9 votes
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Causes of High CHTs

Your temperatures don't sound all that bad for breaking in cylinders, but you should go back over the baffling. The baffling is there to maintain pressure in the plenum with the help of those rubber ...
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8 votes
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What may be the cause of hot start problems in a Lycoming fuel injected engine?

The issue is undoubtedly vapor lock. In the fuel injected Lyc 540, the fuel injection plumbing is on the top of the engine which is the cold side of the engine when you are flying but when parked, ...
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6 votes

Why does the main battery discharge with the alternator running?

Our mechanic had a similar issue with a Piper Cherokee where the battery would only charge intermittently. It turned out there was a bad connection at the Master Switch which ran from the Alternator/...
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5 votes

How can I decode Lycoming engine number?

I got the following information for this website: Also if you scroll down here you can see the model numbers that you talk about in your question. The last character seems to be an indication of ...
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3 votes

Can coaxial rotors be mounted on a piston engine like the Lycoming O-320?

Stan Hiller's earliest helo designs were coaxial and used relatively small 4-cylinder aircraft engines to drive the coax transmission, so it is indeed possible to power a small coaxial helicopter with ...
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3 votes

What may be the cause of hot start problems in a Lycoming fuel injected engine?

No need to run the fuel pump as @Skip Miller says. (though it may say that in the Saratoga manual) I have done the following with success for hot starts on a IO-320, IO-360, and IO-540. Throttle ...
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2 votes

What may be the cause of hot start problems in a Lycoming fuel injected engine?

I have a 1969 PA 32 300 with 420 hours on engine, for the last 12 months it has been very hard starting after a flight. My MX shop checked the left Mag impulse coupler and coil at 360 hours all ...
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2 votes
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What are advantages and disadvantages of Rotax and Lycoming engine designs?

The biggest difference between these two engine designs is that the rotax contains a reduction gearbox which allows it to turn faster and hence develop more power per cubic inch of displacement, and ...
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1 vote

Why is the RPM limit on a Lycoming IO-540 different in the -C and -D versions?

Those engines have different valve configurations, which mean they "breathe" differently. Better breathing supports more RPM's before the engine runs out of puff, so the most probable cause ...
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1 vote
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Carb Heat and Lycoming Engines

It's because the spider duct that connects the carb to the intake runners going to the cylinders is cast into the oil sump and the carb mounts directly to that. So the carb gets a lot of engine heat ...
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1 vote
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What modifications need to be made on an engine that normally uses AVGAS to utilize it with MOGAS?

STC aside, no physical modifications are required to an engine to run on Mogas (except possibly the fuel system - see below). My Lycoming O-290 has been using it for 9 years with no issues, and in ...
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1 vote

What modifications need to be made on an engine that normally uses AVGAS to utilize it with MOGAS?

For any certificated aircraft engine, the type certificate will specify the required fuel. If the TC specifies AVGAS, using MOGAS will require an STC for that engine. Developing a MOGAS STC for an ...
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1 vote

What may be the cause of hot start problems in a Lycoming fuel injected engine?

Also have the injectors checked. The symptoms you describe can occur when one of the injectors is not closing completely, causing flooding or an overly rich mixture.
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