Cox engines - Trying to make sense of non-sense - Picture heavy

rsv1cox Tue Feb 27, 2018 10:37 am

I have stacks of Cox engines, not as many as some here but a respectable amount.

Never being a serious book study student on all things Cox, I have decided to learn about them with a hands-on approach, much more fun. So I have laid out parts, complete engines, partially complete engines, and partzers in the hopes of making as many complete (as original factory) as possible.

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Starting with these two randomly selected examples I discovered that despite being very similar there are differences.

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Both are slit exhaust "product" engines (correct me if I'm wrong on any of this.) Differences are - different colored back-plates, different attaching screws (slotted/phillips), different reeds (milar/metal), different cylinders (one relieved for the Cox wrench at the top of the cylinder, the other not. (How do you remove the cylinder on these?)

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Checking out the Cox airplane site I think the engine with the three blade prop and red spinner is from 1963 to 1970 and is pictured on a P-51 Mustang and probably others. Looks like the other one was used on Cox Sky Jumper and Attack Helicopters.

Next up...........

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SkyStreak Tue Feb 27, 2018 11:10 am

Don't do what I have done by mixing up the different variant parts until you don't know what is what.

Surfer_kris Tue Feb 27, 2018 11:19 am

rsv1cox wrote:
different cylinders (one relieved for the Cox wrench at the top of the cylinder, the other not. (How do you remove the cylinder on these?)

An adjustable leather belt is the easiest option. It also helps to heat up the engine a little bit.

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rsv1cox Tue Feb 27, 2018 12:01 pm

SkyStreak wrote:Don't do what I have done by mixing up the different variant parts until you don't know what is what.

I'm afraid that pony has already left the corral. Sad

Most of those parts came with other engines.

The wiki site is quite good, but there is another that I have misplaced. Handy for ID'ing what goes with what.

https://en.wikipedia.org/wiki/Cox_model_engine

Thanks Kris, about the only option on those slit cylinders.

Bob

roddie Tue Feb 27, 2018 4:37 pm

Hi Bob, Regarding the 1st two examples; were the needles the same thread-size? At some point in time.. Cox stopped putting the fine-thread NVA in its' plastic backplates (carbs). I'm pretty sure that all of the square (postage-stamp) backplates had the fine-thread NVA.. but I think that some of the "horseshoe" backplates also had them.

rsv1cox Tue Feb 27, 2018 4:48 pm

roddie wrote:Hi Bob, Regarding the 1st two examples; were the needles the same thread-size? At some point in time.. Cox stopped putting the fine-thread NVA in its' plastic backplates (carbs). I'm pretty sure that all of the square (postage-stamp) backplates had the fine-thread NVA.. but I think that some of the "horseshoe" backplates also had them.

I have to check on that roddie, and record the results. I can see that the shaft length is different (probably due to application) but I don't know about TPI. Looks like the springs are different too.

Jason_WI Tue Feb 27, 2018 6:23 pm

Looks like a good start to a collection there Bob.

I too use an old leather belt on the slotted cylinders without the top fin milled. Not many are without tool marks on the fins. Not sure what Cox was thinking with no real way to remove a cylinder to be able to reset a piston.

66 Malibu Tue Feb 27, 2018 8:41 pm

Bob,
What you need to get is a copy of Tim Dannels and Dan Sitters " Cox Model Engine Handbook ".
I recently got a copy, as a birthday present for me to justify the price to a cheap me, and I wish I had done it years ago!!!
You can get it on eBay as you all probably already know.
It will be your guiding light to get your Cox jewels to about 99.5% factory correct.
Due to so many variations of Cox products and probably daily changes if and when assembly line parts may have been depleted there were probably many Cox unknown variations that left the plant.
I know from some unmolested things I have, the Handbook is not 100% correct due to, I believe, they did what ever it took to get products out the door.
However, the intel is by far the best we'll ever see...........
Steve.................

rsv1cox Wed Feb 28, 2018 8:33 am

Thanks Steve, done!

I appreciate the little extra push I needed to finally order one. Smile

Bob

getback Wed Feb 28, 2018 6:10 pm

I love the newest Interest Bob , i would like to have one those books but will have to wait ! LOT of variables but it's all in Fun at the end Laughing

I love you're clean up s with the enya's and all but ,with these engines to make them perform you will have to go the extra 1/2 A mile This Site Rocks!

Levent Suberk Thu Mar 01, 2018 7:34 am

66 Malibu wrote:Bob,
What you need to get is a copy of Tim Dannels and Dan Sitters " Cox Model Engine Handbook ".
I recently got a copy, as a birthday present for me to justify the price to a cheap me, and I wish I had done it years ago!!!
You can get it on eBay as you all probably already know.
It will be your guiding light to get your Cox jewels to about 99.5% factory correct.
Due to so many variations of Cox products and probably daily changes if and when assembly line parts may have been depleted there were probably many Cox unknown variations that left the plant.
I know from some unmolested things I have, the Handbook is not 100% correct due to, I believe, they did what ever it took to get products out the door.
However, the intel is by far the best we'll ever see...........
Steve.................

Where I can buy this book other than ebay? Do you know any book store address?

66 Malibu Thu Mar 01, 2018 10:43 am

Levent,
The Cox Model Engine Handbook is published by The Model Museum, The Engine Collectors Journal and Tim Dannels.
Address is :
P.O. Box 243
Buena Vista, CO 81211
(719)395-8421
email- ecj@chaffee.net
You may want to email them to buy the Handbook another way other than eBay.
Hope you get one...The educational value is tremendous.
Steve......................

Levent Suberk wrote:
66 Malibu wrote:Bob,
What you need to get is a copy of Tim Dannels and Dan Sitters " Cox Model Engine Handbook ".
I recently got a copy, as a birthday present for me to justify the price to a cheap me, and I wish I had done it years ago!!!
You can get it on eBay as you all probably already know.
It will be your guiding light to get your Cox jewels to about 99.5% factory correct.
Due to so many variations of Cox products and probably daily changes if and when assembly line parts may have been depleted there were probably many Cox unknown variations that left the plant.
I know from some unmolested things I have, the Handbook is not 100% correct due to, I believe, they did what ever it took to get products out the door.
However, the intel is by far the best we'll ever see...........
Steve.................

Where I can buy this book other than ebay? Do you know any book store address?

Levent Suberk Thu Mar 01, 2018 11:05 am

Thank you

rsv1cox Thu Mar 01, 2018 12:14 pm

getback wrote:I love the newest Interest Bob , i would like to have one those books but will have to wait ! LOT of variables but it's all in Fun at the end I love you're clean up s with the enya's and all but ,with these engines to make them perform you will have to go the extra 1/2 A mile

I'm mixing and matching up a storm Eric. Smile

Bob

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