C85 Engine up grade on n26658

[barnstmr]

Re: C85 Engine up grade on n26658

Chuck,
sounds good. Just curious... do you always fly in cruise at full throttle? Or are you doing this to break in the engine and check cooling? How many hours do you have on the engine now? If you are still breaking in the rings, the CHTs should come down some after they wear in better. This will also have a very small effect to bring down oil temp a little too. In FAA testing, the cooling test requirement calls for a full throttle climb at gross weight after temps stabilize for 5 minutes and then correct the temperatures to a 100`F hot day conditions. To do that you need to record your altitude and OAT. Try that sometime and send me the numbers, I will do the hot-day correction and let you know what kind of REAL temperature margin you have using the FAA method.

[cvavon]

Re: C85 Engine up grade on n26658

Terry 6hr total time now still braking it in and well i always run a engine full throttle for brake in the rpms are coming up it now will turn 2500 so the prop is close to right pitch so far no oil consumption to speak of the temps are stable and a 107 kt ground speed is grate will try the climb test and collect the data and let you know. the baffles seem to be working well I will keep on posting numbers Chuck

[cvavon]

Re: C85 Engine up grade on n26658

The engine is doing fine no oil use starts good hot or cold and makes horse power almost a year old .

[cvavon]

Re: C85 Engine up grade on n26658

Well it's been a year and finished the dreaded annual inspection yesterday,ALL WAS WELL air plane was in grate shape the engine had compressions two at 79 one at 78 and a 77 cold.AI asked if i had cleaned the engine. Told him no it does not leak much so far. Good for the next year.

[Pearson]

Re: C85 Engine up grade on n26658

Hey Chuck,

How many hours did you put on it in the last year. Those compressions are really good. Are those cylinders chrome or steel?

[cvavon]

Re: C85 Engine up grade on n26658

Well we flew 20 hr this annual after all the work was short of gas money better this year i hope. The cylinders are ECI steel and was very happy with them,put new prop on it's a sensenich 76-ak-4 witch comes out 72/40 pitch 2400 RPM static i think it will do just what i want it to do let the engine turn and make horse power

[ifdale]

Re: C85 Engine up grade on n26658

Never heard of the 76ak-4, it's a true 72" prop?

[cvavon]

Re: C85 Engine up grade on n26658

here is a photo of the hub on the sensenich prop

[Edwin Otha]

Re: C85 Engine up grade on n26658

Sometimes the repair facility will modify the prop markings. Sensenich has a memo on this practice.

http://www.sensenich.com/files/documents/Repairs_Trouble_Shooting_Hub_Stamping_on_Spacer_Removal_1297536121.pdf

EO

[Marv]

Re: C85 Engine up grade on n26658

It was probably a damaged 76 inch prop and cut down to 72 from what i see. Marv

[3Dreaming]

Re: C85 Engine up grade on n26658

It was probably a damaged 76 inch prop and cut down to 72 from what i see. Marv

Maybe, but it could have come from Sensenich like that. To get the 72" prop they start with a 76" prop blank. That way they don't have to have so many different blanks.

[Edwin Otha]

Re: C85 Engine up grade on n26658

It could have come from Sensenich,but I've never run across a factory new prop that was shortened 4 inches from full length. Most are shortened 2 inches from full length. I think Sensenich would probably build any thing you want.
I posted the link to show that strange things happen once the prop is in use.
EO

[cvavon]

Re: C85 Engine up grade on n26658

I bought this prop off barn stormers no history other then it was off a j3 cub with a C85 and the cub owner wanted a cruse prop and did some trading with the person i bought it from. The prop is the right length for a tcraft with a C85 as per type cert and is in very good shape. Also Sensenich did build a 76AK-4 from the factory.

[cvavon]

Re: C85 Engine up grade on n26658

Well got to fly the plane with the new prop today. Take off full throttle 100 ft roll and was flying engine turning 2450 rpms climb 1400 ft per min at 60 mph.level flight 2600rpm 112 mph indicated. Very happy with it will fly it and see what it does on cross country.

[Edwin Otha]

Re: C85 Engine up grade on n26658

Sounds like the perfect prop for your application
EO