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

Logged in members see NO ADVERTISEMENTS!


.049 cylinder and piston for .051 Cox_ba12




Cox Engines Forum

The official forum for 24/7 Cox Engines and Model Discussion! Ask Questions, Answer Questions, Discuss Cox engines, Cox products, anything CL, FF, RC, 1/2A, and more! Although memberships are encouraged, guests are always welcome!

.049 cylinder and piston for .051 Pixel

Log in

I forgot my password

Search
 
 

Display results as :
 

Rechercher Advanced Search

Latest topics
» Cox 020 PeeWee rebuild questions
by 706jim Today at 9:32 pm

» My current avatar photo
by roddie Today at 8:48 pm

» It's the X Wing that has a canard
by 1975 control line guy Today at 8:05 pm

» Free Flight Radio Assist
by TD ABUSER Today at 2:58 pm

» Pathé Modeling Videos
by Levent Suberk Today at 2:10 pm

» New Model Build
by rdw777 Today at 10:28 am

» My latest doodle...
by layback209 Today at 1:20 am

» Drones, pretty nifty...........
by rsv1cox Yesterday at 6:55 pm

» Project Cox .049 r/c & Citabrian Champion
by roddie Yesterday at 6:20 pm

» My N-1R build log
by roddie Yesterday at 3:27 pm

» Octura engines?
by UncleLumpy Yesterday at 8:16 am

» Tatone EM-7
by sosam117 Yesterday at 7:50 am

Info
Cox Engine of The Month
November-2024
Kim's

"A Space Bug Jr. pulls the Q-Tee up high over Sky Tiger Field"

PAST WINNERS
CEF Traveling Engine
Win This Engine!
Gallery


.049 cylinder and piston for .051 Empty
Live on Patrol


.049 cylinder and piston for .051

Cox Engines Forum  :: General Discussion :: General Questions

Go down

.049 cylinder and piston for .051 Empty .049 cylinder and piston for .051

Post  Darren19 Thu May 09, 2013 5:45 am

Does anyone know if the .049 piston and cylinder will fit in the .051? I've heard they can fit? That is .049 fit the .051 tee dee?
Thanks!
Anonymous
Darren19
Guest


Back to top Go down

.049 cylinder and piston for .051 Empty Re: .049 cylinder and piston for .051

Post  JPvelo Thu May 09, 2013 7:23 am

They swap straight across but you must swap the cylinder AND the piston.

Jim
JPvelo
JPvelo
Diamond Member
Diamond Member

Posts : 1972
Join date : 2011-12-02
Age : 56
Location : Colorado

Back to top Go down

.049 cylinder and piston for .051 Empty Re: .049 cylinder and piston for .051

Post  anm2 Thu May 09, 2013 8:13 am

The .049 and the .051 Tee Dee use the same crankcase. The only difference would be the piston and cylinder configuration. As mentioned above, the .051 piston is not for use in the .049 cylinder.
avatar
anm2
Gold Member
Gold Member

Posts : 293
Join date : 2013-03-30

Back to top Go down

.049 cylinder and piston for .051 Empty Re: .049 cylinder and piston for .051

Post  SuperDave Thu May 09, 2013 8:35 am

Darren:

You've gotten a number of responses as a "guest" why not join our membership and you'll probably get more as well as other benefits?

SD
SuperDave
SuperDave
Rest In Peace
Rest In Peace

Posts : 3552
Join date : 2011-08-13
Location : Washington (state)

Back to top Go down

.049 cylinder and piston for .051 Empty Re: .049 cylinder and piston for .051

Post  Darren19 Thu May 09, 2013 10:34 am

Thanks SD I just joined thanks!
Darren19
Darren19
Moderate Poster
Moderate Poster

Posts : 16
Join date : 2013-05-09

Back to top Go down

.049 cylinder and piston for .051 Empty Re: .049 cylinder and piston for .051

Post  SuperDave Thu May 09, 2013 10:39 am

A piston and cylinder must be dimenionally a matched set and not intermixed.

SD
SuperDave
SuperDave
Rest In Peace
Rest In Peace

Posts : 3552
Join date : 2011-08-13
Location : Washington (state)

Back to top Go down

.049 cylinder and piston for .051 Empty Re: .049 cylinder and piston for .051

Post  RknRusty Thu May 09, 2013 4:24 pm

Welcome, Darren, glad to have you on board.

_________________
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

.049 cylinder and piston for .051 Empty Re: .049 cylinder and piston for .051

Post  Darren19 Thu May 09, 2013 5:58 pm

Thank you.
Darren19
Darren19
Moderate Poster
Moderate Poster

Posts : 16
Join date : 2013-05-09

Back to top Go down

.049 cylinder and piston for .051 Empty Re: .049 cylinder and piston for .051

Post  SuperDave Fri May 10, 2013 10:09 am

Darren:

FYI

The difference between a TD .049 and TD .051 is only .002" thus placing them in two different classifications 1/2A and A for competition purposes according the AMA rules.

SD
SuperDave
SuperDave
Rest In Peace
Rest In Peace

Posts : 3552
Join date : 2011-08-13
Location : Washington (state)

Back to top Go down

.049 cylinder and piston for .051 Empty Re: .049 cylinder and piston for .051

Post  pkrankow Fri May 10, 2013 10:53 am

SuperDave wrote:Darren:

FYI

The difference between a TD .049 and TD .051 is only .002" thus placing them in two different classifications 1/2A and A for competition purposes according the AMA rules.

