Page 8 of 2007 Catalog by TP Engineering

toll free 866.873.6446 · outside the usa 203.744.4960 · www.tpengineering.com tp pro-vent rocker boxes rocker box oil separation vent system tp s patented pro-ventŪ system separates oil and air without any moving parts or one-way valves here s how it works 1 oily air is forced out of the crankcase and blown into the cam chest through the pushrod tubes and into the first chamber of the pro-ventŪ system 2 oily air is forced thru three entry holes that begin the process of extracting oil droplets from the vapor each surface touched by the breather gasses collects suspended oil an innovative fix for a dirty mess our patented design eliminates oil carry-over into your air filter without any moving parts pro-ventŪ rocker boxes were engineered as a two-piece design to provide a super-stable foundation for the rocker arms and to reduce the mechanical noise from the engine s valve train they are machined from 6061-t6 aluminum billet and chromed to a mirror-like finish put a set on your engine ­ enjoy how much quieter it runs and leave your rags at home rocker shafts gaskets and hardware included 3 the air collides with the walls of the chamber and is forced to make a series of turns before climbing the last wall and flowing through the entry hole into the next chamber 4 in the second chamber the breather gasses spin and collide with its walls and by the time the air climbs the final wall on its way out of the chamber it is free of oil and ready to enter the crossover channel in the rocker box cover which routes the air out of the head and into the air cleaner 45-2500-23 45-2501-23 45-2600-23 45-2601-23 evoengines,ballmilldesign evoengines,tplogo twincamengines,ballmilldesign twincamengines,tplogo all the air/oil separation is done in the rocker boxes the pro-ventŪ system performs so well that we were able to eliminate the timed rotating breather valve from our engines and achieve a 2 p.s.i decrease in crankcase pressure the advantages of the pro-ventŪ system on twin-camŪ engines are clear as well it does a better job removing oil from the engine breather gasses exiting the heads and its not time-sensitive because there are no rubber parts that harden over time and no foam to become saturated with oil tp pro-ventŪ rocker boxes are machined from 6061-t6 aluminum billet and the rocker shaft stanchions are an integral part of the rocker box base the rigidity and of this design significantly quiets the valve train noise characteristic of twin-cam engines the pro-ventŪ system solves the problem of how to separate oil from the crankcase s pressurized air in fact it works so well that pro-seriesŪ engines don t have a bottom breather cavity 14 24 15 24

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