Forced Cold Air Induction
#31
Posted 17 June 2008 - 01:04 AM
"Much easier to just raise the bonnet up an inch or so at the back, this sucks air in directly above the carb. "
As you can see on the above pic, where there is red indicates high pressure areas, and theres one at the base of the screen as you see. If the rear edge of the bonnet was raised, without aerodynamic add-ons the high pressure would just keep the warm air in place under the bonnet. The other red areas though are good, the one at the front will be forcing air through rads/cooler etc and the one on the rear wing will keep the rear end planted.
the air doesn't flow cleanly over this area and carry heat away and over the roof, instead when it reaches the edge of the bonnet it basically swirls about in place and doesn't really disperse any heat. It does slowly filter out round the sides of the screen/car, but nowhere near quickly enough to be benificial in anyway whatsoever.
Although this is more relative to heat dissapation, it essential means that it could well raise engine temps and give the carb warm air instead of fresh cold air
#33
Posted 17 June 2008 - 11:31 AM
The point to grasp is the engine will have the biggest effect on airflow, its ability to suck air in will be far greater than any crafty attempts to direct airflow generated by the vehicle speed. Reducing obstructions in the path of the air going down the carb throat is what it's about. Mighty's piccies are interesting. I wonder what similar images of a Mini would reveal? The screen is a lot steeper and the bonnet is nearer the horizontal and less long. It could be the bonnet's front develops a bow wave and there's an eddy behind it. I'm sure we've all watched the wipers try and creep up the screen when you finally persuade one of the little Bu**ers to go a motorway speeds. I always thought the tilted bonnets were a bit of a lazy fix for not been quite able to squeeze components underneath and if it lets heat out at low speed without actually disrupting airflow then it would still be worthwhile.
#34
Posted 21 June 2008 - 07:34 AM
I must admit, after reading Lund's thread on here I did take a trip to the tip and this was the result (a hoover pipe directed to the grille) and it works damn well and sounds far more refined than before. Thanks Lund!
Edited by twiggy, 21 June 2008 - 07:34 AM.
#35
Posted 21 June 2008 - 07:51 PM
I went out and tried this with my car and its deffinatly made a difference. Im using an old 60mm pipe i had from an extractor duct, run straight from the ports to the grille. I dont really know why i hadn't done this sooner!!
[/sarcasm]
#36
Posted 21 June 2008 - 07:52 PM
[sarcasm]
I went out and tried this with my car and its deffinatly made a difference. Im using an old 60mm pipe i had from an extractor duct, run straight from the ports to the grille. I dont really know why i hadn't done this sooner!!
[/sarcasm]
#37
Posted 22 June 2008 - 10:19 AM
#38
Posted 22 June 2008 - 10:43 AM
I must admit, after reading Lund's thread on here I did take a trip to the tip and this was the result (a hoover pipe directed to the grille) and it works damn well and sounds far more refined than before. Thanks Lund!
If you want to improve the airflow and bypass any induction heating (as that pipe does) you may as well remove the temp control valve and stick the pipe in the end of the filter case.
#39
Posted 22 June 2008 - 03:28 PM
6 Kudso for dave
#40
Posted 24 June 2008 - 10:43 PM
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