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Did anyone make a Cox TD 15 diesel conversion head?

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Did anyone make a Cox TD 15 diesel conversion head?

Old 12-07-2010, 04:48 AM
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Dan Vincent
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Default Did anyone make a Cox TD 15 diesel conversion head?

I'm asking because there were several .09 size engines that have the same thread as a Cox .15.

Fox .09 Rocket
Fox .10
Hustler .10
Gilbert .11

Just curious as that Fox Rocket would look great as a diesel.
Old 12-07-2010, 07:59 AM
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gkamysz
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Default RE: Did anyone make a Cox TD 15 diesel conversion head?

Would any of these handle the stress of diesel?
Old 12-07-2010, 04:41 PM
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JohnAV8R
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Default RE: Did anyone make a Cox TD 15 diesel conversion head?

There was a TD .15 Cox on EBay that had a diesel head.
Perhaps post your question on
http://www.rcgroups.com/forums/showthread.php?t=1054975

John
Old 12-08-2010, 02:31 AM
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qazimoto
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Default RE: Did anyone make a Cox TD 15 diesel conversion head?


Dan,

if your only purpose is to make the engine "look good" then a diesel head will be just fine.

Otherwise if someone wants to use it then forget it. Lightweight sports glow engines make lously diesels.

Lockie.
Old 12-08-2010, 06:24 AM
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Default RE: Did anyone make a Cox TD 15 diesel conversion head?


ORIGINAL: gkamysz
Would any of these handle the stress of diesel?
Probably not. The Gilbert .11 is not a strong, well built engine. I do not have the .09's listed.

The first generation Tee Dees would sometimes loose their heads even running glow. Perhaps the Mk-2 and later would hang together as a diesel.

My TeeDee .15 is an early one and I only run it on an 8" prop, nothing stressful, not often.

George
Old 12-08-2010, 08:17 AM
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Jim Thomerson
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Default RE: Did anyone make a Cox TD 15 diesel conversion head?

The actual TD 15 was in production for only a short time. The cylinder was weak and would break at the exhaust ports. It was replaced by the Special which had a thicker cylinder and a piston pin. I blew a rod on a Special with a Cox 8 x 4 and 10% nitro fuel.
Old 12-08-2010, 08:53 AM
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Default RE: Did anyone make a Cox TD 15 diesel conversion head?


ORIGINAL: locktite401
Lightweight sports glow engines make lously diesels.
What do you base that on?
I have a Peewee that runs better as diesel than any peewee I've run on glow. It can take a larger prop and I get more consistent runs and use everything in the tank.

You could also take a look at the numerous youtube movies from AndyW on different Norvels etc.
Old 12-08-2010, 09:17 AM
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Default RE: Did anyone make a Cox TD 15 diesel conversion head?

I do not think that anyone tried to dieselize a Fox 09 or 10 yet. You could be the first.
The engines are a sound design, they would hold up OK.
As mentioned already the TeeDee 15 could have problems, because of the thinner cylinder.

i don't think Davis Diesel made a TeeDee head, but the regular Medallion 15 head ought to work just fine, same threading size as far as I remember it.

Old 12-18-2010, 02:03 AM
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Default RE: Did anyone make a Cox TD 15 diesel conversion head?

ORIGINAL: gkamysz

Would any of these handle the stress of diesel?


Having owned and flown the Fox .09 glow engine, if its mechanical strength is proportional to its power output, and there is no reason to assume that it is, I would be doubtful that it is robust enough to endure running as a Diesel. Not to mention that the piston baffle could be problematic - if it has one. Danged if I can remember.


Ed Cregger
Old 12-18-2010, 02:30 AM
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Dan Vincent
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Default RE: Did anyone make a Cox TD 15 diesel conversion head?

There is no baffle on the Fox .09 piston. It has radial ports like 1/2A engines.

I saw a Fox .09 or Gilbert .11 that had been converted to diesel and had a picture of it but it must be in my old computer as I can't find it in my present one.

Fox designed the Gilbert engines so they should be similar to the Fox .09.

By the way, there were at least two diesel conversion heads made for the Cox Medallion .09 and Cox Tee-Dee .09 by MECOA and Davis. I also have two different diesel conversion heads for the old Arden .09.
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Old 12-18-2010, 05:32 AM
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Default RE: Did anyone make a Cox TD 15 diesel conversion head?


ORIGINAL: Dan Vincent

There is no baffle on the Fox .09 piston. It has radial ports like 1/2A engines.

I saw a Fox .09 or Gilbert .11 that had been converted to diesel and had a picture of it but it must be in my old computer as I can't find it in my present one.

Fox designed the Gilbert engines so they should be similar to the Fox .09.

By the way, there were at least two diesel conversion heads made for the Cox Medallion .09 and Cox Tee-Dee .09 by MECOA and Davis. I also have two different diesel conversion heads for the old Arden .09.
Dan,
If I remember right Bob Davis did make the Cox09 conversion for just a short while. The 09 was not strong enough to hold together as a diesel. The only head that is rarer then the 09 diesel head is the 010 head of which he made about 14.
Dennis
Old 12-18-2010, 06:54 AM
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Default RE: Did anyone make a Cox TD 15 diesel conversion head?


ORIGINAL: Dan Vincent

There is no baffle on the Fox .09 piston. It has radial ports like 1/2A engines.

I saw a Fox .09 or Gilbert .11 that had been converted to diesel and had a picture of it but it must be in my old computer as I can't find it in my present one.

Fox designed the Gilbert engines so they should be similar to the Fox .09.

By the way, there were at least two diesel conversion heads made for the Cox Medallion .09 and Cox Tee-Dee .09 by MECOA and Davis. I also have two different diesel conversion heads for the old Arden .09.


I knew as soon as I hit the send button that the Fox .09 used radial ports (no piston baffle). Then I just as rapidly forgot to edit my post.

The Fox .09 was a gift from the same friend that gave me the McCoy .09 Diesel (my first Diesel). Lots of fun in those days.


Ed Cregger
Old 12-18-2010, 09:03 AM
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Default RE: Did anyone make a Cox TD 15 diesel conversion head?


ORIGINAL: dennis
...If I remember right Bob Davis did make the Cox09 conversion for just a short while. The 09 was not strong enough to hold together as a diesel.
I think Bob Davis posted on here one time that he stopped making the .09 head because the engine ran too hot as a diesel.

George
Old 12-18-2010, 10:04 AM
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Dan Vincent
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Default RE: Did anyone make a Cox TD 15 diesel conversion head?

I heard the Cox .09 ran hot too.

I loved the McCoy Diesel too. What a fun engine.

The McCoy .049 diesel would break the crank if you overcompressed but the .09 was up to the task. Great engine.

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