Almost guru Voodoo in the past, five-gas exhaust analyzers and inexpensive A/F measuring equipment makes it more scientific, and
your results more successful.
The valve end of the roller rocker is moving in an arc and the valve is moving in a straight line, which means that the roller is going to move across the top of the valve to some small degree no matter what you do.
The second installment talks about how they’re all part of a system that includes various clearances, gas porting, & piston rockover, shape, & stabilization.
If the PCV (Positive Crankcase Ventilation isn’t working correctly, it can cause problems that range from poor idle quality and serious oil leaks to sludging and internal engine damage from oil contamination. Every piston engine no matter how well designed and assembled has a certain amount of blow-by past the rings, and if it can’t get out of the crankcase pressure will build up and water vapor, excess gasoline, and combustion contaminants will collect in and dilute the motor oil.
Backpressure can seriously sabotage your efforts to get plenty of air into the cylinders, yet many people overlook it and don’t know how to detect its presence. And how is the MAF sensor affected?
In this installment of Greg’s great exposition of high-performance rocker arms, we’ll be looking at the science and geometry involved, which you really must understand before you start building an engine.
