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

Logged in members see NO ADVERTISEMENTS!


Crankcase upgrade/repair Cox_ba12




Crankcase upgrade/repair Pixel

Log in

I forgot my password

Search
 
 

Display results as :
 


Rechercher Advanced Search

Latest topics
» my attempt at making an exhaust throttle for Cox .049
by roddie Today at 1:39 pm

» Introducing the new - "QZ" RR-1
by roddie Today at 1:08 pm

» STUKA bomb dimentions needed
by latole Today at 9:36 am

» Indexing COX cylinders
by davidll1984 Today at 7:56 am

» Another of C.T. engines cleaned ---- Cox Tee Dee .09 --- Just today (3/26/2024) more Cox parts
by Yabby Today at 7:47 am

» Introducing our Cox .049 TD Engines
by Yabby Today at 6:33 am

» 1/2a Skyray plans?
by 944_Jim Yesterday at 10:14 pm

» Postage stamp backplates
by JPvelo Yesterday at 8:52 pm

» Cosmic Winds, - Big Guy, Little Guys, Silver Guy and Wounded Guy.
by rsv1cox Yesterday at 5:18 pm

» My friend Ramón, his Cox .09 & Cox .010
by MauricioB Yesterday at 12:31 pm

» Parts Cox TD-4
by rsv1cox Yesterday at 8:40 am

» On ebay a very special Cox engine
by davidll1984 Yesterday at 6:32 am

Cox Engine of The Month
March-2024
balogh's

"COX Budapest" .049 engine



PAST WINNERS
CEF Traveling Engine

Win This Engine!
Gallery


Crankcase upgrade/repair Empty
Live on Patrol


Crankcase upgrade/repair

Go down

Crankcase upgrade/repair Empty Crankcase upgrade/repair

Post  ian1954 Fri Jun 14, 2013 2:46 pm

There I was starting to prepare for the Cox flight contest and deciding which engine I could use. Difficult decision in my case - too many options.

Anyway, it had to be beam mounted for the aeroplane I have chosen (this has arrived but I am still waiting for balsa cement and dope - no longer can I walk to the local model shop! - everything has to be mail order.

It also has to be quiet and so needs a good silencer (muffler) and a bit of throttle control. Matt had supplied me with a Hiscott muffley thingy and so I selected one of my restored Medallions to go with it.

Crankcase upgrade/repair Hiscot10


It looks the boy but was not to be a runner at the first attempt!

I was prepared for a lot of messing about with heads as the Hiscott system raises the cylinder and reduces the compression. Messing about turned into two and a half hours of flick - flick - flicking!

It started a couple of times, ran for a couple of minutes and then stopped abruptly. It would not restart while hot.

I thought it was compression and I had not chosen the right head, number of gaskets and so on.................

However. when it ran - the silencer was superb and the throttle control was excellent - along with idling.

After a while I notice fuel spewing from between the prop driver and the crankcase. Further examination showed that the crankshaft was a sloppy fit to say the least!

So ...... not being one to scrap anything - it was time to strip the thing a let it visit the workshop. Where it was.........

drilled and reamed

Crankcase upgrade/repair Bearin10

a suitable piece of brass selected

Crankcase upgrade/repair Bearin11

I made a mistake and turned it too small and so worked further on it for a Bee crankcase

Crankcase upgrade/repair Bearin12Crankcase upgrade/repair Bearin13
Crankcase upgrade/repair Bearin14

anyway - back to the Medallion

Crankcase upgrade/repair Bearin15

Crankcase upgrade/repair Bearin16

off to the mill!
Crankcase upgrade/repair Bearin17

Crankcase upgrade/repair Bearin18


Crankcase upgrade/repair Bearin19


Reassembly ready for testing. Too late to test tonight but fingers crossed for tomorrow. What am I saying? Better not cross my fingers while flicking the thing!

Crankcase upgrade/repair Bearin20
ian1954
ian1954
Diamond Member
Diamond Member

Posts : 2688
Join date : 2011-11-16
Age : 69
Location : England

Back to top Go down

Crankcase upgrade/repair Empty Re: Crankcase upgrade/repair

Post  Cribbs74 Fri Jun 14, 2013 3:45 pm

Impressive....... I would love to bush some of mine.

Ron
Cribbs74
Cribbs74
Moderator

2022 Supporter

2023 Supporter

2024 Supporter

Posts : 11892
Join date : 2011-10-24
Age : 50
Location : Tuttle, OK

Back to top Go down

Crankcase upgrade/repair Empty Re: Crankcase upgrade/repair

Post  RknRusty Fri Jun 14, 2013 7:11 pm

Me too, nice work, Ian. Do you cut an oil groove in the bushing? I don't remember if the TeeDallion crankcase has one. Is brass as good as bronze?

