[Inkedupfatboy]

Also wash it before you switch to tonsil mode - lol

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[tamathumper]

Reinstalled the air/oil separator, and put the intake manifold back on tonight. All of the vacuum lines are re-connected with new pipe clamps or using the "silicone hose trick", and all of the seals that were exposed are new (including the little o-rings at the top and bottom of the oil dipstick). The fuel rail is back on and all of the electrical connectors are re-connected. Tomorrow morning I'll put the plugs back in and re-connect the fuel rail, re-install the supercharger plumbing, and make sure everything is at least back to running order, then I'll get busy on that oil in the cylinders.



Ow, my fricken' back!

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[flash]

lol - tell me about it. after months of bending over that engine bay, working out the supercharger, and then months trying to figure out my oil consumption, i'm completely over ever wanting to get in there again.



yet, i'm doing another installation in a couple of weeks



i'm just not very bright

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[tamathumper]

As I was cleaning out the intake manifold, I noted that the oil deposits go way up into it past the point where you can see "around the bend". If it were coming from the valve guides, would it "blow back" that far? I suppose that, again, would depend on the timing and valve overlap?

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[flash]

being a dual resonant manifold, the air recirculates in there

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[tamathumper]

Everything back together and car running pretty much as it did, it's stronger (maybe), but there's still a hesitation when cold, running better when warm. Still a loud hiss from under the intake manifold and pressure drops quickly when pressurizing with the compressor - so time to re-test vacuum (with both gauges) and troubleshoot leaks as if from the beginning... I tested every hose and component for leaks, so I feel good about them, and now at least I have a *much* better understanding of what is hooked up to the intake manifold, and where the heck it goes.



Interestingly, this oil thing is new since I installed the supercharger. There is quite a bit of oil on the pintle caps of the injectors, and I recall when I uninstalled the old ones, they were dirty but dry. So I'm going to revisit all of my posts since then to see what has changed, like the oil type (15W-50 Mobil 1), for instance, and what procedures were done, like the pressurizing of the intake manifold. If it was overpressurized and popped a seal on the AOS, it would have pulled a lot of oil vapor in. But at no point has there been so much oil vapor that the engine was making any smoke out the exhaust pipe.



The saga continues.

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[flash]

bummer, but predictable



take a paper towel and wipe the inside of the tailpipe and see if it's wet or slimey.



another leak down test, this time listening to the various points with a hose to your ear, should indicate where your leak is.



i have a feeling you are going to be pulling the head and having it done.

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[tamathumper]

Inside of tailpipe is coated with a thin layer of dry, black soot.

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[vliegwielolaf1234]

[quote name='tamathumper' timestamp='1377878006' post='148403']

Everything back together and car running pretty much as it did, it's stronger (maybe), but there's still a hesitation when cold, running better when warm. Still a loud hiss from under the intake manifold and pressure drops quickly when pressurizing with the compressor - so time to re-test vacuum (with both gauges) and troubleshoot leaks as if from the beginning... I tested every hose and component for leaks, so I feel good about them, and now at least I have a *much* better understanding of what is hooked up to the intake manifold, and where the heck it goes.



Interestingly, this oil thing is new since I installed the supercharger. There is quite a bit of oil on the pintle caps of the injectors, and I recall when I uninstalled the old ones, they were dirty but dry. So I'm going to revisit all of my posts since then to see what has changed, like the oil type (15W-50 Mobil 1), for instance, and what procedures were done, like the pressurizing of the intake manifold. If it was overpressurized and popped a seal on the AOS, it would have pulled a lot of oil vapor in. But at no point has there been so much oil vapor that the engine was making any smoke out the exhaust pipe.



The saga continues.

[/quote]

The loud hiss under the manifold , i had the same , was the breather hose it had a valve in there (92) later car's do not have the valve to my knowledge , but it opens under positive pressure only , so i removed it and put a plug in there .

I found in pet that it was also used with the S2 .

I do not think it would cause a problem during normal operation even with the sc , but during a pressure test it wil open up and it made so much noise that it was impossible to find the other leaks .

I have picture of it in my post on the sc install .

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[tamathumper]

No breather hose valve on mine.

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[flash]

if by "breather hose" you mean the large one that goes from the AOS to the throttle body (which is re-routed for the SC), i have never seen a valve of any sort on any car. that would be akin to a PCV valve, but i've never seen one on an OEM 968

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[kwikt]

Yep. my 92 has one. It's an inline pcv valvle that comes off a T in the hose connecting the throttle body to the AOS. Wow, if it is not needed maybe I'll plug it and see how it runs. Interesting!!!!

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[tamathumper]

Where and what is the check valve you referred to several of you having, in that other post, flash?

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[kwikt]

The part # is 94410732400 and is listed for 89-91 944's. Not sure what it does, so I may remove and plug it today and check vacuum before and after. Hopefully I don't need it. Tama, do you have the small vacuum line line connected from the intake manifold to the AOS cap? Strange that it is not listed under 968. Almost like my top coolant hose to metal coupler is from a 944.

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[flash]

the 92 upper coolant hose is a metal one.



however, i think somebody stuck that valve in there. i've never seen one on a 968. of course, now i'm going to have to go and look at other 92s to be sure.

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[Cloud9...68]

kwikt?



Would you mind posting a picture of what your car has? Thanks.

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[kwikt]

Here it is. And if you notice in the background, my metal coolant pipes are connected by a rubber coupler which is a 944S2 part.

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[flash]

as i said, 92s had metal upper coolant pipes.



as for the valve, that definitely does not look stock. first off, such a valve would not be allowed to vent to atmosphere. it would be re-routed back into the system. ARB has not allowed venting like that for decades. i would be extremely surprised if that was OEM. second, that clamp does not look OEM.

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[MB968]

I have a 92, but I don't have a metal coolant pipe/hose, nor do I have a part that looks like whats in Kwikt's pic. Maybe 92 was just the Lets use up the spare parts year.

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[kwikt]

Oh no Flash, the hose clamp was replaced by me when I first got the car. Actually there was no clamp on it at all. It is definitely a 944 part. I just removed the valve and plugged it, I'll let you guys know if there is a diff.

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