REFLECTOR:Timing Change for Lycoming IO 360 C Engines?

[Brian Michalk]

What's the compression ratio of this engine compared to the other IO360
variants?  It could be because it is higher in this particular engine.
Also, is the cylinder dome (squish volume) geometry different in this engine
than the oer flavors?

My guess is that they are having detonation problems.

The downside is that retarding the timing will also decrease the horsepower
or efficiency.  Pick one, not both.

I would sure like to see the horsepower curves with these two timing
changes.  Too bad the ignition is not electronic.  Retard for high manifold
pressures, then advance for part throttle cruise ops.

 Brian Michalk  <http://www.michalk.com>
Life is what you make of it ... never wish you had done something.
Aviator, experimental aircraft builder, motorcyclist, SCUBA diver
musician, home-brewer, entrepreneur and barely single


> -----Original Message-----
> From: reflector-admin@tvbf.org [mailto:reflector-admin@tvbf.org]On
> Behalf Of Ronnie Brown
> Sent: Thursday, April 22, 2004 6:14 AM
> To: reflector@tvbf.org
> Subject: REFLECTOR:Timing Change for Lycoming IO 360 C Engines?
>
>
> A discussion on the RV list says that Lycoming issued S.B. 380A "IO-360-C
> Timing Change"  - requiring a change from 25 degrees to 20 degrees BTDC.
> Any body got the contents of this bulletin or know what the reasoning is?
>
> THANKS
> Ronnie Brown
>
>
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