NO COWL BUMPS with C-85

[Kerbs]

Jim, Makes sense if you are doing new cowling. I reused my cowling so I was a little more limited in options. If I were doing new cowling I would pursue no bumps if possible as well.

[Jim Herpst]

Kerbs,

Exactly why I want a professional to fit my cowling. All that beautiful new metal work from the Wenglarz would go to waste I am afraid otherwise . I will see about him forming bumps as needed .

[Kerbs]

When I did my C-85 upgrade with the luscombe exhaust, I uses ercoupe cups as many have mentioned. I am still having fitment issues with my cowl. (I know every plane is a little different, mine is just crazy tight with the the 85 in it.) I am going to be installing bumps on the cowling within the next week. I ordered some PA-11 cowl bumps from Wag. They are the smallest I could find and I think should work pretty well with the Rem37 plugs and shielded ignition. I can try to take a few pictures after we get them on, hopefully early next week. the Ercoupe cups are slick if they fit. The shielding worked great. They just are too tight for my cowl unfortunately.

[Jim Herpst]

Thanks, yes we are going to check out a no bump option. As well. The 0200 may fill it up a bit more but any way will check to see if we can go without the bumps.

[Mark Bowden]

Jim, found a close up of the cut out option.
If you zoom the rear cutout is just for the bend in the harness lead. So if you had a shorter plug you could probable eliminate that rear one. Maybe put an Ercoupe cup on the front plug and no cut out or bump is needed.

IMG_0916.JPG

[Jim Herpst]

I have a new uscombe 8 e exhaust to arrive on friday. Yes that is my understanding. The aeronca exhaust require a bump in the lower cowl not the Luscombe. Ha don't want my o200 plus hp sounding like an air knocker any way...lol.

[Rigdon66]

Jim I forgot to add that no other modification was made to the lower cowling.

[Jim Herpst]

Super pics!!. Thank you

[Rigdon66]

I used the Luscombe exhaust with a slight modification to the cabin heat outlet. The tear drop bumps made somewhere back in the 60s.
I have been really happy with the Trig Ty91 as well.

[Jim Herpst]

That's what I did on a friend's T to get home from Nevada. It works fine! I still have the top cowl here somewhere. The nicest ones I ever saw were just hammer and dolly'd into the top cowl. Very graceful and not much of a bump. Wish I'd had a way to get pictures!
John

I am thinking my metal man can do a simple bump . I am really striving for clean and and orginal to an extent look with as much of today's technology where safety comes to play. I am on to a firm game plan finally with use of an 0200.with Luscombe 8e exhaust just ordered.
and yes shielded ignition Getting rid of the trunk latche cowl which was installed after a 1961 nose over. It should never have had that cowling as an early 46 build. Clean look IS also a key...to a point of practicality. So not as orginal perhaps but hopefully a safer better performing ship.

[N96337]

That's what I did on a friend's T to get home from Nevada. It works fine! I still have the top cowl here somewhere. The nicest ones I ever saw were just hammer and dolly'd into the top cowl. Very graceful and not much of a bump. Wish I'd had a way to get pictures!
John

[Jim Herpst]

That is a different twist...and keeps it clean. I am going to talk with my metal man as he is doing the install of the new cowel that the Wenglarz made for me.

[Mark Bowden]

Jim, an alternate to consider is what Dad did on the restoration in '99. No bumps but cutouts for the top plugs.
It has and still does run oil temps 50 deg F over ambient. Engine was overhauled at 2000 hours So it "made" TBO. I have 550+ hours on the new motor in same configuration.

Attached is a ramp photo, zoom and you can see the holes for the top of the plug and lead. While it looks "different", I feel it looks better then bumps. Perhaps as Tim mentions use the 37BY on the rear and only one hole for the front plugs. Just something to consider, of course there is a bit more heat with a C-85.

IMG_20160618_150547400 (2).jpg

[astjp2]

You can form the upper cowl so it doesnt need the bumps and use a REM37BY plug...

[Jim Herpst]

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

You had pictured in this post what appears to be a BC12 or BC12 D with an 85 and what looks to be Champ Exhaust. I see the original gasculator stil on the mount. Besides for the extra hole did you otherwise modify the lower coweling? I notice only one heat muff and the perhaps is where the problem arises