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GOTCHAS: * Each cylinder on a carbureted engine behaves differently, both in peak temperature and in when it peaks as related to other cylinders. This is due to the unequal mixtures and flows to the different cylinders and unequal exhaust flows. Therefore, a single EGT/CHT gauge will tell you only generally what is going on with the engine. An "Engine Analyzer," with readings for each cylinder gives you the entire picture but (IMHO) is overkill and too much information for an O-200. * If your EGT has actual temperature readings, they can't be compared directly with other aircraft due to changes in probe placement and calibration. Only the differences in reading from time-to-time are really important. If your EGT was installed correctly it will serve as a backup to the peak and enrichment using the tach. You should expect to see approximately 25-50 degree drop below peak readings as you enrichen from peak RPM a get a smooth running engine. 100 degrees below peak is very rich and needed only during climbs in hot conditions. (Don't know where you've read 100 degrees - some fuel injected engines may be run at peak or even on the lean side.) BTW, it is also OK (and probably better for the plugs) to not touch the mixture on descents, but to keep it lean right down to pattern altitude. In NM you are always leaning, even on the ground, aren't you? * On the Alon, the CHT is required and is placarded "525 deg max." David N6359V [EMAIL PROTECTED] wrote: > > Well, let's see if I can get a new discussion going. A couple of months > ago I bought a 415-D, converted to an O-200. Being a low time pilot, > I'm not really familiar with the CHT and EGT gauges. The Cessna's I > trained in didn't have a CHT or EGT. We leaned by watching the tach. > What are the normal temps? What sort of clue about engine operation can > I get from them? Are there absolute maximum temps that I should watch > for? I've been told to lean to max EGT and then enrich the mixture > about 100 deg. below peak. I've read this enough different places that > it's probably a good procedure, but are there any hidden "gotcha's" to > doing this. Any and all comments will be appreciated. > Dave in (not so sunny) Alamogordo, NM > N93971 __________________________________________________ To unsubscribe from this list please send mailto:[EMAIL PROTECTED] ____________________________________________________________ T O P I C A -- Learn More. Surf Less. Newsletters, Tips and Discussions on Topics You Choose. http://www.topica.com/partner/tag01
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