Home
Basic Dirt Bike How-To's - Video
Dirt Bike How-To's - Video
Living The Moto Life - Video
Bike Tests | Shoot-Outs - Video
Forums
What's new
Latest activity
Log-In
Join
What's new
Menu
Log-In
Join
Navigation
Install the app
Install
More options
Close Menu
Forums
MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
precision expansion chamber design
Reply to thread
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Message
[QUOTE="jaguar, post: 1423107, member: 19340"] My 55cc bicycle engine (1 speed) has been my ongoing project, first to get it to climb hills without losing top speed and then to experiment with porting and pipes till I really understand 2 strokes. My next pipe will be to try to make it lightly "pipey" although that trashes its usefulness on the street unless I want it for popping wheelies. But where I live now I am practically downtown and I walk everywhere and only use the bike to test things on. Like tonight I tried to test what powerband changes happen when transfer plates are installed that direct the intake charge into the cylinder horizontally. But I ran out of gas before it warmed up and I have to wait till tomorrow to get more gas. I test late at night when theres no traffic and no cops. People think that a flat transfer roof accomplishes a horizontal flow but I totally disagree. The intake flow, at the beginning opening of the port, is determined by the transfer roof and the piston. After that the velocity and inertia of the fuel/air make somewhat more use of the transfer roof. Its all about physics which makes it more complicated especially since the scenario changes as the port opens more and the air velocity increases. fascinating stuff. Been a long time since I have been on this forum. Things have died down a lot. This place used to be smoking! Damn four strokes. that and bad world wide economy. I grew up when half the high school kids had motorcycles. Me and my dad bought a 125cc Penton (forerunner to KTM) for $400. Now hardly anyone has dirt bikes. crying shame. Utopia, whenever and wherever that is, will have lots of dirt bikes. [/QUOTE]
Verification
Which ocean is California closest to?
Post reply
Forums
MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
precision expansion chamber design
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
Accept
Learn more…
Top
Bottom