FU Engine

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The FU engine came on the "GFU", "FU" and "MPG" cars (USA-market B210 and B310 fuel economy champion models). F means Five-speed. G means GX trim (not dual carb). U means USA (FEDERAL, except California). They got up to 50 mpg (21 km/liter).

1977 B-210 50 MPG (US gallon = 3.78 liter)

B210

The FU model was a B210 Coupe fitted with A14 engine and 63a Five-speed transmission. The 5-speed was introduced to USA models from 1976-1/2, and to Canada models for 1977. 65 HP A14 with round ports.

5-speed models were only available in Coupe body style. All 5-speed models were fitted with FU engine. So for America, 5-speed was for fuel-economy, not performance option.

1977 B-210 Plus

• KHLB210FU: FEDERAL 5-speed
• KHLB210FUV: CALIFORNIA 5-speed
• KHLB210FUN: CANADA 5-speed [1978]

B310

A14 or A15 with 60-series five speed transmission. Available in all body styles: 2-dr, 4-dr, Coupe and Wagon.

• 0278-0780 HLB310FU 4-dr sedan, DX, A14
• 0278-0780 HLB310RFU 2-dr sedan, DX, A14
• 0278-1179 KHLB310FU Coupe, DX, A14
• 0278-1179 WHL310FU Wagon, DX, A14
• 1279-0780 PLB310RSFU 2-dr sedan, Standard, A15
• 1279-0780 KHLB310FU Coupe, DX, A15
• 1279-0780 WPLB310FU Wagon, DX, A15
• 0880- PLB310FU 4-dr, DX, A15
• 0880- PLB310RFU 2-dr, DX, A15
• 0880- HLB310RSFU 2-dr, STD, A14
• 0880- KHLB310FU Coupe, DX, A14
• 0880- WHLB310FU Wagon, DX, A14

65HP - Economy A14 Engine. This engine got 47 MPG in the B310 with 5-speed transmission.

1976-1978

B210 engine was A14. Standard A14 was 80 HP, but FU engine was 65 HP. Round ports contributed to superior low-rpm operation.

• Round ports, low with swirl (non-shrouded)
• Closed chamber (previously open chamber)
• Passive air induction (non-FU has air pump)
• 1977 compression ratio: 8.5 (5.37 mm dish)
• 1978 USA compression ratio: 9.0 (4.08 mm dish)

NOTE: All 1978 Canada models used this engine, even non-FU Canada cars.

• 1977 FU engine used 1978-style electronic ignition

1979-1980

Cylinder head features:

• quench wedge chambers
• round 28mm (?) lowered ports
• Has round intake ports (like the A12 head). It has two small coolant holes below the intake ports, to provide heat for the intake manifold.
• Unique Thermostat housing

1981-1982

All 1981-1982 US models, including A12A, A14 and A15 used the same head design. Even non-FU models.

• quench head
• smaller dish in piston
• 35 mm intake valve (previously 37 mm)
• shrouded intake valves
• change from round ports to Small Oval

• Standard Datsun 1200 style cooling fan (not the larger typical A14 style)