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The designers of the Ercoupe
seemed to think a controllable-pitch prop was a viable option, since the
dash-1's from the earliest time list specs for it.
I've heard that the
controllable-pitch option added too much weight to justify its improvement over
fixed pitch. Do you feel this is true?
Or is it an expense issue and
simply not worth the money for the performance gained?
Have the people on the Forum had
great experience with these? Sure would like to hear about it; I've never
laid eyes on one.
R. Beeman
----- Original Message -----
Sent: Monday, April 11, 2005 5:08
PM
Subject: Re: [COUPERS-TECH] O-200
conversion
----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]----
At 11:30 AM 4/11/2005, you wrote:
Ive been
considering changing my C-85 crankshaft to an O-200 crankshaft and am
wondering if anyone has done that and retained the Stromberg carb.
Norm, et. al.
Installation of an "O200
crankshaft" in a C85 has no bearing on the carburetor. You need to
install the pistons and rods from an O200 as well, as all the parts have to
play together. When you're done you still have a C85 with a C85
carb.
Folks always seem to read a lot more into this modification than
is really there. Calling it the "O-200 conversion" adds to the
confusion. Look at it this way: Your C85 needs a new
crankshaft. You buy this crankshaft that is different from the one it
originally came with. In order to fit this different crank, you also
need to buy some other parts that go with it to make up for the
difference. When it's all said and done, you still have a C85, with a
few newer style parts inside.
BTW, most conversions require the case to
be machined to fit the later style oil slinger ring. the clearance
between the rods and the C85 cam is very tight, too, so be sure you have
someone who knows what they are doing doing the doing.
That said, the
conversion does increase the displacement and compression. Due to the
dynamics of the fixed pitch prop world, you still really have an 85
horsepower engine, but you have more of that 85 hp available under more
circumstances.
John Cooper
Skyport Services
PO
Box 249
4996 Delaware Tnpk
Rensselaerville, NY 12147
518
797-3064 ==============================================================================
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