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Cox Engine of The Month
July-2024
robot797's
![](https://i.servimg.com/u/f95/15/46/86/41/3_robo10.jpg)
"ULTIMITE COX 010: it has a clutch, E starter, throttle, exhaust, aluminum tank, aluminum venturi, gearbox with forward and reverse, and now its on a custom drawn and printed stand"
![](https://i.servimg.com/u/f95/15/46/86/41/sponso12.png)
PAST WINNERS
robot797's
![](https://i.servimg.com/u/f95/15/46/86/41/3_robo10.jpg)
"ULTIMITE COX 010: it has a clutch, E starter, throttle, exhaust, aluminum tank, aluminum venturi, gearbox with forward and reverse, and now its on a custom drawn and printed stand"
![](https://i.servimg.com/u/f95/15/46/86/41/sponso12.png)
PAST WINNERS
Cox Diesel engine with no teflon disk or o rings!
Page 1 of 1
colibriguitars- Bronze Member
- Posts : 54
Join date : 2012-05-06
Age : 46
Location : Mexico City
colibriguitars- Bronze Member
- Posts : 54
Join date : 2012-05-06
Age : 46
Location : Mexico City
Re: Cox Diesel engine with no teflon disk or o rings!
Nice job. Looks really well made. Have you used a heavier duty crankshaft? I'd be worried about over-stressing the crank pin and ball-joint.
Not sure what Valentine engines use, but I'd never seen discs or o-rings used in diesel engines prior to getting involved in the Cox scene. I grew up with diesels as a kid and they all only ever used a contra-piston close fit in a sleeve.
Hope you have good success with it.
Rod.
Not sure what Valentine engines use, but I'd never seen discs or o-rings used in diesel engines prior to getting involved in the Cox scene. I grew up with diesels as a kid and they all only ever used a contra-piston close fit in a sleeve.
Hope you have good success with it.
Rod.
Oldenginerod- Top Poster
- Posts : 3985
Join date : 2012-06-15
Age : 61
Location : Drouin, Victoria
Re: Cox Diesel engine with no teflon disk or o rings!
O rings have been in use for 65 years ( O.K. and McCoy ) on contra pistons . I really like that slave cylinder set up . New to me and I've made a few diesel heads in my time . And yes a Diesel crank or heavy duty crank is a good idea if you plan a long life for your engine .
Mike 1484
Mike 1484
Mike1484- Gold Member
- Posts : 300
Join date : 2011-10-28
Age : 75
Location : Northern Ohio
Re: Cox Diesel engine with no teflon disk or o rings!
Mike1484 wrote:O rings have been in use for 65 years ( O.K. and McCoy ) on contra pistons . I really like that slave cylinder set up . New to me and I've made a few diesel heads in my time . And yes a Diesel crank or heavy duty crank is a good idea if you plan a long life for your engine .
Mike 1484
It only seems to be U.S. engines that use an o-ring. Not sure why that is or what the perceived advantage might be. The only thing I can think is that it may cut production cost by not having the extremely fine tolerances of the contra-piston fit used in European diesels. The o-ring also gives the engine another potential point of failure.
Oldenginerod- Top Poster
- Posts : 3985
Join date : 2012-06-15
Age : 61
Location : Drouin, Victoria
Re: Cox Diesel engine with no teflon disk or o rings!
Yes, we never understood the teflon and o-ring stuff on this side of the pond... ![Shh](/users/3015/29/34/60/smiles/2044066509.gif)
One can also make a proper counter piston inside the head, without having to modify any cylinders. This was sold as an after market product here in the early 80-ties, the smaller counter piston diameter gave an easier tuning:
![Cox Diesel engine with no teflon disk or o rings! Zoom10](https://i.servimg.com/u/f39/17/14/65/91/zoom10.jpg)
![Shh](/users/3015/29/34/60/smiles/2044066509.gif)
One can also make a proper counter piston inside the head, without having to modify any cylinders. This was sold as an after market product here in the early 80-ties, the smaller counter piston diameter gave an easier tuning:
![Cox Diesel engine with no teflon disk or o rings! Zoom10](https://i.servimg.com/u/f39/17/14/65/91/zoom10.jpg)
Surfer_kris- Diamond Member
- Posts : 1909
Join date : 2010-11-20
Location : Sweden
![-](https://2img.net/i/empty.gif)
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