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What engine is this???

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What engine is this???

Post  coxxoc on Fri May 04, 2012 8:18 am



Hi guys,

I purchased this engine on ebay 6 months ago and it was advertised as a Tee Dee .049.
I don`t think so???....is it a,
(1) Killer Bee .051 manufactured in 1996 ?

OR.....(2) Product Engine .049 manufactured in 1973 ?

OR.....(3) Product engine .049 manufactured in 1976 ?
They all look similar and they all have horseshoe back plates. I took back plate off and
checked reed and it was copper star shaped. It also came with a 6D x 2P cox prop.

Sorry about the photo being a bit blurry, it`s a scan off my printer.

Cheers! Mr G Cool
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Re: What engine is this???

Post  Admin on Fri May 04, 2012 8:51 am

Well, it sure ain't a Tee Dee! Very Happy
...and it isn't a Killer Bee.
It has a hex "SnapStarter" on it so it isn't from the 1970s
What # does the cylinder have on it?

If it wasn't built from parts by someone else, it is likely a product engine from the 1980s. I'll wait for someone to chime in with their Cox Engines Handbook the includes all the product engines in it.

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Re: What engine is this???

Post  Ivanhoe on Fri May 04, 2012 8:59 am

I certainly hope you didn't pay a TD price for it!

I agree that it's most likely a product engine
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Re: What engine is this???

Post  andrew on Fri May 04, 2012 9:25 am

+1 for Jacob's and Wilf's post.
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Re: What engine is this???

Post  SuperDave on Fri May 04, 2012 9:52 am

To the uninitiated there is considerable confusion between TD (Thimble Drome) and TD (Tee Dee) both names being associated with Cox products over the years.

The distinction is an imortant consideration in any purchase of Cox products.


Last edited by SuperDave on Fri May 04, 2012 11:27 am; edited 1 time in total
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Re: What engine is this???

Post  Ivanhoe on Fri May 04, 2012 10:24 am

SuperDave wrote:To the uninitiated there is considerable confusion between TD (Thimble Drome) and TD (Tee Dee) both names begin associated with Cox product over the years.

The distinction is an imortant consideration in any purchase of Cox products.

I would think that, by the time this engine was manufactured, "Thimbledrome" was no longer being used in engine descriptions.
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Re: What engine is this???

Post  RknRusty on Fri May 04, 2012 11:00 am

Is that not a Killer Bee backplate? He said it had an old copper type reed, but in the picture it looks like it might have a black plastic reed retainer flange peeking out between the crankcase and backplate.
Does it have an open gap under the piston when you rotate it to TDC? Is there a hole in the crank pin?

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Re: What engine is this???

Post  microflitedude on Fri May 04, 2012 11:33 am

RknRusty wrote:Is that not a Killer Bee backplate? He said it had an old copper type reed, but in the picture it looks like it might have a black plastic reed retainer flange peeking out between the crankcase and backplate.
Does it have an open gap under the piston when you rotate it to TDC? Is there a hole in the crank pin?

It also has the short brass needle with black cap that came on the .051.

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Re: What engine is this???

Post  coxxoc on Mon May 07, 2012 12:35 am

Hi people,

Thanks for all your replies!..But I think I`ve found the answer to what engine it is?
It`s amazing what you can find when you dig deep enough.

Here`s what I found:

Now The Killer Bee .049 (Cat # 340) Manufactured 1995-1996.
The killer bee was a real good attempt at making a fast reed valve .049 engine from
information that had been learned over the years of racing and competition. It had
a tapered cylinder with SPI and lighter piston similar to the tee dee, a stronger
balanced crankshaft and a new reed valve shape. They had a yellow plastic needle
valve. Later in 2002 Estes produced a killer bee that had none of these features but
looked like the original killer bee except for the needle valve.


I would say mine is the 2002 Estes Killer Bee.

Cheers and keep keeping Cox alive!!

Mr G Cool


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Re: What engine is this???

Post  Admin on Mon May 07, 2012 1:40 am

Well easy now... I'm still sure it isn't a Killer Bee. In your picture, it looks like it has a open exhaust cylinder. The red backplate could have come from several places, either a product engine, as a part from the factory or from a Killer Bee .051. I would say that if it has a black plastic reed retainer, then the backplate is from a Killer Bee .051 (or was purchased from Cox International or Ex Model Engines in the last few years). If it has a "e" clip reed retainer, then it is most likely from a product engine.

Another thing that is keeping me from believing it is a Killer Bee is the crankcase with a hex driveplate for the snap starter.

I'm sure this is a parts built engine.

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Re: What Engine is this???

Post  coxxoc on Mon May 07, 2012 7:07 am

Hi again,

I think you might be right? It has a metal G circlip to keep the copper star reed down.
Anyway, never mind if it`s not a 2000 killer bee as I didn`t pay a great deal for it?

Thanks for you knowledge

Mr G Smile
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Re: What engine is this???

Post  RknRusty on Mon May 07, 2012 10:42 am

Hey it's a Cox, it'll fly, no doubt about it!

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Re: What engine is this???

Post  coxxoc on Mon May 07, 2012 11:06 am

yeah I agree rknRusty, it`s a good old cox!!

Cheers! Beer Cheers Mr G
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