[T3] [T-3] CAM GEAR SELECTION/MATYCHING , GOOD INFO FOUND

["Martinez, Leon" <martinezl@ftscpac.navy.mil>]

LISTEES,

I called  many  machine shops today and foud one  in National City
 and I felt that the owner prided his work on quality because he 
does not sell rebuilt cases in exchange for cases, he believes he shuold 
study the old case first before accepting it. He only sellS fully built
engines
with only german parts. He told me he only accepts german cams and
lifters for exchanges. Everything must be german, he prided himself of
being from the old school of VW thought. (phone: 619-691-8395 plug!!).

I aked him about cam matching and he told me that the VW factory does this
on 
a routine bases. They start with gears with a pitch and other varibles with
a 
deviation  of  0 (zero) then the following +1,+2,+3,-1,-2 and -3 . Each
number 
indicates a deviation of 
1/100th of a mm  from the base zero. All german cams have aluminum gears.
The new OEM cams only come with the number 0 (zero) deviation so no matching

is possible with these. the zero is just a comprimize. When he builds an 
engine , he starts with ten cams of various numbers and checks for float,
the
 most floating one is the best and will last the life of the car. His 
experience is that if an engine requires a cam with -3 deviation and 
a + 3 deviation cam is installed eventually a groung gear will result
because
of slight binding, you may not see it for the life of the engine but if
driven 
aggressively it will show up quicker. He said that what I have 
experienced on my gear is very expected, because of 
aggressive driving.

The zero deviation installed on this engine will last longer 
than the later but will wear eventually in a bad way if abused by me 
abused. The only zero cam gear that will last without 
this tweeking is the straight steel noisy gear that I was thinking about.
He got me thinking, He will sell me a matched newly reground cam/gear 
assembly if I bring my case with all the goodies ready for the same price 
of the sale. So guys if you have an original cam that came with your engine
take note of the deviation number. If you need a custom grind, regrind 
your cam or find or keep your original gear. I will buy steel
or get it matched, still thinking.

LEON MARTINEZ

1969 EFI/AUTO
SAN DIEGO AND TIJUANA

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