Difference between wr pipe and cr pipe ?

I have 2 pipes for my 79 wr and they look the same from the outside, and they may be the same but I was wondering how you determine what pipe you have. My bike is really quiet and just don't have the ting ting sound that the cr's do. I would like to try a cr pipe and see if I like it more and if and when I ever race in a vintage enduro , I could install the wr pipe and silencer with the baffle cone to be legal.
when you tap on the pipe it has more of a thud sound . So if I have 2 wr pipes one will be for sale and I will be looking for a cr pipe that fits a 250.

Pipe should be designed to deliver the sound wave back to the engine at the optimum rev range for the porting/timing etc would imagine the position of the cone distance from the exhaust port would be closer on the cr for more top end.would be interseting to see how much the exhaust efffects the power range.

The bike has a cr cylinder and has been ported, nothing crazy tho just smoothed up and sharpened .

I think the silencer will make much more difference than the expansion chamber. Most times the expansion chamber is slightly different, but its very minimal, where the WR silencers have always been more restrictive (and heavy) than the CRs.

the silencer definitely wakes up the wr bikes....the cores are real tiny usually

Ok, I have a aftermarket silencer I can try this week end .

I just checked tech ref and parts on this site and the cr pipe is 15 14 222 01 and the wr is 15 14 241 01
So maybe there is some difference between them?
Could there be a difference in the wall thickness?

the thing i have noticed between the cr and wr pipes is usually the diverging cone. the cr has a shorter, fatter one and the wr having a longer thinner one..that was something i remembered on my 79wr. the wr pipe is double wall for sound..

I remember reading that somewhere now that you say it. Well, I will try the silencer first and then I will decide to look for a pipe.

Yes that is correct. The WR pipes had a double wall to help reduce noise, that is one of the reasons they are heavier than the CR pipe.

Marty

The CR and WR pipes, of almost any year, are definitely different, but in my experience the difference in actual performance is minimal. You definitely want to change the silencer first, that will be the biggest chunk of performance gain.