Thread: Snorkel heads.

Originally Posted by W&KO

Is there a speed where is changes from neg to pos?

Not one I’d like to find in a Defender.

Originally Posted by Tombie

Not one I’d like to find in a Defender.

Originally Posted by Tombie

Not one I’d like to find in a Defender.

Oh, so even at 100km/hr on full throttle it’s would still neg pressure

If you do some ball park calcs of Dynamic head generated by the air at 100 km/hr, you get an increase in pressure of 0.07 psi.
Even if you quadrupled that due to body effect of the Defender and the change of area from the opening of the to the down tube (?), you still only get 0.24 psi and I reckon that would be generous compared to the reality.
Would that be enough to notice a performance change ?

Cheers Glen

Originally Posted by trout1105

If you have a boat with a water pick up fitted for your bait tank/deck wash have a look at where the inlet is facing and you will find that it is facing forward, The same principle applies to a ram head on a snorkel I would suggest.

I think the density of water vs air is slightly different. With air being less dense, other factors such as friction at bends become more significant.

Originally Posted by W&KO

Oh, so even at 100km/hr on full throttle it’s would still neg pressure

At WoT it is struggling to get the air it wants at any Speed.

The 90 is well mannered to about 150km/h it starts getting interesting above that, but it will go there (limiter is removed)

Originally Posted by cjc_td5

I think the density of water vs air is slightly different. With air being less dense, other factors such as friction at bends become more significant.

Regardless of the density difference the same laws of physics apply.
IF rear facing air intakes were a better option then why are they forward facing on aircraft engines

Originally Posted by trout1105

Regardless of the density difference the same laws of physics apply.
IF rear facing air intakes were a better option then why are they forward facing on aircraft engines

Why do many rigid trucks have them facing rearwards, and are at the rear of the cab?

And a plane goes a hell of a lot faster than any vehicle, therefore ram pressure would be a lot more.