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Aug 15, 2011, 10:33 PM
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williame3590's Avatar
I have to dig out some more engines this thread is great!

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Aug 15, 2011, 11:00 PM
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earlwb's Avatar
Well one way is to have a lip at the top of the cylinder sleeve, the aluminum head is machined slightly oversized to fit. You then freeze the head and heat up the cylinder and then lightly press the head into place. let it cool off and it ought to really be on there good. As when the engine is running the head will heat up and expand too.
The lip can be shallow as is the recess it fits into on the head too.

But yeah staking normally means someone drilled holes and pressed in some pins around the circumference.
Aug 15, 2011, 11:04 PM
Registered User
earlwb's Avatar
You go for it Wiz. They are pretty good running engines. I already have two, so I won't be competing for it.

Anyway, did anyone here win that auction for the COX Twin 0.040 engine that was on Ebay? That looked to be a good runner too. It looked like it had a reed valve for the intake. But it looked pretty nice though.
Aug 16, 2011, 02:49 AM
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Here is an abbreviated engineering definition of "staking" which I found on Google -

"Staking is a method of securing parts by pushing surface metal together with punch and hammer. It is a process usually employed to secure two parts together. Threaded parts that draw up to a certain critical point are sometimes staked to maintain that position. The advantage of staking is that it holds parts together in a final position".

Pretty vague huh ?
It would appear that "staking" is a generic term for any method of attaching a cylinder head, other than by threads (a la COX), or with bolts.
Last edited by Twin-Stack; Aug 16, 2011 at 05:08 AM.
Aug 16, 2011, 08:20 AM
Bill Mohrbacher, MECA Fox Guy
G WILLIE's Avatar
Regarding Herkimer OK engines, the staked on heads were really staked on cooling fins. The cylinder was blind bored with the combustion chamber an integral part of the cylinder. A small diameter spud was machined on the top. This spud was drilled and tapped for the plug. The head cooling fin assembly was slipped over this spud and the edge of the spud was upset (staked) to firmly hold the fin assembly to the cylinder. Of course the spud's diameter was large enough to not disturb the plug's seat.

There was actually an accessory head made for the Brown Junior that was a set of head cooling fins, but retained by the spark plug, not staked.
Aug 16, 2011, 07:31 PM
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Another very interesting site for engine lovers -
Aug 16, 2011, 08:01 PM
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When I was trying to find the definition of "staking", I learnt that Ohlsson & Rice engines used a novel method for securing their cylinders to the back half of the crankcase. Variously described as "spot welding", "attaching" etc. this process apparently involved pouring molten alloy around the base of the liner, through 2 holes in the crankcase. These holes were then sealed off with alloy plugs. Thus, if you wanted a new piston & liner for your O & R, you had to take a new half crankcase as well, as the 3 components were not sold separately. The photo's below show two different O & R engines with the "plug weld." BOB
Last edited by Twin-Stack; Aug 17, 2011 at 01:28 AM.
Aug 16, 2011, 08:38 PM
flyinglog's Avatar

Bwf 2,5 s

Hello !

Here we have two examples of " BWF 2,5 S " , the early version with the silver Head and rare RC carb and the later version with Venturi.
They were made between 1983 and 1991 in east germany.ABC Piston/liner and double Ball bearings. The cylinder head dont go into the liner , it is screwed flat on it. Not so vinage engines, but never produced again and they are Very good looking.

There was also a "r" and "rr" version with high silicium Piston, for up to 36000 u/min

The "S" was/is used mainly for CL and FF . spin up to 26000 on ground without pipe. also good RC engine, when you got the carb.
Last edited by flyinglog; Aug 16, 2011 at 08:45 PM.
Aug 16, 2011, 08:48 PM
Time for me to Fly...
Mr. Wiz's Avatar
Interesting engines! They have rear exhaust but then a side muffler. I assume that some also used the rear exhaust with a tuned pipe?
Aug 16, 2011, 08:51 PM
flyinglog's Avatar

Picco / OS Hybrid

Here is a Picco / OS .60 hybrid
cylinder and P/L is Picco, Crank and front housing is OS . Dont know anything about the carb. Dont know if its Powerful, but looks cool and runs.
Aug 16, 2011, 08:53 PM
Bill Mohrbacher, MECA Fox Guy
G WILLIE's Avatar
The chopper link naturally omitted the Fox Eagle 4 heli engines. Here is the Eagle 4 .74 heli:
Aug 16, 2011, 08:58 PM
flyinglog's Avatar
Yes , the BWF was designed for use with pipe. the muffler was for the hobby pilot and gives you a lot of trouble during engine installation, it fits nowhere.. But you have to open up the exhaust for pipe use(just the S versions).

Last edited by flyinglog; Aug 16, 2011 at 09:05 PM.
Aug 16, 2011, 09:04 PM
flyinglog's Avatar
so , the last one for today explains itself :

(mvvs 2,5)

Regards , Sebastian
Aug 16, 2011, 10:13 PM
Closed Account
Some interesting engines from auctions past, these are (from the left) -
A sectioned TMN 12 sleeve valve
Unknown 40 Serial #84
A K&B/TWA 15 from 1972 Serial #105

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