Lancia Motor Club Forum Banner
28 March, 2024, 11:48:05 AM *
Welcome, Guest. Please login or register.

Login with username, password and session length
News: Need to contact the Forum Administrator? e-mail forum.admin@lanciamc.co.uk, for Database Administrator e-mail database.admin@lanciamc.co.uk      -      Copy deadline for Viva Lancia is 12th of each month.      -      For Events e-mail events@lanciamc.co.uk      -      To Join the club go to http://www.lanciamc.co.uk/join.htm
 
   Home   Help Search Calendar Register  
Pages: [1]   Go Down
  Print  
Author Topic: cam timing  (Read 4266 times)
0 Members and 1 Guest are viewing this topic.
dhla40
Senior Member
*****
Posts: 174


« on: 16 August, 2009, 09:49:39 AM »

Is it possible to adjust non vernier cams and if so how is this acheived?  My manual only shows the procedure for vernier cams.  My intake cam timing looks to be late by about 8 degrees, is this worth mucking about with?

Sean
Logged

1976 1.3s coupe
1973 1.3s coupe
1982 montecarlo project
1976 alfa GT
1981 alfa spider
Richard Fridd
Permanent resident
**
Posts: 3430



« Reply #1 on: 16 August, 2009, 11:35:51 AM »

if only one camshaft is late perhaps it is wrongly set by an amount which represents one tooth of the timing chain.if both are incorrect perhaps the wrong timing mark on the flywheel has been used for the valve timing.as far as i know there is no fine adjustment without verniercams.if you do change to these i think you need to use early s2 vernier wheels to suit your chain.richard
Logged

Richard Nevison Fridd                                                                      Happy Lancia, Happy Life
dhla40
Senior Member
*****
Posts: 174


« Reply #2 on: 16 August, 2009, 04:35:05 PM »

Judging by eye one tooth seems to equate to 10 degrees on the flywheel so I might jump it forward, any idea how far the cam can be advanced before valves start hitting pistons Shocked

Sean
Logged

1976 1.3s coupe
1973 1.3s coupe
1982 montecarlo project
1976 alfa GT
1981 alfa spider
Neil Lewis
Guest
« Reply #3 on: 16 August, 2009, 04:55:13 PM »

Be very careful because even if you can't discern any valve to piston contact while turning the engine over by had, once started the pistons will come up higher and the valves down lower due to stretch of con rods etc.  So, if your valves were JUST missing the pistons by hand, you might hear teh ineitable tapping once the engine is running.

It is possible to time the later engines using teh earlier multi-hole sprockets.  It took me several hours of frustration in my shed but eventually I got it spot on.  Because the peg is fixed in the cams you have to split the chain and, while holding the cams in one place, move the sprockets around one hole at a time.  Reconnect the chain and check the valve timing and keep doing that until you get as close as you can get.  Mark the holes in the sprockets (I think there are thirteen) and make copious notes as you go so, when you get back to the first hole, you can choose which was the best hole to use.  Tedious in the extreme but it does work!!!

If you can't find multi-hole sprockets it is possible to drill your own holes if you have access to a fancy machine tool drill which can be moved around the correct amount of degrees for each hole.  A machine shop should be able to do that for you, but they may not want to!

Neil
Logged
Pages: [1]   Go Up
  Print  
 
Jump to:  

Contact the Forum Administrator

LMC Forum copyright © 2007 - 2021 Lancia Motor Club Ltd

Powered by SMF 1.1.20 | SMF © 2006-2011, Simple Machines
Page created in 0.044 seconds with 21 queries.