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Yeah, that crossed my mind. Baring a clear and certain advantage, I likely will stick with the standard recommended plugs even though I do have a number of housings laying around. Since they are kicking us out of the hangar for a couple of months to redo the roof, if'n anyone wants the parts to several disassembled 13b and are passing through Houston, they may like a new home <g>. They are great for research.
All the best,
Chris
George Lendich wrote:
Chris and Bill,
It's handy to have an old housing to screw new type plugs into
before you actually put them into the working engine.
It's then easy to see how far the plug extends by looking from the
inside of the housing.
George (down under)
So, I am guessing by this thread that it is ok to use the none
shrouded stock NKG plugs. I have not looked, but now assume that
the more standard type automotive plug fits even with it longer
electrodes extending further out.
Cpl. Christopher Barber, JD
Badge 330
Bellaire Police Department
5110 Jessamine
Bellaire, Texas 77401
713-668-0487
713-662-8289 fax
CBarber@BellairePolice.com
------------------------------------------------------------------------
*From:* Rotary motors in aircraft on behalf of Kelly Troyer
*Sent:* Wed 7/8/2009 6:44 PM
*To:* Rotary motors in aircraft
*Subject:* [FlyRotary] SAG- Spark plugs 2592 or 2692?
Bill,
You are correct................You have to look up the AR2592
plugs by part number............This plug
is actually used in some early Chevrolet and Chrysler Big block
engines for racing..........
--
Kelly Troyer
"Dyke Delta"_13B ROTARY Engine
"RWS"_RD1C/EC2/EM2
"Mistral"_Backplate/Oil Manifold
-------------- Original message from "Bill Bradburry"
<bbradburry@bellsouth.net>: --------------
Kelly,
I don’t see a call out for the rotary engine in the Autolite
info…???
Bill B
------------------------------------------------------------------------
*From:* Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] *On Behalf Of *Kelly Troyer
*Sent:* Wednesday, July 08, 2009 3:27 PM
*To:* Rotary motors in aircraft
*Subject:* [FlyRotary] SAG- Spark plugs 2592 or 2692?
Jeff and All,
I believe the mystery is solved...............Apparently
"AR2692" is a typo error
and "AR2592" is correct..............Check out the link
below............Full of info.....
http://www.autolite.com/pdf/Autolite_HP_Apps.pdf
Kelly Troyer
"Dyke Delta"_13B ROTARY Engine
"RWS"_RD1C/EC2/EM2
"Mistral"_Backplate/Oil Manifold
-------------- Original message from "Kelly Troyer"
<keltro@att.net>: --------------
Jeff,
I have never found a trace of a "AR2692"............Lynn
which is correct ??...................
--
Kelly Troyer
"Dyke Delta"_13B ROTARY Engine
"RWS"_RD1C/EC2/EM2
"Mistral"_Backplate/Oil Manifold
-------------- Original message from Jeff Whaley
<jwhaley@datacast.com>: --------------
Lynn’s email referenced 2 part numbers … Poor folks
race with Autolight AR2692 and … In the picture, left
to right is the Autolight AR2592.
So which number is it correct? 2592 or 2692?
Jeff
*From:* Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] *On Behalf Of
*Kelly Troyer
*Sent:* Wednesday, July 08, 2009 2:35 PM
*To:* Rotary motors in aircraft
*Subject:* [FlyRotary] SAG- Spark plugs
Lynn and Group,
I checked my local "Auto Zone" and they claimed to
be unable to get the "AutoLite"
AR2592 sparkplug...............Checked "Rock Auto"
(Link below) and they have them in
packs of 4 for $2.69 (each plug)...........Ordered
8 of them for $21.52 + $5.47 shipping
but "AutoLite" has a rebate offer of $0.50 per
plug for up to 16 plugs until Nov. 30,2009
for copper core plugs (rebate link
below).............To find the sparkplug do a part
number
search (AR2592) , Add the manufacturer (AutoLite)
, Then use "all" for the part group
because if you use "Ignition" and "Sparkplug" for
part type it will say "No part found"....
FWIW
http://www.rockauto.com/catalog/raframecatalog.php?a=G-Store
http://www.autolite.com/rebate/pdf/spark-plug-09.pdf
--
Kelly Troyer
"Dyke Delta"_13B ROTARY Engine
"RWS"_RD1C/EC2/EM2
"Mistral"_Backplate/Oil Manifold
-------------- Original message from Lynn
Hanover <lehanover@gmail.com>: --------------
In a message dated 7/7/2009 3:22:56 P.M.
Pacific Daylight Time,
bbradburry@bellsouth.net
<mailto:bbradburry@bellsouth.net> writes:
Steve,
I hope Lynn chimes in here. He has seen a
lot of plugs under a lot of
conditions. They look pitted to me. There
seems nothing wrong with your
conditions. The only thing on the list
would be too lean.??
Someone is out there writing up a great
response right now! :>)
Bill B
That plug has been too hot.
Stock Mazda plugs are rather cold in heat
range by way of the guards around the shell.
The electrode runs a bit hotter than normal.
Plug heat ranges are determined by how far
down the shell the porcelain touches. The
longer the heat path, the hotter the plug.
Using car plugs in the aircraft application
seems to be asking for trouble. In the car on
the freeway you use 2,600 RPM and 1/2
throttle, maybe 24 to 28 HP. Not much of a
challenge for a spark plug. But there is the
driver who will jump into his 95 twin turbo in
LA and run out to LasVegas at full tilt and
expect to still have an engine when he gets
there. And usually he does. So, if I was to
use a street plug in an aircraft, I would use
the 93-95 twin turbo plug, whatever that is.
The aircraft application, less the 100LL fuel
problem, is clearly a cold racing plug with a
conventional gap or close to it.
Years ago when we started racing rotaries,
Champion said to use the N-57G Fine wire
center with gold paladium plating and a
conventional ground strap. About 20% of the
center wire is exposed in an end view.
The N-57G and similar are discontinued and the
N-82 series replaced it. The shell is thinner
and the porcelain is wider. Same fine wire
center, no gold anything. 20% of the wire
exposed in an end view.
Both worked fine even with points and a
Kettering coil.
Poor folks race with Autolight AR2692 end
style and small porcelain just like the N-57G.
Full size center wire, conventional strap, but
100% of the center wire is exposed in an end
view. Actually used by NASCAR and the local
circle track people, and stocked by Autozone
and others. About $5.00 a box of 4. They work
fine. I raced them one weekend, no problems,
but we were getting the NGK plugs for free so
I stuck with them.
The NGKR6725-115 stamped on the body actually
means that the heat range is 11.5 not 115.
$25.00 each.
50% of the center wire exposed in an end view.
Free for some Rotary engined competitors.
Retracted gap (the whole thing is inside the
shell. Fine wire center and fine wire ground
strap. Ice cold. Long body so it is easy to
install and remove in the rotary.
I grind off those eyebrow things above the
plug holes so I can use any plug I like. And
any 5/8" plug just goes in so easy. Most heat
ranges are available in the 5/8" shells.
Rotaries do not like high heat range plugs.
The housings crack across the leading plug
hole. Over time a complete set of radial
cracks form.
In the picture, left to right is the Autolight
AR2592, Champion N-82, NGK R6725-115, and
Champion
N-57G.
Lynn E. Hanover
Warning: This e-mail transmission, and any documents, files or
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