Osella PA21

{{Short description|Prototype race car}}

{{Infobox racing car

| image = 74 - Fabrizio Fattorini - Osella PA21 Honda.jpg

| constructor = Osella

| chassis = Steel tube-frame with aluminum panels and fiberglass body

| category = Group CN

| front suspension = Double wishbones, coil springs over dampers, anti-roll bar

| rear suspension = Single top links, twin lower links, twin radius arms, coil springs over dampers, anti-roll bar

| platform =

| related =

| engine name = Various (mostly {{cvt|2.0|L|cuin}} Honda K20 I4{{Cite web|url=https://vongrose.com/blog/2020/4/1/sports-prototype-spotlight-2-osella-engineering-srl|title=Sports Prototype Spotlight #2 - Osella Engineering S.r.l. — Von Grose VMM|website=Von Grose|access-date=2022-06-22|archive-date=2022-06-22|archive-url=https://web.archive.org/web/20220622171630/https://vongrose.com/blog/2020/4/1/sports-prototype-spotlight-2-osella-engineering-srl|url-status=live}})
{{cvt|1.0-1.6|L|cuin}} I4 motorcycle engine (such as Hayabusa{{cite web|url=https://www.fia.com/sites/default/files/r11_2_final_classification_category_2.pdf|title=Final Classification|access-date=22 June 2022|archive-date=26 October 2021|archive-url=https://web.archive.org/web/20211026011914/https://www.fia.com/sites/default/files/r11_2_final_classification_category_2.pdf|url-status=live}} or S1000RR{{cite web|url=https://www.fia.com/sites/default/files/hcm_illustrated.pdf|title=FIA HILLCLIMB MASTERS|access-date=22 June 2022|archive-date=29 September 2021|archive-url=https://web.archive.org/web/20210929232251/https://www.fia.com/sites/default/files/hcm_illustrated.pdf|url-status=live}})

| power = {{cvt|200-270|hp|kW}}{{Cite web|url=https://racemarket.net/hill-climb-racing/hill-climb-cars-for-sale/osella-pa-21-evo-i3424|title=Osella PA 21 Evo|website=Racemarket.net | Europe's biggest racing marketplace network|access-date=2022-06-22|archive-date=2022-06-22|archive-url=https://web.archive.org/web/20220622171635/https://racemarket.net/hill-climb-racing/hill-climb-cars-for-sale/osella-pa-21-evo-i3424|url-status=live}}

| weight = {{cvt|370-538|kg|lb}}{{cite web|url=https://vongrose.com/blog#:~:text=Much%20like%20Osella's%20PA21%20S,538%20Kg%20(1%2C183%20lbs).|title=Sports Prototype Spotlight #6 - CMS Racing Cars|access-date=22 June 2022|archive-date=22 June 2022|archive-url=https://web.archive.org/web/20220622171609/https://vongrose.com/blog#:~:text=Much%20like%20Osella's%20PA21%20S,538%20Kg%20(1%2C183%20lbs).|url-status=live}}

| gearbox name = Sadev 6-speed sequential, mid-engined, rear wheel drive

}}

File:Osella PA21 Evo Omar Magliona.JPG

The Osella PA21 is a series of Group CN sports prototype race cars, developed and built by Italian manufacturer Osella. The cars mostly compete in hillclimb races, trials, and events. They are commonly powered by, and designed to be equipped with either a naturally-aspirated {{cvt|2.0|L|cuin}} Honda K20 engine, producing in excess of {{cvt|250|hp|kW}}, or a motorcycle engine, in the displacement range of {{cvt|1.0-1.6|L|cuin}}, such as a Suzuki Hayabusa, or an S1000RR motor.{{Cite web|url=https://www.osella.it/wrp/osella-unveils-the-pa21-jrb-first-racecar-specifically-designed-for-motorcycle-engines-in-class-e2b/|title=OSELLA UNVEILS THE PA21 JrB, FIRST RACECAR SPECIFICALLY DESIGNED FOR MOTORCYCLE ENGINES IN CLASS E2B|access-date=2022-06-22|archive-date=2016-07-15|archive-url=https://web.archive.org/web/20160715135437/http://www.osella.it/wrp/osella-unveils-the-pa21-jrb-first-racecar-specifically-designed-for-motorcycle-engines-in-class-e2b/|url-status=live}}{{Cite web |url=https://www.osella.it/wrp/en/portfolio-items/osella-pa-21s-evo-cn-2000-honda/ |title=Osella PA 21S Evo CN 2000 Honda – Osella Corse |access-date=2022-06-22 |archive-date=2016-07-15 |archive-url=https://web.archive.org/web/20160715182800/http://www.osella.it/wrp/en/portfolio-items/osella-pa-21s-evo-cn-2000-honda/ |url-status=live }}{{Cite web|url=https://www.osella.it/wrp/portfolio-items/osella-pa-21p-evo-cn-2000-honda/|title=2000 Honda PA 21P Evo CN Osella|access-date=2022-06-22|archive-date=2017-05-06|archive-url=https://web.archive.org/web/20170506153346/http://www.osella.it/wrp/portfolio-items/osella-pa-21p-evo-cn-2000-honda/|url-status=live}}{{Cite web|url=https://www.osella.it/wrp/portfolio-items/osella-pa-21-jrb-e2b/|title=E2B Pa 21 JrB Osella|access-date=2022-06-22|archive-date=2018-04-24|archive-url=https://web.archive.org/web/20180424165512/http://www.osella.it/wrp/portfolio-items/osella-pa-21-jrb-e2b/|url-status=live}}