[6pack] Measuring valve lift

[Navarrette, Vance]

 	Joe:

	There are many ways to do this, you need to find one that works for you. Here
are some ways that will work, depending on the motor, rocker arm size, etc.

	The problem with both the adjuster and the rocker tip is that the rocker
sweeps through an arc, and so getting an accurate measurement is a problem, as
you have discovered.

	To measure the lobe lift, loosen up the adjuster until you can push the
rocker out of the way, then put your dial indicator tip in the push rod cup.
It is important that the pushrod not touch the cylinder head at any point
during the measurement - otherwise the measurement will be inaccurate.

	To measure the valve lift leave the arm in place, and put the dial indicator
tip on the valve spring retainer (anywhere will do). You can compute the lobe
lift using this value, but it is less accurate by virtue of the relatively
wide tolerances on rocker arm ratio.


    Vance Navarrette
    Cogito Ergo Zoom
    I think, therefore I go fast

-----Original Message-----
From: 6pack-bounces at autox.team.net [mailto:6pack-bounces at autox.team.net] On
Behalf Of Joe Santamaria
Sent: Wednesday, May 13, 2009 4:41 AM
To: 6pack at autox.team.net
Subject: [6pack] Measuring valve lift

Hi guys,

I am a regular member of the list for some years now and excuse me as I
don't have a TR6 but have five Saloons all with 2500 PI engines, one with a
TR6 cam, so I find all the content on engines on this list most helpful but
can't participate as much on the TR 6 per se. I'd love to have a TR6 but
unfortunately out of budget at this stage.

I do have a question though, on how to correctly measure valve lift with cam
and rockers in place.

<snip>

Cheers

Joe.