Quote:
Originally Posted by blykins
David,
You can run solid lifters on a hydraulic cam, but you can't run hydraulic lifters on a solid cam. The ramps are too steep and you would end up losing control of the valve train.
If you look at a hydraulic roller camshaft, there is a big difference between durations at seat and durations at .050"....usually around 50-60°. On a solid roller, you get differences around 30-40° depending on the lobe. The solid roller cam would be lofting the lifters sure as the world. Hydraulic roller lifters are very heavy, and SBF valvetrain isn't the lightest in the world either.
If you want a nice, smooth solid roller grind, you can go to their "street roller" section. The ramps are smoother, so you can get longer life out of your springs and lifters. If you want an extremely aggressive lobe for a race car, you can use their "TK" lobes. However, your springs and lifters will call you names behind your back.
I use Comp Cams quite a bit for street/stock builds, and I also use Mike Jones for a completely custom grind. I am a distributor for him and have used his cams in my own engines. He says that his grinds are 20-30 hp over comparable Comp grinds.
BTW, how much lash are you running?
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Brent; my cam is a comp cam, solid roller, the cam card is in the shop some where right now, but the lift is 586 and the duration is 288, same for intake/exhaust, using comp solid roller lifters with the horizontal tie bar (no hold down spider thingy needed).... lash is set cold @ .020 I/E ar per the cam card, so it my spring pressure, all done by the cam card specs... I like the cam, lots of low end grunt and hp peaked at 6,200 rpms on the dyno... both torque and hp curve were very flat thru the rpm range and the 331 made 472 hp and 440 ft lbs of torque, using a 3rd hand set of Edlebrock RPM Performer heads and a Victor Jr. intake with a stock 650 DP Demon carb and a restirctive set of headers (not much choice of headers for a 65 Mustang)... I just find at idle, it's "noisy" under the valve covers......
Now that the motor is out and in pieces (literally, pics later) I'm gonna build a another 331 and was planing a little more cam, keeping everything else pretty much the same..... Probably will go with a hydraulic roller this time if I can get the grind I'm looking for, although I can't really complain about my solid roller, I only pull the valve covers once a year to check the valves and rarely had to adjust them very much. I shift it at 6,000 rpms and have a 7,000 chip in the MSD box.. most road courses I run, I occasionaly see 6,500 rpms on the straight and every now and then run it up to 7,000rpms, but for the most part, you could say my max rpm 95% of the time is 6,500.........
My original thoughts were to re-use my cam, with hydraulic roller lifters, but as you say, it will not work, so I'll probably go with a hydraulic roller cam......
I'm not looking for a ground pounding killer motor, but would like something from 475 up to 500 hp for the new motor....
my old motor has served me well for almost 4 full race seasons, so I can't complain.....
Once I figure out how to ad d pics again, I'll start a new thread with the details of my motor failure and then the folks can analyze the bottom end failure!!!!!!!!!!!!
David
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