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Location:
Townsville, QLD, Australia
Registered:
June 2005
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Putting on a scoop.
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Fri, 15 July 2005 13:53
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I like the look of a tasteful bonnet scoop and feel that my car could use one 
Now what I need to know is:
- How do I attach it?
- How do I cut the hole in the bonnet?
- What do I need to stop it from rusting?
- Will water go down it? and if so what will happen then?
- Am I just better off putting one on for show rather than actually using it for its venting qualities?
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Location:
Montrose, VIC
Registered:
May 2002
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Re: Putting on a scoop.
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Fri, 15 July 2005 14:02
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What kind of car, what kind of scoop...
If you're planning on putting a forward facing scoop that is attached to nothing on just any car, chances are you'll feed air under the bonnet where it isn't wanted, increase pressure, and harm ventilation (not that I'm picking on people who put a WRX scoop on their Lancer/Hyundai... am I?) Instead, a properly placed bonnet VENT to remove hot air might be more useful - only use a scoop when you have something to feed (engine air intake, top mount intercooler), or want to look like a generalised tool.
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Location:
Townsville, QLD, Australia
Registered:
June 2005
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Location:
Sydney / NSW
Registered:
March 2004
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Re: Putting on a scoop.
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Fri, 15 July 2005 14:37
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its all depends on what kind of scoop really, you can just get bolt on scoop which is quite easy to put on.
but if you decide to get a moulded one then you will need to cut a hole in the bonnet with an angle grinder and treating the edges with paint so it doesnt rust, the scoop will be best put on with polyeurothane so it stick quite strong and put some putty around the edges to blend it in with the rest of the bonnet, and then obviously paint it.
water entering the engine bay shouldnt harm it, but i wouldnt put the hole above the dizzy or the spark plugs.
in my opinion if you dont need one , then just get a bolt on one for looks.
Karl
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Location:
Bundaberg, Qld.
Registered:
May 2002
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Re: Putting on a scoop.
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Fri, 15 July 2005 14:45
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| mrshin wrote on Sat, 16 July 2005 00:02 |
If you're planning on putting a forward facing scoop that is attached to nothing on just any car, chances are you'll feed air under the bonnet where it isn't wanted, increase pressure, and harm ventilation (not that I'm picking on people who put a WRX scoop on their Lancer/Hyundai... am I?) Instead, a properly placed bonnet VENT to remove hot air might be more useful - only use a scoop when you have something to feed (engine air intake, top mount intercooler), or want to look like a generalised tool.
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perfect. couldnt of said it better.
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How do I attach it?
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best way is a with screws through from the underside of the bonnet into metal tabs that should be in the scoop.
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How do I cut the hole in the bonnet?
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air saw is best, but a jigsaw will do the job just as good. just dont cut through any of the underside bonnet bracing or you'll have legality issues.
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What do I need to stop it from rusting?
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prime and paint the exposed metal after you've cut the hole.
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Will water go down it? and if so what will happen then?
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think about it. you've got a big hole facing forwards, what will happen when it rains? water normaly wont effect an engine bay/engine, unless it happens to go into your electrics, dist etc.
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Am I just better off putting one on for show rather than actually using it for its venting qualities?
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it sounds like you want it for show anyways, facing it forward like mentioned above will not be venting your engine bay.
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Location:
Brisbane
Registered:
May 2002
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Re: Putting on a scoop.
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Sat, 16 July 2005 07:19
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A rear-facing scoop might have a chance of being at least partly functional, as it will help draw air out of the engine bay instead of trying to stuff it in. Remember it's easy getting air into the engine bay, getting it out is the hard part!
Personally I think it will look awful whether facing forwards or backwards, but that's a question of taste I suppose...
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Location:
Bundaberg, Qld.
Registered:
May 2002
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Re: Putting on a scoop.
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Sun, 17 July 2005 05:34
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the one i made for my feroza is rearward facing to help vent hot air out of the engine bay, need it specialy once i get the turbo in there.. 
http://www.cardomain.com/ride/657917/3
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Registered:
June 2005
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Re: Putting on a scoop.
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Sun, 17 July 2005 07:48
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what would happen if you just shoved a scoop on (front mount) would this fuck up the areodynamics or cause my bonnet to bend or anything?
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Location:
Melbourne
Registered:
May 2002
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Re: Putting on a scoop.
