Rem37by Plug Length

[grandmanancy]

I Saw On A Previous Thread, That Somebody Used Rem37by Plugs
To Avoid Tear Drops On Top Cowl.
I Can't Find The O.a.l Of These.
Can Someone Tell Me If They Are Shorter Than The Rem40e
Plugs Currently Installed In My C-65?
I Did See That Rem37by Is Recommended ,if You Have Excessive
Lead Build Up On Plugs.
Thanks For The Help.

[astjp2]

Re: Rem37by Plug Length

The plugs 1/2" shorter from where it is seated in the cylinder to the plug opening for the wire....Tim

[grandmanancy]

Re: Rem37by Plug Length

thanks for the info on plug lengths,
i will order a set tomorrow, i should be able to eliminate tear drops
by using these.
thanks again,

grandmanancy

[VictorBravo]

Re: Rem37by Plug Length

I am just now RE-INSTALLING teardrop / blister fairings after trying to use the "Ercoupe Cups" with varied results.

I had some new Champion M-40-J racing plugs (short, unshielded) left over from my F-1 days. I bought the Ercoupe Cups from Fresno Airparts, and then had to spend MORE money to have them machined to fit the new harnesses.

I went so far as to bend the spring from the ignition lead downward, and then snap the spring firmly around the top of the plug contact so it could not slip off. There is NO WAY the spring could pop off of the spark plug.

I flew it on the 65HP engine about 25 times, and had at least three times when it would not run well on that (top) mag. Twice I taxied back from the runup area with a passenger because it was not safe to fly.

When I finally got my 85 installed, I used the Ercoupe Cups again, and on the first engine test run it would not run well on that mag. The mags were fresh overhaul Eisemanns, with almost new harnesses.

Forum member L-2 Gary was kind enough to tell me that these little Ercoupe Cups were not worth the effort, lost sleep, and safety risk. He suggested I take the short plugs and aluminum cans out, put the long plugs back in, and safety wire the cowling down for a test run. Ten minutes later with no other changes, it ran perfectly.

I am putting the cowl bumps back on as we speak. Unless someone can tell me what I did wrong and show me how the Ercoupe Cups are safe to use, I'm going with the long plugs.

Nancy if you want to take a chance with the Ercoupe Cups, you can buy mine for the same price I paid Fresno Airparts ($28 each), and you will save the $50 worth of machining it took to get them to fit the standard new harness ends. Matter of fact if you pay me with Paypal today or tonight I'll let 'em go for $25 each because I need Paypal money to pay some eBay fees

Let me know.

[flyguy]

Re: Rem37by Plug Length

Bill,
Our resident old-timer tells me that arcing to the lid on the cup happens sometimes with that kind of setup. He said the solution was to put hi-voltage insulating material on top of the plug before installing the cap. Makes sense to me. I am using C-26 unshielded plugs with my cups and am not having any problems.
Darryl

[jCandlish]

Re: Rem37by Plug Length

Bill,
Our resident old-timer tells me that arcing to the lid on the cup happens sometimes with that kind of setup. He said the solution was to put hi-voltage insulating material on top of the plug before installing the cap. Makes sense to me. I am using C-26 unshielded plugs with my cups and am not having any problems.
Darryl

Yep, I've had that. I put a cotter pin in the sidewall of the cups to ensure that the caps leave a sufficent air gap.

[dewhitaker]

Re: Rem37by Plug Length

Bill,

Yes, you need to make sure the cap to the shielding cup does not screw down and contact the top of the plug. I used insulating material glued under the cap and also safety wired the cap so it will not rotate.

Over 100 hours now problem free with my cups. One thing I just learned from a mechanic in our area, is he takes the harness and cuts the factory end off and puts a different one on. This eliminates the machining work needed on the Fresno shielding cups.

For those who may want to use the shorter RM 37 plugs, you may or may not have the clearance needed. The fit of the cowling varies from airplane to airplane, you will just have to try it and see if it works for you. For others, who may wish to use the shielding cans, it is an attractive option if done correctly. Search the Forum for my posting pictures on how we did ours.

With tongue in cheek..... Friends don't let friends fly with cowl bumps!

[VictorBravo]

Re: Rem37by Plug Length

With tongue in cheek..... Friends don't let friends fly with cowl bumps!

Touche'...I guess I deserved that

I got tired of the issues with the Ercoupe cups and threw in the towel. An old, gray, wise IA told me to just stop playing around with the cans because it was just un-necessarily risking a problem, so I threw in the towel and put the blisters back on. So far I'm happy, but I'll be happier when I have the cowls all repainted.

[flyguy]

Re: Rem37by Plug Length

David brings out a point that I wasn't sure enought to mention before. I notice there are different size ends (3/4 in. ?) available on plug wires at the plug ends (from suppliers.) Would that be a fitting that would match the Fresno AP cans without modifying them?
What size/thread are those cans as bought?

It never occurred to me to screw the can caps down far enough to have them lock. Mine came with cotter pins thru the top edeges to lock the caps with maximum clearance.

Question on the 37by plugs. Would they work on the top back two cylinders w/o bumps? Would get rid of dealing with 2 cans at least.

DC

[lfries]

Re: Rem37by Plug Length

I just went thru new ignition wirres. I believe the cups are 11/16 and the
wire couplings are 5/8. I did send my old wires hoping they would use the
couplings, after dilscussing this with them, but no luck. I purchased a 5/8 dye, correct thread. The IA filed the cups down enough so that the 5/8 dye would cut threads. Worked very well. I loaned the dye out once and assume it worked OK. I have cups on all four top cylinders and have never had a problem.

[flyguy]

Re: Rem37by Plug Length

11/16, Thanks. Wonder what that fit? I have to check some info I have on custom harness ends.
Re my question on the back two cyliners. I see that is answered in the affirmative elsewhere.
DC

[VictorBravo]

Re: Rem37by Plug Length

11/16, Thanks. Wonder what that fit? I have to check some info I have on custom harness ends.
Re my question on the back two cyliners. I see that is answered in the affirmative elsewhere.
DC

Mine are for sale/trade, if you're interested, and they have already been machined for "normal" leads.

[VictorBravo]

Re: Rem37by Plug Length

Congratulations to Greg Guy, the soon-to-be new owner of a ready to go set of Ercoupe Cups ! Mine have been sold to Greg, thanks.

[Forrest Barber]

Re: Rem37by Plug Length

Whew! that problem is solved. WE have used Taylorcraft cups, Ercoupe cups, tin foil cups, blisters, bumps and all sorts of things all work good if installed correctly. I agree with Dave Whitaker, cut off the factory ends of the wires and run them into the plugs with the spiral wire ends. HOWEVER is this a minor or major alteration? hmmmmm will the FAA check into this before or after the accident. Well back to mowing and running what is left of our airport.

[grandmanancy]

Re: Rem37by Plug Length

received new set of rem37by plugs the other day.
the top half is about 3/8 shorter than rem40e plugs, currently installed.
the bottom half, electrode end, is approx. 3/8 longer than rem40e plugs.
i am going to have my a/p check for clearance between plug and piston
before i install the new set, doesn't look like a lot to me.
does anybody know what clearance i will end up with?
thanks for your help.
grandmanancy.