What the heck is this cylinder from?

Twin exhaust slit with the unmilled top fin are somewhat rare especially if they don't have any plier marks. Not sure why this was done. Possibly an oversight.

Cribbs74 wrote:I think it's a sure start cylinder. Nothing overly special. I have several of those and if I ever use them I will grind flats into it.

Not sure why they were designed that way, but they are a pain like you mentioned.

Possibly an Estes money saving technique? It's definitely not a good design. You practically have to destroy the thing to remove it.

I think these date to the mid/late 70's IIRC. I think these came out after the mesh/stainless slit cylinders that are somewhat rare. Maybe Mudhen or Mark knows more.

I'm not really sure, I guess because I have more interest in the older stuff I've collected more info. I know the dual slit type exhaust came out late in '78. It does look like a dual port? Is there a number on it?

Mark Boesen wrote:I'm not really sure, I guess because I have more interest in the older stuff, I've collected more info them. I know the dual slit type exhaust came out late in '78. It does look like a dual port? Is there a number on it?

No number at all. It's truly and oddball cylinder.

While trying to identify a motor I have I came across this thread. The cylinder appears very similar to the one being discussed, twin slot with twin bypass, no SPI, no wrench flats and complete with plier marks. My knowledge on Cox engines is extremely limited (emphasis on extremely). I have been through the Cox Engine Handbook and I am unable to find a match. Any idea what model it is? Cheers Dave

I've got 2 of them, both on Babe Bees and I'm sure that the engine I had on my Cox F-15 CL plane had such a cylinder as well.

Lieven

Thanks Lieven. I'll hunt through the site to see what I can find about the anodising. The only black motors I've seen so far are in the killer and widow line.

Dave, you might have misunderstood. I got 2 of those slit cylinders without flats. Not that black engine you showed. The crankcase, is that anodised or painted? On the picture it looks so shiny.

Lieven

Davenz13 wrote:Thanks Lieven. I'll hunt through the site to see what I can find about the anodising. The only black motors I've seen so far are in the killer and widow line.

That looks like it could have been a Banana. If not, it's probably just an engine assembled from parts someone had lying around.
https://sites.google.com/site/coxenginecollection/banana-049

Don't you hate it when you type a long winded reply, hit the send button and it just disappears into the void that gobbles them up never to return. Oh well start again
I thought, since I had a complete engine with the same type of barrel as being discussed, it might help and also identify the engine I have as to what model or fitment. I bought it about a month or so ago for a few dollars so if it's a lemon no big deal. Most recommend denatured alcohol as a cleaner but nobody here has heard of it so I googled it to find it is also known as methylated spirits which every service station, hardware store, supermaket etc stocks and I have heaps of it my workshop. The engine has been soaking in meths (what we call it down here) for a couple of days and has had a brush and clean which is probably why it's shiny wow we just had a faily substantial earthquake, I was waiting for the crash of breaking stuff but all seems ok though a bit of stuff on the floor. First reports are saying 6.9 about 40 miles away. Maybe I'm not supposed to finish this post.
Anyway moving on It looks like anodising to me and it''s probably a bitsa but I'll stick it on the shelf with the others where it can take it's chances with the next shake. (I'm going to cut and paste this just in case it disappears again)

Wrapping the cylinder with an old leather belt 2 times then pliers to remove works too. This is what I use on these cylinders.

Just ran into another one. Has zero plier marks because it's never been removed(except by me). I used a rag folded over twice and then again to surround the cylinder. Then channel locks and some muscle. Still mark-less(excep for a scratch from what I suspect was from a starter spring based on the location. Is this an estes black widow? Or did they have a specific cylinder they used?