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Sun, 17 July 2005 08:07
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When we did the scoop for my gze we had to cut the center support out... But basically after the hole was cut the bonnet was quite flimsy, so we used sikaflex around the bracing of the hole and also reattached the frame to the skin where the original adhesive had come off...
This made it quite rigid again, then the scoop was bolted on... unfortunately making it rigid made it dip in the center so it looks a bit shite, but meh, not buying a new bonnet and scoop for a looong time 
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Toymods Club Treasurer
Location:
Sydney
Registered:
May 2002
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Re: Putting on a scoop.
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Sun, 17 July 2005 08:46
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My suggestion would be to try to measure where the hot spots are under your bonnet.
Then fit vents to these spots. the air passing over the bonnet creates a sucking effect with will draw the hot air form your engine bay increasing cooling.
Bonnet scops purely for looks are ghey.
I'm trying to fit one to my late 80s subie with WRX motor fitted & was avoiding the WRX version because of all the tossers with them on their Excels & Festivas.
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Location:
Somewhere on a dirt bowl ...
Registered:
August 2004
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Re: Putting on a scoop.
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Sun, 17 July 2005 09:48
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And what kind of scoop are we are telling about ?
WRX, GT4, Hornet, Nissan Narva ute, Ice cream, Torana.........
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Toymods Club Treasurer
Location:
Sydney
Registered:
May 2002
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Re: Putting on a scoop.
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Sun, 17 July 2005 09:52
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| towe_001 wrote on Sun, 17 July 2005 19:48 |
And what kind of scoop are we are telling about ?
...,Ice cream, .........
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2 to go please...
Should keep an intercooler cool though.
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Location:
Kings Langley, Sydney
Registered:
July 2004
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Re: Putting on a scoop.
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Sun, 17 July 2005 13:29
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might be a really silly and stupid question, but what about using washers to raise the rear of bonnet. With the use of a front facing scoop would this force the air out the back of the bonnet?
Puts on flame proof suit!
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: Putting on a scoop.
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Sun, 17 July 2005 14:09
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as discussed previously (and pics posted twice) the base of the windscreen is a relatively high pressure region, and raising rear of bonnet may not actually help, but hinder venting.. ideal place seems to be about 2/3rds of the way along th ebonnet, ie after front high pressure, but before windscreen high pressure region.
the prob is that there is a massive amount of air coming thru the radiator, but it is difficult to remove it.. need to either exclude air from under engine bay or provide low pressure vents on tp (celica GT4 are ok.. has raised bit before vent to give a small localised low presure region). by puttign a front facing scoopm you are just introducing mroe air into engine bay.. while it may help force more air out thru the rear of raised bonnet, this increased enginae bay pressure could decrease the amount of air going thru the radiator.... lower engine bay temps, higher radiator temps....
bestest way is to have front air dam that sucks air out from underneath, or well placed rear facing vents on bonnet...
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Location:
Bundaberg, Qld.
Registered:
May 2002
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Re: Putting on a scoop.
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Sun, 17 July 2005 21:44
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| oldcorollas wrote on Mon, 18 July 2005 00:09 |
bestest way is to have front air dam that sucks air out from underneath, or well placed rear facing vents on bonnet...
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dunno if i would want more air than normal being taken under the car, could premote front end lightness at speed. lots of mid mount cars have a bonnet vent to take air out through the radiator and up over the bonnet to help front end downforce.
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Registered:
June 2005
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Re: Putting on a scoop.
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Mon, 18 July 2005 03:27
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wouldnt you have to be travelling at considerably speeds to worry about a scoop affecting the down force on your front end?? but then again i'm not a areonaughtical engineer perhaps we should get one in to answer all our problems
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Location:
Bundaberg, Qld.
Registered:
May 2002
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Re: Putting on a scoop.
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Mon, 18 July 2005 10:01
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| NUT_54C wrote on Mon, 18 July 2005 13:27 |
wouldnt you have to be travelling at considerably speeds to worry about a scoop affecting the down force on your front end?? but then again i'm not a areonaughtical engineer perhaps we should get one in to answer all our problems
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bonnet vents of the right design 'help' with the front end downforce of certain cars, like F50's, lotus elise etc.
i made a small one for the feral, it isnt as large as i would like, i would prefer to go into the frunk area to give a more gradual flow for the air that will come in behind the radiator and over the bonnet. but i cant with my subs in there.
 
bonnet enginbe bay heat exctraction scoops/vent are different.
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