Hmmmm, As a ChemE myself, this is not my direct area of expertise, but I believe scavenging is a myth. It is the concept that exhaust leaving a cylinder creates a pulse down the tail pipe pulling a vacuum behind it (as if it were a piston in a cylinder ). Makes no sense. While there may be pressure pulses down the tail pipe, ALL the gases down the tail pipe are EXPANDING constantly. While there may be high pressure pulses coinciding with exhaust valves opening, there is never any time when the gases are drawing any kind of vacuum behind them. The “pulses” consist of a wave of very-high pressure peaks with lower high-pressure valleys between them, never a vacuum. When I put on my gear-head turn-wrenching hat, this is supported by the fact that dragsters and other ultra high power engines have little or no tail pipe present. One of the most important purposes of tail pipes when you consider everything, is that limiting the exhaust flow allows the exhaust fumes to act as a “coolant“ so you don’t burn your exhaust valves prematurely: longevity is not a consideration in quarter-mile cars. “Back pressure” is necessary for valve cooling, and it actually hurts horsepower.
But again, not my area of expertise, I may be confusing it with something I learned about cockroach farts.
I believe I have stated in almost every reference to Rick’s Ranger Rig that it has nothing to do with a need, common sense, smart spending or any other rational concept. It will be safe and functional, but it is all for therapy…
In summary, the entire project is akin to taping a sausage to your leg and going to the disco. The dual exhausts are simply a sweetener that makes my sausage hard.
and in closing:
i uważajmy na polskie żarty.
(let’s be careful with those polish cracks!)