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Low-speed pre-ignition (LSPI), also known as stochastic pre-ignition (SPI), [1] is a pre-ignition event that occurs in gasoline vehicle engines when there is a premature ignition of the main fuel charge. [2] LSPI is most common in certain turbocharged direct-injection vehicles operating in low-speed and high-load driving conditions. [3]
Announced in 2016, Arctic Cat reintroduced the Thundercat nameplate on their most powerful snowmobile of the 2017 line-up, after a 15 year gap. This iteration features a Yamaha-produced 998cc 4-stroke, DOHC engine with Turbo-charger, capable of excess of 200hp. [ 5 ]
A variation of the opposed-piston design is the free-piston engine, which was first patented in 1934. Free piston engines have no crankshaft, and the pistons are returned after each firing stroke by compression and expansion of air in a separate cylinder. Early applications were for use as an air compressor or as a gas generator for a gas turbine.