CHT on all cylinders

[Terence Howard]

I just had all cylinders rebuilt on my 62 PA24 250. My engine guy says to forget about using the egt and only lean referencing the hottest cylinder. He recommends me installing a multi probe CHT. any thought or comments on this.

[9089P]

Well multi-probe engine analyzers are nice and do give a lot of information. But if leaning the engine is all you care about, a single probe on the hottest cylinder has served us well for many years. You could also resort to the tried and true method of leaning to rough, enrich to smooth and turn a bit more. We have a single probe JPI and it works well.

Thanks, Don

[Phil Bridges]

There is an excellent webinar on the EAA website by Mike Busch concerning using EGT and CHT. It is entitled "The EGT Myth" and has some very good information on what is important when setting mixtures. Go to http://www.eaa.org, look under multimedia for videos, then on the left hand side of the resulting page for webinars, and then click on the appropriate webinar. Mike is a long-time pilot, aircraft owner, and was the 2008 FAA Aviation Maintenance Technician of the year.

[Terence Howard]

Thank you both for your replies. I will check out the webinair.

[Jay]

Assuming that's a carbureted 250, leaning to rough then back to smooth will be pretty close. I'm a big believer in engine monitors, but you get the biggest bang for the buck in injected tubo engines, less in NA injected engines, least of all in carbureted engines. All just my opinion.

Jay

[Mark Anderson]

Phil, thanks for the link to the webinar. Watching that made me realize how little I new about leaning. I feel like I have a much better understanding now. I look forward to the one next month on magnetos.

Thanks

Mark

[Terence Howard]

Thanks Phil, I agree with Mark. That was truely a great Webinar on leaning. First webinar for me. I will be checking out the one on Mags next month.

Jay, from what I learned from the webinar, sounds like I need to get a 6 cylinder CHT even though I am a carbureted na.

Thanks,
Terry

[Tom Veatch]

Mike hosts a free webinar the first Wednesday of every month. His website, savvymx.com, has an archive of about 15 past seminars on various subjects. Highly informative anytime you have an hour or so free and want to expose yourself to a possibility of learning something:

http://www.savvymx.com/index.php/resources/webinar

[Terence Howard]

Thanks for the info and the link Tom.
Terry