Changes we make are mainly achieved by removing material from the head which changes the shape and dynamics of the flow through the port. Some tuning shops add material (by welding or using epoxy resins) to the port to change its shape. However, although this is a valid modifcation in terms of flow improvement, most race series do not allow adding material to the port profile. Our heads are mainly aimed at racing and hence we do not add material to the port. They are fully legal for most competition uses.
The Port flow analyzer sofware we use is designed to “streamline” the recording, calculating, reporting and graphing of cylinder head flow bench data. It makes flow testing faster and more accurate and assists the experienced gas flow engineer in achieving the optimum design. It is important to realise that this technology does not do the job for the gas flow expert. In many respects it makes the job more difficult because of the sheer amount of information it can provide. However, properly used with the intuitive science of our gas flow guru, the results are outstanding.
Power improvements at the “cutting edge” of racing come from minor improvement in details. For cylinder heads, these details not only include flow, but port velocity, swirl and tumble motion. The Port Flow Analyzer software we use has options for port velocity mapping with a pilot tube, swirl and tumble measurement (using our swirl meter and our tumble adapter), port stability, etc. Using these features and the processing power of the computer (and some fairly advanced physics contained within) we are able to predict the potential power of an engine fitted with this head from the flow bench !!. This power prediction is amazingly accurate to within 1% and has been verified on our engine Dyno.