expansion chamber physics equation needed

GoldenMotor.com
P

perichbrothers

New Member
Jan 17, 2010
55
0
0
san diego
Ok,
I was wondering about expansion mufflers or expansion chambers.
If an engine is a 66 cc,
what is the formula for how big the expansion chamber needs to be?

The exhaust explosion is way bigger than 66 cc right?

So I guess first off,
what is the actual displacement of the 66 cc engine?

then second,
what is the equation for exhaust displacement?


It seems that alot of the mailorder kits were made for the 49 cc engine,
so its actually not optimizing the bigger engine.
Was thinking of making one just for kicks.

Thanks alot guys.

TP
 
W

wildemere

New Member
Feb 12, 2008
269
0
0
Newcastle
Google Gordon Jennings or Graham Bell

Its all there.

There is also software that calculates pipe dimensions.

You will need some good data to input though.

Like exhaust temperature, fuel type, ect.
 
Homeless Bob

Homeless Bob

New Member
Feb 25, 2010
43
0
0
Louisiana
Greetings guys..

Been reading to learn what not to do as I prepare for my first buy/build...

Thanks for all the help so far! Your sharing has educated this old man more than I could express...

As for the stuff by Jennings and Bell, I have a couple of links I can share.

The Two-Stroke TUNER'S HANDBOOK can be found here: www(dot)datafan(dot)com/TunersHandbook/2-strokefiltered.html

And

Performance Tuning can be found here : www(dot)kreidler(dot)nl/artikelen/performance-tuning-graham-bell/performance-tuning-graham-bell.pdf

Hope this helps!

.shft.
 
otis

otis

New Member
Mar 7, 2010
28
0
0
Canada, Kingston,Ont
i have a grubee 48cc with the catalytic type black exhaust ho do i upgrade it and why wont my bike hit full rpms its like it has a govenor in it untii it maxes out at 45kmh, i already matched all ports, wide open burn is a nice tan on the plug how do i get that full throttle rpm up everyone give your 2 cents i would appreciate all help PLEASE HELP PLEASE HELP PLEASE HELP !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 
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