Armilite
Well-Known Member
Looks like a Handy Tool if you build 2 Strokes!
[FONT=Arial, Verdana]Squish Velocity Calculator[/FONT][FONT=Arial, Verdana] [/FONT] [FONT=Arial, Verdana]Gordon Blair recommended 15-20m/s squish velocity at the peak power RPM. (I think that was “cold” because there's never been a calculator showing the hot values). To be able to stick to his recommendations this calculator figures the velocity both for top RPM and for 1000 less (for peak power RPM). As a test case we can look at the '89 Honda CR500 which had a detonation problem from too high a squish velocity. I was able to gather all the details but I had to assume a 2 degree squish angle. At 1000 RPM less than its peak 7700 its cold velocity with a 2 degree angle was 22.1m/s and with Eric Gorrs fix of lessening the squish band from 18mm to 15mm the velocity became 18.1m/s. Since 2 degrees squish angle is the normal max I'm going to agree that Blairs 20m/s is the max before detonation. Click here to read up on this topic. You can email me at 19jaguar75 @ gmail.com with any questions or just to chat. [/FONT] [FONT=Arial, Verdana]Click here to buy my squish velocity calculator for $10. Also check out my expansion chamber info[/FONT] [FONT=Arial, Verdana][/FONT] |