Vehicle & Technical > Discovery
Snokel tops---turning them round?
Evilgoat:
--- Quote from: "mobi" ---i think you'll find it's the ram air thing some engines over air to fuel mix.(does that make sense?)
--- End quote ---
Its possible I guess but unlikeley. Not seen the holes on mine that abyssdj is on about. Had to fit a brain on mine asit really did collect a fair bit of water when facing forward in heavy rain. Normally it faces backwards.
Range Rover Blues:
Ram air is bunk, utter rubbish. Did an experiment with Tim M, it the effect is negligeable and certainly cannot overcome the extra restriction caused by the longer pipework that having a snorkel entails.
rollazuki:
Interesting subject.
Spent many an hour researching it when I was into bike tuning. basically a foreward facing funnel is the WORST thing imagineable as far as ram air is concerned. Effectively, it fills up, and virtually blocks off airflow.
Example: Air behaves like a fluid, take a funnel and a bath, and whoosh it thru the water, big end first. The water just pushes along, and very little pressure is generated at the thin end.
The best inlet is a smooth rounded opening, foreward or above the vehicle surfaces to avoid laminar air flow, that actually opens out gradually inside, after the opening, to create a pressurised plenum, from where the engine can draw its high pressure air.
Thus, a funnel shaped snorkel top, feeding into about 4 feet of pipe, with various bends etc is maybe the worst shape imagineable.
As another example, a Suzuki Hayabusa(1300cc) with ram air, was tested by a bunch of fellas in an article I once read. They tried to keep airbox pressure higher than atmospheric, on a dyno, with compressed air.
They ended up using 2 roadside compressors(them big yellow things that power pneumatic drills etc) and failed to keep the thing pressurised at full throttle!
Thats how much a well designed ram air can flow!!
Id say you would get a better result with it facing backwards over the roof, or maybe even better still at the bottom of the screen, where it can breath from the turbulent air rushing over the bonnet and hitting the screen bottom.......maybe......
Evilgoat:
--- Quote from: "rollazuki" ---
As another example, a Suzuki Hayabusa(1300cc) with ram air, was tested by a bunch of fellas in an article I once read. They tried to keep airbox pressure higher than atmospheric, on a dyno, with compressed air.
They ended up using 2 roadside compressors(them big yellow things that power pneumatic drills etc) and failed to keep the thing pressurised at full throttle!
Thats how much a well designed ram air can flow!!
--- End quote ---
The TL had the same SRAD system and yes it works great in that context. The current WS6 Trans-Am/Firebird also uses it in lieu of a supercharger.
Theres a big difference between a snorkel and these though.
bilge rat:
been out in bad rain which aint hard this year and checked the air filter to see iff any water has been sucked up. always bone dry. like said the safari top is designed to expell the water. blasting into deep water it does get very close to or into the snorkel top but is a little reckles doing this anyway. did see somewhere where someone tried turning it 180 degree round and when they braked the water in the rain gutter ran down & and was sucked up through the snorkel ?. the worst ive got mine was blasting down the a 14 in a storm plowing through water spraying it all over the n/s of the car. was without a snorkel and the filter was well wet. think iff ya carefull and check the filter after heavy rain use you'd be o.k. aparently k&n filter are better than the paper type of filter for keeping the water out . .. alan....
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