Page 512

2016roadiron

512 S&S® CAMSHAFT OVERVIEW S&S offers a variety of cam grinds for 1999-up big twin engines in both chain drive and gear drive versions. S&S 475, 509 and 510 camshafts are bolt-in cams for 1999-’04. S&S 551, 570, 583, 585 cams are bolt-in cams for 2005-up engines. Cams that exceed the limits of the stock valve springs require the use of special high lift springs. Most S&S cams have higher lift than stock and are designed to take advantage of the extra flow of ported stock heads or S&S Super Stock® heads. Due to the high lift of these cams, S&S adjustable pushrods are recommended. Not all grinds are available in the chain drive version. To get the best performance from a performance cam installation, a high flow intake and exhaust system is also recommended. Easy start cams The most innovative S&S product since the electric compression release system, these cams will revolutionize the starting of late model big twins. Regardless of displacement or compression ratio, a stock starter and battery will now easily turn over any engine. These cams also install just as easily as non compression release versions and require no extra parts or machining! Available in both chain and gear drive S&S cams. How do easy start cams work? The heart of our Easy Start cams is a centrifugally retracted, spring loaded,compression release lobe milled into the heel of each exhaust lobe. At cranking speeds, the lobe bumps the exhaust valve open slightly during the compression stroke, making the engine much easier to turn over. Once the engine fires and reaches 800 RPM, the lobe swings out of the tappet roller path, allowing the engine to run normally and with full compression Recommended applications for S&S Cams MR103: Designed as bolt-in cams for 103 CID engines with stock 9.7:1 compression ratio up to 10.5:1. Works well with stock, un-ported heads, but is great for S&S CNC ported heads. More power across the rpm range best results form 2500-5500 rpm. Bolt-in. HP103: Designed as bolt in cams for engines with 103 and stock 9.7:1 compression up to 10.5:1. Works well with stock, unported heads, but is great for S&S CNC ported heads. Best power in the higher rpm range, 3000-6000 rpm. Bolt-in. 509: Designed as a bolt-in, high torque cam for 1999-’06 models. 180 psi cranking compression, no need for compression releases. For 88 CID engines with stock compression ratio. Idle-4500 rpm. 510: Designed as a bolt-in cam for 88, 95, and 96 CID engines with compression ratios below 9.7:1, it is primarily intended for use with stock, un-ported heads. 3000-5500 rpm. 551: Designed for engines with 96 to 106 CID and 9:1 to 9:9 compression this is a bolt-in cam set designed for stock or mildly modified touring bikes. Cams are not recommended for compression ratios of 10:1 or greater. Greatly improves low-end and midrange torque, strongest from idle- 4000rpm. 570: Designed for 88 to 96 CID engines with compression ratios between 9:1 and 10:1 this cam will provide a nice power increase across the entire power band. 3200-5700 rpm. 583: Optimized for use in the Softail®/Dyna® lines, this cam makes horsepower and torque that you can feel all the way through the rpm range, making the most power right where you need it:1500–5000rpm 585: Designed for 88 to 96 CID engines with compression ratios from 9:1 to 10:1 and 100 to 111 CID engines from 9.7:1 to 10.5:1 compression. Provides massive horsepower and torque increases starting at 3000rpm and holds steady all the way to redline. 3500-6000 rpm for 88” - 96” engines and 2500- 5500 for larger engines. 625: Cam set designed for 95” or larger engines with compression ratios between 10.0 and 10.75:1. 3000-6000 rpm. 635 H.O.: High lift cam for modified engines with 106” or greater displacement and compression ratios between 10.0:1 and 11.0:1. Works well with stock, unported heads, but S&S CNC ported heads are recommended. Best power from 3000-6000 rpm. This is not a bolt-in cam set. High-lift springs and clearance checks are required. 640: Used in S&S T124 engines, this cam is designed to make horsepower. Intended for engines of 95 CID or more with compression ratios between 10.5:1 and 11.5:1. 3000-6000 rpm. 675: A high lift monster, this cam set is designed for 120” or larger engines with at least 11:1 compression ratio. 4500-6500 rpm. Specifications For S&S Camshafts For 1999-up Big Twins The chart below shows the specifications for S&S camshafts by cam name (grind). The specifications for a particular cam name are the same for chain drive and gear drive cams. Note that not all cam grinds are available in all styles. Specifications of S&S® Chain Drive and Gear Drive Camshafts for 1999-UP Big Twin Cam name Valve Timing (open/close) Valve Duration Valve Lift Centerline Lift @ TDC Intake Exhaust Intake Exhaust Intake Exhaust Intake Exhaust 509 18˚/18˚ 46˚/11˚ 216˚ 237˚ .509” 90˚ 107.5˚ .174” .140” 510 20˚/38˚ 52˚/20˚ 238˚ 252˚ .510” 99˚ 106˚ .187” .178” 551** 17˚/19˚ 41˚/17˚ 216˚ 238˚ .550” 91˚ 102˚ .178” .170” 570 20˚/40˚ 55˚/20˚ 240˚ 255˚ .570” 100˚ 107.5˚ .187” .179” 583 5˚/18˚ 58˚/24˚ 203˚ 262˚ .583” 96.5˚ 107˚ .113” .206” 585 20˚/45˚ 60˚/20˚ 245˚ 260˚ .585” 102.5˚ 110˚ .186” .179” 625 20˚/55˚ 60˚/120˚ 255˚ 260˚ .625” 107.5˚ 110˚ .189” .184” 640 25˚/60˚ 65˚/25˚ 265˚ 270˚ .640” 107.5˚ 110˚ .228” .214” 675 25˚/64˚ 70˚/25˚ 269˚ 275˚ .675” 109.5˚ 112.5˚ .235” .206” **551 cams are not recommended with compression ratio of 10:1 or higher. S&S® Camshaft Specifications Cam name Valve Timing (open/close) Valve Duration Valve Lift Lobe Centerline Valve Lift @ TDC Intake Exhaust Intake Exhaust Intake Exhaust Intake Exhaust Intake Exhaust Open BTDC/Close ABDC Open BBDC/Close ATDC MR103 13°/33° 50°/22° 226° 252° .585” .585” 100° 104° .172” .177” HP103 20°/49° 45°/26° 249° 251° .575” .575” 102.7° 101.5° .199” .206” 635 H.O. 19.5°/43.5° 58.5°/37.5° 243° 276° .635” .635” 102° 100.5° .186” .284” NOTE: Stock valve spings in 1999-’04 big twin models can handle cams with valve lifts as high as .515”. Stock valve springs in 2005-up engines can accommodate valve lifts up to .590”


2016roadiron
To see the actual publication please follow the link above