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The Vixen used the BMW M21 Diesel engine
Here are the specs per Wikipedia
"The BMW M21 was a 2.4 L diesel straight-6 engine.
It was introduced in 1983 with the BMW M20 design as its basis. It was available with a turbocharger. It was also the last diesel sold in the North American market in the E28 before the reintroduction of a diesel by BMW in the North American market E90 in 2009, the BMW M57
Models Engine Displacement Power Torque Redline Year
M21D24 2.4 L (2443 cc/149 in³) 85 kW (114 hp) @ 4800 210 N·m (155 lb·ft) @ 2400 5350 1983
85 kW (114 hp) @ 4800 220 N·m (162 lb·ft) @ 2400 5350 1983
63 kW (84 hp) @ 4600 152 N·m (112 lb·ft) @ 2500 5150 1985
Applications:
1986-1992 E28 524d/524td, E34 524td
1985-1993 E30 324d/324td
1984-1985 Lincoln Continental Mark VII
1984-1985 Lincoln Continental
1986-1987 Vixen 21 TD and Vixen 21 XC
1992 UMM Alter II (Very rare UMM model, only 4 were made)"
Not sure what the curb weight of the Vixen was but it had to be pushing 5,000lbs I bet so they really had that engine loaded well which would make sense why it did so well fuel economy wise.
What modern diesel engines would be the best candidate for a swap as far as fuel economy?
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