Originally posted by Eric2004
So do you think there is a real significant difference in terms of power output between the old and new engine? Or was the effect only placebo ( you know, nova produce a new engine, people think it is "new" and must be more powerful, so when they run it, they think it is more powerful where in fact it is the same. or the difference is insignificant.)
By the way what is the conrod length and stroke ratio? Haven't heard of it? How does it effect the performance?
I am sure it is placebo ( first time hear this word).
This value is also called conrod ratio. It is very important number and it was banch of theories about it, but so far good number is between 1.78 to 1.83. it is actualy related very close to power band and depend of aplication is changing. Bigger # move power band to torq side, smaller # move power band to RPM side ( it is simple answer, actualy it is much more complecated and realy don't want to go further and will not).
Our engines aren't that easy and realy complecated ones you start design something. I wasn't do any calcuations for more then 10 years, till now. And now luckely all my old notes are with me.