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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?
I believe the
mystery is solved...............Apparently "AR2692" is a typo
error
and "AR2592" is correct..............Check out the
link below............Full of info.....
Kelly Troyer
"Dyke Delta"_13B
ROTARY Engine
"RWS"_RD1C/EC2/EM2
"Mistral"_Backplate/Oil Manifold
-------------- Original message from "Kelly
Troyer" <keltro@att.net>: --------------
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
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"....
--
Kelly Troyer
"Dyke Delta"_13B ROTARY
Engine
"RWS"_RD1C/EC2/EM2
"Mistral"_Backplate/Oil Manifold
-------------- Original message from Lynn
Hanover <lehanover@gmail.com>: --------------
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
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