Author |
Message |
Ofir Samba Member
Joined: September 26, 2005 Posts: 460 Location: Israel
|
Posted: Wed Apr 01, 2009 12:01 am Post subject: NOS camshaft with timing gear + 5 |
|
|
Hello all,
NOS camshaft with timing gear + 5 will fit any stock engine normally ?
I want to built brand new engine myself ,all parts are brand new NOS , crankshaft NOS , engine case , and so on & on...
My question is : is this camshaft with timing gear + 5 , will fit to the engine without any problem ?
What's the meaning of +5 , comparing to camshaft with timing gear -0- ?
Thanks for you help
Ofir |
|
Back to top |
|
|
1961bluebug Samba Member
Joined: November 11, 2002 Posts: 1137 Location: Czech Republic, Europe
|
Posted: Wed Apr 01, 2009 1:53 am Post subject: |
|
|
All depends on how the case is machined. You will find out from the cam gear backlash when you do the first mockup. |
|
Back to top |
|
|
Ofir Samba Member
Joined: September 26, 2005 Posts: 460 Location: Israel
|
Posted: Wed Apr 01, 2009 2:04 am Post subject: |
|
|
The case is brand new , the crankshaft is brand new , bearing size standard , standard ,
What's the meaning of +5 ?
Thanks |
|
Back to top |
|
|
Marv [UK] Samba Member
Joined: January 07, 2009 Posts: 2225 Location: UK
|
Posted: Wed Apr 01, 2009 3:10 am Post subject: |
|
|
Ofir wrote: |
The case is brand new , the crankshaft is brand new , bearing size standard , standard ,
What's the meaning of +5 ?
Thanks |
to account for small tolerance differences in cases depending on moulds and subsequent rebuild machine work, VW manufactured cam gears in various sizes.
to my knowledge, which is not borne from experience in this particular field, VW manufactured the sets ranging from -3 to +3 to allow gear lash to be set correctly without worrying about case tolerances.
0 is abviously the theoretical size of the cam gears, if the centre line of the cam and crank is further apart than the theoretical dimension, then a + set is required. the degree of plusness depends on the dimension.
As for the exact size of the graduations, i'm not sure. Someone will come along shortly to fill in the blanks, or tell me I talking complete bollocks, but either way, until you fit it and measure your gear lash, there is no way to tell if it's the holy grail or not |
|
Back to top |
|
|
ALB Samba Member
Joined: August 05, 2008 Posts: 3483 Location: beautiful suburban Wet Coast of Canada
|
Posted: Wed Apr 01, 2009 5:23 am Post subject: |
|
|
Paraphrased from Gene Berg:" VW made "0" to plus 7 and minus 7 (15 sizes). When the factory sets up the align bore machines there will always be deviation on the center to center distance from crank to cam. Often just the temperature of the machine that bores the holes can change that distance. The gears aren't different sizes; the pitch angle is deviated to make the different fits. The object is to have the fit as close as possible without backlash, yet not create a load against the bearing diameter."
I've seen to minus 5. Hope this helps. Al _________________ On a lifelong mission to prove (much to my wife's dismay) that Immaturity is Forever!! |
|
Back to top |
|
|
Marv [UK] Samba Member
Joined: January 07, 2009 Posts: 2225 Location: UK
|
Posted: Wed Apr 01, 2009 5:28 am Post subject: |
|
|
ALB wrote: |
Paraphrased from Gene Berg:" VW made "0" to plus 7 and minus 7 (15 sizes). |
see, i knew i'd get something wrong |
|
Back to top |
|
|
ALB Samba Member
Joined: August 05, 2008 Posts: 3483 Location: beautiful suburban Wet Coast of Canada
|
Posted: Wed Apr 01, 2009 5:39 am Post subject: |
|
|
Marv [UK] wrote: |
ALB wrote: |
Paraphrased from Gene Berg:" VW made "0" to plus 7 and minus 7 (15 sizes). |
see, i knew i'd get something wrong |
You didn't have all the info, but as usual you have a good understanding of the situation. _________________ On a lifelong mission to prove (much to my wife's dismay) that Immaturity is Forever!! |
|
Back to top |
|
|
Type 5 Joe Banned
Joined: January 18, 2003 Posts: 1795 Location: Oregon
|
Posted: Wed Apr 01, 2009 6:15 am Post subject: |
|
|
The pitch diameter is different, not the pitch angle.
You do want a small amount of back-lash.... check it at 3-4 places as you rotate the gears around. |
|
Back to top |
|
|
|