braveops Posted January 21, 2014 Author Report Share Posted January 21, 2014 does anyone know the specs of the m651 and who made them?? Quote Link to comment
Sealik Posted January 21, 2014 Report Share Posted January 21, 2014 "The cam is a M651 shadbolt grind (.488 lift 296dur. 76 overlap) and has a powerband of 3500-7000. This, on a daily driver, might be a bit "peaky" but for the use I put my car to it work well". http://www.datsun510.com/bbmail/1998/0086.html Quote Link to comment
Sealik Posted January 21, 2014 Report Share Posted January 21, 2014 Shadbolt and Colt both marked the end of the cam with the designation. As for the specs lets see:445 Profile: Duration: 280 degrees (30-70-70-30) Overlap: 60 degrees Lift: 0.507” at the valve "Good for about 7200 rpm max" Works well with Roadster valve springs 449 Profile: Duration: 256 degrees Overlap: xx degrees Lift: 0.492” at the valve "...?..." 651 Profile: Duration: 296 degrees (38-78-78-38) Overlap: 76 degrees Lift: 0.487” at the valve "I never liked the #651, because it's numerically almost identical to a worn out 445 with it's lobe tip worn off, so pick either a #445 or a #780 instead" - G.B. from Colt Cams 780 Profile: The Datsun Radial Challenge Cam (DRC) Duration: 304 degrees (44-80-80-44) Overlap: 88 degrees Lift: 0.522” at the valve "Should be good for more than 8000 rpm easily" Cam oiling spray bar should be used, along with some serious valve springs 721 Profile: (purported to be a copy of Racer-Brown #391-R, pg. 54 of the later Steve Smith book.) 306 degrees duration (45-81-81-45) Overlap: 90 degrees! (yeowch!, that's racy!) Lift: 0.582” at the valve Cam oiling spray bar MUST be used, along with max effort valve springs, and maybe even lightweight spring retainters TURBO 445I-9E Profile: Ground as #445 on the intake, and #449 on the exhaust Intake = 280 degrees @ .507 lift Exhaust = 256 degrees @ .492 lift Total Overlap : 48 degrees (VERY low overlap) Lash: 0.008” Intake, 0.012” Exhaust "...has very low overlap, early exhaust opening and intake closing..."http://community.ratsun.net/topic/20699-shadbolt-cam/ .................................................................................. I'm running the M449 1 Quote Link to comment
braveops Posted January 21, 2014 Author Report Share Posted January 21, 2014 thanx where did you find the info on the cams? nevermind i just seen the link under your post from my old post i forgot about i forgot to ask about the blue stripe springs any idea what they are? Quote Link to comment
Sealik Posted January 21, 2014 Report Share Posted January 21, 2014 I think Comp Cam springs have that blue stripe....?..... Quote Link to comment
braveops Posted January 22, 2014 Author Report Share Posted January 22, 2014 i remeasured today and got 467-470 so this is a bit better Quote Link to comment
braveops Posted February 14, 2014 Author Report Share Posted February 14, 2014 Shadbolt and Colt both marked the end of the cam with the designation. As for the specs lets see: 445 Profile: Duration: 280 degrees (30-70-70-30) Overlap: 60 degrees Lift: 0.507” at the valve "Good for about 7200 rpm max" Works well with Roadster valve springs 449 Profile: Duration: 256 degrees Overlap: xx degrees Lift: 0.492” at the valve "...?..." 651 Profile: Duration: 296 degrees (38-78-78-38) Overlap: 76 degrees Lift: 0.487” at the valve "I never liked the #651, because it's numerically almost identical to a worn out 445 with it's lobe tip worn off, so pick either a #445 or a #780 instead" - G.B. from Colt Cams http://community.ratsun.net/topic/20699-shadbolt-cam/ .................................................................................. I'm running the M449 how do you like the m449 cam? how does it sound does it have a lumpy idle to it Quote Link to comment
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