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Author Topic: New to The forums  (Read 9156 times)

whiteknight

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Re: New to The forums
« Reply #75 on: April 07, 2012, 09:02:58 AM »
i have heard the same about those types of exhaust summit about how on two strokes the sound waves sumhow drag more gasses out or summit like that. i have seen Naraku crossover exhausts not sure if its just gimmicky but they say they are specially tuned for four stroke engines and arnt desinged in the same way a 2 stroke version is....i think.
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2010 Kymco Agility 72..Naraku 72cc race cylinder...Naraku 50cc race head
Naraku Race CDi...Polini free flow filter...Motoforce Racing Carb
NGK Irirdium plug...Naraku Race Variator...Malossi fly clutch
Stage 6 cnc clutch bell...1500 Rpm torque sprin

zombie

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Re: New to The forums
« Reply #76 on: April 08, 2012, 03:21:08 AM »
Expansion pipes are really simple echo chambers. The principle is the returning "echo" pushes the mix back into the jug. When the Exh. port is open, and the transfers are fully de pressurized some of the New mix flows out the Exh. port. The echo from the pipe pushes That mix back in. The idea of tuning is to match the Peak power of the Cyl. to the return pulse of the pipe. Dyno tuning is really needed to get it EXACT but matching your parts is critical to getting everything working together.
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zombie

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Re: New to The forums
« Reply #77 on: April 08, 2012, 03:24:54 AM »
FORgot... These pipes will create a sound wave that WILL push valves into a "float". It can send a wave that will open the Intake valve while the exhaust valve is open. This is an exaggerated scenario but the idea that makes it happen is not.
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thebatman

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Re: New to The forums
« Reply #78 on: April 09, 2012, 12:22:34 AM »
It's a techy pipe from SPI, but it's listed for the ag, you can see the header joint, looks good.
 But i guess that thought needs to go..  :-\ I'm a fan of the ex ch. design, They'd make any scooter look good..  ;)
I'll get a cheap "shorty" some day soon... ::)...........have to be the matching blue tho.. ::)
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whiteknight

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Re: New to The forums
« Reply #79 on: April 09, 2012, 12:38:48 AM »
hmmm sounds quite technical to me, might have to brust up on sum homework. for now i might just get either a leo vince or summit close to. but i will also need to upjet and either derestrict the oem filter or buy a high flow.
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Courage is measured in how much tyre you use.

2010 Kymco Agility 72..Naraku 72cc race cylinder...Naraku 50cc race head
Naraku Race CDi...Polini free flow filter...Motoforce Racing Carb
NGK Irirdium plug...Naraku Race Variator...Malossi fly clutch
Stage 6 cnc clutch bell...1500 Rpm torque sprin

wordslinger

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Re: New to The forums
« Reply #80 on: April 09, 2012, 12:41:23 AM »
..in my opinion, the free-flow air filter is the BEST mod to air-flow that you can do to a 4t...

..exhaust...not so much needed....in my experience...
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thebatman

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Re: New to The forums
« Reply #81 on: April 09, 2012, 12:49:00 AM »
..exhaust...not so much needed....in my experience...




They do give a sound tho... :D
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wordslinger

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Re: New to The forums
« Reply #82 on: April 09, 2012, 12:50:19 AM »
..this is true!!!...the vince sounds goooood....
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whiteknight

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Re: New to The forums
« Reply #83 on: April 09, 2012, 12:54:14 AM »
Quote from: wordslinger on April 09, 2012, 12:50:19 AM
..this is true!!!...the vince sounds goooood....

hmmmmm but would that be a good enuf reason to get one  ::)  i do like abit of a grunty noise.
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Courage is measured in how much tyre you use.

2010 Kymco Agility 72..Naraku 72cc race cylinder...Naraku 50cc race head
Naraku Race CDi...Polini free flow filter...Motoforce Racing Carb
NGK Irirdium plug...Naraku Race Variator...Malossi fly clutch
Stage 6 cnc clutch bell...1500 Rpm torque sprin

thebatman

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Re: New to The forums
« Reply #84 on: April 09, 2012, 12:56:02 AM »
Even with the holes drilled in the pipe...
A 4t just don't have any "ass" with stock pipes... :D
(not that a single pipe will give it any more ass.  ::))





BUT, i bet a pipe and a camshaft would help and still leave her stock
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wordslinger

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Re: New to The forums
« Reply #85 on: April 09, 2012, 01:03:09 AM »
..yeah, changing crank, camshaft and stuff ...all that you can pep them up good!!!


..i gave the 08 drilled pipe to a bud onna vip...he LOVES IT!!!
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whiteknight

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Re: New to The forums
« Reply #86 on: April 09, 2012, 01:09:08 AM »
sounds like a plan. my mate is gonna be doing sum work on my scoot, he also has a Agility 50 but it has a 80cc BBK and sum big arse exhaust makes one hell of a racket  ;D
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Courage is measured in how much tyre you use.

2010 Kymco Agility 72..Naraku 72cc race cylinder...Naraku 50cc race head
Naraku Race CDi...Polini free flow filter...Motoforce Racing Carb
NGK Irirdium plug...Naraku Race Variator...Malossi fly clutch
Stage 6 cnc clutch bell...1500 Rpm torque sprin

wordslinger

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Re: New to The forums
« Reply #87 on: April 09, 2012, 01:24:20 AM »
.you do need an exhaust if you throw a kit on dat bitch!!...
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whiteknight

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Re: New to The forums
« Reply #88 on: April 09, 2012, 01:40:41 AM »
i was only planning on doing sum bits to the engine like cams, crank and that. dont wanna big bore it because it will just melt...dont want that, i just want to perk her up abit :P
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Courage is measured in how much tyre you use.

2010 Kymco Agility 72..Naraku 72cc race cylinder...Naraku 50cc race head
Naraku Race CDi...Polini free flow filter...Motoforce Racing Carb
NGK Irirdium plug...Naraku Race Variator...Malossi fly clutch
Stage 6 cnc clutch bell...1500 Rpm torque sprin

wordslinger

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Re: New to The forums
« Reply #89 on: April 09, 2012, 01:43:58 AM »
...bbk is easier...aaannnd, if its jetted right will not melt...

..i know of 3 local chinese scoots that have 70-72cc kits that run very well!!!

..two have tecnigas next pipes, and one has the leo..

..leo sounds gooood...

               :o
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