chamber making - xBhp.com : The Global Indian Biking Community

tabish2k · 11-26-2008, 05:27 PM

hello all,
i have a custom yamaha rxz 141cc, i want to knw the foll spec:-
or help me with the calculation.
1)diffuser type- is it a two stage or a three stage?
2)exhaust temprature:-exhaust temprature at maximum power(degrees C)?
3)exhaust port effective diameter(mm)?
4)exhaust port opening angle (deg ATDC)?
5)engine speed at max RPM?

Aryan · 11-26-2008, 06:23 PM

Topic Approved.

mohsihummer · 11-26-2008, 07:56 PM

so u've found the mota expansion chamber utility software.................
it's been around for pretty long.
and don't u need a target BMEP?

tabish2k · 11-27-2008, 04:32 PM

Quote:

Originally Posted by mohsihummer

so u've found the mota expansion chamber utility software.................
it's been around for pretty long.
and don't u need a target BMEP?

hmmm,, its by IWT racing, got it some months bak, but cant do the calculations.... and have no idea wat wil be the temprature in the barrel.. u have an idea?thanx

mohsihummer · 11-27-2008, 06:56 PM

same stuff.
they are the programmers who had programmed the mota 2-stroke engine simulator
and i've no idea on the engine temp's.
trying to build one myself.:lol:

atul_astro · 11-30-2008, 01:45 AM

dude..you'll have to sit down with a vernier caliper and measure ex port width
exhaust temperature is 600 degrees
diffuser can be a three stage or two stage depending on what kinda pipe you're building
and i assume you're using a 2mm oversize piston [kawa] on the RX..hope you haven't forgotten to rework the head diameter to 60mm as well.

i'd also suggest you read up on bell and jennings before you start making a chamber. would help

atul_astro · 11-30-2008, 02:47 AM

atul_astro · 11-30-2008, 01:35 PM

here's a pipe design that's for a high revving bike

mohsihummer · 12-04-2008, 10:32 AM

hey man atul,
what rpm did u design it?
what BMEP?
btw, mine is stock bore,stock piston.which would mean 58mm bore??
i haven't measured it................

atul_astro · 12-04-2008, 08:30 PM

what barrel are you using?..4 speed or 5 speed? and what kinda powerband are you looking for?..depending on that you can chose your bmep. lemme know..i'll make a design for you too

11-26-2008, 05:27 PM	#1 (permalink)
tabish2k two-stroke addict Join Date: Oct 2008 Location: mumbai-50 Posts: 20	chamber making hello all, i have a custom yamaha rxz 141cc, i want to knw the foll spec:- or help me with the calculation. 1)diffuser type- is it a two stage or a three stage? 2)exhaust temprature:-exhaust temprature at maximum power(degrees C)? 3)exhaust port effective diameter(mm)? 4)exhaust port opening angle (deg ATDC)? 5)engine speed at max RPM?

11-26-2008, 06:23 PM	#2 (permalink)
Aryan Senior Member Join Date: Jan 2006 Location: New Delhi/ Shillong Posts: 18,274	Topic Approved. __________________ ...in search of that perfect world - My Travel Blog :)

11-30-2008, 01:45 AM	#6 (permalink)
atul_astro League Apart Join Date: Oct 2008 Location: Andheri [E] Mumbai Posts: 384	dude..you'll have to sit down with a vernier caliper and measure ex port width exhaust temperature is 600 degrees diffuser can be a three stage or two stage depending on what kinda pipe you're building and i assume you're using a 2mm oversize piston [kawa] on the RX..hope you haven't forgotten to rework the head diameter to 60mm as well. i'd also suggest you read up on bell and jennings before you start making a chamber. would help __________________ 83' RD350 HT 96' RXG 97' RXZ 91'RX100>09'RX165 2010' HH ZMR

11-30-2008, 02:47 AM	#7 (permalink)
atul_astro League Apart Join Date: Oct 2008 Location: Andheri [E] Mumbai Posts: 384	__________________ 83' RD350 HT 96' RXG 97' RXZ 91'RX100>09'RX165 2010' HH ZMR Last edited by atul_astro; 11-30-2008 at 03:37 PM.

11-30-2008, 01:35 PM	#8 (permalink)
atul_astro League Apart Join Date: Oct 2008 Location: Andheri [E] Mumbai Posts: 384	here's a pipe design that's for a high revving bike __________________ 83' RD350 HT 96' RXG 97' RXZ 91'RX100>09'RX165 2010' HH ZMR

11-26-2008, 07:56 PM	#3 (permalink)
mohsihummer Member Join Date: Sep 2008 Posts: 48	so u've found the mota expansion chamber utility software................. it's been around for pretty long. and don't u need a target BMEP?

11-27-2008, 06:56 PM	#5 (permalink)
mohsihummer Member Join Date: Sep 2008 Posts: 48	same stuff. they are the programmers who had programmed the mota 2-stroke engine simulator and i've no idea on the engine temp's. trying to build one myself.:lol:

12-04-2008, 10:32 AM	#9 (permalink)
mohsihummer Member Join Date: Sep 2008 Posts: 48	hey man atul, what rpm did u design it? what BMEP? btw, mine is stock bore,stock piston.which would mean 58mm bore?? i haven't measured it................

12-04-2008, 08:30 PM	#10 (permalink)
atul_astro League Apart Join Date: Oct 2008 Location: Andheri [E] Mumbai Posts: 384	what barrel are you using?..4 speed or 5 speed? and what kinda powerband are you looking for?..depending on that you can chose your bmep. lemme know..i'll make a design for you too __________________ 83' RD350 HT 96' RXG 97' RXZ 91'RX100>09'RX165 2010' HH ZMR

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