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Cox Engine of The Month
September-2021
crankbndr's

"Cherry Bomb" .051 engine

More info on this engine!




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Post  KariFS Tue May 10, 2016 9:42 am

This is being offered at a local auction site, it is said to be from the '60s, in good condition, very little if at all used. Obviously missing some parts. Starting at 25€.

I know next to nothing about K&B's. I surfed to the Mecoa site but the K&B engines there looked different. Sceptre flight site has a review of a Series 70F R/C engine that looks a lot like this one.

How is the spare part availability for these engines and is there a C/L venturi setup and a muffler available? Would it be a worthwhile modification?

Here's a couple of pics:

Tell me about this K&B 40 please Image18
Tell me about this K&B 40 please Image19
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Post  Cribbs74 Tue May 10, 2016 11:10 am

I run one in a full fuse Twister that is set up for CL. The engine runs strong and likes wide tip props. Does a pretty good CL stunt run.

It should be a ringed engine and the ring can be replaced to restore compression. I'd say the price is relatively high for what it is.

A venturi can be made or found and an ST needle would fit. I have an aftermarket Venturi on mine and an ST needle.

No muffler provisions on the case so you would have to use a strap on. Looks like that one was RC at one time.

Ron


Last edited by Cribbs74 on Tue May 10, 2016 11:13 am; edited 1 time in total
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Post  OVERLORD Tue May 10, 2016 11:10 am

Kari, the engine looks a lot like this engine:

Tell me about this K&B 40 please 8011pe10

This picture comes from the Mecoa site. It's model number 8011

http://www.mecoa.com/kb/parts.htm

There is an exploded view and a parts list.

Lieven


Last edited by OVERLORD on Tue May 10, 2016 11:11 am; edited 1 time in total (Reason for editing : spelling)
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Post  dht7788 Tue May 10, 2016 11:24 am

These engines aren't worth much. You can get one on eBay for $30 or so

I have an rc carb for it if you're interested. Maybe a muffler too
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Post  KariFS Tue May 10, 2016 12:06 pm

OK, Thanks guys. Maybe I'll pass for now. It has been listed and re-listed a few times already, and since it would need additional "investments" of maybe 30€ Or more for the venturi and nva, I'll probably be better off with another, complete engine that might show up sometime.

Dht, Thanks for the offer. If this one becomes listed for a low starting price I would probably be interested.

Thanks again Hand Shake

Now I'll just need to talk myself out of bidding on a sweet and apparently never run orange Cox Baja Bug lol!
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Post  Oldenginerod Wed May 11, 2016 1:46 am

I have three of these and most of the parts are still available. All came as parts engines and I've managed to assemble two runners. As mentioned, they're not worth much but still a very good engine with a good reputation. They seem well made and it's handy being able to reverse the crankcase to place the exhaust on whichever side you prefer. Mine are both the early Torpedos, but the same engine. Later ones came with a different front housing, crank & prop driver, as well as mounting provision for a muffler. They come in either ringed or ABC. First time I tried to run one I was pretty disappointed with the compression and couldn't get it to start easily. I found that this is fairly typical of a dykes ring. The ring has little tension to seal and relies on compression pressure forcing the ring out against the liner. One little blast with an electric starter and the thing bursts into life and runs quite powerfully.
I also have a couple of K&B sportsters, a .20 and a .28. I think I paid less than $20 each and they can still be purchased new at around $90. While they are cheap and seen as a low-end "throw away" engine, mine are the nicest running engines I own. Start easy, idle and transition beautifully and run really quiet with the original muffler. They are AAC. Aluminium bore & piston, with the piston being chromed.

My ultimate project would be a 337 Skymaster with the .28 in the front & .20 in the rear. Engines are identical externally.

Rod.
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Post  Oldenginerod Wed May 11, 2016 1:55 am

There's currently this one.
Torpedo .40- ebay

And this.
Another ebay Torpedo
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Post  Mark Boesen Wed May 11, 2016 1:50 pm

Back-in-the-day....(mid eighties) the K&B .40 R/C was a hot rod and the most popular Q500 engine out there, as well as boat, ducted fan, FAI, etc.! But, soon the imports took over and K&B became a lesser brand, much like Fox, and both probably somewhat deserving.
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Post  KariFS Wed May 11, 2016 11:48 pm

Rod, Mark, thanks for the additional info... You make this sound more and more tempting Smile

I also remember reading about K&B's in the '80s, way beyond my means at the time, but they had the "hot rod" reputation, especially in speed or pylon races. Never saw one in person. Since this one is not very expensive, I may make an offer, especially if it is "practically unused" as the seller says.

The ones on eBay get expensive when the shipping is added, and both of them show the eBay program that is not very famous for actually getting the engines delivered Sad

Is there a manufacturer or a supplier for venturis and especially needle valve assemblies suitable for this engine?

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Post  Ken Cook Thu May 12, 2016 2:06 am

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Post  Oldenginerod Thu May 12, 2016 4:20 am

I found the venturi but no information on what NVA to use. Do these guys use a standard NVA such as a Super Tigre one, or does the venturi come with one? If it does it's real good value at $10.
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Post  Ken Cook Thu May 12, 2016 1:06 pm

Jim can supply you with a needle. They're similar to a Tiger needle but he also has at times offered needles and spraybars typical to a Randy Smith needle which is all stainless body and brass collets with a Teflon insert inside the collet. More like a museum piece rather than a needle valve. RSM Distribution aka Hobby Products can also provide a aftermarket needle. Mecoa also provides the old standby K&B universal spraybar and needle valve for $18.50

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