corefile wrote:My pponk/XP470 is going in now - reading through the docs provided from the STC and operation instruction - it says not to run it LOP. I know there are a lot of debate around LOP vs ROP. Any of you pponkers running yours lean of peak?

180Marty wrote:Flew my XP470 for an hour today since it was so nice-----60 degrees and smooth air so I could run it hard. Looks like about at the yellow for airspeed at 24 square. I had the cowl flaps closed not to long after taking off and temps seemed good. Oil pressure was just above the white line which is 50 so like that better that top of the green like before. Other than a little oil weeping from the crankshaft seal it seems like all is well. Did realize that big balance tube wasn't going to fit before too far along and put the little one from the 470U on. I had Central Cylinder reuse the bearings, cam and followers since they were still in good shape from the overhaul 11 years ago. They are able to machine the crankcase for the 520's since I started with a 470K. Sure like the 100 watt Reiff preheat on the cylinders and one pad on the oil pan(will add the second when motivated). Guess the white spinner doesn't look too bad.

PNW Flyer wrote:Back to operations, does anyone have a MP, RPM, fuel flow, %BHP chart for a -50? I realize this is a little bit prop dependent. Mine is Hartzell F8068 82”.

Halestorm wrote:

Scolopax wrote:

mtv wrote:Kenmore Air used to have a 520 conversion for the 180, which they used on all their 180s. I’m not sure what that conversion is all about, but a phone call can answer that question. At one point, I researched it and I THINK it was a converted 520.

MTV

They have one STC that converts an O-470 to a 520, but I believe that it only applies to the O-470U, which is a slightly different animal than most of the other 470s.

No.

The Kenmore STC uses a converted IO-520D. I installed them when I was a line mechanic at Kenmore.


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AAlexander wrote:

Halestorm wrote:

Scolopax wrote:

mtv wrote:Kenmore Air used to have a 520 conversion for the 180, which they used on all their 180s. I’m not sure what that conversion is all about, but a phone call can answer that question. At one point, I researched it and I THINK it was a converted 520.

MTV

They have one STC that converts an O-470 to a 520, but I believe that it only applies to the O-470U, which is a slightly different animal than most of the other 470s.

No.

The Kenmore STC uses a converted IO-520D. I installed them when I was a line mechanic at Kenmore.


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"No" eh? Odd, because Kenmore holds STC SE2107NM for the conversion of an O-470-U to a 520 cubic inch displacement engine, and STC SA2069MN for installing that converted engine in Cessna 180's. (As well as other carburated O-520 engines converted from IO-520 engines under STC2068NM) I guess being a line mechanic doesn't make one particularly knowledgeable about the STC's a company holds.

AAlexander wrote:"No" eh? Odd, because Kenmore holds STC SE2107NM for the conversion of an O-470-U to a 520 cubic inch displacement engine, and STC SA2069MN for installing that converted engine in Cessna 180's. (As well as other carburated O-520 engines converted from IO-520 engines under STC2068NM) I guess being a line mechanic doesn't make one particularly knowledgeable about the STC's a company holds.