I noticed this hose in another post and wondered what it is. It is the flexible hose from off the snout of the air cleaner input and seems to run to the vent on the RHS chassis frame (the one that goes through the body). I assume it is an attempt to draw in cooler air? I cant seem to see the part listed on PP or elsewhere. How relevant is it?
Merv
Member # 2633
Cars:
Porsche '68 - 911N (Sold)
Porsche 356B (T-6) S Coupe
Porsche 2008 C2 997 Cabriolet (Sold)
Porsche 2010 Gen.2 Boxster S
Close Merv but it's actually for warm air. The pipe in the rail picks up on the warm air pipe coming from the heat exchangers. I'm not sure what the principal was but someone here will know
John Forcier
EarlyS #1987
1968 911 Race Car "Grun Hilda"
1969 S/T interpretation "Blau Healer"
Restoration Saga
Merv,
It's a pre heat for the intake, it should connect to a pipe that is just below the oil filter, on the RH longitudinal.
It's fed from the RH heat exchanger through the flapper box.
Not that important for where we reside, but can still be fitted, as if you don't have the heat in the cabin on it shouldn't be getting any hot air, assuming the flapper box is set right.
Hope that makes sence?
Tony
John can obviously type quicker then me.
My understanding of it's function is that as it gets cooler the density will change, effectively leaning out the air going to the carbs.
You would obviously have the heat on in the cabin, so it would effectively pre heat the air going to the carbs.
It was fitted to a lot of light aircraft from the 40's and 50's, so I assume that's where they got the idea, but not certain.
Tony
Interesting. I have completely refurbished the flapper boxes and have a metre of new orange tubing to cut and fit. I might leave this additional tube off, however. Heating is not such a problem here ... Cool air would be nice!
Member # 2633
Cars:
Porsche '68 - 911N (Sold)
Porsche 356B (T-6) S Coupe
Porsche 2008 C2 997 Cabriolet (Sold)
Porsche 2010 Gen.2 Boxster S
Agreed not really needed in our climate
Tony
I have been quite pleased with the car since I fitted the original air cleaner. Seems smoother and has a lot more power. Maybe because I checked the WOT position on the carbs, relative to the available movement throughout the throttle linkage rods and bushings, and found that it was depriving me of over 30%!
Member # 2633
Cars:
Porsche '68 - 911N (Sold)
Porsche 356B (T-6) S Coupe
Porsche 2008 C2 997 Cabriolet (Sold)
Porsche 2010 Gen.2 Boxster S
Quite a few people have mentioned a preference for the factory airbox on a road car. I know two respectable tuners that are adamant that the factory box is superior to anything aftermarket, with the bonus of reducing a little cabin noise. I've reintroduced it in my car too, albeit minus the snorkel.
John Forcier
EarlyS #1987
1968 911 Race Car "Grun Hilda"
1969 S/T interpretation "Blau Healer"
Restoration Saga
I am not sure what the supposed advantage of the snorkel is. Perhaps a cooler air source (probably not) or some kind of Venturi effect? The designers must have had something subtle in mind, that is lost in today's world of intercoolers and ram effects.
Member # 2633
Cars:
Porsche '68 - 911N (Sold)
Porsche 356B (T-6) S Coupe
Porsche 2008 C2 997 Cabriolet (Sold)
Porsche 2010 Gen.2 Boxster S
Small to large (decrease flow/pressure)
Length of snorkel (decrease induction noise)
Hence cut the snorkel and you can run with the same carb settings, but increased induction noise in the cabin.
I must admit the engineers were rather tricky for the day
Tony
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