Cox Engines Forum
You are not logged in! Please login or register.

Logged in members see NO ADVERTISEMENTS!


Cox Diesel engine with no teflon disk or o rings! Cox_ba12




Cox Diesel engine with no teflon disk or o rings! Pixel

Log in

I forgot my password

Search
 
 

Display results as :
 


Rechercher Advanced Search

Latest topics
» [solved]most Efficent Glowhead Clip for Norvel Engine
by Levent Suberk Today at 9:37 pm

» Enya .09 II Questions
by GallopingGhostler Today at 8:35 pm

» 22mm 2-blade nylon marine prop and solid-shaft drive
by roddie Today at 5:14 pm

» Jim Walker Firebaby
by rdw777 Today at 5:00 pm

» Cox .35 and .40 in Nürnberg Toy Fair
by crankbndr Today at 4:55 pm

» Cox Corvette - front end plastic part
by AMCGUY Today at 3:57 pm

» A prototype Cox Reed-valve marine engine
by 1/2A Nut Today at 3:39 pm

» How's the weather?
by HalfaDave Today at 12:02 pm

» Wen Mac .049 - Conditioning.
by MauricioB Today at 11:39 am

» music vids.. some of your favorites
by HalfaDave Today at 11:23 am

» Draco Goes Flying, But Misses the Eclipse
by HalfaDave Yesterday at 9:59 pm

» Happy 53rd birthday Mauricio!!!
by MauricioB Yesterday at 11:47 am

Cox Engine of The Month
April-2024
OVERLORD's

"Kress ducted fan with new Cox Conquest 15 RC"



PAST WINNERS
CEF Traveling Engine

Win This Engine!
Gallery


Cox Diesel engine with no teflon disk or o rings! Empty
Live on Patrol


Cox Diesel engine with no teflon disk or o rings!

Go down

Cox Diesel engine with no teflon disk or o rings! Empty Cox Diesel engine with no teflon disk or o rings!

Post  colibriguitars Sun Sep 15, 2019 9:19 pm

hi guys!
here my first Cox engine dieselized with no teflon or o rings.
made a cast iron slave and contra piston... here the pics!
waiting for a test run, but it has burst with a prime with engine in my hand.... Cox Diesel engine with no teflon disk or o rings! Img_4310
Cox Diesel engine with no teflon disk or o rings! Img_4312
Cox Diesel engine with no teflon disk or o rings! Img_4311
colibriguitars
colibriguitars
Bronze Member
Bronze Member

Posts : 54
Join date : 2012-05-06
Age : 46
Location : Mexico City

Back to top Go down

Cox Diesel engine with no teflon disk or o rings! Empty Re: Cox Diesel engine with no teflon disk or o rings!

Post  colibriguitars Sun Sep 15, 2019 9:21 pm

more pics....Cox Diesel engine with no teflon disk or o rings! Img_4314
Cox Diesel engine with no teflon disk or o rings! Img_4313
Cox Diesel engine with no teflon disk or o rings! Img_4315
Cox Diesel engine with no teflon disk or o rings! Img_4314
Cox Diesel engine with no teflon disk or o rings! Img_4313
Cox Diesel engine with no teflon disk or o rings! Img_4315
colibriguitars
colibriguitars
Bronze Member
Bronze Member

Posts : 54
Join date : 2012-05-06
Age : 46
Location : Mexico City

Back to top Go down

Cox Diesel engine with no teflon disk or o rings! Empty Re: Cox Diesel engine with no teflon disk or o rings!

Post  Oldenginerod Sun Sep 15, 2019 9:37 pm

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.
Oldenginerod
Oldenginerod
Top Poster
Top Poster

Posts : 3969
Join date : 2012-06-15
Age : 61
Location : Drouin, Victoria

Back to top Go down

Cox Diesel engine with no teflon disk or o rings! Empty Re: Cox Diesel engine with no teflon disk or o rings!

Post  Mike1484 Mon Sep 16, 2019 9:43 pm

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
Mike1484
Mike1484
Gold Member
Gold Member

Posts : 296
Join date : 2011-10-28
Age : 75
Location : Northern Ohio

Back to top Go down

Cox Diesel engine with no teflon disk or o rings! Empty Re: Cox Diesel engine with no teflon disk or o rings!

Post  Oldenginerod Mon Sep 16, 2019 10:02 pm

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
Oldenginerod
Top Poster
Top Poster

Posts : 3969
Join date : 2012-06-15
Age : 61
Location : Drouin, Victoria

Back to top Go down

Cox Diesel engine with no teflon disk or o rings! Empty Re: Cox Diesel engine with no teflon disk or o rings!

Post  Surfer_kris Tue Sep 17, 2019 5:22 am

Yes, we never understood the teflon and o-ring stuff on this side of the pond...  Shh

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
Surfer_kris
Surfer_kris
Diamond Member
Diamond Member

Posts : 1902
Join date : 2010-11-20
Location : Sweden

Back to top Go down

Cox Diesel engine with no teflon disk or o rings! Empty Re: Cox Diesel engine with no teflon disk or o rings!

Post  Sponsored content


Sponsored content


Back to top Go down

Back to top

- Similar topics

 
Permissions in this forum:
You cannot reply to topics in this forum