NO COWL BUMPS with C-85

[astjp2]

You could always get the cowl bumps from univair and use those.

https://www.univair.com/ercoupe/view-all/415-40428-ercoupe-spark-plug-fairing/

[Rigdon66]

I think it was around January…
When Ryan Johnson installed them he said he had to loosen the engine to get the mag gear into the back case…otherwise no issues I believe

[Jim Herpst]

I ordered my Slicks through Wag Aero and they fit my -12.

Wow tight as I thought! How long ago did you purchase them?

[Rigdon66]

I ordered my Slicks through Wag Aero and they fit my -12.

[Jim Herpst]

Be careful with harnesses. Aircraft spruce sells a slick harness that has about a 1/2" metal sleeve where it comes out of the mag cap. It wont fit because it hits the firewall on my 65 short mount. Might be different on an 85-12

Great What does work???.. clearance is much worse with a short mount and -12 anyone here?????

And thanks to Woody for another heads up!

[Woody]

Be careful with harnesses. Aircraft spruce sells a slick harness that has about a 1/2" metal sleeve where it comes out of the mag cap. It wont fit because it hits the firewall on my 65 short mount. Might be different on an 85-12

[Jim Herpst]

Yup. Big difference. I will probably go with the slicks as I am hearing here that their standard leads have a lot of give in the end for the short shielded plugs. Just hope they are not rubbing the cowl as described above

[Woody]

Jim,
That makes a big difference. The Bendix s4ln or rn for a 65 are great mags. I have them on the clip wing and slicks on the bc12D.

[3Dreaming]

I don't have the picture anymore, but I've posted a picture before of some we put on a clipwing with a C-90. They were a short teardrop shaped bump. Only for the front plugs, with BY plugs and a Slick harness with shortened center nut. The slick leads will bend and take up less room than any 90° plug lead that you buy.

[Jim Herpst]

Thank you Scott. Ok those here running shielded wires what angle degree are you using for minimal bumps if you have bumps. Some of the bumps I have seen are huge!

[Scott]

Here it is:

https://vb.taylorcraft.org/forum/taylorcraft-technical-topics/engines/8236-ercoupe-cups?8001-Ercoupe-Cups=&highlight=ercoupe+cups

[Scott]

The wires just need to have tight bends at the plug ends. I think they're 70 degrees but don't quote me.

Yes the rear plugs would be the REM37by and are shielded type.

The front plugs remain the stock unshielded type, but they fit in the cups. The lead attaches to the side of the cup, and I believe you'll need to re-cut the threads.

There's an extensive thread on here somewhere that provides more specific information.
S

[Jim Herpst]

It's possible the short plugs will fit in the top rear cylinders. Fresno still sell the erocoupe cups that should fit for the fronts. $45 ea last time I looked. May even be less costly than paying to have someone fabricate the bumps.

By the way, I was/am concerned about the ringing in my ears too. I broke down and parted with my annual flying budget and bought a Bose A20. Makes a huge difference, primarily because you can hear at much lower volume, so the ignition noise goes down too!

Scott,

I m going to have to figure all this out and not end up with Rube Goldberg set of wires. short plugs non insulated front but use ercoupe cups. Rear insulated but still short plugs correct?

[Jim Herpst]

Jim.
I have had the old lunch box mags and they re great. They will throw a 1" spark on test bench. HOWEVER when the coils get hot they will not crank. I swaped mine out 30 years ago. My neighbor has a good friend in magneto business. He asked him to rebuild some sf4's and he said throw them away. I will send you some s4rn's. That was from a well respected mag overhaul facility. Someone told me fresno air parts had some new coils for sale. My bet is they are 50 years old and have the same insulation. If they work for you that's great. I got tired of trying to hot start.

Tom

Tom,

I may have provided the wrong numbers of the mags I can purchase. They are definitely NOT the old bendix Scintillating lunch box mags. .I can understand the coil issue on those . In fact Eisman has the exact same problems.

I am referring to new style Bendix mags. Hence my question re coils.

I will follow up here with the numbers.

Ok

The numbers of the mags I can get are two s4ln-21...both impulse and both the newer bendix mags.
Thanks
Jim

[Scott]

It's possible the short plugs will fit in the top rear cylinders. Fresno still sell the erocoupe cups that should fit for the fronts. $45 ea last time I looked. May even be less costly than paying to have someone fabricate the bumps.

By the way, I was/am concerned about the ringing in my ears too. I broke down and parted with my annual flying budget and bought a Bose A20. Makes a huge difference, primarily because you can hear at much lower volume, so the ignition noise goes down too!