Quote:
Originally Posted by tpssonic
There are no stupid questions,
"As for the "Stinky Exhaust" what are you saying?
Is it some thing that can be measured with an A/F meter?"
I assume (bad thing sometimes) you are talking about at idle. The answer I have is "possibly"- to a point. You can have a decent A/F mixture, but if you have a lot of overlap (both intake and exhaust valves open due to valve timing events) the air/fuel charge can go in the intake and straight out the exhaust (short-circuit). That being said, you can also have "stinky" exhaust with a LEAN A/F mixture. On the dyno when testing two-stroke engines, I know when the mixture at WOT is "right" as verified by highest engine output, plug reading and piston wash reading; there is an acrid smell that burns your eyes that you only get when the engine is "spot on" at full wail. Switching gears here (pun intended) with swimming pools, the reason a pool "smells like chlorine” isn’t because there’s too much chlorine in it; it’s the result of chlorine mixing with various nitrogen and ammonia compounds and creating chloramines. In effect most all of the free active chlorine (available for disinfecting) is bound up; so in actuality you have TOO LITTLE chlorine.
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So ( correct me if I'm wrong) a lot of overlap sends a lot of fuel in to the combustion chamber not only creating a stinky smell( and burning eyes) but washing the cylinder walls (washing oil away and accelerating crosshatch wear) ?