Osella PA9/90 with BMW M12 & BMW S14 Engines Screaming on Mountain Roads!

Here's a video about some Osella PA9/90 prototypes I recorded in previous years at some Italian hillclimb races. It was built in 1989 by Osella Corse, an Italian company specializes in building sport cars for hill climbing and minor sport race championships, as an evolution of the PA9 (1981) and PA9B/84 (1984).

The PA9/90s were (and some of them still are) moved by a 2.0 liter BMW M12 (M12/7 - M12/10) engine which was able to produce around 300 bhp, depending on the evolution version used, and revving up to 10,000 rpm. The M12 was developed in 1973 when BMW decided to entered the Formula 2 championship as an engine supplier and where 2-liter engines with base and cylinder head derived from series production were required. The development started from their M10 ( initially known as the M115), a 1.5-liter 4-cylinder 16-valve engine already used in the German touring championship and also mounted on their production sedan of the time, the Neue Klasse.

For the first version of the M12, called M12/7, the bore of the M10 was slightly increased and titanium connecting rods and a mechanical injection pump were also adopted, with a compression ratio of 13: 1. The M12/7 was able to produce 290 hp, which increased to 330 in its latest evolutions in 1984 (and called M12/10). The M12 is mainly know for its turbo versions: M12/11, which was built to be used in the German Touring Car championship in 1977-78, and the M12/13, later rebadged 'Megatron', used in Formula 1).

Back to hillclimb racing, most of the PA9/90s nowdays are fielded in the over 2000cc class. This because afterwards some teams and drivers adopted a bigger BMW engine: the S14. Still based on the M10 block, it was used in the E30 M3 and E30 320iS. In particular on the the M3 the S14 had a 2.3-litre capacity which was later raised to 2,467cc with the introduction of the S14B25 EVO3 engine. Now I don't know if the S14s used on these Osellas are actually original S14B25s or 'just' the S14B23s, increased in capacity. But being race engines, they have lots of components and 'mods' findable on the M3 E30 DTM and Group A cars, which translates into powers in the 340-360hp range. The S14 had also more torque than the M12/7, making it more appropriate for hillclimb racing.

Almost all the PA9/90s you see in this video are powered by the S14, a part from the yellow one (number 194) at 2:14 or 6:50 and the light blue (number 106) from 2:52 till 3:33 and later at 7:42. A tip to visually understand if a PA9/90 is equipped by one or the other engine is by looking at the exhaust: if placed on the right part of the diffuser the engine under the hood is the S14, if placed on the left it's the M12.

#Osella #OsellaPA9 #BMW
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I have to thank my friends and youtubers ‪@Italiansupercarvideo‬ and ‪@MattyB727‬ for the great collaboration done during this event. Don't forget to subscribe to their channels!!

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Camcorder: Canon Legria HF G30 & GX10 + Canon DM-100 Microphone, Sony AX-53 + Audio Technica Microphone
Event: 32nd Bologna - Raticosa 2020 / Alpe del Nevegal 2015-2016-2017 / Trofeo Vallecamonica 2017 / Verzegnis - Sella Chianzutan 2016
Where: Pianoro Vecchio / Belluno / Malegno / Verzegnis, Italy

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