aeronca champ spark plugs

jc pacquin · Post by **jc pacquin** » Tue Jun 13, 2006 20:02

Attn: Mike,Joe,Nathan and all others...I need further advice. I bought two new rem37BY plugs as advised and was going to put them in the FRONT top cylinders as they are shorter and wires would not rub cowling. Took them to airport this morning and AI said "if it were my champ and my 85-12 I wouldn't use them. They are shorter but he said they also had a longer reach into the chamber and he THOUGHT in addition they were a "hot plug". He said he would not put them in and said my current plugs were like new. He said that he THOUGHT there was an autolite plug that might do the job. Any help from you guru's would be greatly appreciated. Regards, Jim Pacquin

Post by **joea** » Tue Jun 13, 2006 20:11

Jim,

How about measuring the length of the threaded portion (and electrode) and compare it with the one you took out?

Which plug did you take out? I would contact the "plug guy" and see what he says about the difference in heat and go from there.

Above all would present it to your A&P and make sure the two of you agree. Nice to keep him on your side!

Joe A

MikeB · Post by **MikeB** » Tue Jun 13, 2006 20:33

Jim,
I asked the same question when it was suggested that I use the 37BY plugs in the front two cylinders and I was told that it was a correct plug to use (by my AI among others). They do look a little weird on the lower end, but mine have been in for over 100 hours with no problems. As far as heat range, I believe the 37BY is slightly colder than the REM 40E (lower number = colder plug). Looking at my plug chart, the reach is 1/2 inch for both the 40E and 37BY, but when in doubt your AP/AI should be able to find out for sure. As Joe said, you need him on your side.

Someone else might want to chime in here.

Mike

Paul Agaliotis · Post by **Paul Agaliotis** » Tue Jun 13, 2006 21:15

Jim,
Your mechanic may have an old application chart. I believe Champion has revised the chart to include the REM37BY for the small Continentals. Mike is correct the plug is a colder plug.
I am the original skeptic, but, I haven,t seen anyone have a problem with this installation.
Paul

Ron Babos · Post by **Ron Babos** » Tue Jun 13, 2006 21:17

jc pacquin: The reach is not a problem. You will get .0000000001 point more compression though

If memory serves correctly the 37 is a colder plug, but with the exposed tip it will work quite well with 100LL. I put 4 in my 65 and not had any fouling problems. Lots of people using them without any problems. For what it's worth the clearance on the 65 from the piston( Milleniums) to the electrode is slightly over 1/8 inch.
Ron

Nathan K. Hammond · Post by **Nathan K. Hammond** » Tue Jun 13, 2006 23:20

JC,

Everyone called it correct, the 37 is a cooller plug. And they do have a longer electrode which is also a good thing as this prevents lead fowling.

Sidebar:
They came up with this plug because the Lyc powered (O-235) C152's had a terrible time with lead fowling. By extrending the electrode (which is not a "long reach" plug, "long reach" plugs have about twice the number of threads and were made for the big Cont. and Lyc's) they were able to clear up the fowling problem.

Regardless of manufacture, the plug will be the same: Champion REM37BY is equal to a Unison UREM37BY (the "U" standing for "Unison".) Same with REM40E/UREM40E, etc...

Personally I run 37BY's in all eight holes. After 40 hours, I pulled all the plugs and found them remarkably clean and clear, with no adverse wear or characterisitcs. And remind your mechanic that the whole point of using the 37BY's over the 40E's is for clearence. If he still has questions, tell him to give me a call.

c) 770.616.2179

nkh

jc pacquin · Post by **jc pacquin** » Wed Jun 14, 2006 10:22

Thanks to all of you...I'm puttin them in. AI wont see em till next may at annual. He's 80, his girl friend is 45 so he knows plenty more than I do and must have excellent spark plug himself! Thanks again all of you,Jim Pacquin, Mayville N.Y.

MikeB · Post by **MikeB** » Wed Jun 14, 2006 11:39

Hmmm.......

Nathan K. Hammond · Post by **Nathan K. Hammond** » Wed Jun 14, 2006 12:05

JC,

I just heard about Tracy Dart, thats pretty sad. My condolences to her family and friends.

nkh

gcgilpin · Post by **gcgilpin** » Tue Jan 27, 2009 11:51

How much farther does the 37BY electrode protrude into the combustion chamber than the 40E?

I'm contemplating clearance issues when C85 pistons are used in an O200.

Nathan K. Hammond · Post by **Nathan K. Hammond** » Wed Jan 28, 2009 23:54

I'll take a look in the morning.

nkh

flyingfool · Post by **flyingfool** » Thu Jan 29, 2009 10:27

I have one lone autolight plug. it is installed on the upper left front cylinder of my Chief. The autolight plug is a bit shorter than the Champion plug. and just misses my cowling, where as the Champion plug makes contact.

I have been thinking of buying and installing the 37BY plugs in al four top plugs. But haven't wanted to spend the $100+ to do it when everything is running fine now!

Post by **joea** » Thu Jan 29, 2009 13:11

jc pacquin wrote:Thanks to all of you...I'm puttin them in. AI wont see em till next may at annual. He's 80, his girl friend is 45 so he knows plenty more than I do and must have excellent spark plug himself! Thanks again all of you,Jim Pacquin, Mayville N.Y.

Ahh, where can I get "plugs" like he has?

Nathan K. Hammond · Post by **Nathan K. Hammond** » Thu Jan 29, 2009 19:49

GC, I measured the 2 plugs (REM40E and UREM37BY) from the base of the threads to the farthest point into the combustion chamber...

40E - .60"
37BY - .80"

nkh

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