_________________
Don't Panic!
...and never Ever think about how good you are at something...
while you're doing it!


My Hot Rock & Blues Playlist
RknRusty
RknRusty
Rest In Peace
Rest In Peace

Posts : 10869
Join date : 2011-08-10
Age : 68
Location : South Carolina, USA

Back to top Go down

Crankcase upgrade/repair Empty Re: Crankcase upgrade/repair

Post  Jason_WI Fri Jun 14, 2013 7:24 pm

Nice work! Did you add an oil groove to the bushing or is it not needed? What material did you use. I need to get a collet system for my lathe Sad
Jason_WI
Jason_WI
Top Poster
Top Poster

2022 Supporter

Posts : 3123
Join date : 2011-10-09
Age : 48
Location : Neenah, WI

Back to top Go down

Crankcase upgrade/repair Empty Re: Crankcase upgrade/repair

Post  ian1954 Sat Jun 15, 2013 9:51 am

Bronze - phosphor bronze - is better than brass by far. It is easy to machine but very difficult to drill. The material "grabs" drills and it is difficult to get a straight and clean bore. Drills will wander off line. It also heats up quite quickly when drilling. It has to be done slowly with modified drill bits.

The Medallions and Tee Dees don't need a groove but the Bee might. I will run it without and see what happens!
ian1954
ian1954
Diamond Member
Diamond Member

Posts : 2688
Join date : 2011-11-16
Age : 69
Location : England

Back to top Go down

Crankcase upgrade/repair Empty Re: Crankcase upgrade/repair

Post  ian1954 Sat Jun 15, 2013 9:53 am

I got it running but it needs a bit more patience setting the head and gasketing.




A bit boring but the engine is quiet!
ian1954
ian1954
Diamond Member
Diamond Member

Posts : 2688
Join date : 2011-11-16
Age : 69
Location : England

Back to top Go down

Crankcase upgrade/repair Empty Re: Crankcase upgrade/repair

Post  reptile Sat Jun 15, 2013 3:57 pm

Nice muffler may work good on a cox car...do you have the site that sells them?

THANKS
reptile
reptile
Gold Member
Gold Member

Posts : 149
Join date : 2013-05-22

Back to top Go down

Crankcase upgrade/repair Empty Re: Crankcase upgrade/repair

Post  ian1954 Sat Jun 15, 2013 4:34 pm

I am afraid they are no longer easily obtainable.
ian1954
ian1954
Diamond Member
Diamond Member

Posts : 2688
Join date : 2011-11-16
Age : 69
Location : England

Back to top Go down

Crankcase upgrade/repair Empty Re: Crankcase upgrade/repair

Post  MeerschaumSteve Thu Jun 27, 2013 6:11 am

I was thinking the same thing, looks like a great car muffler!
MeerschaumSteve
MeerschaumSteve
Gold Member
Gold Member

Posts : 121
Join date : 2012-10-21
Location : Oklahoma

Back to top Go down

Crankcase upgrade/repair Empty Re: Crankcase upgrade/repair

Post  ian1954 Sat Jun 29, 2013 3:05 pm

I finally got around to building up the Bee. Thought it strange watching the fuel dancing in the filler tube!

ian1954
ian1954
Diamond Member
Diamond Member

Posts : 2688
Join date : 2011-11-16
Age : 69
Location : England

Back to top Go down

Crankcase upgrade/repair Empty Re: Crankcase upgrade/repair

Post  RknRusty Sat Jun 29, 2013 9:01 pm

Nice and steady, that's as smooth as they get. Sounds ready yo fly.

_________________
Don't Panic!
...and never Ever think about how good you are at something...
while you're doing it!


My Hot Rock & Blues Playlist
RknRusty
RknRusty
Rest In Peace
Rest In Peace

Posts : 10869
Join date : 2011-08-10
Age : 68
Location : South Carolina, USA

Back to top Go down

Crankcase upgrade/repair Empty Re: Crankcase upgrade/repair

Post  sdjjadk Sun Jun 30, 2013 6:38 pm

Excellent work Ian! And thanks for the videos as well.

Shawn
sdjjadk
sdjjadk
Platinum Member
Platinum Member

Posts : 640
Join date : 2012-04-07
Location : Southern Maryland

Back to top Go down

Crankcase upgrade/repair Empty Re: Crankcase upgrade/repair

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