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Nic Jarman
Joined: 05 Oct 2008
Posts: 1031
Location: Stoke by Clare, Suffolk
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 Posted: Tue Aug 24, 2010 10:14 am Post subject: |
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Jim, are you trying to explain the concept of negative pressure and pressure differential? Good luck, rather you than me. 
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1936 Morris 8 Series 1
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Jim.Walker
Joined: 27 Dec 2008
Posts: 1229
Location: Chesterfield
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| Posted: Tue Aug 24, 2010 11:02 am Post subject: |
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| Nic Jarman wrote: | | Jim, are you trying to explain the concept of negative pressure and pressure differential? Good luck, rather you than me. |
Just prompted by the mention of blocking off the air vent in an earlier posting Nic. Which I thought some people might see as a possible cure!
You mention "pressure differential". I did not!
My experience as a Motor Vehicle Lecturer taught me that very few people could get away from the "suck" idea with no relevent connection to ambient pressure (in most cases - without a blower and pressurised float chamber - atmospheric pressure). 
With regard to "negative pressure" there is no such thing. Unless atmospheric pressure can be considered to be zero.
Jim.
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Nic Jarman
Joined: 05 Oct 2008
Posts: 1031
Location: Stoke by Clare, Suffolk
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| Posted: Tue Aug 24, 2010 12:59 pm Post subject: |
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Often change the possition that things are viewed can help. I grew up with a research scientist father and a science teacher mother, what a nightmare! Remmember, the concept of a gravitational pull strong enough capture light was unthinkable not so long ago. Maybe someone will discover something that will be called negative pressure in relation to a vacuum. I was using the CONCEPT of one pressure being lower than another to emphesise the flow direction. I never did much like the transmission line analogy of an endless tunnel, I could grasp the idea of matched impeadence. If it works to help understanding then so be it.
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1936 Morris 8 Series 1
1973 MGB roadster
1977 MG Midget 1500
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Rich5ltr
Joined: 28 Mar 2008
Posts: 680
Location: Hampshire, UK
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| Posted: Tue Aug 24, 2010 2:09 pm Post subject: |
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Anyway, the breather holes are not blocked I think it's just sticky vales which I will replace for £6.00 each!  |
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Penman
Joined: 23 Nov 2007
Posts: 4764
Location: Swindon, Wilts.
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| Posted: Tue Aug 24, 2010 7:32 pm Post subject: |
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Hi
Seeing the discussion of all these physics concepts reminds me of the Centrifugal - centripetal thing where most people seem to mean the latter when they use the former
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Jim.Walker
Joined: 27 Dec 2008
Posts: 1229
Location: Chesterfield
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| Posted: Tue Aug 24, 2010 10:56 pm Post subject: |
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| Penman wrote: | Hi
Seeing the discussion of all these physics concepts reminds me of the Centrifugal - centripetal thing where most people seem to mean the latter when they use the former |
Now you have made me remember being a student at the local Tech. Where the part time science Lecturer made a great shout about centrifugal and centripetal forces. He lost a great deal of our faith in him when he tried to prove that a motorcyclist must lean at a certain angle, given the speed and radius of the corner to maintain his balance. Nothing wrong with that? Well we never did convice him that the 'biker had to lean inwards NOT OUTWARDS!
Jim.
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Quote from my late Dad:- You only need a woman and a car and you have all the problems you
are ever likely to want". Computers had not been invented then! |
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Nic Jarman
Joined: 05 Oct 2008
Posts: 1031
Location: Stoke by Clare, Suffolk
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| Posted: Wed Aug 25, 2010 12:40 pm Post subject: |
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I leaned outwards a few times and I have the scars to prove it.
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1936 Morris 8 Series 1
1973 MGB roadster
1977 MG Midget 1500
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