In article <firstname.lastname@example.org>, JD <jjd@SPAMLESS.com.au> writes
>> In article <email@example.com>, 'T'
>> <firstname.lastname@example.org> writes
>>>Just got a safari snorkel. Fitted wuth the top facing forward. But I see
>>>some people with them fitted with the top facing backwards. Why? Must be
>>>some reason to do it.
>>>(if you are going to clamp a black swan to your Land Rover wing, i reckon
>>>it's only fair to let it see where its going...)
>> Arguably you get less crud into the air filter with it facing backwards.
>> I can see it causing a low intake pressure at speed, but heck...
>> My one is a mushroom, but I'm tempted to put a baffle in to achieve the
>> same effect. I usually pick bits of straw out of the filter around
>> harvest time, so muck does evidently get drawn in as it is now.
>The snorkel is primarily to get the air intake up above the dust when
>operating in very dusty conditions. Assuming you have a diesel engine, the
>airflow into it will be such that anything round it will get sucked in
>regardless of the direction it is facing, so you might as well have it
>facing forward where you will get a slight boost in manifold pressure at
>speed rather than a slight reduction - help to make up for the friction
>losses of the longer intake and increased aerodynamic drag.
I take your point, especially about boosting the input pressure (and the
downtube isn't that wide - mine looks like a piece of rainwater
downpipe), but if something punctures the filter I think you may have a
bigger problem than low pressure.
Once a decent sized bit of rubbish gets into the pipe it'd be like doing
the Cresta run, and it will hit the filter with some speed. I'd have
thought the snorkel would be worse than an ordinary inlet for that,
partly because the length of pipe would encourage laminar flow and
partly because the smaller diameter would increase the velocity (for a
Having said that though, I don't recall dozens of failures through
airborne rubbish getting into the turbo, so perhaps it's moot.
SIMON MUIR, UK INDEPENDENCE PARTY, BRISTOL www.ukip.org
EUROPEANS AGAINST THE EU www.members.aol.com/eurofaq
GT250A'76 R80/RT'86 110CSW TD'88 www.kc3ltd.co.uk/profile/eurofollie/