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wedgie
Samba Member
Joined: October 06, 2009
Posts: 51
Location: New Zealand
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 Posted: Fri May 25, 2012 1:20 pm Post subject: |
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| Thanks for that. What constitutes a 'competition valve job' please? (excuse my ignorance!) |
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Matthew
Samba Member
Joined: January 29, 2004
Posts: 1760
Location: Eastern Tennessee
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| Posted: Sat May 26, 2012 5:33 am Post subject: |
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Competition valve job would be multi angles cut on the valve seat and valve face. They range from 3 - 5 angles. Bill Fisher's book explains it pretty well. A google search for 3 angle valve job should yield some photos.
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1965 Beetle sedan
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wedgie
Samba Member
Joined: October 06, 2009
Posts: 51
Location: New Zealand
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| Posted: Tue May 29, 2012 12:11 am Post subject: |
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| Thanks for that, much appreciated! |
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chizucc
Samba Member
Joined: August 16, 2012
Posts: 281
Location: Los Angeles
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| Posted: Wed Feb 27, 2013 11:33 am Post subject: |
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| Dangermouse wrote: |
The advice I was given was that - The "evil" H cases are the `68/`69 H5 Type I (and their B5 bus-motor brethren, as well as the contemporary Type III cases). H0 (1967 1500 Type I and II) were not cast from the same cottage-cheese alloy, nor were any `70-up cases. The US-market engines had to meet tighter emissions specs which meant higher operating temperatures, and the less-dense alloy was employed in order to improve heat transfer through the case - turned out to be a very bad idea, the softer alloy was much more prone to cracking/warping and pulled head studs. For `70, the oiling system was improved, allowing the use of the stronger AS41 alloy.
In the US market there were no H1 cases. The last `67 case here was something like H0874199, then the H5 came in. But in other countries the H0 series continued until they ran out of numbers in mid`68 and went on from H1000000. My H1259065 is of late`69 vintage (non-US, obviously); the large oil passages and dual-relief setup indicate that it's comparable to the B6 1600SP sold in the US in 1970. |
Has anyone seen a H0 case for a Type 3 before?
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1964 Notchback
http://www.thesamba.com/vw/forum/viewtopic.php?t=543579 |
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