Novarossi have introduced their all-new Mephisto .21 nitro on-road competition engine. The power plant utilises the new R4/18 conrod that was redesigned and is made from a special aluminium alloy for improved durability while retaining the low weight of the previous R4/17. Also new is the DLC-coated crankshaft with triple tungsten balance weights and silicone insert. The updated design optimises internal mixture flow while the lightweight shaft improves agility. The sleeve is of a 9-ports design with exhaust booster ports and the special shape ensures maximised performance while the compact 3-needle carburettor allows for better idling and quicker returning to low RPM after throttling. The engine’s features are rounded out by a new combustion camber insert specially developed for the use with 16 percent nitro fuel – a 25 percent insert is available separately – and they are topped off by a new 2-tone cooling head that provides optimised thermal efficiency and a low centre of gravity. The engine is available with all-steel or hybrid front steel, rear ceramic bearing.