Sometime back, Dana Overall posted a link to the KRNet, a technical paper about GAMIjectors and operating lean of peak (for operation of the 550 in his his Bonanza). I was reading an article in AOPA Pilot about engine operation LOP and as Dana had mentioned, it's not too practical to do this with a carbureted engine due to the variation in mixture delivered to each cylinder. Attempting to lean past the peak usually results in unacceptably rough running.
So the article gave a tip to try on carbureted engines: apply carb heat in conjunction with the leaning operation and see if you can find a combination that works. Apparently this has been used on Twin Beeches (among others) with good results. Now why would you want to go to all this effort to run lean in the first place? Using carb heat results in a drop in RPM (and power), right? Well, it turns out that the engine likes to run LOP, as the graphs of EGT, CHT, and specific fuel consumption indicate. All of those values drop off as you go LOP. For those out there who want to maximize performance at cruise, running LOP is worth experimenting with. Someone here mentioned Klaus Savier and his Lightspeed ignition recently, and it should be noted that Klaus is one who has made lots of forays into the world of maximized performance... which is how his ignition was developed (performance runs and racing). Running LOP requires looking at things in a new and different way. Which is how Dana operates anyway... but that's another story ;o) Oscar Zuniga San Antonio, TX mailto: taildr...@hotmail.com website at http://www.flysquirrel.net _________________________________________________________________ Find things fast with the new MSN Toolbar includes FREE pop-up blocking! http://clk.atdmt.com/AVE/go/onm00200414ave/direct/01/
