Upgrading a 252 to the Encore's engine

[Parker_Woodruff]

Hi Chris,

I know Don Maxwell has the drawings.

[ChrisShopperly]

Parker:

Thanks - I know Don and I've sent him a query about this.

Regards;

Chris

[bcwiseguy]

Does anyone have knowledge on what the cost would be to have the Encore upgrade done? I saw Parker_Woodruff's response that it could be between $6,000 - $8,000 but I did not see a final response on what it actually turned out to be.

[gsxrpilot]

There are a few on here including @kortopates who have gone through the process. I'm about 40% of the way through so maybe should go sit down and be quiet. 

But it appears the price of this conversion is variable depending on the availability of the parts. There are two halves to the conversion. An airframe half and an engine half.

The Airframe piece is mostly about brakes. The brakes have to be upgraded to two puck calipers which requires new disks, new gear doors (2 per wing) and some spacers. It also includes new counter weights on the control surfaces.

The Engine piece is changes to the prop governor (2600 max rpm) and wastegate/turbo (39" up from 36" boost). This also means a fuel pump change, and re-labling engine instruments and ASI.

So where you get the parts and who does the work has a huge impact on the cost. I'm guessing $8000 on the low end and $15,000 on the high end. But that's still a guess based on the fact that I have about 50% of the required parts in a box in my hangar. I've been collecting them as I can find them at reasonable prices. When all the parts are in hand, we (SWTA) will do the conversion.

[carusoam]

Paul's skills for hardware collection and installation are epic!

I’m glad you share the details, Paul.

Best regards,

-a-

[Rumblestrip]

On 1/22/2018 at 4:00 PM, carusoam said:

Paul's skills for hardware collection and installation are epic!

I’m glad you share the details, Paul.

Best regards,

-a-

Gets me thinking that finding out what Paul's favorite bourbon is and sending him a bottle every six months so one can go raid his stash at some point in the future. 

[Will.iam]

I noticed in the service manual this section below. It states serial numbers 25-2000 thorough 25-2012, 13 252 aircraft are available for encore upgrade. Does that mean all the other 252 aircraft (218) in 25-1000 to 25-1999 are not eligible? I thought all 252 were able to upgrade to encore am I wrong on this assumption?

 

Aircraft S/N 25-1000 thru 25-1999 have a TCM TSIO-360-MB, 210 HP engine installed. This installation utilizes an Airesearch variable wastegate
turbocharger and a tuned induction system. Sea level
power can be maintained up to 23,000 feet density
altitude with a certified ceiling of 28,000 feet.
Production aircraft, S/N 25-2000 thru 25-2012 have a
CM TSIO-360-MB7.
210 HP engine installed. This
installation is basically the same as the -MB installation.
TCM standardized their P/N callout for engines with dual
altemators. Retrofit to -SB configuration (see below) is
possible at owners discretion.
Aircraft S/N 25-2013 thru
25-TBA have a
TCM TSIO-360-SB, 220 HP engine installed. This engine
configuration increases Manifold Pressure from 36 In. Hq.
to 39 In. Hg, and reduces RPM from 2700 RPM to 2600
RPM. Sea level power can be maintained up to 20,000
feet density altitude with a certified ceiling of 25,000 ft.

[LANCECASPER]

50 minutes ago, Will.iam said:

I noticed in the service manual this section below. It states serial numbers 25-2000 thorough 25-2012, 13 252 aircraft are available for encore upgrade. Does that mean all the other 252 aircraft (218) in 25-1000 to 25-1999 are not eligible? I thought all 252 were able to upgrade to encore am I wrong on this assumption?

 

Aircraft S/N 25-1000 thru 25-1999 have a TCM TSIO-360-MB, 210 HP engine installed. This installation utilizes an Airesearch variable wastegate
turbocharger and a tuned induction system. Sea level
power can be maintained up to 23,000 feet density
altitude with a certified ceiling of 28,000 feet.
Production aircraft, S/N 25-2000 thru 25-2012 have a
CM TSIO-360-MB7.
210 HP engine installed. This
installation is basically the same as the -MB installation.
TCM standardized their P/N callout for engines with dual
altemators. Retrofit to -SB configuration (see below) is
possible at owners discretion.
Aircraft S/N 25-2013 thru
25-TBA have a
TCM TSIO-360-SB, 220 HP engine installed. This engine
configuration increases Manifold Pressure from 36 In. Hq.
to 39 In. Hg, and reduces RPM from 2700 RPM to 2600
RPM. Sea level power can be maintained up to 20,000
feet density altitude with a certified ceiling of 25,000 ft.

25-2000 to 25-2012 were made in 1997 and pretty much had all of the parts already (dual puck brakes, gear doors, etc, etc). On paper they were 252s before the FAA blessed the Encore changes. Then they each got the Encore gross weight increase entered in the logbook (see below). I used to own 25-2012.

(https://www.mooney.com/wp-content/uploads/2020/12/Retrofit-Kits.pdf) Early 252s can get the upgrade also, kit 940101-503 was made available from Mooney, but I think now all of the parts must be sourced on your own. 

[Aerodon]

That might be correct for a 25-20XX serial number, but for a 25-1XXX conversion you need to change the lower gear legs, brakes, gear doors, master cylinders (& bell cranks too).

 

Aerodon

[Will.iam]

I wonder now that the mooney factory is doing annuals if doing the encore conversion would also be an option there as they should have all the parts and knowledge to do so. 

[Parker_Woodruff]

47 minutes ago, Will.iam said:

I wonder now that the mooney factory is doing annuals if doing the encore conversion would also be an option there as they should have all the parts and knowledge to do so. 

It's a marketable revenue stream and not that difficult to accomplish.

[Will.iam]

16 minutes ago, mike261 said:

I have collected most of the parts for this over the past two years. i still need the brake calipers, pads and rotors. I'm at somewhere around 11K, and last i looked the brakes were in the 4K range...that puts me at 15K before the labor and engine changes. Figure 25 to 30K to do this. I also have the drawings if anyone wants them.

Mike

I’d like to have a copy of the drawings. I think this is honestly the only mod that will pay for itself since there were so few encores made. Curious if you haven’t bought the brakes and already spent 11k, what was that on? New landing gear? 

[carusoam]

11 hours ago, mike261 said:

aileron weights, empennage weights, four new gear skins, bellcranks, master cylinders, some adapters for the gear, something else escapes me.

RETROFIT - DUAL CYL BRAKES - DWG 940067_A-1.pdf 47.48 kB · 11 downloads RETROFIT - DUAL CYL BRAKES - DWG 940067_A.pdf 438.77 kB · 7 downloads RETROFIT, TSIO-360-SB ENGINE DWG. NO. 940141.pdf 320.92 kB · 7 downloads RETROFIT TSIO-360-SB ENGINE DWG. NO. 940141.pdf 321.51 kB · 8 downloads

Mike,

This is a collection of awesome detail…

See if you can upload it to the documents area for safe keeping and ease of reference… by other people…

This way people looking for it can find it without struggling with a search function and wondering if it is even here…

Best regards,

-a-