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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.
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.
Multi-point injection (also called 'port injection') injects fuel into the intake ports just upstream of each cylinder's intake valve, rather than at a central point within an intake manifold. [14] Typically, multi-point injected systems use multiple fuel injectors, [ 15 ] but some systems, such as GM's central port injection system, use tubes ...
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.
In 1985 Cottrell bought a new Chevrolet Corvette and was intrigued to learn how its Tuned Port Injection system worked. After determining that the system could be improved significantly, Cottrell established his company, TPI Specialties, and began building and marketing aftermarket parts kits for hot rodders . [ 1 ]
In some cases, they were built with black painted valve covers instead of the normal silver valve covers. Some also received a blank throttle body plate, like the LT1, instead of the normal plate with "Tuned Port Injection" script. The change was purely cosmetic, performance remained identical to the previous year.
Also called the 'Big Doggie', the ZR2 is a concept model based on a C4 Corvette, but with a much larger 7.4 L (454 cu in) big block OHV V8 engine with multi-port fuel injection similar to the tuned port injection found on the 1985–1991 base model and a 6-speed manual transmission. [24] [25]
The Mercedes-Benz M273 engine is a V8 automobile piston engine family used in the 2000s (decade). It was based on the similar M272 V6 introduced in 2004.. An evolution of the M113 V8, [1] all M273s have aluminium engine blocks, sequential port fuel injection, fracture-split forged steel connecting rods, a one-piece cast crankshaft, and a magnesium intake manifold.