ZMZ-24

The ZMZ-24 was an automobile engine produced by Zavolzhye Engine Factory (Zavolzhye Motorni Zavod, ZMZ) in the Soviet Union.

The ZMZ-24 was an aluminium-block overhead valve (OHV) inline four design, an evolution of the ZMZ-21A, displacing 2,445 cc, and in its initial appearance, produced with chain-driven camshaft and compression ratio of 6.6:1; it produced 70 hp at 4,000 rpm and 123 lbft at 2,200 rpm. It was also produced as the UMZ 4178.10.

It "quickly became the mainstay of the Soviet engine industry", and would be used in a variety of vehicles.

The improved ZMZ-24D, found in the GAZ-24, ran on 92 RON gasoline (while the ZMZ-24-01 could use commonly available 76 octane, and the ZMZ-24-07 could use liquid propane). The cylinder block was die cast, instead of the slower coquille for the 21A. The engine featured a twin-choke carburettor, with a higher compression ratio, producing 95 hp at 4500 rpm and an even more impressive 186 N.m of torque at 2200–2400 RPM.

By 1970, the ZMZ-24 had been renamed the ZMZ-402.10, with a lower-compression 4021.10 version, which remained in limited production until 2006. In this format, it was used in the RAF minibus and ErAZ van.

It also served as the basis for the sixteen-valve 131 hp 2,287 cc ZMZ-4062.10 (seen in some Volgas after 1996), the 145 hp 2,463 cc ZMZ-40552.10 (used in GAZ's commercial vehicles), the 2,690 cc ZMZ-409.10 of the UAZ Patriot, and the ZMZ-5143 diesel all derive from the ZMZ-24.