Spring seat pressure?

[388dart]

What are the downsides of having too much seat pressure with a hydraulic cam?
Is 160#s too high for seat pressure running a hydraulic cam?
thanks

 

[TeamDart]

Down sides is flattening a lobe. On a new hydraulic cam I would not run 160lbs on the seat unless the manufacture calls for it.... The highest I have ran is 160lbs on the seat on a comp cam.... but started off with 110lbs, then after some break in went to 160lbs....

Tony

 

[moper]

Who's calling for that much spring? The heaviest I've used are duals that have a seat pressure of 130 pounds. But it's got 380 over the nose. That's a rough spring for a very fast rate .904 lifter type lobe. Or is this a solid cma motor getting de-cammed? You may try testing a couple if that's the case. They may be a little weaker.

 

[lenweiler]

Better too much than not enough. That being said, 160# does sound excessive. My 451 street car was plugged in around 130#'s, but I've noticed that the engine flatlines after 5600 r's. Used to pull to 6500. I'm assuming the 16 year old springs are tired by now. Thus, the valve float.

 

[ramcharger]

Too much spring on a hydraulic cam will bleed the lifters down and make them noisy and reduce your valve lift not to mention flatten your lobes. What's the pressure over the nose?