XR2 Project... Update! (Cryfreeman might like this))

helpimcrap said:
before... air has nowhere to go essentially except being forced out the bottom of the engine bay.

*massive image*

and after... air goes out as car is going along by force of vacuum as air will be going through the front of the car and this air will be sucked out at the easiest point which will be through the opening in the bonnet. well the way i see it....

*another massive image*
Click to expand...

Did you read what I said about pressure?

*n
 
Following in the vein of MSPaint images:

pressurech0.png


*n
 
helpimcrap said:
i see your point.

still think i'm right though, and bigchez is kinda backing up my idea. ;)
Click to expand...

The front of the car is a high pressure area. The front of the bonnet is a low pressure area. The rear of the bonnet is a high pressure area. The windscreen is a high pressure area. Under the bonnet is a low pressure area.

A fundamental law of aerodynamics is that air will flow from a high pressure area to a low pressure area.

If you put a vent at the front of the bonnet, it will let air out. If you put it at the back of the bonnet, it will let air in.

*n
 
penski said:
The front of the car is a high pressure area. The front of the bonnet is a low pressure area. The rear of the bonnet is a high pressure area. The windscreen is a high pressure area. Under the bonnet is a low pressure area.

A fundamental law of aerodynamics is that air will flow from a high pressure area to a low pressure area.

If you put a vent at the front of the bonnet, it will let air out. If you put it at the back of the bonnet, it will let air in.

*n
Click to expand...

i know what you're saying about pressures. i seen that from the pic, i might appear an idiot but underneath i'm not that dense. ;)

however my theory is based on the fact that air/water/etc will follow the path of least resistance, and if there's less resistance by havign the bonnet open marginally then it will follow that path and encourage the air through the vents into the engine bay as the pressure will have dropped at the front due to air flowing freer thus allowing more air to be directed at the front as the pressure will be less.

i apologise if i'm sounding confusing. i have it right in my head but it's trying to explain it. your principle is in essence the ram air effect which does work and i do understand. still think i'm right though. ;)
 
Surely where is and is not a high pressure area depends on the exact aerodynamics of the situation. The high speed moving air over the top of an aerodynamically efficient car will generate regions of low pressure rather than areas of high pressure.

It is entirely feasible that by lifting the rear of the bonnet up slightly you alter the airflow in such a way that it lowers the air pressure at the back of the engine bay thus drawing through more air.
 
helpimcrap said:
i know what you're saying about pressures. i seen that from the pic, i might appear an idiot but underneath i'm not that dense. ;)

however my theory is based on the fact that air/water/etc will follow the path of least resistance, and if there's less resistance by havign the bonnet open marginally then it will follow that path and encourage the air through the vents into the engine bay as the pressure will have dropped at the front due to air flowing freer thus allowing more air to be directed at the front as the pressure will be less.

i apologise if i'm sounding confusing. i have it right in my head but it's trying to explain it. your principle is in essence the ram air effect which does work and i do understand. still think i'm right though. ;)
Click to expand...

You don't sound confusing...you're just confused.

I'm not talking about ram air...which is a myth anyway.

I don't know how many different ways I can say this but here we go again:

Air ALWAYS flows from a high-pressure area to a low-pressure area (your notion of 'path of least resistance' is flawed - a high-pressure area gives a ****load of resistance ;))

The front of the windscreen/back of the bonnet is a high pressure area.

Under the bonnet is a low pressure area.

*n
 
helpimcrap said:
they dont do one with the bonnet raised though to compare so it's null and void. :p

and anyways what does an old 80's mazda have to do with an er.... forget it. :o
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Do you want me to go and get an aero engineer (time served in group C and Formula One) to tell you the same thing that I keep saying?

*n
 
penski said:
Do you want me to go and get an aero engineer (time served in group C and Formula One) to tell you the same thing that I keep saying?

*n
Click to expand...

no need. had a chat with an automotive engineer and she said i was wrong.

wasn't go to let you know that thought. she told me at about 10pm. ;)
 
[TW]Fox;10748941 said:
The Rover is simply a badly built banger, the Escort RS Turbo is beginning to gain classic status. There is a slight difference.
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Does it being a classic suddenly make all the rattles disappear then ? :p

The Rovers of the early 90s were miles better than the late 90s stuff. Honda Engineering behind most of them and were certainly some of the best built in their class.
 
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