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1981 Mooney M20K 231/252 Firewall Forward

Published by runwayalliance on March 10, 2019March 10, 2019

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by Dave Mathieson
$105,900
Category
Sold
Location
KOBI
General Info
Make: Mooney Registration Number: N300FW
Model: M20K (252) Serial Number: 25-0520
Model Year: 1981 Engine: TSI0-360-MB1 (210 HP)
Location: Woodbine, NJ (KOBI) Gear: Retractable (electric)
  Prop: Constant Speed
Summary Info
Upgraded 231 to firewall forward 252 with MB1 engine, intercooler, turbocharger, wastgate, and cowl; Garmin 530W, King KFC200 Flight Director;  3-blade scimitar hot prop, one-piece belly; recently restripped/resealed fuel tanks by Wet Wingologists.
Logbook Time
Total Time: (Hours since New)      3000 Log books
 Complete
Engine: (Since Factory 0-Time)
               (Since top overhaul 
     390
       40 
Prop:  (Since Overhaul )       40 hrs
Maintenance Info
Annual Due: (Date) Oct 2019
IFR Certification Due: Now
AD’s complete?
Yes
Hangared: Yes
Other: Fuel tanks stripped/resealed by Wet Wingologists in 2017
Engine:  Installed Factory Zero-Time in Mar. 2000; received top overhaul  Oct. 2016
Prop:  Overhauled  Oct 2016

 

Features
Standard Features Added Features
Factory Oxygen TSIO 360-MB1 engine, intercooler, turbocharger, and wastegate
Electric cowl flaps 3-blade scimitar hot prop
Speed Brakes 252 Cowl
Overlapping nose gear doors One-piece belly
Stand-by vacuum system

 

Avionics
Make / Model
Nav/Com/GPS 1 Garmin GNS 530W
Com 2 King KY197
Nav 2 King KN53
Autopilot: King KFC200 Flight Director
HSI: King KCS-55A
Transponder: King KT76A
Audio Panel: Garmin GMA 345
Engine Monitor: JPI
Fuel Flow: Hoskins FT101
Other: Electronic Tachometer
Exterior
Color(s): White w/ Black & Gold trim
Paint Condition:
(1 to 10, 10 being the highest)
5
Interior
Color(s): Tan
Fabric: Leather
Condition:
(1 to 10, 10 being the highest)
5
Glass: Good
Performance
Cruise Speed: (at 75% power) 185 kts *
Useful Load: (remaining after full fuel) 450 lbs *
Fuel Capacity: 75 gal
Fuel burn: (average) 13 GPH *
Range: 900 nm *
Specific Range: ((Efficiency = Cruise Speed ÷ Lbs per hour of fuel burn) (The higher the number, the better the efficiency)) 2.37
*Note: Performance figures are estimates based on best available information (from POH, Vref, etc.) and may not be exact for this particular aircraft.
Comments
Mooney drivers share a unique and deeply seated characteristic – they like to go fast!  Mooneys are among the most efficient and structurally sound airplanes manufactured.  The low profile cross-section and laminar flow wings reduce drag to enable the fast air speeds typically unachievable in other manufacturers’ airplanes with similar horsepower.  The tubular steel frame, acting as a cockpit roll cage, along with the wingtip-to-wingtip wing spar make the Mooney airframe the strongest and safest among GA airplanes.

The M20K 231 was the first non-pressurized Turbo Mooney.  Introduced in 1979, the 231 (numbered for it’s top speed) was hailed as the fastest single-engine production aircraft in the world.  It was an instant success and even outsold the ever so popular Mooney 201 during the first two years of production.

For the 231, the Mooney engineers capitalized on the aerodynamic airframe improvements already added to the Mooney 201 by installing an engine with a high horsepower to weight ratio – the Teledyne Continental TSIO 360 GB. This combination of engine and airframe gave Mooney drivers the optimum blend of high altitude flying coupled with incredible speed and performance synonymous with Mooney Aircraft.  The 231 included other improvements such as the NASA air scoop placed in the dorsal for improved cabin ventilation, new wing tips for better slow-speed control and enclosed navigation and strobe lights. 

In 1984, Mooney upgraded the GB  engine with the TSIO 360 LB1B which included a redesigned fuel distribution system plus nitrited cylinders, steel belted pistons, and a new rod design that resulted in more efficient power and extended service life.

In 1985, Mooney’s engineers were tasked with making as many improvements as possible to the 231 and bringing to the market a vastly improved airplane in 1986 – the M-20K 252TSE.  Among the improvements were improved engine cooling and a redesigned primary air induction system.  Just as monumental, TCM listened to customers and made big improvements to the LB engine that resulted in the MB1 version. The changes were many.  Most important were a tuned induction system for more even induction airflow to the cylinders, a larger Garret turbocharger, a manifold pressure controlling system allowing full throttle operations for takeoff, and the incorporation of an intercooler that cooled induction air temperatures by as much as 100 degrees F.  The improvements resulted in the 252 that ran cooler than the 231, required only 36 inches of manifold pressure versus 40 with the 231, and flew 10 kts faster than the 231.

In March 2000, a factory zero-time TSIO 360 “MB1” (252) engine, turbocharger, intercooler, and wastgate were installed.  In October 2016, the engine received a complete tear-down with six new TCM cylinder assemblies, a new cam, lifters, and bearings.  At the same time, the 3-blade scimitar hot prop was overhauled.  In essence, this is a 252 – firewall forward.  It’s mechanically strong and a fast airplane!.

Contact Us About This Aircraft
Please call Dave Mathiesen at 609-259-2400
Show Contact Information

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