Backpressure

Mormonmopedmaifa · Post by **Mormonmopedmaifa** » Wed Oct 26, 2005 9:09 pm

I was thinkin about drilling out my tailpipe but i saw that it relieves axhuast pressure and i know that is crucial for it to run..... but uhh what exactly is backpressure and why does an engine need it?

darat · Post by **darat** » Wed Oct 26, 2005 10:35 pm

i think back pressure helps with the compression which makes the pistion go up and down if u dont have enough then it wont make the most HP.
That is my guess

Mormonmopedmaifa · Post by **Mormonmopedmaifa** » Thu Oct 27, 2005 10:18 am

no im pretty sure people say engines NEED it ( 2 strokes) to run .

Post by **noiseguy** » Thu Oct 27, 2005 10:26 am

2-strokes are greatly aided by properly designed pipes that acoustically "echo" at the right frequencies. This effectively plugs the exhaust port while the piston is coming back up. All this is more technical/engineering knowledge than most ppl care to pick up, but here's more:

http://www.motorcycle.com/mo/mcnuts/em-pipes.html

Bottom line: Just drill the 4 holes, you'll be fine. Do a search in this section and you'll find an expansion chamber that I built which worked pretty well also.

Mormonmopedmaifa · Post by **Mormonmopedmaifa** » Thu Oct 27, 2005 10:30 am

And what if i drilled 5 holes?? just kidding thanks for the explanation

darat · Post by **darat** » Thu Oct 27, 2005 10:45 am

how did u make ur icon like that?

Mormonmopedmaifa · Post by **Mormonmopedmaifa** » Thu Oct 27, 2005 10:47 am

I used a .gif file. i think they can have like up to 7 frames or sumthin and stay under 10 k if theyre small

darat · Post by **darat** » Thu Oct 27, 2005 10:53 am

no i am saying how did u get them to change like that did u use a program?

Mormonmopedmaifa · Post by **Mormonmopedmaifa** » Thu Oct 27, 2005 10:54 am

yeah its just a .gif . u can make em in flash and fireworks and probly photoshop.