SD

There are quite a few different engine pairs that do this, from several manufacturers, since it allows the same model to compete in 2 classes with an engine swap. The performance between the adjacent sizes in theory should be identical, in practice it is extremely similar or it wouldn't be a working idea.

Phil
pkrankow
pkrankow
Top Poster
Top Poster

Posts : 3025
Join date : 2012-10-02
Location : Ohio

Back to top Go down

.049 cylinder and piston for .051 Empty Re: .049 cylinder and piston for .051

Post  SuperDave Fri May 10, 2013 11:12 am

And to take it a step farher the TD .051 piston has two horizontal grooves that allows contest judges to make the displacement determination.

SD
SuperDave
SuperDave
Rest In Peace
Rest In Peace

Posts : 3552
Join date : 2011-08-13
Location : Washington (state)

Back to top Go down

.049 cylinder and piston for .051 Empty Re: .049 cylinder and piston for .051

Post  OVERLORD Fri May 10, 2013 12:12 pm

Here's a picture of the grooved piston to illustrate what SuperDave just said.

Lieven

.049 cylinder and piston for .051 10
OVERLORD
OVERLORD
Diamond Member
Diamond Member

Posts : 1807
Join date : 2013-03-19
Age : 58
Location : Normandy, France

Back to top Go down

.049 cylinder and piston for .051 Empty Re: .049 cylinder and piston for .051

Post  pkrankow Fri May 10, 2013 12:17 pm

Here it is again, side by side.
https://i.servimg.com/u/f83/17/84/87/39/img_2013.jpg
.049 cylinder and piston for .051 Img_2013

Phil
pkrankow
pkrankow
Top Poster
Top Poster

Posts : 3025
Join date : 2012-10-02
Location : Ohio

Back to top Go down

.049 cylinder and piston for .051 Empty Re: .049 cylinder and piston for .051

Post  SuperDave Fri May 10, 2013 1:37 pm

Yep, and if you look at an .051 piston out of the cylinder there are TWO indentifying grooves.

SD
SuperDave
SuperDave
Rest In Peace
Rest In Peace

Posts : 3552
Join date : 2011-08-13
Location : Washington (state)

Back to top Go down

.049 cylinder and piston for .051 Empty Re: .049 cylinder and piston for .051

Post  pkrankow Fri May 10, 2013 2:50 pm

SuperDave wrote:Yep, and if you look at an .051 piston out of the cylinder there are TWO indentifying grooves.

SD

Seeing I have never seen a 2 groove cox piston, got a picture?

What is the single groove indicate if it isn't .051?

Phil
pkrankow
pkrankow
Top Poster
Top Poster

Posts : 3025
Join date : 2012-10-02
Location : Ohio

Back to top Go down

.049 cylinder and piston for .051 Empty Re: .049 cylinder and piston for .051

Post  fredvon4 Sat May 11, 2013 9:19 am

My ten .051 pistons all have only one groove...

I have seen photos of two groves but have never touched one
fredvon4
fredvon4
Top Poster
Top Poster

2022 Supporter

Posts : 4012
Join date : 2011-08-26
Age : 69
Location : Lampasas Texas

Back to top Go down

.049 cylinder and piston for .051 Empty Re: .049 cylinder and piston for .051

Post  SuperDave Sat May 11, 2013 9:46 am

Fred:

TD .049's don't have piston grooves and SOME, but not all, TD .051's have one OR two grooves. The only TD .051 that I've disassembled that far had two.

Why? I have not a clue but Cox was known for running production variations. Regardless ANY groove was put there to identify .051's from .049 TD's on these engines.

SD
SuperDave
SuperDave
Rest In Peace
Rest In Peace

Posts : 3552
Join date : 2011-08-13
Location : Washington (state)

Back to top Go down

.049 cylinder and piston for .051 Empty Re: .049 cylinder and piston for .051

Post  crankbndr Sat May 11, 2013 10:01 am

In my collection the only .051s with two rings are Killer Bee .051s, all NIB.
crankbndr
crankbndr
Top Poster
Top Poster

Posts : 3109
Join date : 2011-12-10
Location : Homestead FL

Back to top Go down

.049 cylinder and piston for .051 Empty Re: .049 cylinder and piston for .051

Post  fredvon4 Mon May 13, 2013 7:40 am

Sorry to not be clear in my post. I was just stating the fact that I have a few .051s with only one groove on the piston skirt. I know there are variants out there with two grooves also indicating a .051 piston.

Side note: Because new .051 piston and cylinder sets are hard to acquire, I have had some success with fitting a well worn .051 piston into a new, but sloppy with a .049 piston, TD cylinder using Ken Cook's lapping process...since the lapping reduces the piston and cylinder I assume I have a set that is more than .049 and less than .051...grin
fredvon4
fredvon4
Top Poster
Top Poster

2022 Supporter

Posts : 4012
Join date : 2011-08-26
Age : 69
Location : Lampasas Texas

Back to top Go down

.049 cylinder and piston for .051 Empty Re: .049 cylinder and piston for .051

Post  SuperDave Mon May 13, 2013 9:25 am

Oh what a conundrum this!

YAWN............................... Tired w/ Coffee Read Sad Goodbye

SD
SuperDave
SuperDave
Rest In Peace
Rest In Peace

Posts : 3552
Join date : 2011-08-13
Location : Washington (state)

Back to top Go down

.049 cylinder and piston for .051 Empty Re: .049 cylinder and piston for .051

Post  Sponsored content


Sponsored content


Back to top Go down

Back to top

Cox Engines Forum  :: General Discussion :: General Questions

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