[DeTomaso] vacuum line schematics

[F&D Terry]

As a matter of interest, PVC systems go back at least to '54. I have a 
'54 Chevy shop manual that mentions servicing of the PVC system by 
disassembling the valve and washing it in solvent. Not all Chevies were 
so equipped but some models must have been.

Shady used car dealers of the same era sometimes made use of a heater 
hose that they connected to the draft tube Bill mentions. They then 
connected the other end to the air cleaner. This was done in an effort 
to minimize the smoke from the junker, turning it into a one owner 
driven by a dear old lady to church. Most air cleaners were of the oil 
bath type so I guess it didn't matter.

Fred T.

SOBill at aol.com wrote:

>Art,
> 
>The PCV is to remove blowby from the crankcase and burn it in the  engine.
> 
>In olden times, cars had a tube from the crankcase to the bottom of  the 
>chassis. The end of the tube was cut with an upward slope to the rear. As  the car 
>traveled down the road, air flowing over the tapered cut on the tube  created 
>a slight vacuum which pulled vapors from the crankcase and dumped them  into 
>the atmosphere. Often as much smoke came from the tube as came from the  
>exhaust pipe.
> 
>I know about that because I had one those dual  smokers.
> 
>Have fun,
> 
>SOBill  Taylor
>sobill at aol.com
>
>
>
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