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Sambafraser
Samba Member
Joined: March 05, 2009
Posts: 248
Location: Hel Finland
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 Posted: Sun Mar 31, 2013 11:28 am Post subject: |
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So you have your heart set on the bilge pump in a tube running the length of the van.
I think it will catch fire.
Wanna know why? You have a bigger volume fan powered by your engine. You will be driving along the road with a inlet that will be larger than the diameter of your tube which multiples the volume of air going into it.
Plus you are sticking it in the airstream at 100kph in a dirty place which it isn't designed to do.
Then to add to this you have the inlets on the side of the van which are about 8 times the size of the tube you are using acting as an vent as they are in the smooth air stream along the side of the van exhausting air out sucking air against your engine fan - Like taking your finger off a bong vent.
This will cause the fan in the tube to run at a very high speed.
So question is do you know why the rear vents on the Vanagon are recessed into the bodywork? |
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flemcadiddlehopper
Samba Member
Joined: December 05, 2011
Posts: 2332
Location: Kelowna, BC. Canada.
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| Posted: Sun Mar 31, 2013 3:43 pm Post subject: |
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| Sambafraser wrote: |
So you have your heart set on the bilge pump in a tube running the length of the van.
I think it will catch fire.
Wanna know why? You have a bigger volume fan powered by your engine. You will be driving along the road with a inlet that will be larger than the diameter of your tube which multiples the volume of air going into it.
Plus you are sticking it in the airstream at 100kph in a dirty place which it isn't designed to do.
Then to add to this you have the inlets on the side of the van which are about 8 times the size of the tube you are using acting as an vent as they are in the smooth air stream along the side of the van exhausting air out sucking air against your engine fan - Like taking your finger off a bong vent.
This will cause the fan in the tube to run at a very high speed.
So question is do you know why the rear vents on the Vanagon are recessed into the bodywork? |
Good point, the fan will be spun by the pressured air at speeds that would exceed 4 times what it was designed for. I'll put a brake on it.
I am not a tailgater on a dirt road, so why is the front of the bus dirtier air than what is behind your own wheels?
My guess about the vanagon vents... Vanagons suck, but that is besides the point your about to make. Smooth air flow? Turbulent air flow? Who hops up a Vanagon?
If VW designers had such huge fore thought as to design the air vents in the bus to be at 225% above the normal usage, and that they expected people to put large displacement engines in their buses, why did they only make the speedo go to 80mph?
Gordo.
_________________
Everybody Dies....Some Never Live.
Retrograde Garage. Vintage Aircooled, and others. |
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Sambafraser
Samba Member
Joined: March 05, 2009
Posts: 248
Location: Hel Finland
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| Posted: Mon Apr 01, 2013 8:51 am Post subject: |
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So how will you know how fast it the fan is running?
If you brake it then it will produce heat 
As for the fore thought of the 50's design, well the fact that punters are getting 200hp out of something that was designed for 40hp 50 years ago and they aren't overheating should answer your question. |
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