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



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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