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[Web Creator] [LMSOFT]
Engine Building

This topic by itself could be larger than this whole site. I will try to provide some basic outlines in regard to improving engine performance. The basic function of a 4 stroke engine is to convert fossil fuel into energy by the cylces of Intake, Compression, Power and Exhaust. These cycles need to work in unicen, and changing one area by itself will not necessarily increase power. The modified combination of these cycles will.

Intake - Power can be gained by correctly modifying the intake path, depending on specific set-ups and requirements. This path generally consists of the air intake, air filter, carburettor, intake manifold, intake ports and intake valves.

Compression - This relates to the compression of unburnt fuel and oxygen. Increasing the engines compression ratio will allow the engine to produce more horsepower, but once again, this depends on specific set-ups and requirements.

Power - This is the controlled ignition of the compressed air/fuel mixture.

Exhaust - Waste Gases need to be scavenged and exit the combustion chamber efficiently, so that the cycle can continue. This path generally consists of exhaust valves, exhaust ports, exhaust manifold (or extractors), catalytic converter (ULP), exhaust pipe, muffler and resonator.

N.B. 1 Kw = 1.34 Hp

Camshaft selection is usually one of the most critical choices that will need to be made for any engine combination. There is absolutely no point in using a cam larger than what the heads and compression ratio will use. A huge camshaft in a standard engine can actually develope less taxable horse power than the standard configuration.

*As camshafts increase in profile (duration and lift), more compression is required. Compression will be limited to engine design and the fuel available/allowed/required.

*Increased intake and exhaust volumes will also be needed. More fuel will be required. A less restrictive/larger diameter exhaust and muffler combination will be needed.

*In automatic vehicles, a stall converter will be needed to allow the engine to "flare" to a predetermined value to allow the cam to enter it's torque curve before load is applied. Most standard torque converter stall rates are around 1600 to 1800 rpm. As the cam profile increases, the size of the stall converter will increase.

*Diff ratio will need to change.
Phoenix Mechanical
Soaring