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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 ...
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.
The Ramjet is a continuous-flow port-injection system. Unlike later fuel injection systems that used electronics, this one is based on purely mechanical principles. The two main sub-assemblies of the system are the air meter and the fuel meter. The air meter measures airflow into the engine and manages thermostatic warmup enrichment, fuel ...
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.
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Note the height and straightness of the ports, particularly the exhaust port on the left. This design is based on a cylinder head casting purpose-built for racing modifications. The head is supplied with small ports with ample material everywhere for porting specialists to shape to their requirements without having to weld on additional metal.
Beginning in 1988 the engine was redeveloped to include a balance shaft, with 165 hp (123 kW). For 1991 this engine, called the 3800 V6, made 170 hp (127 kW) with the addition of Tuned Port Injection. This LeSabre was re-introduced in 1991 for the 1992 model year, and was redesigned along the same lines as the previous year's Park Avenue. The ...