Lycoming O-320E3D McCauley Prop Vibration...

[Guest]

I have recently been flying a different Airplane (Piper PA-28-150). We noticed that it has a substantial Vibration when advancing the throttle form Idle up through about 1100 RPM. We have checked Prop Tracking and Blade angles. Has anyone ever had this problem with the higher Horse power Engines? My 172 has the O-320 E2B, and does not show this tendency. I was just curious if this might be a trait of Piper Cherokees. Any opionions are appreciated.
Thanks, Champdriver.

[joea]

I seem to remember this from flying the old Pipers years ago. Wonder if its a vibration from the engine in this RPM range?

[Nathan K. Hammond]

Most Cherokees do it. It seems to be a harmonic vibration like Joe said.
The door on my Champ will vibrate at around 1400 rpm because of the slop on the latch.

nkh

[MikeB]

I had a Cherokee 140 (150 horse) that I owned for 25 years and just sold it last year. I don't remember any vibration at the bottom end, but it did tend to have somewhat of a harmonic vibration at 2300 RPM. So I always ran it near 2400 where it was smooth. The other thing I noticed about it was it hated carb heat. Especially in warm weather it would drop big time and no, there wasn't any exhaust leaks to the carb heat system either. I tore the whole thing apart looking for one. Finally decided that's the way it was going to operate and lived with it.

Nathan.................looked for you at Oshkosh (the guy with the baseball cap).

Mike Berg

[joea]

Mike,

You have to look up to find Nathan... he is a pretty "healthy" (meaning real big) guy!

[Nathan K. Hammond]

I was around, but not for long. You wouldn't have noticed me, the hat said CubCrafters. Plus I ended up having to work on the plane all day sunday and monday in the Weeks hangar to get it airshow-worthy. I got 5 hours on tuesday morning before my silver tube headed south. Really bummed me out, I was hopeing to get over to the NAA tent but didn't. Did get to meet Jerry Jr. though.

nkh

[Captgrumps]

Nathan

What airplane did you work on? An Aeronca? C-3?, K? or some off brand?

Doug

[Nathan K. Hammond]

A piece of Canadian Bacon made by someone named Dehavilland.

nkh

[joea]

A piece of Canadian Bacon made by someone named Dehavilland.

nkh

By making this quote, I assume that you have seen the movie?

[Nathan K. Hammond]

Ummm, don't think so. You'll have to refresh my memory.
Did I just step in a big steaming pile?

nkh

[joea]

Nope. There is a very funny movie called "Canadian Bacon" and if you are ever going to head up to the GWN (Great White North, aka Canada) you really have to see it.

[Ron Babos]

Nathan: Hmm, you realize our bacon is as good as our beer
Ron

[Nathan K. Hammond]

Would that be the 4 legged or 2 legged version? Doesn't matter, I'll take one of each!

nkh

Thats the movie where they declare war on Canada right? I'll have to go get it this weekend, too combat this heat-wave.

[Ron Babos]

[quote="Nathan K. Hammond"]Would that be the 4 legged or 2 legged version? Doesn't matter, I'll take one of each!

nkh

Nathan: I would not recommend either, as one will raise cholesteral and the other will drop protein levels
Ron

[Lowell Sterchi]

Check for proper propeller Indexing to the engine....some A/C are very
critical in this area, just one bolt hole can make a world of difference.