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TPI Specialties was founded by Myron Cottrell, a professional engine builder, who had bought a new Chevrolet Corvette in 1985 and was intrigued by the potential for improvement in its Tuned Port Injection fuel injection system.
The LB9 "Tuned Port Injection 5.0L" was introduced in 1985. At its core was the stout L69 shortblock and it used the same aggressive L69 camshaft profile. The induction system was unlike any system used previously by GM.
All V8s now received factory roller camshafts, and faced with consumer demands for more power, GM officially released the new 5.7L with tuned port fuel injection. Available only with an automatic transmission, it produced 215 hp and takes the top performance seat from the 5.0L TPI which was rated at 205HP.
This engine is referred to as the Series I 3800, or 3800 TPI (Tuned Port Injection). In Australia, the LN3 was also replaced by the L27 by Holden who used the engine in their series 2 (1991) VN Commodore range. However, the Australian L27 retained the LN3's one piece upper intake and lower plenum.
It now features port injection, [clarification needed] larger turbochargers, changes to the valvetrain timing, and a new exhaust system for improved efficiency and emissions. [3] The M279 also uses single overhead camshafts with 3 valves per cylinder, and has an identical bore and stroke compared to before. [4]
The Toyota GR engine family is a gasoline, open-deck, piston V6 engine series. The GR series has a 60° die-cast aluminium block and aluminium DOHC cylinder heads.This engine series also features 4 valves per cylinder, forged steel connecting rods and crankshaft, one-piece cast camshafts, a timing chain, [1] and a cast aluminium lower intake manifold.