Whats the best type of snorkel moulded or tube

[dave willard]

I will be getting a snorkel for my new 300tdi 90

Looking there seem to be a lot around mainly the moulded one piece & the tube metal/plastic with felexible joints

Anyone know which might be better
Dave

[Dave]

The moulded one piece cuts your BHP down less than the older style metal one does.
Dave

[dave willard]

The moulded one piece cuts your BHP down less than the older style metal one does.
Dave

Hi
Do they cut the power much

The CSA will be bigger on the moulded which should possibly explain the less p[ower loss
DAVE

[Dave]

A few years back for the magazine we did some performance checks on a rolling road, adding a high flow filter, silicon turbo pipes, better exhaust etc etc. The safari type snorkels cut bhp down by around 5bhp, the standard Land Rover metal one about 8bhp if I remember. I've still got the figures somewhere I think.
Dave:

[tecnick]

Do those figures change as the vehicle gets up to speed? Testing on a rolling road would not emulate this would it?

Just a thought Nick

[Dave]

No the bhp figures stayed the same, so no road speed wind blowing into a safari snorkel like yours with the air intake facing forward (or as many would say the wrong way, allowing dust and water into the filter). The later mantec 'plastic' snorkel did better with a less bhp drop if i remember.

[nicks90]

i wonder if those results would be the same if the engines had retained the standard more restrictive air filter and exhausts?

[Dave]

The snorkel test figures were done with standard filter and exhausts etc, we only tested one modification at a time, the idea being to get a figure for each modification on its own. I'm sure we must have done a bhp test with all the mods done I'm still looking for the figures.
Dave:

[Matthews]

If you use basic physics and basic common sense then unless the diameter is huge any form of ducting prior to the turbo inlet will cause a restriction , the longer the ducting (i.e snorkel over standard short intake pipe from wing) the greater the restriction, the more bends in the ducting will also have a similar effect , it's not rocket science for gods sake !
Matthew