{{Short description|Open-wheel Grand Prix motor racing car}} {{Infobox racing car | image = 1933 Maserati 4 CM 2000.JPG | name = Maserati 4CM<ref>{{Cite web|url=https://www.ultimatecarpage.com//spec/534/Maserati-4CM-1500.html|title=1934 - 1938 Maserati 4CM 1500 Specifications|website=Ultimatecarpage.com}}</ref> | designer = Maserati | production = 1932-1938 | assembly = | predecessor = Maserati Tipo 26 | successor = Maserati 6CM | platform = | configuration = FR layout | engine name = {{cvt|1.1-2.5|L|cuin}} I4 | gearbox name = 4 speed manual transmission | chassis = Steel box-section frame, aluminum body | front suspension = Rigid axle, semi-elliptic leaf springs, friction shock absorbers | rear suspension = Live axle, semi-elliptic leaf springs, friction shock absorbers | wheelbase = {{cvt|2400|mm|in}} | length = {{cvt|3680-4000|mm|in}} | width = {{cvt|1480-1500|mm|in}} | height = {{cvt|1200-1350|mm|in}} | track = {{cvt|1200|mm|in}} (front and rear) | weight = {{cvt|580|kg|lb}} | caption = 1933 Maserati 4CM }} The '''Maserati 4CM''' is an open-wheel Grand Prix motor racing car, designed, developed and built by Italian manufacturer Maserati, in 1931.<ref>{{Cite web|url=https://www.ultimatecarpage.com/car/534/Maserati-4CM-1500.html|title=1934 - 1938 Maserati 4CM 1500 - Images, Specifications and Information|website=Ultimatecarpage.com}}</ref><ref>{{Cite web|url=https://www.supercars.net/blog/1932-maserati-4cm-1100/|title=1932 Maserati 4CM 1100 | Maserati|date=April 18, 2016}}</ref>
In 1930, Maserati decided to concentrate its efforts on the voiturette class, which was not contested by German manufacturers such as Mercedes-Benz and Auto Union. The {{cvt|1100|cc|L cuin}} Tipo 4CM was Maserati's first racing voiturette.<ref>{{Cite web |title=Bonhams : 1937 Maserati 4CM Monoposto Chassis no. 1128 Engine no. 1128 |url=https://www.bonhams.com/auction/27987/lot/559/1937-maserati-4cm-monoposto-chassis-no-1128-engine-no-1128/ |access-date=2023-02-04 |website=www.bonhams.com |language=en}}</ref> The name of the car is derived as follows: 4: 4-cylinder engine; C: Corsa, for racing; M: Monoposto, for single seater.left|thumb|1937 Maserati 4CM Built alongside the 4CS two-seater sports-racer, the 4CM was powered by a {{cvt|1088.4|cc|cuin}}, (65 x 82 mm) twin-overhead-camshaft supercharged four-cylinder engine that produced {{cvt|125|hp-metric|kW|0}} at 6,600rpm, an output sufficient to propel it to a top speed of {{cvt|210|km/h|mph|0}}. Some cars came with a spare cylinder block, pistons, connecting rods and supercharger enabling it to be converted to {{cvt|1495.7|cc|L cuin}}, (69 x 100 mm) when required. Depending on the size of the engine, the roots-type supercharger boosted power to {{cvt|90-150|hp-metric|kW|0}}.<ref>{{Cite web|url=https://www.conceptcarz.com/z27195/maserati-4cm.aspx|title=1933 Maserati 4CM|website=conceptcarz.com}}</ref><ref>{{Cite web|url=https://primotipo.com/tag/maserati-4cm/|title=Maserati 4CM – primotipo…|website=primotipo...}}</ref>
It succeeded the Maserati Tipo 26M, and was itself slowly replaced by the Maserati 6CM around 1936.<ref>{{Cite web|url=https://www.motorsportmagazine.com/archive/article/june-1977/52/maserati-4cm|title=Maserati 4CM|website=Motor Sport Magazine}}</ref><ref>{{Cite web|url=https://www.goldenera.fi/main.htm|title=THE GOLDEN ERA OF GP RACING - MAIN DIRECTORY|website=www.goldenera.fi}}</ref>
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== Technical Information == {| class="wikitable" ! ! 4CS-1100 ! 4CM-1100 ! 4CM-1500 ! 4CM-2000 ! 4CM-2500 |- | Engine | colspan="5" align="center" |straight-four engine |- | Displacement | colspan="2" align="center" |{{convert|1088|cc|L|1|order=flip|abbr=on}} | align="center" |{{convert|1496|cc|L|1|order=flip|abbr=on}} | align="center" |{{convert|1970|cc|L|1|order=flip|abbr=on}} | align="center" |{{convert|2483|cc|L|1|order=flip|abbr=on}} |- | Bore × stroke | colspan="2" align="center" |{{Convert|65 x 82|mm|in|abbr=unit}} | align="center" |{{Convert|69 x 100|mm|in|abbr=unit}} | align="center" |{{Convert|80 x 98|mm|in|abbr=unit}} | align="center" |{{Convert|84 x 112|mm|in|abbr=unit}} |- | Compression ratio | colspan="2" align="center" |5.1:1 | align="center" |6.0:1 | align="center" |5.8:1 | align="center" |5.8:1 |- | Power | colspan="2" align="center" |{{cvt|90|hp-metric|kW|0}} at 5,300 rpm | align="center" |{{cvt|150|hp-metric|kW|0}} at 6,000 rpm | align="center" |{{cvt|165|hp-metric|kW|0}} at 5,500 rpm | align="center" |{{cvt|195|hp-metric|kW|0}} at 5,300 rpm |- | Valve control | colspan="5" align="center" |two overhead camshafts / two valves per cylinder, Roots supercharger |- | Body and frame | colspan="5" align="center" | aluminium body on ladder frame |- | Wheelbase | align="center" |{{convert|2700|mm|in||abbr=on}} | colspan="3" align="center" |{{convert|2400|mm|in||abbr=on}} | align="center" |{{convert|2450|mm|in||abbr=on}} |- | Curb weight (without driver) | align="center" |{{cvt|630|kg|lb|abbr=unit}} | colspan="3" align="center" |{{cvt|580|kg|lb|abbr=unit}} | align="center" |{{cvt|600|kg|lb|abbr=unit}} |- | Top speed | align="center" |{{cvt|150|km/h|mph|0}} | align="center" |{{cvt|185|km/h|mph|0}} | align="center" |{{cvt|190-230|km/h|mph|0}} | align="center" |{{cvt|215|km/h|mph|0}} | align="center" |{{cvt|220|km/h|mph|0}} |}
==References== {{reflist}}
{{Maserati}}
4CM Category:Grand Prix cars