flat cams

mlearn · Post by **mlearn** » Mon Jun 30, 2003 10:34 pm

You talked about using roller cam spring pressures on flat cams. Don't the winston cup cams have a hardened overlay? Also, what is the typical lobe separation used?

Thanks

speedtalk · Post by **speedtalk** » Tue Jul 01, 2003 10:45 am

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

Guest · Post by **Guest** » Tue Jul 01, 2003 8:59 pm

So people are running the big springs with the schubeck's on standard cores. I build a 427 for a guys boat and was trying to get him to run the radius lifters(i've never used them) on a mushroom lobe since he is restricted to a flat cam but he wouldn't spend the money.

Thanks

speedtalk · Post by **speedtalk** » Tue Jul 01, 2003 9:45 pm

I have zero experience with the radius solid lifters, but I'm 100% sure they don't work with a mushroom lobe design - they're meant to work with a roller lobe. Let me know what you find out. Thanks, Don

mlearn · Post by **mlearn** » Tue Jul 01, 2003 11:41 pm

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?

speedtalk · Post by **speedtalk** » Wed Jul 02, 2003 11:39 am

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.

mlearn · Post by **mlearn** » Wed Jul 02, 2003 8:45 pm

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

speedtalk · Post by **speedtalk** » Thu Jul 03, 2003 12:26 am

Don't let anyone talk you out of trying something. Send me a private message if you don't want to post your idea on the board. You may need to register on the board to do this. Thanks, Don

Guest · Post by **Guest** » Wed Feb 18, 2004 10:45 pm

cstraub, being a valve train specialist, i don't suppose you could tell me how to calculate the surface area of a convex surface, namely a lifter.

Thanks

learner · Post by **learner** » Thu Feb 19, 2004 10:23 am

Thanks, i would really appreciate that. I've been after that for some time.

Shaun Tiede/UltraDyne · Fri Mar 12, 2004 12:42 pm

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.

SW · Post by SW » Mon Mar 15, 2004 9:19 pm

Has anyone of you tried the Casidium product on lifters or cams?I know that the wrist pin coating fixed all the galling problems that we had.It seems to me that it would work equally as well on lifters and cams, too.
Shawn

speedtalk · Post by **speedtalk** » Mon Mar 15, 2004 10:50 pm

SW wrote:Has anyone of you tried the Casidium product on lifters or cams?

I know of a cup team using it there.

Don Terrill’s Speed-Talk

flat cams

flat cams

Flat Cams