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Thruxton900 · Posted: Sun Aug 17, 2008 3:28 pm Post subject: Crankcase breather - great result

I have a small oil leak from the dipstick , so I flushed the breather with degreaser. I guess its now unclogged
because it now blows out air??
Ive also disconnected the other hose to the charcoal canister

Question - Should the crankcase breather be blowing out or sucking in air?

thanks
_________________
1977 NA 924 sold in 2008.
1967 Porsche 912

Ozzie · Posted: Sun Aug 17, 2008 3:29 pm Post subject:

Charcoal canister?
Is yours an oz car or an import?

The crankcase will blow out air.
_________________
Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance

Thruxton900 · Posted: Sun Aug 17, 2008 4:02 pm Post subject:

thanks ozzie

Mine has a canister in the passenger side front wheel arch.

My 924 has service history going back to 1977 and documentation that is was bought in Sydney, therefore assume
its an Australian delivered.

Does the canister suggest otherwise?
_________________
1977 NA 924 sold in 2008.
1967 Porsche 912

Ozzie · Posted: Sun Aug 17, 2008 4:32 pm Post subject:

Not really- havent seen an early model.
Mine doesnt have one but its a UK import
_________________
Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance

Thruxton900 · Posted: Sun Aug 17, 2008 8:25 pm Post subject:

Took it for a spin and got an immediate increase in responsiveness. Not just a little...quite a bit!!
And....now my tacho works properly...( needle now goes beyond 3000).
And this from only just a few squirts of degreaser( and left overnight) into the crankcase breather

explanation...?

what does the tacho run off?
_________________
1977 NA 924 sold in 2008.
1967 Porsche 912

pocketscience · Posted: Sun Aug 17, 2008 8:56 pm Post subject:

Peter_in_AU · Joined: 29 Jul 2001 Posts: 2745 Location: Sydney, Australia

Ozzie,

I'm surprised that they allowed your car to be registered in Aus without a charcoal canister. ADR27A which became law in mid-1976 was the emissions ADR and required all cars after that date to have a canister. Perhaps emissions are like red lights in the Sunshine State - optional

_________________
1979 924 (Gone to a better place)
1974 Lotus 7 S4 "Big Valve" Twin-cam (waiting)
1982 924 (As featured on Wikipedia)

Learn to love your multimeter and may the search be with you

pocketscience · Posted: Sun Aug 17, 2008 10:33 pm Post subject:

Nobbi · Joined: 24 Aug 2006 Posts: 1398 Location: Germany

Did you name your car " christine".......?

_________________
NA 924 - april/1977- 4-speed-audi gearbox.
500.000 km with fun.....and new toy:Porsche 944 S2 Cabriolet.Other car Daimler c-class cabby,brandnew..Plus : DEUTZ 4005 tractor Built 1967

RC · Joined: 25 Mar 2007 Posts: 2637 Location: Australia

Mine HAD a canister in LH wheel arch originally too. Thought they were fitted to all Au cars, early and late. Qld and SA don`t have any annual inspection like NSW or Vic.

The breather should not be blowing out much air at all if the piston rings are good. Air? coming out indicates leakage (blow by) of the rings.

The tacho runs from ignition pulses from the coil - via a green wire. Direct from the coil on points dizzys or the TIU connection that also connects to the coil - on VR (later) dizzy. Wires run along firewall behind the breather so you most likely inadvertently bridged a poor connection or broken wire. Gotta have some luck sometimes.

So if it starts playing up again you know where to look first. Or maybe it never revved past 3K with a choked breather.

wombat

Martijnus · Joined: 29 Dec 2006 Posts: 2019 Location: Netherlands

what would be the best option if you unplug the breather from the canister/intake manifold?
I've got TB's now so I can't hook the breather to my inlet (and I wouldn't want to)...

Let it hang loose in the engine bay could give a mess....I've seen filters put on the breather to filter any sucked in air...how essential would this be?

I'm surprised your cleaning made such a difference! how bad was the filth?

if your crankcase can't breathe the airpressure in the engine will rise (you wouldn't believe how much gas leaks past the piston rings) causing more resistance for the engine...
_________________
"Rule: Turbo's make torque, and torque makes fun." (C. Bell)

924 "50-jahre", 1981.
MSII/extra, LPG, ITB's, 5lug.
To be turbo'ed in a while.
Killed her at the Nurburgring, Porscheless at the moment

Ozzie · Posted: Mon Aug 18, 2008 8:43 am Post subject:

My car was originally reg'd in NSW and Vic and then I bought it.
No canister but it may be the UK thing.

I connected my breather to the air box and plugged the join. Immediate change to the response of the motor.

I unplugged the breather and changed the hose awhile back.
I had oil leaks from the crank seal, the fill cap and probably the rear seal too before this.
_________________
Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance

simsport · Joined: 06 Nov 2002 Posts: 573 Location: UK Warrington

Does anyone know if you can get the breather off the side of the block with the engine still in the car?
It seems to be shrouded by the engine mount bracket. I think my breather may be blocked.

Also are there more than one type? Mine seems to have the pipe in the middle but I have seen some with it canted over at the top.

Cheers
Simon
_________________
Blown is always best!

daveo · Joined: 02 Sep 2005 Posts: 183 Location: GB

Simon you can get it off with the motor in the car but its a bitch to get back on, you need the littlest hands on the planet but it is posible
Dave