Type

A65

A75

C75

C85

Type Certificate No.

205

213

233

252

Cylinders

Bore (inches)

3 7/8

3 7/8

4 1/16

4 1/16

Stroke (inches)

3 5/8

3 5/8

3 5/8

3 5/8

Compression Ratio

6.3:1

6.3:1

6.3:1

6.3:1

Piston Displacement (cu. in.)

171

171

188

188

Performance

Rated Power (Sea Level)

65

75

75

85

Rated R.P.M.

2300

2600

2275

2575

Max. Allowed Pressure (in. Hg.) at rated R.P.M. at Sea Level

29.4

29.3

29.2

29

Recommended Cruising R.P.M.

2150

2350

2275

2400

Max. Recommended Manifold Pressure (in. Hg.) for cruising at Sea Level

26.8

26

24

24.5

Fuel & Oil

Minimum Fuel Grade

80/87

80/87

80/87

80/87

Oil Pressure at Cruising (p.s.i.)

30-35

30-35

30-35

30-35

Min. Idling Oil Pressure (p.s.i.)

10

10

10

10

Min. Oil Temperature °F

75

75

75

75

Maximum Oil Temperature °F

220

220

225

225

Maximum Cylinder Head Temp. °F

550

525

550

540

Approx. Fuel Consumption in g.p.h. Cruising

4.4

4.8

4.8

5.4

Approx. max. Oil Consumption in Qts per Hour

0.37

0.4

0.37

0.4

Oil Sump Capacity in Quarts

4

4

4 1/2

4 1/2

Tappet Clearance in inches

Operating

0

0

0

0

Lifters deflated

.030-.110

030-.110

.030-.110

.030-.110

Ignition Timing B.T.C.

Right

30°

29°

28°

28°

Left

30°

32°

30°

30°