dandaz said:
luke said:
dandaz said:
when I was watching the bays in the tour de france coming down the hill [well mountain]they all had their decklids open..
I am convinced when driving up inclines etc it`s a good thing ,in traffic jams no...
I disagree, no more cold air will be sucked by opening the decklid, the rear vents are hardly restrictive and if anything their scooped design should pressurise the upper half of the engine bay slightly.
See I don`t buy this pressurising , because behind my fan in the singlecab is a huge open space it would be impossible to even slightly pressurise it...
I have seen or heard lots of bay findinding it hard over the hills ,too much work =not enough speed ,these bays had already flew over the Alps and where into the pyraneese ,me thinks it is a good idea ,my decklid was open and the engine thanked me... 8)
:lol: :lol: :lol: It genuinly amuses me the amount of old wives tales and myths that develop. It has got much much worse with the rise of the internet, where new ones keep sprouting up and then get repeated by others at an exponential rate.
For example :- Its taken years and many thousands of words, posts, arguments and flamings to finally get some of the VW aircooled owners to accept that throwing away the stock distributor and replacing it with an 009 is not an improvement or a way of making it go faster. The only time an 009 would be an improvement is when the original is very badly worn and a correct replacement is un available.
I know its tempting but just because its an old vehicle doesent mean you can just ignore the manufacturer and make up new recommendations of your own. I was involved with these vehicles, working for Volkswagen Technical at the time these vehicles were being developed and produced.
Please dont start another myth.
Just because you see some stupid people running around with the engine lid open doesent mean its a good idea. Monkey see monkey do.
If we had found that taking the cooling air from the rear worked then we would have built them with grills in the engine lid and we could have saved ourselves the cost, space and complexity of building the vehicles with the air scoops high on the side of the vehicle. Those scoops are not a fake "go faster" styling feature to make the bus look good.
The scoops are there to ensure the air for the engine is as cool and dust free as possible.
There is a rubber seal on the rear engine lid to prevent hot air, exhaust gases and dust from being drawn into the engine. Leaving the engine lid open has a similar effect to leaving some of the tinware off, in that it allows hot air from under the engine to be drawn back in. Dust not only causes premature clogging of the air filter but can also collect in the cooling system fins and reduce their ability to dissipate heat.
The scoops do cause a small but measureable amount of ram air effect at speed. This positive pressure is not enough to significantly affect engine performance but it is enough to cause slight positive pressure which stops the fan sucking past the engine seals.
People who leave their engine lids open clearly have no understanding of how the air flows over, round and under a moving vehicle - I would have thought the seal round the engine and round the engine lid might give them a clue - but apparently not enough for those with IQ's in the double figures.
