Is this at all possible?
Lately some of us have become more interested in properly adapting the L61 PCV system for boosted setups.
The main problem seems to be that the vacuum port in the head becomes pressurized by being routed to one of the runners in the intake manifold. This port can be blocked with the LSJ gasket , but that doesn't properly solve all issues. If you could tap the eco block somewhere else to provide a vacuum feed then blocking the port may be a good option. I'm currently not aware of where else you could tap to provide an equivalent function.
If one was able to block the feed to the runner and tap the stock manifold with a vacuum port that could be routed to the intake this might solve the problem. I'm not aware if there is a safe and reliable way of sealing off the feed that goes into the runner on the stock L61 manifold. This might be answered if someone had a spare manifold to cut up.
Another idea I came up with was was to use the GMPP Intake Manifold flange as a spacer between the head and the stock intake manifold. What you could do is on the head side of the flange drill a hole where the vacuum port is on the head in about half the width of the flange. Then drill another hole from the top of the flange down through the middle of it to intersect the first hole. You then tap the hole on the top of the flange with a nipple which can be hooked up to the intake somewhere. Because the flange is not drilled all the way through it will be effectively blocking the feed going to the runner on the manifold side.
The flange is 125 bucks so it may/may not be worth it to some if they could purchase an aftermarket log manifold which had the same option for a few hundred bucks more. Using the adapted spacer with the 2.4 eco manifold may be a good option.
http://gmperformancepartszone.com/ecotec-intake-manifold-flange-p-6331.html
The other option I have thought about is the possibility of adapting and LNF manifold. This would require re-routing of the charge pipe because the opening on this manifold faces downward. I'm also not sure how the LNF system varies from that of the L61 manifold. We need get our hands on one of these manifolds and see if at all possible. They however are very hard to get a hold of and most likely cost what a aftermarket manifold would if your paying what GM wants for a new one. It would also require some additional work due to the throttle body mounting / map sensor configuration etc.
Still the SAAB manifold may be the cheapest and easiest compromise. My guess is it works similar to the L61 mani with the vacuum feed running to one of the runners. This could be easily welded up and then tap the flange to install a nipple. I'm not aware of anyone who has done this yet.
Lets hear some thoughts and ideas.
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Hahn Stage II - Mitsu TD06-20g |3" Turbo-back Exhaust | 61mm Bored TB |
HP Tuners | Innovate WB02 | Spec Stage 3 | Team Green LSD | TurboTech Upper | Full Addco Sways | Sportlines & Yellows |
Well I guess the Saab manifold must have a nipple on it already since it was meant for a boosted application? Anyone who has one of these want to confirm how it works and also how the line routing worked while it was on the car? Guess I need to find an actual car somewhere.
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Hahn Stage II - Mitsu TD06-20g |3" Turbo-back Exhaust | 61mm Bored TB |
HP Tuners | Innovate WB02 | Spec Stage 3 | Team Green LSD | TurboTech Upper | Full Addco Sways | Sportlines & Yellows |
lmk what you come up with eric.
Built&Boosted moar
04 Cavalier Turbo r.i.p my baby
2nd place 2009 GM tuner bash qwick 8--holla
