unshielded spark plugs

[freightpilot27]

what is the best UNSHIELDED spark plugs to use in ercoupe cans on a C-85?

[M Towsley]

Re: unshielded spark plugs

Bob,

Don't know if they are the best, but I use M-41's with the cups.. The C-26's are also compatible, (I think if I remember correctly), but you would have to sell your first born to get a set. I have seen some C-26's of late on Ebay, new, though.

[Guest]

Re: unshielded spark plugs

Hi Marty,

Are you saying used C26's are hard to get?

I think i have box of them. Maybe I struck gold!

Dave

[M Towsley]

Re: unshielded spark plugs

They can be difficult to find. For a long time I was looking for them and couldn't find them. Now more and more are showing up but are not cheap. Here are links to what is on Ebay right now:

http://www.ebay.com/itm/One-Champion-C-26-Aircraft-Sparkplug-Vintage-NOS-Piper-Stearman-Champ-A65-/250929868490?pt=Motors_Aviation_Parts_Gear&vxp=mtr&hash=item3a6c95eeca

http://www.ebay.com/itm/Set-4-Champion-C-26-Aircraft-Sparkplugs-Vintage-NOS-Piper-Stearman-J3-A65-/250929865593?pt=Motors_Aviation_Parts_Gear&vxp=mtr&hash=item3a6c95e379

http://www.ebay.com/itm/RARE-NOS-Original-Champion-C-26-Aircraft-Spark-plug-many-vintage-aero-engin-/120811471637?pt=Motors_Aviation_Parts_Gear&vxp=mtr&hash=item1c20ecc315

[Guest]

Re: unshielded spark plugs

Thanks Marty,

I found 9 used ones with very good electrodes in my shop.

I am not going to toss those!

Dave

[M Towsley]

Re: unshielded spark plugs

Dave,

That's pretty much the general attitude of those who have them. Some of the guys on here are doing the same.

[1938BF50]

Re: unshielded spark plugs

I was running C-26's on top. Worked great to eliminate the bumps. Had nearly 40 troublefree hours on them before the unscheduled landing. I scrounged a couple coffee cans full of used C-26's over the last couple of years. Most cleaned up real nice. Axs a bonus, I got about 100 copper washers in one can. I beadblasted and annealled them all. Work perfect.

[M Towsley]

Re: unshielded spark plugs

I was asked in a PM about this so for anyone else interested. Here is some info regarding using the Ercoupe Cups I put on my plane this last summer. Doesn't eliminate ignition noise completely, but helps. I have a couple of other things to do but just getting the shielded plugs on the bottom helps a lot.

Link: http://vb.taylorcraft.org/showthread...t=ercoupe+cups

[freightpilot27]

Re: unshielded spark plugs

thanks guys..

anyone using C27's?
The C26's are not approved according to the TCDS.

[Forrest Barber]

Re: unshielded spark plugs

We use them all here ; you are correct the C-26's should have been taken out of service . Rumor has it that they still work just fine !