[Chrysler300] lifters/cam

["George Riehl" <longrams@xxxxxxxxxxxxx>]

There is a difference between hyd. cams/lifters and solid cams/lifters.  The cam lobe profile is different between the two. The solid cam has a different profile at the tip of the lobe, it is "flatter"  than the hyd. lobe.  There is a difference in the "up" ramp and "down" ramp between the two cams.  The solid cam tends to hold the valve open longer than the hyd. lobe. The hyd. cam "lifts" the valve higher about the same. It is all about "flow". Then there is the "degree" factor and lobe seperation.......etc, etc. 
The idea between the two is duration of the valve open. In the solid cam, the valve is held open but not as high as a hyd. This factor determines the valve spring compression factor. It is a formula about geometry. 
Standard hyd. lifters tend to "pump up" at higher R.P.Ms. There are lifters that are of "bleed down" "anti-pump up" type for the higher perf. cams. That is another whole different formula. Then there is the "roller cams" with roller lifters....another different formula. 
The two main differences in solid lifters is this....there are two types. One is a bacically standard solid lifter, then there is a solid lifter that looks like an "hour glass". This is if the "lighter" type. This is used on a higher R.P.M. engine to reduce "mass" weight on the valve train. Then going a little further, the pushrods are of two type. Standard as comes from the factory, or the "molly" type that is of much higher strength. These usually are used with higher lift assemblies for serious racing and to reduce "mass' weight along with stronger compressive valve springs handeling lifts above .500 -.750+ making sure the valves return to their seats, hopefully.
Camshafts, valves, springs, lifters and timing chain degreeing is like figuring "quantum formulas".  Any one of them will work as to what power plant is being built. Discussion can go like....which came first, the chicken or the egg. Is the galss "half" full or "half" empty.  Choose one, if it doesn't work, change again, then, maybe, change again. Have fun! Just make sure the rods and pistons stay inside the block! It only costs money!
    George     



     

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