The Murphy Builders Site

Lycoming published a 46 page list of certified aircraft engines SSP-204.
Mine is dated Feb 2004.
It is a free hand out at shows that they attend along with free technical
advice.

The first 28 pages covers all engines that they build. To use this section
find the model you are interested in; this will give you Model, HP, RPM,
Fuel type, Compression Ratio, then Discretion. Under description it tells
you; Same as, or similar to BUT ---- Follow the heritage back through the
book to each model referred to & gives you your specific engine differences,
in many cases it will reference you back to the first basic engine in that
size series such as to -A1A. In all of this data you will probably find
the type of mount. Also information on the type of Magnetos, crankshaft
counterweights, Carb / Injection, Governor, ETC.

The back half of the book lists engine models and which airplanes they were
made for such as; Aero Commander, Piper, Cessna & a whole bunch more.

To get more specific information on your engine of choice go to the FAA
published TYPE CERTIFICATE DATA SHEETS or (TC's). This is required library
information for the A/P with Inspection Authorization, so if you have a A/P
friend maybe you can look their.

Dick Wampach SR-108 N331RW



-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] On Behalf Of
bransom@dcsol.com
Sent: Monday, December 20, 2010 10:18 PM
To: rebel-builders@dcsol.com
Subject: Re: [rebel-builders] Conical engine mount


Thanks Keith for the clarifications. I'd mostly been thinking about getting
a
conical mount engine and so had somewhat forgotton about the two types of
dynafocal. (Walter and Wayne's recent comments somewhat strengthen my
interest in hoping for a deal on a conical.) Anyway, I've widened my search

recently to the wide deck/dynafocals, so glad for the reminder on angles. I

still can't tell though if it was only the IO B1A engines that used Type 2,
18*.

Found another helpful post on this after digging around a little last night:
http://www.biplaneforum.com/printer_fri ... p?TID=3758 (near the
bottom)
-Ben/ 496R

On 12/19/2010 9:22 PM, kpierson wrote to bransom:

Ben: The 18* & 30* mounts are not interchangeable, and it is not
Cessna versus Piper. Piper used the Lyc. I0320 B1A with the 18* mount
on the twin Comanche, but also uses various other Lyc. engines with
30* mounts, where as Cessna uses Lyc. engines with the 30* mount. The
18* mount is an early version of the dynafocal mount. What Lycoming
did was to use a conical type engine block, but instead of drilling
the mounting holes streight they drilled them at a 18* angle with a
depression in in the ears that require an special aluminum washer and
also the motor mount must be welded up at 18*. The 30* mount block is
cast with more material so the ears can be machined at a 30* angle,
and that mount must be welded up at
30*

Keith P. Taildraggers forever

On 12/19/2010 7:35 PM, bransom wrote to rebel-builders:

-> Sticking with the subject, altho my question is wrt the dynafocal

mount...

->
-> Doesn't it matter which engine, as to the 18 or 30 degree mount?
-> It
seems
-> odd that it hinges on Piper versus Cessna when, after all, it is
-> the front

of

the
-> mount (that ties to the engine). Or, is it just that some angle in
-> works,
and
-> the Lord bushings take care of 18 versus 30?
->
-> Thanks,
-> -Ben

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