[DML] Re: PCV valve failure [was: Unprotected DeLorean Ignition Circuit]

["bitsyncmater" <david.mckeen@xxxxxxxxxxxx>]

I think a PCV valve is not a check valve but a controlled volume 
(like an orifice).  If you use to much vacuum flow you will never get 
your idle speed down to 750 RPM. (Just like other vacuum leaks)

--- In dmcnews@xxxxxxxxxxxxxxx, Martin Gutkowski <martin@...> wrote:
>
> 
> Just thought I'd share how the later Renault Turbo engines are set 
up.
> 
> The early turbo engines have a breather with two ports - and some 
are 
> nothing more than a cap, others have the gauze in them like the 
DeLorean 
> one The smaller hose goes again to a deliberate "leak" of approx 
1/8" 
> diameter straight into the intake manfiold but crucially via a non 
> return valve. The larger vent hose goes via a catch tank which has 
a 
> drain hose dropping back into the crank case, and a breather to the 
> "clean" side of the air filter upstream of the turbo. The catch 
tanks 
> were notorious for splitting and later engines had a single large 
> breather hose which was plumbed very simply into the clean side of 
the 
> air filter upstream of the turbo. This is how I set up my single 
turbo 
> DeLorean engines.
> 
> Rich Johnstone's twin turbo (an Island kit recycled onto a Renault 
2.5 
> engine) has its air filters directly on the turbos, so we used a 
> standard DeLorean breather and plumbed it into the intake manifold 
via a 
> non return valve, and put a breather filter on the large barb. This 
> means it only vents crank case fumes to the air when under boost. 
> Experience showed that without any form of recirculation, it would 
chuck 
> out the most when on overrun immediately after lifting off.
> 
> Martin
>



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