Bill's Tecate pipe

[DixiePlowboy]

I finally decided to trade a buddy my chrome DG pipe for his Bill's pipe. I had been concerned that the Bill's, being a smaller diameter almost throughout, that I would be sacrificing some power.....somewhere.

After riding my '85 with both, I can say that the Bill's definitely hits harder in the midrange, though a little weaker maybe on bottom end, and seems to pull a good bit harder on top than the DG does.....and the DG was stronger in the same two areas of the powerband than stock.

The pic shows a freshly stripped pipe that will only look that bad for a little while.....just like the dirty Tecate it's stuck on

[Dirtcrasher]

^NICE!

I still look at pipes and think "hmm, I could build that!" but then I wonder HOW they actually figure out what diameter to run and where to run it?? When to taper it etc etc etc.

I can only assume they make em up like crazy and just start changing them around. With a dyno and hands on testing they must figure out what works??

Or do they check the flow such as with a flow bench and how porting is done correctly?

IDK, I think have enough crap to deal with

[DeePa]

do you have the silencer for it?

[DixiePlowboy]

No, I wish I did. I've only got an Answer S-II that came off a liquid R that I've cut and modified to(sort of)fit. I'm definitely going to have to do some more work to get the silencer straight and fitting tight. Otherwise I'd just use a DG universal steel silencer or something.

A DG silencer for an old CR480 looks like it would be a close fit though, and they're still available.

[JohnR.]

do they check the flow such as with a flow bench and how porting is done correctly?

Nope. You aren't dealing with flow, you're dealing with pulses. Building 2 stroke pipes is 50% science and 50% art form. I watched DynoPort build one for my CR500 powered 86 250R back in the early 90's. I hauled the trike up to their shop early one morning and by the end of the day it rolled out with a custom hand made pipe and silencer that night. It was cool to watch them take a piece of sheet metal and make a pipe out of it. He used a calculator a few times when building it but most of it is just being an experience builder and knowing what works.

John

[DeePa]

No, I wish I did. I've only got an Answer S-II that came off a liquid R that I've cut and modified to(sort of)fit. I'm definitely going to have to do some more work to get the silencer straight and fitting tight. Otherwise I'd just use a DG universal steel silencer or something.

i want to say there was around 3ish complete bills systems ever made for that tecate

[200x Basket]

that is a nice looking pipe!!

[brrcuda]

i want to say there was around 3ish complete bills systems ever made for that tecate

I think you mean the 86-87s...... Maybe not made but still around with muff....

[the tecate kid]

WOW did you ever come out with the longer straw. Geez. Nice pipe.