Case Matching

How much of a gain results from a decent case matching process. I'm assuming you gain a fair amount of performance from the whole ordeal and I understand that it makes the fuel flow like it should to the ports and to the cylinder. But how much of a speed gain would likely result?

And also I have the same question for going from an open but unrestricted pipe to an expansion pipe.

And why does an expansion pipe cause a bottom end/full power band gain?

Re: Case Matching

"Read the stuff here for FREE!":http://edj.net/2stroke/jennings/

Re: Case Matching

Expansion pipes use sound waves to push unburnt fuel back into the combustion chamber. This increases power over a broad rpm range in some pipe designs. Some pipe designs have a massive power gain which kicks in suddenly.

Anyway, using an expansion pipe not only increase power greatly, it also lowers emissions and increases fuel economy.

Re: Case Matching

i've never head of a pipe increasing bottom end power.

Re: Case Matching

sound waves? fuel economy? I'm suddenly twice as excited about getting my pipe now.

Re: Case Matching

You can get a pipe tuned for whatever rpm range you want.

Re: Case Matching

Yes, you should be very excited.

BTW, the best pipes use tapered headers, multi stage diffusers, and multi stage baffles.

A tapered header is one which gradually gets larger.

A diffuser is the first part of an expansion chamber. A single stage will look like a cone. Multi stage means it changes shape, generally more towards a trumpet shape. I have seen up to a 3 stage diffuser on moped pipes.

Then you have the "straight section" in the middle of the expansion chamber. Not all expansion pipes have this, but the better ones do.

Then you have the baffle. Again, a single stage looks like a cone. I have seen up to a 2 stage baffle on expansion exhausts. 2 stage baffles are most effective on smaller engines (ie your engine). A 2 stage baffle will be bulbous shaped.

Then after that you have the stinger, and the silencer, both of which are also important.

Re: Case Matching

i was told by Kevin at Seattle Mopeds that nobody really makes a pipe that is tuned for low end.

Re: Case Matching

50cc.nl go to yamaha then chappy then exhaust. I'm getting the ninja.

<img src="http://www.50cc.eu/plaatjes-onderd/18418.jpg">;

giannelli

<img src="http://www.50cc.eu/plaatjes-onderd/16326.jpg">;

Ninja

Re: Case Matching

Yeah that Ninja is quality.

Re: Case Matching

🇮🇹💦 Of the Loin /

the tecno circuit is the closest i have seen to a low end pipe. Its quite torquey.

Re: Case Matching

) Cupermcnewbster ( /

Is yours a chappy moped or noped? The ninja won't work on the moped.

Did you order from 50cc.nl yet? I want to order my ninja but I'm waiting for a footrest bracket and a new rear wheel. How much was shipping and how long does it take?

Re: Case Matching

what the hell are you talking about? no i haven't ordered it. Why won't that pipe work with my bike?

Re: Case Matching

) Cupermcnewbster ( /

Does your chappy have pedals?

If it does, the ninja will not work.

Re: Case Matching

it has pedals and a kickstart. and currently only has one pedal.

why won't the pipe work?

Re: Case Matching

No ordeal involved, it's free power, more fuel in the combustion chamber instead of sitting someplace.

Re: Case Matching

) Cupermcnewbster ( /

Just look at where the pipe crosses the rear swingarm in this photo:

http://img246.imageshack.us/my.php?image=02pa8.jpg

As you can see, it blocks the pedal axle assembly, so if you have that, and the pedal model kickstart, it is going to come in contact with the pipe. The giannelli is bent to fit with pedals but the ninja is not. The noped chappys have a footrest bracket right under the transmission, and the majority of euro chappy's are not mopeds, so the ninja fits all of them.

I ordered an lb80 swingarm, rear axle, wheel and kickstart so putting all this stuff on will be much easier. I am still waiting for my footpeg bracket, but it should be here soon.

Re: Case Matching

) Cupermcnewbster ( /

Photo:

1188799221_chap.jpg

Re: Case Matching

Zack I don't know if you noticed. But we do ghetto things and make shit fit. My pedals are just for show and I'll affix them to the bottom of the engine if I have to. You scared me for a second dude. I thought that you meant the exhaust wouldn't fit onto my shock bracket or that the threads wouldn't fit the exhaust port. I don't have a right pedal anyway.

Re: Case Matching

If I did want to keep my pedals. Is the giannelli quality?

Re: Case Matching

) Cupermcnewbster ( /

I'm not sure on giannelli's quality.

I was just trying to save you an "oh shit" moment because the ninja's are expensive, and I'm not sure on the compatability of the bended kickstart. I could easily see it breaking if you tried to bend it. I've talked to a few french guys and I was trying to save a hassle.

Re: Case Matching

gianelli makes good stuff. see if you can find some french forums and read up on this stuff and figure out which pipe works best with the polini kit.

Re: Case Matching

well thanks dude i guess i'll just get the giannelli. i'm sure it'll be easier to locate a US dealer of giannelli anyway

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