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Post by greezygiger on Jun 7, 2010 0:00:21 GMT -5
a majority of them 11/2 in on the header, and many of them appear stock 1 in pipe for the first turn then get bigger. Will you get the same performance out either one? Is the greater pipe always best. i am working with a stock head that has been ported a little
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Post by 90GTVert on Jun 7, 2010 5:29:20 GMT -5
1" or 1.5" I.D. should work just fine. The aftermarket pipes I've seen tend to be thinner metal than the stock pipe, so even a 1" O.D. aftermarket pipe may be larger inside than the stock pipe if it's 1" O.D.. Most exhaust ports aren't gonna be much bigger than maybe 19mm (.75") when ported unless you have really knocked out a lot of material or you have a ported big valve head. They don't need to be matched to the port. According to A. Graham Bell's 4 Stroke Performance Tuning, a step in the port/header size will reduce exhaust gas backflow.
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Post by greezygiger on Jun 7, 2010 16:06:34 GMT -5
thanks for sharing your knowledge
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Post by Fox on Jun 7, 2010 17:42:05 GMT -5
My experience is that a lot of manufacturers use the word "performance" as a euphemism for "faster" when the product in question is only made to last longer than the factory part it replaces.
In other words, "Performance" can be defined in more than one way so buyer beware!
Semantics...
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Post by greezygiger on Jun 7, 2010 18:21:11 GMT -5
well im not planning on buying i plan on making. and was wondering if i could use the stock header untill the 90 degree bend and increasing the pipe diameter before my muffler. just lots of experimenting trying to get all i can out of those little 50cc. I have currently free flow intake, A9 cam, lots of polishing on the intake manifold, a little port and polishing on the head, as well as match porting the intake and exhaust. Performance coil and NGK, no limit cdi(which i plan on swapping for a more aggressive one). i have a bigger carb im waiting to install as well
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Post by Thebatman on Dec 31, 2010 19:09:12 GMT -5
Hey guys, i couldnt find one for my ? so instead of starting anopther thread i thought i would post in this thread..... i saw the vid wt did on his new 2 bros pipe, which was sweet btw..
anyway, i have a kymco agility 50 4t... do aftermarket pipes help a 50cc 4t?..(wt has a 150)... of course you dont use a expansion chamber.. i found a,seems to be good, price on a lv pipe for the ag but didnt know if any help on a 50cc 4t or just a waste of money...(cant get it today,maybe 1 mth)... i need to change the rollers now, she stinks on hills ;D... thanks for any input on this..... :thumb:
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Post by 90GTVert on Dec 31, 2010 21:20:50 GMT -5
The average aftermarket pipe helps a little. Nothing like a 2T. The LV pipes look like good quality. BBK would be the best bang for the buck and help you WAY more with those hills.
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Post by Thebatman on Jan 1, 2011 11:17:14 GMT -5
Thanks for the reply 90... yeah, i had found the lv pipe, comes with rollers and springs for 149.....of course i cant do much on her now since now this is my only transportion.. do want to jet,filter for sure tho...i wish i could but a bbk for every scoot but i dont have those funds right now....ever.. :no: ..need a job that will actually pay something...single man with a 4yr old daughter averaging about 6.00 hr dont go far.....another reason why I was gonna build the zx cuz i couldnt pay someone elsen to do it...and now look at me.... :banghead: :no:
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Post by 90GTVert on Jan 1, 2011 14:08:28 GMT -5
You can get a BBK for less than that pipe and rollers when it comes time.
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Post by Thebatman on Jan 1, 2011 17:48:58 GMT -5
Where?..... maybe a kit that'll take $0000 to fix to even work as some of us saw with a build by josh elswhere.... a malossi kit will cost at least 2 bills.... a polini or malossi if bbking.... beeen scared on these cheap kits
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Post by 90GTVert on Jan 1, 2011 18:15:10 GMT -5
I was at the understanding that a lot of the Kymco 50cc 4Ts were 50cc GY6s. If that's true, you can get BBKs all over. Never saw anyone build one. I was looking into a crank out of a Kymco for my SunL's GY6... before I decided the 4T just wasn't worth more time and money than I already had invested. Others have said they are the same thing as a 139QMB, but better quality parts. I really don't know, so don't take my advice if you'd heard otherwise from someone that has messed with teh Kymco 4Ts.
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Post by lshigham on Jan 1, 2011 18:49:26 GMT -5
You are correct, Brent. The Kymco 50cc 4T's are your basic 139QMB made with better quality metal and to better tolerances. Polini do in fact make a 47mm BBK for them, but there are plenty others available. This is a pic of the engine of one, familiar? www.scootertherapy.com/agility50.JPG |
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Post by Thebatman on Jan 2, 2011 14:11:43 GMT -5
yeah, that was my understanding also... i just hadnt seen a good quaility bbk for cheaper price yet.. i was thinking i'd be happy with jet,filter,pipe on this one... probably not, but i can think it anyway :spin:
Hey, thats the scoot, cept mines blue..(
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Post by lshigham on Jan 2, 2011 14:35:20 GMT -5
yeah, that was my understanding also... i just hadnt seen a good quaility bbk for cheaper price yet.. i was thinking i'd be happy with jet,filter,pipe on this one... probably not, but i can think it anyway  Hey, thats the scoot, cept mines blue..( Yes, I started off thinking that. It never materialised though. |
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Post by 90GTVert on Jan 2, 2011 15:24:48 GMT -5
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