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Cox Engine of The Month
.049 cylinder and piston for .051
Page 1 of 1
.049 cylinder and piston for .051
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!
Thanks!
Darren19- Guest
Re: .049 cylinder and piston for .051
They swap straight across but you must swap the cylinder AND the piston.
Jim
Jim
JPvelo- Diamond Member
- Posts : 1972
Join date : 2011-12-02
Age : 57
Location : Colorado
Re: .049 cylinder and piston for .051
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.
anm2- Gold Member
- Posts : 293
Join date : 2013-03-30
Re: .049 cylinder and piston for .051
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
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- Rest In Peace
- Posts : 3552
Join date : 2011-08-13
Location : Washington (state)
Re: .049 cylinder and piston for .051
Thanks SD I just joined thanks!
Darren19- Moderate Poster
- Posts : 16
Join date : 2013-05-09
Re: .049 cylinder and piston for .051
A piston and cylinder must be dimenionally a matched set and not intermixed.
SD
SD
SuperDave- Rest In Peace
- Posts : 3552
Join date : 2011-08-13
Location : Washington (state)
Re: .049 cylinder and piston for .051
Welcome, Darren, glad to have you on board.
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while you're doing it!
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RknRusty- Rest In Peace
- Posts : 10869
Join date : 2011-08-10
Age : 68
Location : South Carolina, USA
Re: .049 cylinder and piston for .051
Thank you.
Darren19- Moderate Poster
- Posts : 16
Join date : 2013-05-09
Re: .049 cylinder and piston for .051
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
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- Rest In Peace
- Posts : 3552
Join date : 2011-08-13
Location : Washington (state)
Re: .049 cylinder and piston for .051
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- Top Poster
- Posts : 3025
Join date : 2012-10-02
Location : Ohio
Re: .049 cylinder and piston for .051
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
SD
SuperDave- Rest In Peace
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Join date : 2011-08-13
Location : Washington (state)
Re: .049 cylinder and piston for .051
Here's a picture of the grooved piston to illustrate what SuperDave just said.
Lieven
Lieven
OVERLORD- Diamond Member
- Posts : 1807
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Age : 58
Location : Normandy, France
Re: .049 cylinder and piston for .051
Here it is again, side by side.
https://i.servimg.com/u/f83/17/84/87/39/img_2013.jpg
Phil
https://i.servimg.com/u/f83/17/84/87/39/img_2013.jpg
Phil
pkrankow- Top Poster
- Posts : 3025
Join date : 2012-10-02
Location : Ohio
Re: .049 cylinder and piston for .051
Yep, and if you look at an .051 piston out of the cylinder there are TWO indentifying grooves.
SD
SD
SuperDave- Rest In Peace
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Join date : 2011-08-13
Location : Washington (state)
Re: .049 cylinder and piston for .051
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- Top Poster
- Posts : 3025
Join date : 2012-10-02
Location : Ohio
Re: .049 cylinder and piston for .051
My ten .051 pistons all have only one groove...
I have seen photos of two groves but have never touched one
I have seen photos of two groves but have never touched one
fredvon4- Top Poster
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Posts : 4012
Join date : 2011-08-26
Age : 69
Location : Lampasas Texas
Re: .049 cylinder and piston for .051
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
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- Rest In Peace
- Posts : 3552
Join date : 2011-08-13
Location : Washington (state)
Re: .049 cylinder and piston for .051
In my collection the only .051s with two rings are Killer Bee .051s, all NIB.
crankbndr- Top Poster
- Posts : 3109
Join date : 2011-12-10
Location : Homestead FL
Re: .049 cylinder and piston for .051
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
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- Top Poster
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Posts : 4012
Join date : 2011-08-26
Age : 69
Location : Lampasas Texas
Re: .049 cylinder and piston for .051
Oh what a conundrum this!
YAWN...............................
SD
YAWN...............................
SD
SuperDave- Rest In Peace
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Join date : 2011-08-13
Location : Washington (state)
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