Total Cylinder Equilibrium

well not all cylinders are going to be as efficient as the rest. Some will combust perfectly and another may detonate. Reading the spark plugs is the simplest and quickest way to adjust individual cylinder trims for fuel and ignition. I haven't quite gotten the eye for reading the fuel yet, but im slowly learning that part. Ideally you would want to have EGT probes on each exhaust runner primary and the cool hip spark plug adapters which can log cylinder pressure. Match EGT's and cylinder pressure and you essentially have 4 equivalent cylinders.

• This is all about pulse tuning and getting each one as similar to the one in front of it and coming up behind it. I mean it makes sense. Think about the point of a merge collector with equal length runners. Do you really think that each pulse has the same velocity behind it as the others in front and behind it? You are going to have varying velocities which are going to interrupt each other and decrease the value of the header.
• Say you have one pulse going through the collector moving really fast and one behind it moving slower. Then the pulse behind the slower one moving faster. They enter the collector at the wrong times and the low pressure which you are trying to achieve that sucks the following pulse through the collector is hindered and you lose velocity and engine efficiency. Basically you are creating turbulence. IMO compression testers can be really good predictors of the differences in which each cylinder is going to differ but i don't have any evidence to back that up.