Tolerance

An acceptable range of measurements

Two Stroke Engine

A two stroke engine is an engine that completes its thermodynamic cycle of intake, compression, combustion and exhaustion in two strokes of the piston and one rotation of the crankshaft. Two stroke engines were widely used earlier in bikes and cars but now most manufacturers have moved on to four stroke engines as they are less polluting. Two strokes are still used where more power is required, such as ships and big trucks.

Turbocharger

A turbocharger is a forced induction device that is driven by the engine exhaust gases to produce more power from an engine of given size. This is done by compressing the air entering the engine and thus increasing the mass of air entering the engine so more fuel can be burned, which in turn increases the power of the engine.

Turbo Lag

A turbo lag is the delay in speed change in response to the throttle change. This happens in engines fitted with turbochargers as the turbochargers are run by the exhaust gases so there is a delay while the pressure of exhaust rises enough to turn the turbocharger faster. This delay does not happen in a supercharged engine.