Dissapointing performance

Dusterguy said
I bellieve that you have experience in things you said. I respect your opinions but I still disagree with you how headers work.

When exhaust valve closes then there is exhaust gas traveling trought header/primaries. The inertia of gas makes low pressure/vacuum to the combustion chamber and that low pressure/vacuum suck new air/gas mixture from intake to combustion chamber. Thats most important thing how headers work/makes scavenging effect.

So exactly what I said....

The exhaust creates the scavenging affect. Which HELPS evacuate the cylinder of burnt gases. Cam overlap, collector length, primary tube size and length. Among so many other things help. But it ONLY HELPS. The majority of the vacuum that pulls in air/gas is created by the piston on the intake stroke. That's Otto engine 101. You really should know that. Scavenging is basically cleaning the cylinder before you draw fresh air in it. Ideally scavenging would pull out alllll the exhaust, and just start to pull a little of fresh air/fuel so that the cylinder is only compressing all new fresh air and fuel. That's scavenging.

Read Cudafevers post. He goes into some detail about it (excellent post btw cudafever). More than I think you can/are willing to understand. And more than I am willing to try and explain to you. I could sit you down for 8 hours and go into extreme detail about exhaust/scavenging/cam overlap/quench/combustion burn rates/timing and its affect on exhaust/exhaust temperature indications/dual vs single pattern cams and their exhaust impact/etc/etc/etc. And still not give you 1/4 of the education you need.

I don't know what part of my post you didn't understand. But it seems like all of it. Cause you tell me you disagree with me how headers work. Then basically repeat back exactly what I said. You need to really read and comprehend the posts here. I'm starting to think that's a large part of the problem.

Dusterguy said
If you are dealing with 4 cylinder engine or flat plane V8 like Ferrari, then you can take advance of primaries lenght tuning. That is another thing how headers can make scavenging effect and it works different way than what I desribled. There is also collector length tuning thing but I dont understand it enough that I could talk about it.

I would love for you to tell me what the difference is between a 4 cylinder (which is basically a single bank V8) or flat plane (boxer style) VS a V8 exhaust. Exhaust flows out no matter what way the engine faces. Upside down turn it around. Exhaust still flows. Ask me how I know (I also have aircraft experience, including stunt/redbull planes).

You don't know enough about collector length tuning. Because you don't know enough about headers/exhaust. Period.