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Franklin / PZL Model 4A-235-B31
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The Franklin / PZL 4A-235-B3 aircraft engine was developed to be a higher power replacement for the Continental A-65 through 0-200 engine line. As a result, the Franklin engine will fit directly to an 0-200 engine mount, the exhaust system and carburetor mounts in nearly the same location and the cowling will usually still fit. The 4A-235 weighs within a few pounds of an 0-200 when the engine are comparably equipped, yet it is rated at 125 HP.
Download this engines dimensions. |
Engine Specifications
General: |
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| Model |
4A-235-B31 |
| FAA Type Certificate No |
E6EA |
| Rated Horsepower |
125 / 116 @ 2800RPM * |
| Number of Cylinders |
4 |
| Displacement |
235 Cu. inches |
| Bore |
4.625 Inches |
| Stroke |
3.5 Inches |
| Engine Weight (Dry - Without Accessories) |
206 lbs. |
| TBO |
1500 Hours |
| Ignition: |
|
Magnetos, Slick |
Model 4392 |
| Magnetos, Bendix |
S4RN - 20 / 21 |
| Ignition Timing, BTC, Both Magnetos |
32 degrees |
| Firing Order |
1, 4, 2, 3 |
| Spark Plugs |
18mm |
| Fuel System: |
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| Carburetor: Marvel Schebler |
MA-3SPA |
| Fuel - Minimum Octane - Aviation |
100/130 |
| Lubrication: |
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| Wet Slump - Oil Capacity |
6.6 Qts. |
| Oil Grade, Above 41 Degrees Ambient Air |
SAE 40 |
| Oil Grade, Below 41 Degrees Ambient Air |
SAE 20 |
| Valve Clearance: |
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Valve Rocker Clearance With Lifters Bled Down And Engine Cold |
0.0360 - 0.044 inch |
| Operating Limits: |
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| RPM - Maximum Limit |
2800 |
| RPM Idle |
750-950 |
| Cylinder Head Temp (Bayonet Thermocouple) |
392F |
| Oil Temperature - Maximum Inlet |
234F |
| Oil Pressure - Operating Range |
50-80 PSI |
| Oil Pressure - Idle |
25 PSI |
| Fuel Pressure (Carb. Inlet) |
2.2 - 7.3 PSI |
* - 125 HP SAE, 116 HP Metric
Check out these benefits of the 125 hp Franklin engine !
FAA Certified - Factory New
Direct Drive - no gear reduction box
Smooth running - low rpm power
Unmatched horsepower / torque ratio
Most Economical engine in its class
Built-in crankshaft torsion damper
Proven Reliability
254 lb-ft torque at 2800 rpm!
RELIABILITY:
These are NEW FAA-certified aircraft engines, not a rebuild of a high time engine that has been subjected to years of unknown treatment. Because these engines are used in helicopters (6-cylinder model), where they are turned at 3200 RPM, they are under stressed in fixed-wing aircraft where they are operated at 2800 RPM.
SENSIBLE ENGINEERING:
The cylinders, bearings, valves, lifters, connecting rods, etc., are common throughout the engine line production, reducing cost and parts inventory problems. The cylinders have removable sleeves (cost only about $80 each!) that are field replaceable, the camshaft is on the bottom of the engine, and the oil pump is in the sump, so there is less chance of losing its prime and the resulting dry starts, especially in cold weather. There is a removable top cover on the crankcase so that the inside of the engine can be easily inspected. The exhaust ports have insulating sleeves to reduce cooling requirements and simplify installation of exhaust manifolds. Further, the engine can be easily adapted for inverted oil systems.
SMOOTHNESS:
All Franklin / PZL engines have built in fluid damper on the crankshaft which makes then the smoothest aircraft engines of their size.
Copyright © 1998-2025 Franklin Aircraft Engines All rights reserved.
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