flat cams
Moderator: Team
Winston Cup flat tappet cam cores have a large groove cut right through the middle of the lobe, the groove is welded closed and then the cam is ground. I'm not sure what the weld material is, but it's very hard. People are having good luck with the http://www.schubeckracing.com lifter on standard cores. Thanks, Don
As far as radius lifters not working on a mushroom lobe are you referring to the difference in core materials? Other than timing differences with a radius lifter compared to a flat lifter i figured that if a radius lifter would follow a roller lobe that it would follow a mushroom lobe. I had talked to Joe Schubeck about that and he was wanting to grind up his own cam that would be more aggressive than a mushroom lobe but not look like a roller. I was concerned that it would look too much like a roller to not pass tech but since the guy didn't want to spend the money i guess it doesn't matter anyway. Maybe in the future.
Thanks
P.S. Are you still working for someone or doing your own thing?
Thanks
P.S. Are you still working for someone or doing your own thing?
Sorry I didn't explain in my last post. Lobes need to be designed with the follower in mind. A roller lifter on a flat tappet design will make for very lazy valve motion. A flat lifter on a roller design would make for explosive motion and would destroy itself in seconds - that is if it would even turn over. I understand what you want to do, but there's no way to make more power by using a radius lifter on a lobe that looks more like a flat tappet lobe. I'd just focus on creating the best valve motion with a flat design - rocker ratio is your friend Me? They couldn't pay me enough (they've tried) to go back to a big team. 99% of team members have no desire to win races, they just want to protect their jobs and collect a paycheck. Life is too short for that nonsense.
Yes, i can see that the radius lifter having a 1" radius compared to the normal radius of about 30" on a flat lifter would translate into a very slow valve opening and closing. I know that the maximum acceleration rates of roller lobes are based on the radius of the roller on the lifter. In that case a 1" radius lifter needs a roller style lobe to be used effectively. I do have some other ideas but do not wish to disclose them to all the readers, besides i was told that it would most likely be a waste of time. Things like that don't stop me though when i'm out to get as much of an advantage as i can.
Thanks
Thanks
Flat Cams
What about lifter bore truing the block and running .904 tappets in the block? I have great .904 designs. The other thing you can do is run the .875 tappets. I also have great .875 designs. It sure would be cheaper since you can use a standard Ford or Mopar lifter.