When should I achieve highest RPM?

Posted on August 24th, 2007 by

I own a 1962 Piper Colt with a O-235-C1B engine. My operator manual says that I should have 115 hp at 2800 RPM. At what point would I achieve highest RPM? On takeoff? Level flight at full throttle? Continue Reading →

How can TBO increase by 33%

Posted on July 20th, 2007 by

Cessna 182s have been burdened by a 1,500 hour TBO for many years. However, the O-470-U engine is now available with a 2,000 hour TBO. What possibly could they have done to the engine to extend the TBO by 33%? Continue Reading →

What’s the best oil for my engine? Our oil expert weighs in on this reader’s question

Posted on July 6th, 2007 by

I have a Lycoming AEIO-360 in my Pitts S1S. I have been running AeroShell 100W Plus for years. Some buddies I fly with have been using an Amsoil oil (I’m not sure the number). What is the best oil and... Continue Reading →

How can I fine-tune idle mixture?

Posted on June 22nd, 2007 by

How about a discussion of the scalloped wheel on the injector pump for an IO540-C4B5 engine? My engine will “”load up”" at idle and I have to run the rpm up to about 1,200 quite often during taxi. Also the... Continue Reading →

What is normal oil consumption?

Posted on June 8th, 2007 by

I have a 2005 Robinson R-44 Clipper II that I purchased new. The engine is a 540 injected Lycoming. I broke the engine in on mineral oil as suggested and changed to ashless oil after the initial 50 hours of... Continue Reading →

What parts can I use in my 1955 engine?

Posted on May 18th, 2007 by

My 1955 Tri-Pacer original Lycoming O-320 engine was torn down and inspected. It has a Part No. 74166 camshaft gone bad (#3). I found a P/N 76097 camshaft. Is it OK to use this part number for the engine? Continue Reading →

Confused about replacement parts?

Posted on May 4th, 2007 by

Q, I have a Lycoming O-320 150 hp engine with no suffix in my PA-22 Tri-Pacer. In one of your articles you list the O-320-A1A and the O-320-A3A as the numbers to refer to for replacement parts. Lycoming does not... Continue Reading →

The XR-7755: The whole story

Posted on April 20th, 2007 by

I was reading about the XR-7755 on the Internet and was wondering if you would clear something up for me. Most sources say there were two engines made, but I’ve found there were three versions. The first was set up... Continue Reading →

Can we convert from dual mag drive to separate drives?

Posted on March 23rd, 2007 by

Can we convert a Lycoming O-540-J3A5D from dual mag drive to separate drives? Can it be done on a 1980 Dakota 236? Continue Reading →

Confusion abounds on difference in rocker arms

Posted on March 9th, 2007 by

I’m confused about the rocker arm differences on the O-360-A4K parallel valve cylinders because I know about the extreme heat that the exhaust valves endure. Continue Reading →