SCREAMIN' PRO RACING PARTS EAGLE® - Harley-Davidson
SCREAMIN' PRO RACING PARTS EAGLE® - Harley-Davidson
SCREAMIN' PRO RACING PARTS EAGLE® - Harley-Davidson
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Selecting a Camshaft by the numbers<br />
The intake closing point relative to bottom center listed in the table below<br />
can be used as a general indicator for the shape of the torque curve. Earlier<br />
intake closing values will result in higher torque at low engine speeds<br />
(along with lower horsepower at higher engine speeds). Later intake values<br />
will result in higher horsepower at high engine speeds (along with lower<br />
torque at low engine speeds).<br />
Intake Closing<br />
(degrees ABDC)<br />
Less than 30°<br />
Early intake closing indicates a low-speed torque cam.<br />
30° – 50° Medium intake closing indicates a midrange torque cam.<br />
Greater than 50° Late intake closing indicates a high-speed power cam.<br />
Intake closing values are just one indicator of the shape of the torque<br />
curve. Camshaft lift and duration along with the cylinder head’s port size<br />
and flow, engine displacement, compression ratio, and throttle size also<br />
play a roll in the shape of the torque curve.<br />
Valve Timing Events (SE-266E shown)<br />
TDC = Top dead Center (piston at very top of cylinder)<br />
ATDC = after Top dead Center<br />
BTDC = Before Top dead Center<br />
BDC = Bottom dead Center (piston at very bottom of cylinder)<br />
ABDC = after Bottom dead Center<br />
BBDC = Before Bottom dead Center<br />
cam specifications<br />
TDC<br />
Part Lift @ Valve Duration @ .053 Timing @ .053 Lift @ Valve<br />
Description Number Popularity Intake/Exhaust Intake/Exhaust Lift Open/Close Intake/Exhaust<br />
Stock — — .484"/.484" 198°/222° Intake: 12° ATDC/30° ABDC 0.041"/.102"<br />
Cam Specs Exhaust: 38° BBDC/04° ATDC<br />
SE-203 25937-99B **** .510"/.483" 234°/239° Intake: 18° BTDC/36° ABDC 0.178"/.152"<br />
Midrange TQ $329.95 Exhaust: 42° BBDC/17° ATDC<br />
SE-204 25149-00 *** .508"/.508" 236°/240° Intake: 22° BTDC/34° ABDC 0.208"/.129"<br />
Midrange TQ $329.95 Exhaust: 52° BBDC/08° ATDC<br />
SE-211 25152-00 *** .508"/.508" 248°/256° Intake: 23° BTDC/45° ABDC 0.203"/.170"<br />
Midrange TQ $329.95 Exhaust: 59° BBDC/17° ATDC<br />
SE-251 25121-03 ** .579"/.579" 244°/250° Intake: 18° BTDC/46° ABDC 0.178"/.158"<br />
Midrange TQ $329.95 Exhaust: 56° BBDC/14° ATDC<br />
SE-253 25376-03 ** .538"/.538" 240°/256° Intake: 7° BTDC/53° ABDC 0.119"/.158"<br />
Hi Speed HP $329.95 Exhaust: 59° BBDC/17° ATDC<br />
SE-257 25155-00 ** .569"/.569" 252°/260° Intake: 24° BTDC/48° ABDC 0.213"/.200"<br />
Midrange TQ $329.95 Exhaust: 59° BBDC/21° ATDC<br />
SE-258 25137-00 * .569"/.569" 258°/268° Intake: 26° BTDC/52° ABDC 0.224"/.208"<br />
Hi Speed HP $329.95 Exhaust: 65° BBDC/23° ATDC<br />
SE-260 25122-02 * .609"/.609" 263°/269° Intake: 28° BTDC/55° ABDC 0.236"/.213"<br />
Hi Speed HP $329.95 Exhaust: 65° BBDC/24° ATDC<br />
SE-266E 25400029 * .658"/.658" 262°/266° Intake: 24° BTDC/58° ABDC 0.208"/.178"<br />
Hi Speed HP $329.95 Exhaust: 69° BBDC/17° ATDC<br />
Theoretical based on rocker arm ratio of 1.65. Valve train components, operation temperature and tolerance stack-up will affect actual lifts.<br />
NOTE: separate purchase of Cam spacer Kit P/N 25938-00 is recommended for ’99-’06 Touring, ’01-’06 softail ® and ’04-’05 dyna ® models.<br />
These kits contain five different spacers to achieve proper sprocket alignment. Individual spacers can be purchased separately.<br />
Cam Kits 85<br />
Twin Cam models
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