Page 11 of 2007 Catalog by TP Engineering

toll free 866.873.6446 · outside the usa 203.744.4960 · www.tpengineering.com tp compression releases tp forged roller rockers unsurpassed strength tp engineering s roller rocker arms are forged from 4140 steel cnc machined for a perfect fit and shot-peened for additional strength they include solid bronze bushings for extended life our roller tips reduce operating friction so well they can give extra horsepower over your stock rockers strongest rocker arms money can buy guaranteed not to break smooth start-ups give your starter a helping hand with pro-series® compression releases available with either a machined billet top or a customizable shrader-threaded top that lets you install your favorite tire valve-stem cap just push the button before you hit the starter and these valves will release just enough pressure to make starting your engine a breeze as soon as the engine starts our pro-series® compression releases will reset themselves automatically tp engineering also offers machine-shop services ­ send us your cylinder heads and we ll install the compression releases for you give our service department a call and they ll be happy to assist you customizable top if you break this forging we will replace them it free fits all evo-style big twin sportster and twin cam engines billet top 45-4020-21 45-4021-21 billettop customizabletop compression release system 1 press the button and the compression release valve is open 2 engage the starter with the compression release open as the piston rises on its compression stroke just enough of the cylinder s pressure is allowed to escape through the vent hole in the body of the valve less cylinder pressure means its easier for the starter to push the piston past the top of its compression stroke 3 as soon as the cylinder s charge is ignited by the spark plug the resulting explosion immediately forces the compression release closed the valve s design ensures a complete seal 4 customizable compression releases are standard equipment on all pro-series engines 45-0245-23 setoffour 20 24 21 24

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