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Rock Auto.com On Tue, Jan 4, 2011 at 4:06 PM, Bill Bradburry <bbradburry@bellsouth.net> wrote:
Mark,
Care to share your source and price??
Bill B
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Mark Steitle
Sent: Tuesday, January 04, 2011
3:53 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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