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Bill, at .5 mach only a tiny portion of a second is required for the fuel to travel the length of the runners. There is no evidence that I am aware of that that the events you describe stumbles, misfires, backfires or even shut downs really occur. In fact there is no reason to think that "fuel accumulates" on the inside of the runner to any appreciable amount. At .5 mach it might just as easily be scrubbing itself off the runner. But you might be guessing rightly. Until we test more, we really cannot say. Jerry
On Monday, June 20, 2005, at 03:37 PM, Bill Dube wrote:
As I understand it, the main problem with placing the injectors far from the engine is that during wide open throttle fuel coats the walls of the manifold. Then, when you suddenly shut the throttle, this fuel evaporates causing an extremely rich mixture. This can cause a stumble, misfire, or even a backfire.
The other problem is that when you suddenly open the throttle, the pressure goes up immediately (as does the density) but it takes a while for the fuel to get the the other end of the manifold. This results in an overly lean mixture when you abruptly open the throttle. This can cause a stumble, or even a complete shut-down, of the engine.
If you always operate the throttle slowly, (like in an airplane) this is not an issue.
Bill Dube'
Homepage: http://www.flyrotary.com/
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