SFfriedog!?? who the hell is that
Actually, that sounds pretty good... friedogs for dinner!!;-)
Stock engines like 5.0 Fords anf LS1 Chevys don't count because the lobes are REAL mild and usually have valve spring seat pressures of under 100 lbs.
Which brings me to the next point. Roller cams make big horespower when ground to race specs.
If you grind a roller cam with valve lifts, lobe centers and ramp designs designed to work in a street engine (like under .650 lift and 260 degrees duration for example) you are still in the reality range of a flat tappet cam. Will the roller make more power? Yes, definately. but not a bunch more power. In a race engine, where all the advantages of a roller cam can be utilized in cam design, they will make a bunch more power.
Also, as far as lifter oiling is concerned, It totally depends on what block you are using. A pre-67 side oiler block has no provisions for lifter oiling no matter what lifter you use. Shelby blocks don't have this problem. The only roller lifter that I have seen that has a dedicated pressure oiling system for the roller needle bearings are made by Jesel and are around $1800 a set.
The other lifters have slots in the side of the lifter body that allow the needles to get oil, if you have pressure fed lifter galleys.
THings are better now than ever for running a roller on the street, but they still have drawbacks for most users.
I have used the Danny Bee Belt drive on a small block and on a 460 and it is awsome. I really like the idler/tensioner that most other belts don't have. The belt is at least twice as wide as the other manufactures and will last a long time.
--Mike
Quote:
Originally posted by RICK LAKE
SFriedog Roller lifters have become a common thing in the LS1 or any pushrod engine still being made. Roller do break and put bearings all over the motor, if you are luck the oil pump will pick them up and only break the pump or gear for the drive. You have alot of motor out there with lifts of .650" and more. This is what is killing these motors, not the roller setup. A custom cam with a lft of 600" should have no problem with the problems you refer to. I call crane and got a custom number with 565"-583" with 110 lobe seperation. Great tork cam with good Hp. You have a Danny bee timing set on one of your motors? In the beginning timing belts where breaking and not INSTALLED right causing damage to motors. Now most overhead cam motors run them and turn 9000 rpm with no problems. The belts last 75,000 miles. I am going with a Danny bee timing set on my new motor. Put the right parts togeather and set right, there should be any problems. 1 other point the roller cam and flat tappet have 2 different design lobes. There is alot more friction on the flat than the roller, roller also oils the cam lobe and wheel, flat tappets rely on oils splash. I would perfer anyway 600 of tork to 600 hp.  Rick Lake
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