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Hey Simon-
> I've been out and had a look at my two1969 magnesium Type4 "V" series
crankcases
> (one in the car and the other not) and both cases have two small seams on the
top
> of each crankcase half, both left and right. I have also checked on an
aluminium
> "AP" series Type4 engine (1974-1975 twin-carb Transporters) and it also has
two
> seams across the top of each crankcase half. I had never noticed them
before.
On both halves? That's interesting... On the late bus "CB" case I have in my
garage there are no transverse seams on the very top of the left case half.
I'll inspect my 1973 914 2.0 "GA" case tomorrow morning. I also have a dead
early 914 1.7 "EA" case in CA that I can check on. The other couple I have
available to me are in IL.
> (2)
> I have always wondered what alloy the 1600 "CT" and "CZ"(M240) cases were
made
> of. Now, it really surprises me to hear that they are magnesium. Because
there
> are significant casting differences with these cases compared to the normal
> Type1/Type2 cases (such as for the hydraulic tappets and the full-flow oil
> filter), I would have thought that Volkswagen AG would have taken the
opportunity
> use aluminium in what was then a new engine and especially as these two
engines
> ("CT" and "CZ") were designed exclusively for the Type 24 and Type 25
Transporters
> and likely to get hot and have to work very hard.
I know very little about these (never seen one with my own eyes), but just
found a great reference on the web:
http://www.type2.com/library/engineg/boxeng.htm
It has much more than I ever knew about them :-).
It does seem odd that they didn't use aluminum here. In my mind, that seems to
support the idea that indeed it is cheaper for VW to cast a magnesium alloy
case than an aluminum one, but I dunno.
> (4)
> Now, regarding AS21 and AS41 castings, I understand that AS21 alloy cases
(with
> less magnesium in them) were generally used for fuel injection Type1 engines
(e.g.
> Beetle "AJ" series 1974-1980). Was this also the case with fuel injection
Type3
> motors such as the "U" and "X" series cases? (I understand, too, that Gene
Berg
> did not recommend rebuilding AS41 engines because they were too soft.)
I once knew the changeover years for the alloys, but I forget them now.
Tomorrow at work I'll dig around for some data on these alloys... that might be
interesting.
Thanks for the groovy info!
Take care,
Shad
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