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Scorpio
Joined: 05 Jul 2007
Posts: 1957
Location: Brisbane, Australia
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 Posted: Wed Sep 05, 2007 4:31 pm Post subject: oil in rubber airintake |
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quick question.....oil in the rubber air in take...what does it mean and what can i do about it ?? i saw it here somewhere before but cant find the link again....while im here...im deciding between the current 14 inch rims and moving to 17 inchers....what sort of acceleration loss /handling will i get from going the larger rims, as we all know the NA 924 is slow enough as it is...will 17 inchers make that much of a difference
1979 NA porsche
im guessing the 125bhp one(its australian therefore european delivered i think)
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1979 NA
MS1..EFI..
GARRETT T25 TURBO
BILSTEIN SHOCKS
GT BASED CUSTOM BODYKIT
Brisbane , Australia
Think mean think fast
all youll see is
my Porsches Arse!!! |
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Ozzie
Joined: 12 Mar 2005
Posts: 4448
Location: Townsville, Qld. Australia
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| Posted: Wed Sep 05, 2007 4:48 pm Post subject: |
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Can you put the car year and your location in your sig. Makes it easy for the rest of us.
Oil in the air intake is nothing unusual unless its a lot. It means your crankcase breather is working.
Otherwise you are getting heaps of blowby gases from the rings.
Do a compression check if your worried.
Unless you have the 5 stud brake upgrade it is hard to get rims to fit the early 924.
I got 15's and it handles better.
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Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance |
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Mike924
Joined: 12 Aug 2004
Posts: 2601
Location: IoW UK
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| Posted: Wed Sep 05, 2007 5:14 pm Post subject: Re: oil in rubber airintake |
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| Scorpio wrote: | | im deciding between the current 14 inch rims and moving to 17 inchers....what sort of acceleration loss /handling will i get from going the larger rims |
It all depends on what tyres you put on and whether you bother to maintain the original rolling diameter. Any increase in the rolling diameter will probably make the gearing too tall and acceleration will suffer (handling too, probably!).
But, a 17" low-profile tyre, for example 205/45, will keep the same rolling diameter (therefore the acceleration will be the same and the speedo will read correctly). It should also have a positive effect on the handling.
I have 195/15/50 tyres on my car, which have a lower rolling diameter than standard. This lowers the car slightly (3/4") which probably helps handling and certainly gives better acceleration. Engine speed (in fifth gear) at cruise is still within acceptable limits.
| Scorpio wrote: | | will 17 inchers make that much of a difference |
Yes!
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1985 Porsche 924 'Lux', Kalahari Beige (my ex)
1993 Porsche 968 Coupe, Midnight Blue, 6 spd
'There is no substitute for a little grease under your fingernails.' - Chrenan, 924board.org |
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Scorpio
Joined: 05 Jul 2007
Posts: 1957
Location: Brisbane, Australia
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| Posted: Wed Sep 05, 2007 7:07 pm Post subject: |
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ok thanks...sig has been changed.... i still have the 4 stud wheels and at the moment am looking at keeping it that way..
How does the crankcase breather work??.. there was quite a bit of oil there..ie there was a little at the base of the airfilter, but im guessing that it had never been cleaned out.
There are 4 X 108 wheels which im looking to get sent in from Germany...and am hoping to just get the low profile tyres here.
I think the stock tyre is 14 inch 6J or 6.5 J not sure, would 7 or 7.5J also fit..just trying to find alternate rims that would fit nicely without spacers.... rear flares and 944 front fenders are on the way. anything else i should look at for fitting tyres?
_________________
1979 NA
MS1..EFI..
GARRETT T25 TURBO
BILSTEIN SHOCKS
GT BASED CUSTOM BODYKIT
Brisbane , Australia
Think mean think fast
all youll see is
my Porsches Arse!!! |
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Ozzie
Joined: 12 Mar 2005
Posts: 4448
Location: Townsville, Qld. Australia
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| Posted: Wed Sep 05, 2007 7:30 pm Post subject: |
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The crankcase breather on an NA allows any blowby gases to be returned to the combustion chamber.
This also collects oil vapour which contributes to the oil consumption of the car.
The breather is near the LH engine mount and connects to the air box on some models or the join in the intake boots.
There is an orifice in the large hose and a filter in the engine connector.
If the orifice gets blocked the crankcase/sump will pressurise and oil will leak from the crank seals, oil pump seal and filler cap, to name a few.
If the hose breaks you will have a vacuum leak in the intake side of the engine which will affect brakes and performance.
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Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance |
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Rich H
Joined: 10 Jun 2007
Posts: 2665
Location: Preston, Lancs, UK
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| Posted: Wed Sep 05, 2007 9:50 pm Post subject: |
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The breather is before the TB, the brakes come off a tapping after the TB, brakes would not be affected under normal conditions.
If your breather hose was supposed to be connected to the airbox you will have unfiltered air entering the engine. If it was supposed to be connected to the intake pipe near the coolant tank then you will have a problem with the air flow meter as you will haev created a bypass.
Clean it all out and keep an eye on it. It will be pretty greasy in there.
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1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec |
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Nobbi
Joined: 24 Aug 2006
Posts: 1398
Location: Germany
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| Posted: Thu Sep 06, 2007 12:56 am Post subject: |
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Hello,
rumors are going around that 4 bolt wheels from, or for, a peugeot 205 will bolt on for a 924.
Check it out.
Nobbi  |
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Mike924
Joined: 12 Aug 2004
Posts: 2601
Location: IoW UK
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| Posted: Thu Sep 06, 2007 5:06 pm Post subject: |
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| Scorpio wrote: | ...and am hoping to just get the low profile tyres here.
I think the stock tyre is 14 inch 6J or 6.5 J not sure, would 7 or 7.5J also fit? |
The stock wheels are 14 x 6J. If you buy larger diameter wheels, they will almost certainly be wider (7J or more).
There is no way you can fit 14" tyre to 17" wheels, if that's what you mean. You'll need to buy tyres to fit your new wheels, depending on their width (and diameter, of course). Your tyre supplier will be able to advise which tyre widths are suitable.
_________________
1985 Porsche 924 'Lux', Kalahari Beige (my ex)
1993 Porsche 968 Coupe, Midnight Blue, 6 spd
'There is no substitute for a little grease under your fingernails.' - Chrenan, 924board.org |
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