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Pastimes : Auto Repair & Maintenance Tip
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To: WTMHouston who wrote (73)11/6/1999 2:16:00 PM
From: kormac  Read Replies (1) of 134
 
Hello Webmister and Troy

I am a mechanical engineer, but not any kind of specialist in automotive engineering. I have through the years tried to learn something about keeping my cars running, but have only paid enough attention to understand ONLY the most common problems.

Troy, your methane exhaustion system illustrates the nature of pressure waves well. So if you happen to exhaust at the same time as someone near you, the two pressure waves collide and you do not get the nice kind of wave motion in one direction that you would get in a stratified charge engine. This BTW is why the Honda engines have a precombustion chamber. The idea is to get the pressure wave to propagate evenly to the top of the cylinder where the energy from the combustion can be converted to mechanical energy of the piston. If you can't get this done efficiently, the energy leaves the cylinder as HOT exhaust gases and a load on your cooling system. Thus the efficiency of the engine goes to the "pot" i.e. the same place that the methane exhaust system should discharge. :-)

I have a 1992 BMW 325i and I have not experienced the problem with shimmy. It has had a problem with the ignition switch ruining the starter motor 3 times so far. Last time the ignition switch got changed and hopefully this will not happen again.

Ron, I did not know that today cars have sensors that detect knock and adjust the spark advance. Interesting !

cheers, Seppo
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