Ask Paul: Why do my serial numbers differ?

Posted on May 2nd, 2010 by

A: I have a narrow deck configuration in my 1964 PA 30-270. The first entry in the aircraft logbook, made on Jan. 3, 1964, shows radio installation and LE serial #S or L 606-55 and the RE L 640-55. However... Continue Reading →

Ask Paul: The seal of approval

Posted on March 29th, 2010 by

Q: We’re building an RV-6A using an O-360 narrow deck engine. There are six studs that hold this engine together. The center studs are wider at the base than the outer four studs. The case has an indentation where the... Continue Reading →

Ask Paul: Use it or lose it

Posted on February 24th, 2010 by

Q: I am considering buying a plane with a Lycoming 540 factory rebuilt engine. TSOH is 50 hours. The problem is the engine was installed five years ago with a new turbo and the owner has not flown it much... Continue Reading →

Ask Paul: More on hot engine starts

Posted on February 3rd, 2010 by

Q: I’d like to offer my response to a hot engine start (What is the procedure for a hot engine start?). If I know I’m going to have a quick turnaround after engine shutdown, this is what I do: I... Continue Reading →

Ask Paul: Why are Piper and Cessna mag checks different?

Posted on February 1st, 2010 by

Q: During a checkout in a Piper Cherokee, (I had only Cessna experience), I asked the CFI why Piper has me check the mags at 2,000 rpm and Cessna at 1,700 rpm on what is, essentially, the same engine? My... Continue Reading →

Will my engine benefit from new technology?

Posted on December 28th, 2009 by

Q: The O233 LSA engine uses the new E-mag electronic ignition that they say advances the timing to 38° BTDC, much like other systems. Does this much spark advance also have Lycoming’s blessing for the O320 and O360? I realize... Continue Reading →

What is the procedure for a hot engine start?

Posted on November 11th, 2009 by

Q: I have a Grumman Yankee Model AA-1 with a Lycoming O-235L 108-hp engine. What is the procedure for a “hot engine” start? When I shut down the engine, I run it lean at 1,800 rpm for about 10 seconds... Continue Reading →

Ask Paul: Narrow deck cylinders, the Twin Comanche and a Lycoming milestone

Posted on October 20th, 2009 by

Geez, it’s really beginning to look like I’m losing it when it comes to misstating things in my columns. The most recent concerned the “Wide Deck” vs “Narrow Deck” cylinder column in my last column. I thought I’d explained the... Continue Reading →

Ask Paul: Wide deck vs. narrow deck engines

Posted on October 7th, 2009 by

I recently received a question from a friend of a friend in Texas regarding the difference between a “Narrow Deck” and a “Wide Deck” Lycoming engine. This has been confusing to many, so let’s see if I can shed some... Continue Reading →

Which cylinder is where?

Posted on September 10th, 2009 by

Q: Over the last three years of annuals I have had three different mechanics. The mechanic does the compression check, calls out the cylinder number and I record the values. It appears to me that the mechanics might be confusing... Continue Reading →