Ask Paul: Why are my #3 cylinder CHTs so high?

Posted on January 8th, 2013 by

Q: Recently — 50 hours ago — I had a Lycoming O-360-A4A overhauled with new ECi Titan steel cylinders installed. The #3 cylinder has had high-ish CHTs from the beginning. Continue Reading →


Ask Paul: What are these aluminum specks?

Posted on December 10th, 2012 by

Q: I lost the left mag on my O-540. When I took it apart, I found four aluminum specks in the top oil screen. I pulled the rear housing off and found the aluminum gear still in the engine. I... Continue Reading →


Ask Paul: What’s the best engine for my Pacer?

Posted on November 5th, 2012 by

Q: I plan to install an 0-360 with a constant speed prop in my Pacer, replacing my 0-320-A1A. I have a couple of engine choices under STCs, including the 0-360-C1A. I am looking for the lightest engine. Was this made... Continue Reading →


Ask Paul: What to do about oil-fouled plugs?

Posted on November 4th, 2012 by

Q: My partner, Lou, and I just had our Piper PA 28 235 overhauled and are having problems with the lower plugs getting oil fouled. The plugs have been cleaned a couple of times but she runs rough and they... Continue Reading →


Ask Paul: What’s going on with my spark plugs?

Posted on October 7th, 2012 by

Q: I have a 1962 Piper Cherokee 160 with the O-320-D2A engine. The engine had a complete overhaul in 1992 and only 500 SMOH. In addition, 20 hours ago the engine had an annual in which an oil change was... Continue Reading →


How to break-in your engine

Posted on September 5th, 2012 by

I recently received a letter asking about engine break-in following overhaul. This is a subject that should be of interest to everyone, even though you may never actually have the opportunity to break-in an engine during your flying years. Continue Reading →

The importance of keeping current

Posted on August 6th, 2012 by

Q: I have a Glasair with a Lycoming IO-360-B1E engine. After reading your article in the May 11 issue, I tried to get a copy of Lycoming’s SI1325A to see if I should change the timing from 25 to 20... Continue Reading →


Ask Paul: Too much information about our engines?

Posted on July 1st, 2012 by

Q: I have a factory reman Lycoming O-540 E4B5 with 300 hours and 2.5 years on it. At idle (1,000 rpm), my JPI is showing alarms on the #1 EGT for having a large differential — #1 EGT is only... Continue Reading →


The marriage between piston rings and cylinder wall

Posted on June 3rd, 2012 by

Q: I am an A&P, and have been in aviation since 1990. I once worked with another mechanic who told me that if you pull a piston out of a cylinder, you must replace the rings and hone the cylinder.... Continue Reading →


Ask Paul: What is the correct timing for my engine?

Posted on May 8th, 2012 by

Q: I have a Lycoming IO-360-A1A on a Mooney E model. My mechanic tells me that there are two timing settings for this engine: 20° and 25° BTC. The engine had been set at 20° BTC and he reset it... Continue Reading →