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xanderdeg · Posted: Fri Nov 01, 2013 4:40 pm Post subject: JUST KIDDING!

So I took the porsche for a nice long drive tonight and there's absolutely no way I'm selling it.

Here are some reasons that it's better than the jetta:

It runs better
It drives better
It looks better
It feels better
It turns heads
It's something special and hard to find
The jetta is a boring car
The jetta has 378000 kilometers
The jetta has only 68hp
The jetta smells funny inside

etc...

Now that i'm keeping the porsche and will be daily driving it sometime soon (once I've sold the jetta and figured some stuff out)

I need some help from the board!!

I think I have abnormally high crankcase pressure.
After arriving home tonight I did the usual look under the hood. And as usual there was oil running down from the dipstick hole and on to the ground...

I feel like this high pressure had something to do with my blowout in june.

My breather seems to be breathing properly so I'm not sure why there would be so much pressure that oil comes out from under the dipstick...

My cooling fan doesn't work. The thermo switch works fine and the fan motor works fine as well. The fan fuse is also A-ok.
Should I just wire it to a manual switch in the cabin that connects the fan directly to the battery?

I'm also looking for some sunroof and headliner components. Anybody selling?

Kens_74_911s · Posted: Fri Nov 01, 2013 8:19 pm Post subject: Headliner and S/roof

Sent you a PM
K
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Ken - ebay: wandrey1 , *0 , *00 , *01
74 911s widebody
96 BMW 750iL
99 BMW 328i
81 VW MK1-1.8 GTI, 5 spd Pickup
02 Explorer (wife's)
92 BMW 735iL Parting
84,85,86x3,87,944. 82-924,88-924s parted
68, 70, 72, 73, 911~ 70,73 914 past Pcars

924RACR · Posted: Fri Nov 01, 2013 9:57 pm Post subject:

High pressure in crankcase... that comes from blowby, from poor ring sealing. If the engine's recently refreshed, that'd typically indicate improper ring seating... if it's not fresh, then ring wear.

We regularly have some leakage from the dipstick hole on our racecar. But mainly ignore it, since it's modest, doesn't actually lose much oil, and won't be enough to make a mess on track.

Make sure the breather hose doesn't have a kink in it, etc.

Cooling fan operation: either you don't have power to the fan, or a ground for the temp switch. If you short out the switch, the fan doesn't run, correct? That's with ign on, BTW...
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'79 924 #77 SCCA H Prod racecar
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larchie · Joined: 19 Jun 2003 Posts: 297

xanderdeg · Posted: Sat Nov 02, 2013 4:54 am Post subject:

xanderdeg · Posted: Sat Nov 02, 2013 4:57 am Post subject:

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

The breather hoses on the NA cars have a restrictor in them. From what I understand, it's a wooden plug with a small hole drilled thru it. It's possible that your restrictor is blocked, and it's also possible that your crankcase breather attachment is clogged, both of which could contribute to excessive pressure.

It would at least be worth a try to remove the bleeder line and check to make sure the restrictor is intact and passing air; and then to back flush the breather attachment on the block. Most guys use gasoline to do this...drain the oil, leave the drain plug out, put a catch tray under the oil pan and flush thru the breather thoroughly. Make sure you give the gasoline time to evaporate out of the oil pan before refilling the oil. You don't want contaminated oil on your bearings.
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erstwhile owner of just about every 924 variant ever made

xanderdeg · Posted: Tue Nov 05, 2013 1:31 am Post subject:

I set up a new breather hose a while back that vents to atmosphere instead of to the airbox. I've put my hand in front of it while the engine is running and there seems to be good flow through the breather. Should I still flush the breather attachment just to make sure its venting enough?

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

Your problem may be that you don't have the restrictor in there, and that the way you currently have things plumbed, you have insufficient vacuum. So you may not really have an issue with crankcase pressure.

Here is an entertaining and informative read on the subject:
Rasta, you suck, and you owe me $100.

I would suggest trying to re-plumb things back the way the were from the factory (even if you have to fabricate a restrictor and line) before you do anything else.
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erstwhile owner of just about every 924 variant ever made

tyfighter123 · Joined: 19 Jan 2010 Posts: 551 Location: Colorado

What is the point of the restrictor? I don't have one on mine. What would I gain from adding it?
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Porsche 924 1977 N/A
Mustang GT/CS 2007
Porsche 924S 1987 (parts car)(cut up and recycled)
Porsche 911S 1976
Porsche 931 1980
Porsche 931 1980 (parts car)

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

What I've been able to distill from the above threads (or possibly those linked to that thread) is that the restrictor and small hole perform the same basic function as the air-oil separator on the 931; the restrictor apparently allows vapor to be drawn into the airbox (by negative pressure) thru the tiny hole drilled into it, while not allowing the larger oil droplets to be pulled thru (they presumably precipitate out and back into the crankcase thru the breather attachment on the block).
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erstwhile owner of just about every 924 variant ever made