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Air Hoses

R

rwebster60851

New member
Hi

I have brought a 944 which is so much fun to drive and already completed few things to help it become a better car and more original. I have noticed that the hose which connects the pipe work from the engine to the airbox seems to have a section missing. The section is hidden in the wing but I can feel that it does not have a hose here, I assume I am correct in thinking that it should be connected? is anybody able to help me identify the section of pipe so that I can order one, and also where you buy your Porsche parts from? I have looked in the Porsche Manuel of parts online but cannot locate it. Any help would be appreciated.

Stay Safe.

Russell
 
Hi Russel,
The air cleaner / inlet system varies between the 944 / 944 turbo / 944 S2. If it's the base 944 Lux, I think the supply into the air cleaner box comes from inside the inner wing - there's a rubber bellows seal that holds the end of the air cleaner inlet pipe in the wing hole. (I think - based on the PET illustrations - mine is an S2 and it has its air cleaner hidden under the badge panel.)
Hope that helps, if not someone else will be along I'm sure!
You can find the parts catalogue for your car here: https://www.porsche.com/uk/accessoriesandservice/classic/genuineparts/originalpartscatalogue/
Cheers
 
Hi Steve

Thank you for your reply yes it is the 944 Lux, as you said that air filter goes into the nearside wing which has rubber seal and then does not connect to the next section of pipe, I will however have a look at the link that you sent through which will hopefully solve the problem but again thank you for replying. I am looking to increase my knowledge and understanding of this car so every little helps.

Keep safe

Russ
 
Hi again Russ,
OK, I don't think there is a next section of pipe - where it enters the wing is just where it collects the air from. In other words - I don't think there's a problem - it sounds like your car is as it should be. [:)]
Keep well,
Steve
 
Yep, in my 2.7 it just goes up to the wing and takes the air in from there - good because unlike many low sports cars it’s quite high up so less prone to water intake from floods etc. (Not that mine ever goes out in the wet! - I’ll keep my shiny new sills that way thanks!)
 
Hi again,
Just a further thought... The only reason the intake pipe is connected to the wing is so that the engine sucks in cooler air from outside the engine bay. With all the engine trays in place the engine bay gets pretty hot, and engines run better on cooler, more dense air. Cooler = denser = more Oxygen per cubic metre = better combustion. I seem to remember my Dad's old Austins & Morrises had an air cleaner with a movable intake. There was a "Summer" position which pulled air from outside the engine bay, and a "Winter" position where it collected hot air from near the exhaust manifold. This was in the days before electronic fuel injection when carburettors used to ice up on cold mornings!
Anyhow Russ, enjoy your 944 and keep up on the forum, it's good to hear what other 944 nuts are up to.
Cheers,
Steve
 
My red 924S came with a large cone filter hanging loosely attached to the AFM in the space where the the normal 2 items sit .
We made an aluminium bracket which fits to the existing fixing locations ,picks up on existing holes in the AFM including a new cork gasket.
I then procured an length of that rubber/fabric spring lined air hose about 65mm dia & that was inserted in the hole in the inner wing & fixed flexibly with a large cable tie so it directs air directly into the centre intake of the cone filter..
Theory suggests you benefit from a "ram" effect as speeds increase & in the past ,I know I had to richen the mixture slightly on a tuned Mini so equipped.
 
vitesse said:
My red 924S came with a large cone filter hanging loosely attached to the AFM in the space where the the normal 2 items sit .
We made an aluminium bracket which fits to the existing fixing locations ,picks up on existing holes in the AFM including a new cork gasket.
I then procured an length of that rubber/fabric spring lined air hose about 65mm dia & that was inserted in the hole in the inner wing & fixed flexibly with a large cable tie so it directs air directly into the centre intake of the cone filter..
Theory suggests you benefit from a "ram" effect as speeds increase & in the past ,I know I had to richen the mixture slightly on a tuned Mini so equipped.
Click to expand...


The Ram air effects will only work if the induction system is sealed and not open and exposed like a bolt on / clamp on cone filter.

