David Vizard's top-selling How to Build Horsepower explains the latest and most effective engine building techniques and strategies. The reader is treated to the secrets and methods for building virtually any automotive engine. Vizard's unique and entertaining style of writing clearly explains the key principles and provides extreme detail and uncommon insight, so at-home engine builder can realize their performance goals.
The power valve opens when manifold vacuum drops below a certain predetermined level. This allows fuel from the float bowl to enter the emulsion well through both the main jet and the power valve restriction channel (PVRC). If the fuel calibrations are done with both optimal power and optimal cruise in mind, then the WOT calibrations should be done with the PVRC, not the main jet. The main jet should be sized for the best fuel economy under high-speed cruise conditions. In the right-hand illustration the power valve is closed. In the inset enlargement (left), its open and the fuel flow route can be seen.
Mounting a modern high-efficiency unit, such as this Magnacharger, on an intercooled base/intake manifold, leads to higher power on otherwise lower-octane fuel.
The latest Chrysler Hemi engine is an up-to-the-minute, high-tech design. In stock form, the heads flow as well as many good aftermarket heads for the small-blocks from GM and Ford. In ported form, they rival a set of 10,000 US Dollar Cup Car heads
The cam and valvetrain components chosen are critical to engine’s success as a power producer. The subject of optimal valve events has been poorly covered in countless books and magazine articles. In this chapter I will start you down the road toward what will actually work first time around in your engine.
This Ultra Pro Machining CNC-ported LS6 Chevy head not only had more flow but the intake swirl was also increased over stock. With a minimal cut out of the intake to keep velocity up, this head improved output at low RPM while delivering more than 40 hp over stock.
The RPM-induced advance, often referred to as mechanical advance, is tailored to suit the engine’s requirements by spring selection (yellow arrows) and the shape and mass of weights (white arrows).
This 3-inch Borla muffler flowed the same as a straight piece of pipe of equal length because its core flow was higher than the inlet- and exit pipe flow.
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