Convert Cherokee 140 to 180?

In article ,
Aaron Coolidge wrote:

Real world figures with 36 year old airframes (the Cherokees all have METCO
wing tips, the Archer doesn't):
My Cherokee 180, no speed mods, Piper wheel pants, trues out at 141 MPH
at 70 ish % power.
The 160 HP Cherokee 140, no speed mods, Piper wheel pants, trues out at
117 MPH at 70 ish %. It has the AMRD prop tip mod.
The 150 HP Cherokee 140, no speed mods or wheel pants, trues out at
109 MPH at 70 ish %.
An Archer 2 (Old style wheel pants) owned by my friend (we fly in formation)
uses 50 less RPM to get the same TAS as I do.

I don't have speed mods, but do have those metcoair tips (or whatever the name
is)

Before I converted my 140 to 160hp, it could cruise at about 105 KTAS at
~4000' and 75% (with wheel pants) but I would usually plan on 100 KTAS.

After converting to 160hp (and repitching the prop to a cruise prop) it'll
do 110+ KTAS down low at 75% (without wheel pants).


Climb:
With 1 or 2 people and full fuel I rarely see less than 800 FPM initial
climb in my airplane. I usually see more like 1200 FPM. With the cold
weather, of course, climb performance is even better. In the summer at
gross wt (2400 lbs) I'll see at least 500 FPM.
The 150 HP Cherokee rarely makes 700 FPM, even in the winter. 500 FPM
in the summer is also unusual. (This plane has a tired engine, though.)
The 160 HP Cherokee is a solid 500+ FPM climb in the summer, 2 people and
36 gals of fuel. I haven't flown it in the dead of winter.

before conversion: my 140 did not climb well, except in the winter. :-)
However, unlike the 150hp 140 example above, mine would regularly
climb at 1000fpm in the winter (initially).

after conversion (even with the cruise prop), it's much stronger in climb.
Easily 1000+ fpm climb even when pushing the nose over for cooling.
In fact, I now have to worry about climbing into the KBOS Class B airspace
when departing KBED to the west. I never had to worry had to worry about
that before.

--
Bob Noel
looking for a sig the lawyers will like