CAM LOBE PROFILE CATALOG - Crane Cams Australia

MECHANICAL ROLLER PROFILES
PROFILE CODE
DUR. AT .050”/
LOBE LIFT
ADVERTISED DUR.
AT TAPPET LIFT
DEG. IN.
DUR. AT
.200”
TAPPET LIFT
MECHANICAL ROLLER PROFILES
TAPPET LIFT AT
TOP DEAD CENTER
104 DEG.
INTAKE
114 DEG.
EXHAUST
GROSS VALVE LIFT WITH ZERO LASH AT
THEORETICAL ROCKER RATIO SHOWN
Continued on next page.
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DESIGN
LOBE SIZE
CODE
1.50 1.60 1.70 1.76 SEE PAGE 3
415
415 roller series created for oval track and endurance racing applications
with 50 mm journals. Recommended lash is .020" intake and .024" exhaust.
R-266/415 300 .0200 180 .138 .108 .623 .664 .707 .730 C
R-270/415 304 .0200 183 .144 .114 .623 .664 .707 .730 C
R-276/415 310 .0200 187 .154 .124 .623 .664 .707 .730 C
420
420 roller series created for oval track racing applications including sprint cars,
and endurance applications, up to 8,200 RPM. Proven performance and reliability.
Recommended lash is .020”, allowing for a tight cold setting on aluminum engines.
R-244/420 276 .0200 166 .105 .070 .630 .672 .714 .739 B
R-246/420 278 .0200 169 .109 .073 .630 .672 .714 .739 B
R-248/420 280 .0200 169 .113 .081 .630 .672 .714 .739 A B
R-252/420 284 .0200 173 .121 .087 .630 .672 .714 .739 A B
R-256/420 288 .0200 176 .129 .094 .630 .672 .714 .739 A B
R-258/420 290 .0200 178 .133 .098 .630 .672 .714 .739 B
R-260/420 292 .0200 180 .137 .101 .630 .672 .714 .739 A B
R-262/420 294 .0200 182 .141 .105 .630 .672 .714 .739 B G
R-264/420 296 .0200 183 .145 .109 .630 .672 .714 .739 A B G
R-266/420 298 .0200 185 .150 .113 .630 .672 .714 .739 B
R-268/420 300 .0200 187 .154 .116 .630 .672 .714 .739 A B F
R-270/420 302 .0200 189 .158 .120 .630 .672 .714 .739 B
R-272/420 304 .0200 191 .162 .124 .630 .672 .714 .739 A B
R-274/420 306 .0200 193 .166 .128 .630 .672 .714 .739 B
R-276/420 308 .0200 195 .170 .132 .630 .672 .714 .739 A B
R-278/420 310 .0200 196 .174 .136 .630 .672 .714 .739 B
R-280/420 312 .0200 198 .178 .140 .630 .672 .714 .739 B
R-282/420 314 .0200 200 .182 .145 .630 .672 .714 .739 B
R-284/420 316 .0200 202 .186 .147 .630 .672 .714 .739 B
R-286/420 318 .0200 202 .190 .149 .630 .672 .714 .739 B
R-290/420 322 .0200 203 .198 .154 .630 .672 .714 .739 B
438
438 roller series created as a step up from the 420 series with improved
high-RPM dynamics. Recommended lash is .016" intake and .018" exhaust.
R-236/438 266 .0200 160 .094 .061 .657 .701 .745 .771 B
R-240/438 270 .0200 164 .102 .067 .657 .701 .745 .771 B
R-246/438 276 .0200 169 .113 .076 .657 .701 .745 .771 B F
R-250/438 280 .0200 173 .121 .083 .657 .701 .745 .771 B F
R-258/438 290 .0200 178 .129 .098 .657 .701 .745 .771 C
R-262/438 294 .0200 181 .137 .105 .657 .701 .745 .771 C
R-264/438 296 .0200 183 .141 .110 .657 .701 .745 .771 C
R-268/438 300 .0200 187 .150 .117 .657 .701 .745 .771 F
R-272/438 304 .0200 191 .163 .121 .657 .701 .745 .771 C F
R-274/438 306 .0200 193 .167 .125 .657 .701 .745 .771 C
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