The lash pads are the part of the rocker arm that the camshaft actually presses on. THey are replaceable and often wear down after 100,000's of kms. By changning the base circle of the cam you are changing the part of the lash pad that it wipes, hence often needing new ones
Chris Kristian Walsham writes: > Thanks Errol, > Silly question, but where do the lash pads go? I thought they only had >pivot points/ rocker arms. I couldn`t see any lash pads in workshop manuals. > > Kris. > ----- Original Message ----- > From: E Smith > To: [EMAIL PROTECTED] > Sent: Tuesday, May 21, 2002 12:27 PM > Subject: RE: valve train geometry > > > Valve train geometry is a broad term used to describe the changing relationship >between rocker arm angle in relation to the valve stem motion. > > In the L series its main relevance is the position of the wipe of the cam lobe on >the rocker pad. > > The standard geometry ensure that the wipe is in the middle of the pad. When a >regrind (non billet) cam is used the cam grinder takes meat of the base circle of the >cam to get more lift, change duration and lift ramp angles. Regrinds require the use >of thicker lash pads to correct the change of rocker angle. The increase in lash pad >thickness = amount removed from base circle of cam times 1.5 (for rocker arm ratio). >Eg 2 mm of cam base requires a 3 mm thicker lash pad. > > The rocker geometry also has an effect on the valve stem as well. If the angle is >not brought back to design specs the rocker tends to pull the stem against the guide >causing premature guide wear. > > My 2 cents worth. > > Cheers > > Feral Errol > > > > -----Original Message----- > From: [EMAIL PROTECTED] >[mailto:[EMAIL PROTECTED]]On Behalf Of Kristian Walsham > Sent: Tuesday, 21 May 2002 10:35 AM > To: [EMAIL PROTECTED] > Subject: valve train geometry > > > > Hi all, > > Can anyone please explain what is meant by valvetrain geometry in the L >series. I have a basic idea but i`m lost when it comes to checking it to see if it is >correct and how it is corrected. > > > > Thanks, > > Kris. > > > > Plenty of explanations welcome!! > > > --membersozdat------------------------------------------------------- > OZDAT Mailing List Please Note:- > Send (un)subscribe requests to [EMAIL PROTECTED] > Send submissions to [EMAIL PROTECTED] > No unauthorised redistribution of this email > http://www.ozdat.com/ozdatonline/index.htm > http://www.ozdat.com/ozdatonline/listindex.html > http://www.mail-archive.com/[email protected]/ > --------------------------------------------------------------------- > --membersozdat------------------------------------------------------- > OZDAT Mailing List Please Note:- > Send (un)subscribe requests to [EMAIL PROTECTED] > Send submissions to [EMAIL PROTECTED] > No unauthorised redistribution of this email > http://www.ozdat.com/ozdatonline/index.htm > http://www.ozdat.com/ozdatonline/listindex.html > http://www.mail-archive.com/[email protected]/ > --------------------------------------------------------------------- > --membersozdat------------------------------------------------------- OZDAT Mailing List Please Note:- Send (un)subscribe requests to [EMAIL PROTECTED] Send submissions to [EMAIL PROTECTED] No unauthorised redistribution of this email http://www.ozdat.com/ozdatonline/index.htm http://www.ozdat.com/ozdatonline/listindex.html http://www.mail-archive.com/[email protected]/ ---------------------------------------------------------------------
