Lack of Power in 172-R

Lack of Power in 172-R

Hi, all,

Could someone please provide some suggestions on this.

Last summer we bought a 1997 160 HP Cessna 172-R. The test flight (with 3 adults) went just fine.

When I picked the plane up from the shop after the service (required to fix certain things that needed it [such as a loose tail!], the performance was very sluggish. It did not seem like the same plane - quite underpowered.

Even below gross weight, it couldn't take off from a 2200' runway
without scaring the heck out of me thinking we weren't going to make it. OK it was hot but the book said we should be over a 50' obstacle at about 1800' - we were not even close!

All rpm indications were within spec (for static run-up, etc). When on the takeoff roll, rpm was about 2100, which seemed low, but there is no spec in the POH for rpm for the takeoff roll. The rpm went much higher after we were cruising (2300 or so).

Also, there was a "burbling" sound from the exhaust.

The prop was removed, inspected and put back on (with pleanty of
scratch marks which weren't there before.

Any suggestions would be greatly appreciated.

TIA Chuck

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Re: Lack of Power in 172-R

Sounds like your better get that plane looked at. That is my only suggestion...

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Re: Lack of Power in 172-R

Minimum STATIC rpm is 2065 for your engine.  There will be no number published for takeoff roll.
Personally, I would not fly the plane until a thorough inspection.  Areas to look-  Muffler blockage, Inlet air hose collapse, fully closing carb heat, full travel of throttle controls, proper mag internal AND external timing, low compression, correct prop--  to name a few.

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Re: Lack of Power in 172-R

I had similar problem w/my o-320 in Grumman Traveler many years ago.  I thought the worst but I found out that my foam air filter was very very dirty and restricted airflow. After changing the filter, I was back to full power....and relieved.

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