Sunday, November 17, 2013
Engine Building Specs
Whether you want to improve your current engines performance or need an engine replacement for your vehicle, building your own engine can save you money and guarantee you get the engine you want. Before you build your engine you have to decide what specifications you want your engine to meet and the parts and accessories you want to use. Do not dry to build your own engine unless you have the necessary training and experience.
Compression Ratio
A fundamental specification for a combustion engine is its compression ratio. The compression ratio of an engine is the volume ratio of the combustion chamber before and after the pistons compression stroke. This ratio specifies how much the engines fuel is compressed when the piston is at its highest point. Compression ratios of 8.5 to 1 to 9 to1 are recommended for vehicles running on 91 to 93 octane gas.
Heads
Install higher-flowing heads to generate more horsepower than your stock heads. Choosing aluminum heads, which are better at dissipating heat, can give you around 1 pound per square inch more pressure than cast-iron heads.
Pistons
Use forged pistons for all engine-building applications. You can also use cast and hypereutectic pistons, but you should limit them to engines with 450 to 500 horsepower.
Exhaust System
The size and design of your headers will determine if you have a low-end torque or high-revolutions-per-minute horsepower.
Carburetor
Your carburetor mixes air with gasoline vapor in the right proportions and supplies the mix to your engine. You need a carburetor that supplies metered amounts of gas at precisely the right time and that can handle the rate of gas your car requires. The volume rate capability of the carburetor you choose will vary depending on the horsepower of your car. Engines up to 500 horsepower should have a carburetor with at least a 600-cfm (cubic feet per minute) rating.
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