Re: [DML] SuperCharger and Engine Vacuum

[Martin Gutkowski - DMC Ltd <martin@xxxxxxxxxxxxxx>]

Hi Nick

You seem to be a bit confused here, but I'll see what I can come up with...

 >My question is how exactly does the crankcase get it's vacuum??
 >
The crank case is vented through the oil filler. It's not necessarily
under vacuum at all times.

 >and
 >what purpose does the brass tube under the fuel distributor serve in
 >relation to this (if any.
 >
The brass pipe under the metering head, or under the whole intake
venturi? The one directly beneath the metering head is the idlespeed
throttle-bypass. The big long one with the cold start injector on the
end serves to apply engine vacuum to the oil filler, to the charcoal
cannister, and connects directly to the centre of all siz intake ports,
so is connected to the idlespeed motor, and the cold start injector.

 >I have removed all the old EGR system so do i still require the hose
 >off the brass tube to the small tube on the filler cap??
 >
The DeLorean engine does not have EGR. But the answer is yes, you still
need that. I would install a non-return valve in it through so you don't
end up pressurising the crank case too much to the point of blowing oil
out through the main seals. However the Renault ones don't have the
vacuum feed, just the breather. The cap is clipped on and the breather
has a catch tank that feeds back to the sump.

 >The large
 >tube on the filler cap i have connected to the intake before the
 >throttle plate.
 >
That goes to the air intake simply so it gets filtered air drawn through
and into the intake via the smaller hose.

 >Is the brass tube under the fuel distributor feeding off the
 >manifold or does it go right through and feed into or off the valley
 >(crankcase)
 >
You've done this installation and you haven't had the intake manifold
off?! It goes to the manifold. It's part of the air intake.

 >How would this function now the manifold will be under preasure and
 >not vacuum??
 >
The same as all the othe aftermarket turbo engines: Not as it was
designed to.

 > I also have a blow off valve that will re-circulate
 >the boost back into the intake at idle.
 >
A blow-off valve (dump valve over here) is there to vent boost when the
throttles shut and is actuated with vacuum downstream of the throttles.
It doesn't do anything at idle.

Martin







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