MONTY THE ANSWER
MAN ARCHIVE
Swift
Continental C125/C145/O-300 Information
O-300 ENGINES CHOICES...
From: Dennis Mee (jmmee@nh.ultranet.com)
Subject: Re: N3812K
I just came across an O300D I can get everything I need to make it work
except for a prop I guess that could be a problem without changing the
crank. I really don't need a vacuum pump since this will be a VFR restoration
so I'll keep looking. Thanks, Dennis Mee
Dennis,
I have an O-300A with a B&C starter. It is 10 or more pounds lighter
than the O-300D I removed. I like the O-300D engine, the case is a little
"heavier" than the "heavy" case 125 & C-145, and the cam is better.
The cylinders are better too - but that point may be moot because for
a good overhaul these days you just buy new cylinders. They are about
$600 ea., and a first class cylinder overhaul costs almost that much,
so you might as well buy new ones. That push button starter is really
nice! (with either the O300D or the B&C starter) Keep in touch. --
Jim
O-300 ENGINE QUESTION...
(3699)
From: Ed Lloyd (edlloydaustin@juno.com)
Subject: Re: 0-300A
Howdy Jim,
Feel like I know you what with all the questions and answers I've read
on the net. The question I have concerns the 0 300A engine. What are it's
good points and what are the bad? I'm looking for a Swift and have two
located, both with this engine. One has 337 hrs and the other has 915
SMOH. I would value your input . Regards -- EdLloyd
Ed:
I like the O-300A, its the approved engine on the STC. I removed a "D"
and installed an "A" with a B&C starter. The bad things are the cylinders
are marginal for cooling and the lack of a controllable prop. I like one-piece
props! (cheaper, and won't throw a blade and kill you!) I can live with
the takeoff performance. My temps. are usually pretty good, my baffling
is in good shape. I have the new TCM cylinders and am keeping my fingers
crossed, there is a service bulletin out on them. I think the O-300A is
the most cost-effective engine for a Swift. -- Jim
O-300D QUESTION...
(4199)
From: Ed Lloyd <edlloydaustin@juno.com>
Subject: 0- 300D
Jim
Tell me what I need to know about the 0-300D. What are the good features
and what are the bad? I know it has a vacuum pump capability. Does it
have any other features that make it better or worse in your opinion,
than the 0-300 A? Regards, Ed Lloyd
Ed,
The O-300D is not STC'ed for the Swift, most are intalled on the O-300A
STC with a field approval for the prop. The "D" and "C" have a different
crankshaft flange. The best prop is a Sensenich 74DC-1-60. Some 172's
used this prop, with a lesser pitch. Most are found on Beech Muskateers.
Others have used the McCauley EM series prop, but it is not as good a
performer. The vacuum pump is a nice feature as is the key start. --
Jim
ENGINE STC QUESTION...
(8599)
From: Greg Papendick <pappy@shianet.org>
Subject: Swift STC
Well it looks like I finally know what I am going to do with my Swift
engine problem. I wrote to you some time back about my problems with getting
my 0-320 installation approved and about the new AD on the prop. I have
found a FWF 0-300 for sale and I guess I will be using that (includes
metal cowl). My Swift is pretty close to original except for the FWF,
battery relocation, and one piece windshield. This would allow me to return
the Swift to pretty much original someday. My question for you, do you
know anything about the 3 different STC's available for the 0-300A? It
seems to me that I read somewhere that at least one of these has a RPM
limit to keep the horsepower to 125. I would like to make this installation
as simple as possible. Regards -- Greg Papendick N3252K
Greg,
The best (and cheapest, $25.00) STC for the 0-300A installation is the
Swift Assn. (Piedmont) STC. It does require a placard to limit the engine
to 125 hp, but so what? 125 hp is 86% power for a 145 hp engine and the
only way you can exceed that is at sea level with a climb prop. With the
prop called for on the STC, a 73x59 McCauley, you can't pull over 125
hp. They addressed the 125 hp restriction in kind of a dumb way. For legal
reasons, you need a placard "do not exceed 2270 rpm at any time". They
left off "at full throttle". I have mine above the rt. windshield, instantly
viewable, but if you aren't looking for it, you would never notice it.
If you don't mind spending the money, Merlyn has a GW increase for a 145
that allows full power and allows several different props, McCauley and
Sensenich, both lower pitched which give better takeoff performance. --
Jim
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