Interesting. So basically at the end of the exhaust-stroke/beginning-of-the-intake-stroke the extra ports scavenge the exhaust gasses out of the cylinder using fresh air (no fuel)
Very interesting thank you for the explanation I was curious about the strato design because I just bought a Jonsered 2172 and was wondering why it was different from the 2171. I learned an interesting scientific fact over the years and would like to share. Engines just like humans are not capable of "sucking" in air. The air whether drawn in by an engine or by someone's lungs is actually the direct result of a difference in air pressure created by movement or contraction. Air pressure is around 14-15 pounds per square inch at sea level. If there were no air pressure we would not be able to breath and an engine would not run.
Excellent explanation but to some manufacturers like husqvarna and jonsered the term coined is actually called a stratified design. Or stratefied charge. I do like your idea of the tunnels, any videos to show the difference?
Where it's got the little side covers on the outside of the cylinder,if the gasket was leaking would you lose compression? I bought a non running 550xp with a toasted piston. The cylinder looked fine,so I put a new meteor piston and caber ring along with an oem base gasket and still only have 90psi of compression. Itll start,but obviously wont stay running. When I bought it the carb base was loose,so I figured that's what killed the piston. What am I missing,should I try a new am cylinder?
So she the fresh air chases the exhaust is the exhaust is the fresh air finishing the burn or is it to just separate the fresh air fuel charge from the actual charge that would probably be more simple and make sense and the combustion has already completed when the fresh air enters the cylinder
Classy work on the intake/strato blending there. I'm impressed.
At last - a demonstration with class! Superb.
Agree, good job on explaining a Strato engine.
Invented the damn thing, lodged a Patent Application in 1989 and submitted it to manufacturers worldwide - no interest.
Interesting. So basically at the end of the exhaust-stroke/beginning-of-the-intake-stroke the extra ports scavenge the exhaust gasses out of the cylinder using fresh air (no fuel)
good and accurate info, thanx
Very interesting thank you for the explanation I was curious about the strato design because I just bought a Jonsered 2172 and was wondering why it was different from the 2171. I learned an interesting scientific fact over the years and would like to share. Engines just like humans are not capable of "sucking" in air. The air whether drawn in by an engine or by someone's lungs is actually the direct result of a difference in air pressure created by movement or contraction. Air pressure is around 14-15 pounds per square inch at sea level. If there were no air pressure we would not be able to breath and an engine would not run.
Excellent explanation but to some manufacturers like husqvarna and jonsered the term coined is actually called a stratified design. Or stratefied charge. I do like your idea of the tunnels, any videos to show the difference?
Thank you!!!!
Where it's got the little side covers on the outside of the cylinder,if the gasket was leaking would you lose compression? I bought a non running 550xp with a toasted piston. The cylinder looked fine,so I put a new meteor piston and caber ring along with an oem base gasket and still only have 90psi of compression. Itll start,but obviously wont stay running. When I bought it the carb base was loose,so I figured that's what killed the piston. What am I missing,should I try a new am cylinder?
Would you be interested in porting an Echo 550P (strato)? I know your not on AS much anymore but thought id ask!
How big these extra channels should be in sidewalls?
Basically X-rorq Husqvarna.It's also air injected
I Am curious Can you block off the extra ports ? and just use the normal intake port
So she the fresh air chases the exhaust is the exhaust is the fresh air finishing the burn or is it to just separate the fresh air fuel charge from the actual charge that would probably be more simple and make sense and the combustion has already completed when the fresh air enters the cylinder
Here's my 1989 Patent Application for stratified-charge two stroke engine using PISTON CHANNELS...
Stihl is about 20yrs late to the strato party. Husky had it first