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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.
It is a 60° 24-valve design with aluminum block and heads and sequential multi-port fuel injection. Most versions feature continuously variable cam phasing on both intake and exhaust valves and electronic throttle control .
Performance tuning is the tuning of an engine for motorsports. Many such automobiles may never compete but are built for show or leisure driving. In this context, the power output (e.g. In horsepower), torque, and responsiveness of the engine are of premium importance, but reliability and fuel efficiency are also relevant. In races, the engine ...
The off-center design continued up until the 1988 LN3 version of the engine, when the left-hand bank of cylinders was moved forward relative to the right-hand bank. Although the actual bore spacing between cylinders on the same bank remained unchanged at 4.24 in (108 mm), the LN3 and later engines became known to have "on-center bore spacing".
Mechanic fuel injection pump system "Kugelfischer" This system uses a three-dimensional cam. In early manifold injected engines with fully mechanical injection systems, a gear-, chain- or belt-driven injection pump with a mechanic "analogue" engine map was used. This allowed injecting fuel intermittently, and relatively precisely.
A port-map can be useful to determine opening/closing-timing and the area of specific ports. These diagrams are usually represented as a rolled out cylinder where the width equals the circumference and the height equals the stroke plus the cylinder skirt, the ports are outlined.
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 ...