1953 Pa-22-135/150

[7436]

N#:3446A
Type A/C: PA-22-150
Engine: HP: 150 narrow deck chrome cylinders
Propeller: Sesenich 74DM60
Wheelpants: None
Wing Tip Mods: None
Any other mods that are pertinent: None
Altitude: (Remember 7,000 feet MSL would be optimum, several altitudes
desireable) 6500
OAT at flight level: 75 degrees F.
Altimeter setting: (needed to accurately calculate Density Altitude) 29.92
RPM Mech. Tach: 2450
Digital Tach:
Ground Speed by GPS or Loran, 10 mile course: 123 mph Average GPS
Track out: 127 mph
Track Back: 119 mph
Comments: I run engine 2450 full throttle, rich of peak lean; 250 hours SMOH to new specs; "cruise" prop Sesenich 74DM60; full tanks, 240 pilot, 25 lbs in baggage. Too many antennaes! Needs Wax.

Thanks for your support

[Bruce]

did you install a 150 in place of a 135?

[7436]

Yes,

The conversion was very straightforward by the STC. Airplane gained about 40 pounds; used all the same accessories and prop; repitched prop to 58-60; oil-breather overboard tube had to be rerouted slightly; put on new carb; rebuilt baffling to match cylinders. I've been very happy with the extra power and more modern engine. I was not happy with the cost. I probably spent $15-16k on getting everything in order (which included buying a useless "core"). I really got burnt on an 0-320 from an Apache; turned out to have been in a serious wreck in Alaska which was not noted on the logs. Crank had to be replaced; case had to be replaced; cylinders were garbage---my fault for being stupid.

[12944]

Been there too, have to watch out for that. I buy engines and then overhaul them and sell them or put them in a project. I have got burnt on some of my early projects also. It can be risky sometimes, but I feel your pain. I agree with the extra power, I would not own one w/o a 150hp minimum, but I like putting my 180hp engines in even better.

[Leo Bachman]

What did you do about the wings regarding the 12 rib on the 135H.P. and the 13 rib required for the 150 H.P. ?

[Gilbert Pierce]

The number of ribs determines V speeds limits. Replacing a 135 or even 108 hp can be done. The VNE, VNO and Va speeds just remain the same.
I replaced a 108hp engine with a 150 hp engine on my Clipper. Same V speeds for 108 Clipper but got a 150 lb. gross wt. increase based on the increased hp.

[7436]

The STC from 135 to 150 does not *permit an increase in gross weight; placard speeds remain the same. No change was required; I just resist the temptation to overload the plane and fly within the factory authorized specifications.

* (I'll recheck the gross-weight issue. I don't think I was elgible for an increase.)

[Tom T.]

You can increase the gross weight but it all depends on what the serial numbers are. If you check out the tcds you will see what I am referring to. My 1951 did not fall within the required serial numbers.