# TCDS TC 225: Franklin Engine Company

- Type: Type certificate data sheet
- Status: Current
- Holder: Franklin Engine Company
- Revision: 0
- Product: Engine
- Registered aircraft: 6, by the registry models matched to it (OpenAirDocs)
- Data sheet PDF: https://openairdocs.org/files/sha256/c3/28/c328b3869db368f46b603e22c2c7206e80bf329d7339160131c1a5a0e4870609
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/B40E87A7944CF7218525670C0056BEE2.0001
- Page: https://openairdocs.org/tcds/TC%20225

## Models (2)

As the data sheet lists them.

- 6ACT-298
- 6AC-298

## What the data sheet says

From the PDF's text layer, line by line; tables lose their columns. The PDF is the record.

```text
FRANKLIN ENGINE COMPANY
MODELS:  Aircooled Motors 6AC-298 Series and 6ACT-298 Series
T.C. NUMBER:  T.C. 225
Model - Franklin 6AC-298-D2,
   D3
6AC-298-E2,
   E3
6AC-298-F2,
   F3
6ACT-298-J4,
  J5 (O-300-11)
6ACT-298-M4
Type 6HOA - - - - - - - - - - - - - - - -
Rating:
  Maximum continuous,
  hp, rpm, in. Hg., or
  full throttle at:
    Rated press. alt.
    S.L. press. alt.
- - - -
130-2600-F.T.-
   S.L.
- - - -
130-2450-F.T.-
   S.L.
- - - -
130-2550-F.T.-
   S.L.
90-3200-F.T.-1700
130-3200-F.T.-7500
130-3200-23.3- S.L.
or
155-2930-F.T.- S.L.
- - - -
- - - -
   Take-off, hp, rpm, in.
   Hg., or full throttle 130-2600-F.T. 130-2450-F.T. 130-2550-F.T. 130-3200-23.3
   or 155-2930-F.T.
- - - -
Fuel (minimum octane
   aviation gasoline) 73 80 - - - - 100 - - - -
Bore and stroke, in. 4.25 x 3.50 - - - - - - - - - - - - - - - -
Displacement, cu. in. 298 - - - - - - - - - - - - - - - -
Compression ratio 6.3: 1 7: 1 - - - - 8.4: 1 - - - -
Weight (dry), lbs. 260, 267 265, 272 261, 268 298, 308 290
Propeller shaft Special with
   integral
   flange 8-7.16
   in. bolt, -5
in.
   circle
- - - - - - - - - - - - - - - -
Carburetion Marvel MA-
   3A or MA-3
   carburetor
   with 1-3/8
in.
   venturi
Dual Marvel
   MA-3A
   carburetors
   with 1-3/8
in.
   venturi
Marvel MA-
   3A or MA-3
   carburetor
   with 1-3/8
in.
   venturi
Dual, Marvel MA-
   3PAA carburetors
   with 1-3/8 in.
   venturi
Dual, Marvel
   MA-3A
   carburetors
   with 1-3/8
in.
   venturi
Ignition, dual Eisemann 1A-
6
   magnetos
   with impulse
   coupling
   (retard 25
   degrees)
- - - - - - - - Scintilla SF6-RN-8
   magnetos
- - - -
Ignition, timing,
   deg. BTC
28 - - - - - - - - J4 - 30, J5 - 28 30
Oil sump capacity,
   quarts
8 - - - - - - - - 8-1/4 10
Spark plugs Champion AJ-
   66, C-10S,
   78S;
   Simmonds-
- - - - - - - - - - - - - - - -

Benton 4D3-
   S; AC SA-
   47; Auto-Lite
   A5-B or A4-
   S
Certification basis Type Certificate No. 225  (See NOTE 5)
NOTE 1.    Maximum permissible cylinder head, cylinder barrel and oil inlet temperatures, 500 degrees
F.,
   300 degrees F., and 240 degrees F., respectively, for all except the 6ACT-298-J4, J5 and M4 models
   whose limits are 480 degrees F., 300 degrees F., and 220 degrees F., respectively.
NOTE 2.    In addition to the differences shown above, the following similar engine models have
   identifying characteristics as noted:
Models
6ACT-298-M4 One generator, central zone type oil pan manifold
6ACT-298-J4 Two generators, two gallery type intake manifolds
6ACT-298-J5 (O-300-11) One large generator (with brace) two gallery type intake
   manifolds
NOTE 3.    The following accessories are eligible for use on the specified engine models at the indicated
   additional weights:
Optional Accessories Weight (lbs.)
Generator
Auto-Lite type GAS or GDY (Models - 3 only) 12
Auto-Lite type No. 11496 (Models - 4 only) 12
Auto-Lite type No. 11497 (Models - 4 only) 12
Leece-Neville, type E7A (J5 only) 22
Starter
Auto-Lite, type MBG or MZ (Models - 3 only) 16
Delco-Remy, type No. 10749 (Models - 3 only) 16
Delco-Remy, type No. 10750 (Models - 4 and 5 only) 16
Fuel Pump
AC, type No. 10739  3
Hydraulic Pump
Pesco Model 196-C (Models - 4 only)  3
Pesco Model 196-CE (J5 only)  3
Vacuum Pump
Pesco Model 194-E (Models - 4 only)  4
Pesco Model B-12 (J5 only)  5
The following accessory drives are provided:
Direction of
Rotation, C
= Clockwise Drive Speed Maximum

Accessory
Nearest AN
Pad
Designation
CC =
Counter-
clockwise
(X
Crankshaft
RPM)
Maximum Torque (in. -
lbs.)
Continuous           Static
Overhang
Moment (in.
lbs.)
Starter None CC 11.444: 1 - - - - 240 30
*Generator None CC 1.000: 1 8 15 45
**Generator None CC 1.650: 1 8 15 45
***Generator AND 10002 C 1.160: 1 600 3600 100
Tachometer AND 10005 CC 0.500: 1 20 60 2
**Vacuum or
   Hydraulic
   Pump AND 10000 C 1.000: 1 75 300 25
Vacuum or
   Hydraulic
   Pump AND 10000 CC 1.269: 1 150 2250 25
*All except 6ACT-298-J4 and J5
** -J4 only
*** -J5 only
NOTE 4.    The corresponding commercial model designations or military engine models installed in
   certificated aircraft must be incorporated on the engine nameplate at least by the first overhaul period.
NOTE 5.    Approval expired 11/5/50.  No engines of these models manufactured after the date shown
   below or with serial numbers above those listed are eligible for use in certificated aircraft:
Models Date Last Engine Manufactured Serial No.
6AC-298-D2, D3 9/23/43 400123
6AC-298-E2, E3, F2 12/12/40 400108
6AC-298-F3 12/30/44 400225
6ACT-298-J4 8/30/43 400156
6ACT-298-J5, -M4 3/25/46 3-522116
```

## ADs (1, in force first)

- [AD 69-09-01](https://openairdocs.org/ad/69-09-01): Eisemann Magnetos · Eisemann Magnetos, 2A4-45-B2, 2A4-49-B2 and 158 more

## Registered aircraft by registry model (OpenAirDocs)

- [Franklin 6ACT298 series](https://openairdocs.org/engine/franklin-6act298-series): 4 aircraft (registry code 27017)
- [Franklin 6AC298 series](https://openairdocs.org/engine/franklin-6ac298-series): 2 aircraft (registry code 27016)

## STCs approved under this data sheet (1)

- [STC SE04651CH](https://openairdocs.org/stc/SE04651CH): To allow use of l00R grade aviation fuel meeting Swift Fuel, LLC specification SPEC-l00R-22. Swift Fuels LLC

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.