Exposed Cone Filters are notorious for reducing engine power due to the increased air temps, here's an example on a 997
https://www.youtube.com/watch?v=mc9c07qCuKY

R
 
That's why you fit a separate air supply tube right up to the filter & there is some ram effect because of this which does supply cooler external air although clearly engine compartment warmer air can get mixed in as well.
I would have thought rear engined mounting is rather different to a 924/944 with the large free area on engine LHS
 
vitesse said:
That's why you fit a separate air supply tube right up to the filter & there is some ram effect because of this which does supply cooler external air although clearly engine compartment warmer air can get mixed in as well.
I would have thought rear engined mounting is rather different to a 924/944 with the large free area on engine LHS
Click to expand...


If you mean like the picture attached? then it's simply too exposed to the engine and radiator heat, in a front or rear engined car
The original 944 n/a has a fully sealed airbox and a snorkel trumpet that fits inside the wing and draws air outside the hot engine bay, as does the S2
which has the sealed airbox under the badge panel.

Aiming a hose at the filter which is surrounded by hot air is going to fairly useless (Unless the filter is sealed in a box)

The losses in power may not be noticeable on a road car, but they would and do show on Dyno's and the track / race use...

A Ram air effect has to build up pressure to work properly, which if the system was sealed and air (couldn't escape) would have a chance, but a open pipe aimed
at a cone filter will have no pressure and hence will dissipate and join the HOT air surrounding the inside of the engine bay

R
 
vitesse said:
That's why you fit a separate air supply tube right up to the filter & there is some ram effect because of this which does supply cooler external air although clearly engine compartment warmer air can get mixed in as well.
I would have thought rear engined mounting is rather different to a 924/944 with the large free area on engine LHS
Click to expand...


A sealed inline airbox like this K/N will allow the engine to digest lower air temps better...
R
 
A word of warning on a ram air system for a modified turbo engine... don't... I learnt from bitter experience that in these systems the filter may be bonded in... might be ok for a mildly tuned car but not one which can suck in the Atlantic ocean.. if you get my drift... my engine sucked in the filter and destroyed both turbo and intercooler in the process.

I do have a lot of induction on my car though, I can tell when the cone air filter (very large) needs cleaning/changing by it's squashed shape...:)

Pete
 
PSH said:
A word of warning on a ram air system for a modified turbo engine... don't... I learnt from bitter experience that in these systems the filter may be bonded in... might be ok for a mildly tuned car but not one which can suck in the Atlantic ocean.. if you get my drift... my engine sucked in the filter and destroyed both turbo and intercooler in the process.

I do have a lot of induction on my car though, I can tell when the cone air filter (very large) needs cleaning/changing by it's squashed shape...:)

Pete
Click to expand...


That's the pressure of a Forced induction spinning turbine Pete, not a higher atmospheric pressure from the outside air inlet...

An external air supply that's intended to create a ram-air intake works by reducing the air velocity by increasing the cross-sectional area of the intake ducting so that the dynamic pressure is reduced, while the static pressure is increased. Then the increased static pressure in the plenum chamber has a positive effect on engine power, because of the pressure itself and the increased air density that this higher pressure gives.

R
 
PSH said:
thank's Roger... I did realise this...:)
Click to expand...
Ok, only you said
"A word of warning on a ram air system for a modified turbo engine... don't..."
"my engine sucked in the filter and destroyed both turbo and intercooler in the process"

This will be because I'm guessing you used an open cone clamp on filter close to the TB ?

R
 
No...I used a Piper Ram air system which looks very similar to your K&N....the foam filter material is bonded within it, the induction forces on my car were far too great for the bonding, hence why it failed.
 
PSH said:
A word of warning on a ram air system for a modified turbo engine... don't... I learnt from bitter experience that in these systems the filter may be bonded in... might be ok for a mildly tuned car but not one which can suck in the Atlantic ocean.. if you get my drift... my engine sucked in the filter and destroyed both turbo and intercooler in the process.

I do have a lot of induction on my car though, I can tell when the cone air filter (very large) needs cleaning/changing by it's squashed shape...:)

Pete
Click to expand...


With a bigger turbo and higher boost (18psi) I managed to suck the standard turbo air filter out of the position in the airbox (with all fixings in place and tight) and it folded neatly around the airbox outlet!
Tony
 
I did also run a K&N panel in the standard airbox for a while but found fine dust downstream of it despite it being cleaned and well oiled - It didn't suffer the same issue with collapsing though,
Tony

 
Think I remember Diver saying his 3.2 with bigger turbo was sucking excessive oil into the turbo before he fitted the MAF. Maybe enlarging the AOS hole is the cure?
 
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