Cycle to Cycle Pressure Variation
I have been kind of busy studying to be a Master and Commander of the high seas, but during my deep studies I was planning my next blog entry.
In Jim’s original technical analysis of the Rand Cam Engine he outlined many of the technical problems of the piston engine beginning with pre-admission.
Then he would move on the post-release. But I think the point was lost in the technical jargon. Basically what was happening, the exhaust gases from one cycle was contaminating the next cycle. (Valve overlap)
The net result of these abnormal events is that in one cycle the peak pressure would be say 2,000 psi and the very next cycle in the firing order would be 2,500 psi.
In low power engines this difference would not have much affect. However as power levels start to increase then longevity and reliability are affected. In racing engines the usual result is a blown engine because the peak pressures are so high.
The shown graph is extreme but shows clearly cycle to cycle pressure variation. I was reviewing one of Tesla’s patents and realized what he was trying to do. Tesla realized that one of the problems of his turbine was this cycle to cycle variation.
Jim claimed that the RCE eliminated all these problems. However the complexities of combustion is not that well understood by the best engineers on this planet. So who is Jim to tell these engineers how to solve these problems?
My solution would address the problem, and by the way direct fuel injection is only 25 percent of the solution:)