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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.
Myron Cottrell’s brother, John Cottrell, bought a 1999 Chevrolet Monte Carlo NASCAR Busch Series race car and modified it to make it street legal. In 2006 the car received an appreciative mention from Car Craft Magazine after appearing at the Car Craft Summer Nationals auto show, and in 2006 it was run at Bonneville Speedway on the Bonneville Salt Flats and achieved a best official speed of ...
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.
Today, the term chip tuning can be misleading, as people will often use it to describe ECU tuning that does not involve swapping the chip. Modern electronic control units can be tuned by simply updating their software through a standard interface, such as On Board Diagnostics. This procedure is commonly referred to as engine or electronic ...
It has a 10.2:1 compression ratio, Sequential multi-port fuel injection, and a bore and stroke of 94 mm × 85.6 mm (3.70 in × 3.37 in). Lower-powered versions only have variable cam phasing on the inlet cam (LE0). Selected models also include variable exhaust. The engine weighs 370 lb (170 kg) as installed.
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. [17] Typically, multi-point injected systems use multiple fuel injectors, [ 18 ] but some systems, such as GM's central port injection system, use tubes ...
However, single-point injection does not allow forming very precise mixtures required for modern emission regulations, and is thus deemed an obsolete technology in passenger cars. [1] Single-point injection was used extensively on American-made passenger cars and light trucks during 1980–1995, and in some European cars in the early and mid-1990s.
Port injection refers to the spraying of the fuel onto the back of the intake valve, which speeds its evaporation. [ 1 ] An indirect injection diesel engine delivers fuel into a chamber off the combustion chamber, either a prechamber or swirl chamber, where combustion begins and then spreads into the main combustion chamber.