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Re: Cool tins?



> EduardoG=> Can someone explain what they are, and assuming they are a 
>         => good thing, can they be retrofitted to a '67?
> 
> They go up between the pushrod tubes and the cylinders, replacing the 
> stock flat tin, to shape airflow more tightly around the bottoms of the 
> cylinders. I've yet to see anyone show them to be harmful, and many 
> report good results, so many that they are pretty much standard on 
> rebuilds here in Arizona. They'll fit your '67 (and any other year) just 
> fine. Wire them onto the cylinders after you've set the jugs and before 
> you put on the heads. Buy black, not chrome.

Okay, let me explain this a bit more.  In 71 VW introduced a 
different kind of under cylinder air deflector on the T3s only.  
These have come to be called "Cool Tins" because they are thought to 
provide better cooling.  I suspect this is true, but I have no data.  
I am, however, willing to believe that VW did not do this for no 
reason, so I believe there must have been a reason, even a good 
reason.  So let us accept the fact that they are a good thing.

At the same time that the cool tins were introduced, the lower 
cylinder cover plates (both sides) and the lower rear air deflector 
plates were both changed to clear the new, larger cool tins.  If you 
try to install the cool tins using any of the old style lower 
deflector plates you will find that in several places you now have 
two pieces of metal both determined to occupy the same space.  Since 
this is impossible, you cannot mount this collection of parts in 
quite the desired position, and it is thus impossible to know how 
close you have come to meeting or exceeding the cooling of even the 
old style of cooling plates.

I use the cool tins on most of the engines I build, but I usually 
start with a late (70-) engine and case, and replace the necessary 
parts to come up with the 71- arrangement.  I can do this only 
because I have lots of parts around from having disassembled lots of 
engines.  When assembled with the correct parts, everything fits 
without interference, and nothing needs to be wired into place.

If you are just trying to give new life to an old engine, however, I 
see no reason not to just use ALL the old cooling tin and forget the 
cool tin.  That having been said, I have a brand new OEM set of cool 
tins that I would be willing to sell for whatever the current market 
price is, if anyone is still interested.

Jim
-
*******************************
Jim Adney, jadney@vwtype3.org
Madison, Wisconsin, USA
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