wayfarer Posted April 25, 2015 Report Posted April 25, 2015 Anyone have either or both cams laying loose? Can you provide and overall measurement for one or both? Many thanks!! Quote
_shel_ny Posted April 25, 2015 Report Posted April 25, 2015 (edited) I measure the 230 cam right at 25- 1/4" Edited April 25, 2015 by shel_ny Quote
wayfarer Posted April 25, 2015 Author Report Posted April 25, 2015 Thanks shel_ny ! Just a bit curious about the cam in the pic with those pointy lobes. What is lift and duration? Quote
Plymouthy Adams Posted April 25, 2015 Report Posted April 25, 2015 looks like fuel pump lobe... Quote
_shel_ny Posted April 25, 2015 Report Posted April 25, 2015 Thanks shel_ny ! Just a bit curious about the cam in the pic with those pointy lobes. What is lift and duration? To the best of my knowledge it is a stock cam. It was pulled from a D42, 230. All's I know. Oddly enough the part # is for a '53 Dodge. At least according to my parts book. It has 12 of those pointy lobes, and shown with them 1 off center, pretty much round, 1- 1/2" "lobe" for the fuel pump. Quote
wayfarer Posted April 25, 2015 Author Report Posted April 25, 2015 Wow... with that shape of ramp the valve must literally slam shut. Quote
BobK Posted April 26, 2015 Report Posted April 26, 2015 I'm no cam profile expert, but I would think that having mushroom lifters affects the cam lobe profile. Quote
Dodgeb4ya Posted April 26, 2015 Report Posted April 26, 2015 Those lobes look like all stock flathead six cam lobes... all sharp... . lttle duration. Quote
BobK Posted April 27, 2015 Report Posted April 27, 2015 While the cam itself may have little duration, with mushroom lifters with their large diameter bases, those sharp, pointed lobes are in contact with the lifter longer (compared to non mushroom lifters). I would think this would affect the actual valve lift duration. Plymouthy Adams...... what say you? Quote
Plymouthy Adams Posted April 27, 2015 Report Posted April 27, 2015 I have never really studied the mushroom lifter...but by looking. the large lifter base will allow for more aggressive cam profiles due to the longer contact time it shares with the cam lobe..the duration however is still product of the ramp opening and closing time..lift and duration at max lift is the reason for the mushroom use and the flatter ramps ensure a non slamming operation..again decelerated due to longer contact...and as I see it, another reason that these engine do not run high rate springs...wear would be greatly increased as the spring tension is increased.. Quote
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