G60 Scirocco Progress

[nocones77-vw at yahoo.com (nocones77-vw@yahoo.com)]

The charger already has an oil line feed for the bearings. What Gordy was talking about was the boost return line.

Since the throttle is *after* the supercharger on the G60, there's a bypass valve that sends unused boosted air back to atmosphere when the throttle is closed. The factory takes that unused air and routes it to a second intake on the charger. Along the way back to the charger, the crank case vent is plumbed into this tube as well. The small amount of oil mist collected from the crank case vent helps to lubricate the apex seals on the charger.

Gordy, I'd just re-use the factory boost return as BBM suggests. But you certainly could put an air filter on the bypass valve port on the throttle body, and vent it to atmosphere. I would definitely recommend that you then plumb your crank case vent to the driver's side inlet on the charger like you're talking. The only real potential problem is that you're gonna end up with blow-by fumes venting to atmosphere right near the fresh air intake when you're off-throttle. And if you either end up with a lot of blow-by from the crank case vent, or if the charger main seal starts leaking (pretty common) you're gonna start dumping oil all over the back of the engine bay...especially on your exhaust downpipe. Not so good. Ask how I know. :-)

I buy all my intercooler/intake plumbing supplies from http://www.roadraceengineering.com/ . If you have access to a welder and an angle grinder with a cutoff wheel, you can make anything you need. 2.25" intercooler tubing is totally sufficient for a G60, and is much easier to deal with not only because of the tubing diameter, but also because you can get tighter mandrel bends.

Neal
1977 Scirocco - Rotorcharged PG


----- Original Message ----
From: Peter <peter@thescirocco.com>
To: Gordy Stedman <ydrogs@gmail.com>; Scirocco-l@scirocco.org
Sent: Thursday, February 1, 2007 1:11:46 AM
Subject: RE: G60 Scirocco Progress

Using oil blow by for lubrication doesn't sound like a good idea...
I would think that the blow off would have carbon in it, and who knows what
else.
Isn't there a way to run an oil line to it?

I have this 2 1/4" piece:
http://thescirocco.com/images/ForSaleInterCoolerPipe.jpg
http://forums.vwvortex.com/zerothread?id=2609619

Peter

-----Original Message-----
From: Gordy Stedman [mailto:ydrogs@gmail.com] 
Sent: Thursday, February 01, 2007 12:48 AM
To: Cory Langford; Scirocco-l@scirocco.org
Subject: Re: G60 Scirocco Progress

On 1/31/07, Cory Langford <Cory_Langford@bcit.ca> wrote:
>
>  Looking good.
>
> I still have the air filter sitting in the same position with out the 
> cold air draw. I have been meaning to put a vent into the inner fender 
> well there to pull cool are in rather than sucking in the hot air from the
engine comp.
> as it is now.
>
> Did you do anything to compensate for the about of water that gets 
> thrown around in the wheel arches? It is pretty wet up here and that 
> was my only concern is keeping the spray from the tires out of the intake
area.'
>

I will have to look into the best way to track the air in around the bumper
support and the fender well.  I installed it there since that was the
easiest place to mount it.  I was thinking of piping air in from the vent
duct on the air dam.    I was planning on making a piece to block off the
air from the engine bay.

 Also notices you blocked off the return to the charger. Are you still using
> the butterfly valve for boost release? If you are you might want to 
> pipe it down under the car somewhere with a baffle. I tried that and 
> it makes a very interesting whining/whistling sound constantly as you 
> always have boost release under normal driving conditions. Make heads 
> turn beside you though
> :)
>

I do not know the best route to go.  BBM does not recomend using a BOV with
a supercharger but other have done it.  BBM says that the return line should
be used and there is no performance difference by not sending the warm
unused air back into the supercharger like others on the horetex have
explained.  I mostly disconnected the supercharger return line so I could
use the standard radiator instead of the Corrado one.  BBM says that the G
lader gets lubercated by the oil blow off from the head so I am going to tap
into the block off plate and send the blow off oil into it instead of into a
can or filter via rubber hose.  Interested in what your baffle consists of,
sounds like the way to go since I do not want all the extra noise.

Anyone have any 2.25" or 2.5" intercooler ducting for sale?  Stuff is way
expensive new.

--
Gordy
MK1 x 4
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