It's a paper that lists all the important specs of the cam. Camshaft Basics and Terminology. of lift. The Camshaft is the "heart" of the gasoline engine. What information does it provide? Harley-Davidson Camshaft Specifications (TC, EVO, Shovelhead, XL EVO, Iron Head, XR) Engine TypeManufacturer Cam Grind Bolt in ? **551 cams are not recommended with compression ratio of 10:1 or higher. Camshaft basics explained. Part number Please click Accept Cookies to continue to use the site. For solid lifter cams I propose a standard of measuring duration at 0.040 net lift. Specs @ 0.50 Cam Lift Opens Closes Duration SAE Specs@ (0.06/Rocker Arm Ratio) Cam Lift Opens Closes Duration Cam Lift Gross Valve Lift Center Line C/L Rocker Arm Ratio Valve Lash Clearance C-400-P INT. Your engine will not perform to it’s highest potential unless the cam is precision ground to provide performance at the speeds that you require. With this definition, 040 net lift is the same as 0.050 gross lift for 0.010 lash and a 1:1 rocker ratio, and for 0.015 lash and a 1:1.5 rocker ratio. It does not necessarily hurt the top-end, particularly if it's combined with a later intake valve opening. Many times, the information provided is not consistent between brands. Each new camshaft will include a "cam card". CAMSHAFT SPECIFICATIONS Part No. Been searching cam specs for and found these online and thought I would share. 1 BTC 42 ABC 223 30 BTC 80 ABC 290 .298 .447 114 1.5 HYD EXH. Note: Although several cam grinds were used in stock engines from 1999-’06, the timing specs of the 475G cams is most similar to cams used in 1999-’03 EFI engines. Note: the amount of overlap also depends on the cam's intake valve opening specifications. Where 0.040 net lift is equivalent to a gross lift of 0.040 + (valve lash)/(rocker ratio). Cam Glossary 2.0: The 5 Key Camshaft Specs You Need to Know Posted by David Fuller on March 29, 2012 at 12:10 pm Summit Racing recently put together an A-to-Z glossary of camshaft and valvetrain terminology , which covers everything from advance to valve margin. Cams Explained... What you need to know about Cams. Lift, duration, Lobe separation angle and overlap, what you need to know before choosing a camshaft. If the intake valve opens AFTER TDC, use a negative value. Intake Open Intake Close Exhaust Open Exhaust Close Intake Duration Exhaust Duration Overlap Intake Lobe Center Exhaust Lobe Center Lobe Sep. May 30, 2012. Everything else in your engine may be performing tip-top, the carburetor and ignition systems for example. However, most cam cards will include: (Click the links to learn more about each spec.) However, if you want to find the duration for the camshaft in your engine, you can calculate it. Video: Understanding Camshaft Specifications - OnAllCylinders Using a Dial Indicator and Degree Wheel, find the opening and closing points of the valves at 0.050 in. The cookie settings on this website are set to 'allow all cookies' to give you the very best experience. Each manufacturer's cam card will vary. Early exhaust valve closing yields a smoother operating engine. Calculate it Accept cookies to continue to use the site 's combined with later. 0.050 in 0.040 net lift is equivalent to a gross lift of 0.040 + valve. Important specs of the gasoline engine amount of overlap also depends on the cam the valves 0.050... The very best experience provided is not consistent between brands set to 'allow all cookies ' to give you very... Include a `` cam card '' TDC, use a negative value depends on the cam 's intake opening... 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