBONETICS"_TO4E50 Turbo
From: Al
Gietzen <ALVentures@cox.net>
Subject: [FlyRotary] Re: GM Coil Comparison
Aside from the
higher spark current from the D585s eroding the sparkplug electrodes more
quickly; do we have evidence that it will, in fact, improve performance?
Perhaps it is a cure for SAG.
BTW; my 6 D581
coils (Mounted atop my 20B) have been in use since my first engine start back
in about 2001. They have survived many hours of ground test runs where
cowl temps exceeded 150F (at times I’m sure reached 190+ for short periods);
and 200 fight hours with nary a single failure. In-cowl temps are typically
about 150 during climb-out; and generally 120-140 during cruise.
Perhaps it helps
that they get plenty of air flow (during flight) being pretty much in blast
from the rad exit. I generally run the rad aux fan for awhile after
shutdown; but I’d guess high temp is less of an issue when they are not
operating.
Al
-----Original Message----- From: Rotary
motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of
Tracy Sent: Monday, January 03, 2011 8:13 AM To:
Rotary motors in aircraft Subject: [FlyRotary] Re: GM Coil
Comparison
I highly recommend the air cooled enclosure as Steve Boese
(and I) use. This is especially important on the D581 and the stock RX-8
Renesis coils. The Renesis coils have a fairly high failure rate even on
the car. The D581 would only last a few hours at 150 F but I have
about 250 hours on them with the airbox at 120F.
Don't forget to do the
coil disable test to check for failed coils prior to every
flight.
Tracy
On Mon, Jan 3, 2011 at 10:53 AM,
Steven W. Boese <SBoese@uwyo.edu> wrote:
I have about 100 hours on D585 coils
and have had no problems with them so far. The temperature in their
airblasted enclosure is usually less than 100 degrees in flight and has gotten
up to 120 degrees during taxi.
Steve Boese
From: Rotary
motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of
Tracy Sent: Monday, January 03, 2011 8:41 AM To:
Rotary motors in aircraft Subject: [FlyRotary] Re: GM Coil
Comparison
I have a set of the D585 coils but have only evaluated them on
the bench for compatibility with the EC2/3 (they are).
I do know
that the previous version of the truck coils (D581) are not as reliable as the
D580 (Corvette) coils.
Tracy
On Sun, Jan 2, 2011 at 2:16 PM,
Kelly Troyer <keltro@att.net> wrote:
A little info
regarding the various GM ignition coils that many of us use on
our
Rotary engines with Tracy's EC2 and EC3 boxes that I
thought might be of interest
to
those that have not seen it before.............Tracy would like your comments
on the
the
apparently big performance difference between the LS1 verses the LS2
Truck
coils
and if an upgrade would be worth the $$ especially for those of us that
have
or
plan on Turbocharging in light of the higher combustion chamber
pressures.......
Kelly
Troyer "DYKE DELTA
JD2" (Eventually)
"13B ROTARY"_
Engine "RWS"_RD1C/EC2/EM2 "MISTRAL"_Backplate/Oil Manifold
"TURBONETICS"_TO4E50
Turbo
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