NASCAR cams?

bc · Post by bc » Sun Jun 19, 2005 4:39 pm

Does anyone know what kind of cam lift the NASCAR guys are running?

highVE · Post by **highVE** » Sun Jun 19, 2005 9:14 pm

To my knowlege, (not being a winston cup engine builder) they are running a net valve lift of around .660-.690 on the un-restricted engines. and i believe that's with a 1.75 or a 1.8 rocker. keep in mind(as of a few years ago) they are still using flat tappet camshafts. i'm pretty sure they still are too.

Robert Kane · Post by **Robert Kane** » Sun Jun 19, 2005 11:54 pm

A flat tappet camshaft is limited in lobe lift by the diameter of the tappet. The larger the tappet base (i/e mushroom) the bigger the lobe/base circle cam be until the limiting factor becomes the cam journal size. The bigger the bearing diameter, the higher the lobes can go, and the larger the base circle can be. Lobe lift can not exceed 1/2 tappet diameter or edge contact cam occur and the cam lobes don't like that.
Robert

Joe Mendelis · Post by **Joe Mendelis** » Mon Jun 20, 2005 9:19 pm

NASCAR? If you mean flat tappet Cup stuff it is over .800 and they run over 2.0 for rockers.

idunno · Post by **idunno** » Tue Jun 21, 2005 4:42 pm

they are using roller billet cams that are modified for use with solid flat tappet tool steel lifters. Nothing stock about them. THey use to grind a groove in the center of the lobe and weld Nickel into it.Now I think they are using a new billet material with a different Heat treating process that eliminates the welding. Im kinda outdated on the new Nextell Cup motors.

SStrokerAce · Post by **SStrokerAce** » Wed Jun 22, 2005 12:05 am

idunno wrote:they are using roller billet cams that are modified for use with solid flat tappet tool steel lifters. Nothing stock about them. THey use to grind a groove in the center of the lobe and weld Nickel into it.Now I think they are using a new billet material with a different Heat treating process that eliminates the welding. Im kinda outdated on the new Nextell Cup motors.

lol.... not that far outdated if you know that.

From what I have heard you are pretty close, the particulars of how and what they are using are interesting.

Bret

Jay Allen · Post by **Jay Allen** » Thu Jun 23, 2005 3:23 pm

.420" lobe lift to .440" lobe lift with 1.8 - 1.9 - 2.0 rockers.

Billet cores. CNC ground.

SStrokerAce · Post by **SStrokerAce** » Fri Jun 24, 2005 8:41 pm

Jay Allen wrote:.420" lobe lift to .440" lobe lift with 1.8 - 1.9 - 2.0 rockers.

Billet cores. CNC ground.

Not what I hear on the flat tappet stuff Jay... they still have the old machines doing the work with the guys who know how to do it.

Bret

RJ · Post by RJ » Sun Jul 03, 2005 11:56 am

Jay is real close.

larrycoyle · Post by **larrycoyle** » Fri Jul 08, 2005 6:03 pm

They also used to do this same treatment to the fuel car cams in the old days. The general term for it is hard face overlay.

Larry

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NASCAR cams?

NASCAR cams?

nascar cams

Nascar Cams