RCU Forums - View Single Post - Saito 125 poor performance problem
Thread: Saito 125 poor performance problem
View Single Post
Old 12-20-2008 | 12:58 AM
  #51  
DarZeelon's Avatar
DarZeelon
Senior Member
 
Joined: Apr 2003
Posts: 8,913
Likes: 0
Received 6 Likes on 6 Posts
From: Rosh-HaAyin, ISRAEL
Default RE: Saito 125 poor performance problem

ORIGINAL: rlmcnii

And this volume is not forced out of the crankcase... Only a very small percentage of it is. This volume is not drawn into the crankcase as the piston rises either.
I assumed not, thus the statement concerning the efficiency of the process. If you are correct, and I do not doubt that you are, the process is very inefficient.
You're welcome, Rlmcnii.

This has nothing to do with low efficiency...

Please imagine a fully isolated syringe, with its piston pulled all the way back and your finger plugging the only exit...
If you push the piston in, to compress the air that is inside, it will heat up.
If you release the piston, it will return nearly (friction) to its previous, fully extended position. No great work loss!

The work done, as the air expands and cools is equal to the work done when you compressed it and caused it to heat up.

This is in general what happens in the crankcase of a four-stroke engine...


This is off-subject, but was necessary to clear up a misconception.
DarZeelon is offline  
Reply Like