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Aug 11, 2011 11:06:29 GMT
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For my starion project ive just bought a brand new truck intercooler that measures 28inches square  I know its never going to mount at the front, so what I'm thinking is top mount, but with a difference. Instead of having a bonnet scoop, have a scoop below the intercooler ( between the inercooler and engine) that catches the air at the front of the car, and forces the air up through it then the bonnet would be cut and raised so the air can flow out the back. ( imagine an oversize stretched impreza scoop, each pointing in the opposite direction with an intercooler sandwiched between them. Can anyone think of any reason not to ? From an aerodynamic point there should be no problem afaik but some input would be nice  |
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Aug 11, 2011 11:37:01 GMT
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aerodynamically - it wouldn't work.
A very strange place, the base of the windscreen, as it's a high pressure zone, which will flow INTO any holes (rearward facing ones too) once above 40mph-ish. You'd end up with air being forced into the front, AND the back, with not a lot of through-flow
If you don't mind having heat-soak issues, intercooler on top of the engine, ducted down the back of the engine, with either a front or rear mounted scoop. I'd reccomend a large fan too, to try and stave off the dreaded heatsoak
If you had it mounted vertically on top of your bonnet, that would work. Visibility may be a tad impared though ;D
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You're like a crazy backyard genius! |
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Aug 11, 2011 11:45:38 GMT
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EH ! high pressure zone ?
i think you will find its a low pressure zone
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Aug 11, 2011 11:53:38 GMT
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wonder why these scoops are so popular...  |
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scruff
Part of things
Posts: 621
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Aug 11, 2011 11:58:04 GMT
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Any room down the sides of the engine bay? Duct air from below at the front.
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1994 Lotus Esprit - Fragile red turbo with pop up lights.
1980 Porsche 924 - Fragile red turbo with pop up lights.
I spy a trend...
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conrad
Posted a lot
Here to fix your cabin.......
Posts: 1,678
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Aug 11, 2011 12:32:17 GMT
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You coulg go mental and put your rad in the back with big powerful fans like we do in autograss cars over here. But you'd need some kind of ducting to bring colder air into the back, as it only really works for autograss machines because they've got no glass. It's look seriously harcore though
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Aug 11, 2011 13:08:25 GMT
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Last Edit: Aug 11, 2011 13:25:47 GMT by chairchild
You're like a crazy backyard genius!
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bortaf
Posted a lot
Posts: 4,549
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Aug 11, 2011 13:32:40 GMT
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EH ! high pressure zone ? I think you will find its a low pressure zone No high, thats how the air gets forced into the heater system on most cars from the scuttle, the air has to change direction up and over the screen and that makes it a high pressure area, a lot of tuiners use the sctuttle area for a ram efrfevt by placing the intake to the airbox there. And as above thats why bonnet scoops have the inlet to the rear near the screen . |
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Last Edit: Aug 11, 2011 13:34:13 GMT by bortaf
R.I.P photobucket
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Aug 11, 2011 14:17:52 GMT
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from a standard point of view, but adding a mod to the bonnet like the one pictured above will create a depression just after the exit and will suck the hot air out, basic aerodynamics  and conrad the rad is already going to be in the boot, i have ducts to replace the rear quarter windows, with my engine/turbo setup there is not alot of room so major relocation of everything is needed |
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Aug 11, 2011 14:36:49 GMT
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Guessing you didn't see the air-tunnel pics I put a link to then eh? air hits bumper, gets split up and down. What gets diverted up, goes over the bonnet, creating a low pressure area just after the bonnet starts (depending on angle of bumper/bonnet) Air continues until it meets the windscreen, and it's forced to make a sudden change of angle. With no easy route to take, pressure builds at the base of the windscreen, and the added turbulance essentially keeps the air circulating at the base of the windscreen. Adding anything like that large reverse-scoop in front of it, merely creates a small area of stagnant air directly behind it - effectively increasing the static air pressure, as the rest of the air is coming at high speed (ventuuri effect)    red = high blue = low |
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Last Edit: Aug 11, 2011 14:40:26 GMT by chairchild
You're like a crazy backyard genius!
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RobinJI
Posted a lot
"Driven by the irony that only being shackled to the road could ever I be free"
Posts: 2,995
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Aug 11, 2011 16:14:51 GMT
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Chairchild's right, it's well documented and well proven to be a high pressure area, even if you put a scoop there it'll still be high pressure. Venting it out of the front section of the bonnet would be the best option if there's space, like the vents in the bonnets of the T16 pugs, although if I suspect you don't have space there, as iirc that's pretty much where the turbo's going isn't it?
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Aug 11, 2011 18:14:12 GMT
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on a standard car yes. But il be adding a reverse scoop kind of like the one above, slightly more angular and a tad higher. It wont be right at the very rear of the bonnet, it will end a good few inches from the rear,( look at the pic of the sport car with the bonnet bulge) and the air travelling over it will be moving faster than the air below thus creating a low pressure area directly behind it, well before the windscreen. Yeah the turbo will be right at the front of the engine, here is a link to the intercooler so you know the size and you can see its not going anywhere else other than top mount. www.driftworks.com/forum/parts-sale-private-sales/153425-giant-intercooler.html |
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Aug 11, 2011 18:32:46 GMT
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Why not go down the route I did with my turbo'd Subaru Brat pickup,I ditched the top mount intercooler due to horrific intake temps & fitted a charge cooler instead!
The benefits I gained was an extra 2lb of boost & my intake temps went from 52 to 34 degrees celcious.....
I've since fitted an electronic boost controller & it's now running 1.27 bar of boost giving me 356bhp too!
Tim
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Last Edit: Aug 11, 2011 18:33:44 GMT by Brat-Man
1974 Chevrolet C20 Camper Special Pickup Truck 2002 Fiat Multipla oil burner SOUTHWEST SWAPMEET southwests best car parts selling page on facebook for retro/custom/classic www.facebook.com/groups/249875865097198/ |
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Aug 11, 2011 18:36:39 GMT
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space. with everything i need to cram into the engine bay, finding space for the rad and associate pipework would be even more of a nightmare !
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RobinJI
Posted a lot
"Driven by the irony that only being shackled to the road could ever I be free"
Posts: 2,995
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Aug 11, 2011 18:39:10 GMT
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The Ferrari with the bonnet bulge is creating a low pressure in that area because the air is having to travel the extra distance over the bulge, hence why the low pressure is directly over the top of it, not at the rear edge. I'd suggest that unless your outlet is significantly further forward, like at least a 3rd of the way down the bonnet, then the area behind it will likely fill with high pressure caused by the screen, like it has behind that Ferraris one. I'd be guessing the best set-up in the space would be to duct the air to the underside of the intercooler from the standard grille, and then exit it from the bonnet through an outlet something like this:  The air will exit much better if its being drawn from around that area of the bonnet. Even if a shaped scoop was able to create a marginally lower pressure, it'll still be fighting the high pressure caused by the screen, and it makes more sense to work with the cars natural aerodynamics, than to try and fight them. Or like Tim says, running a chargecooler could work. The radiator for it could be run in the boot along with your engine coolant radiator, and I really can't imagine the cooler it's self taking up more space than that intercooler! |
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Last Edit: Aug 11, 2011 18:41:54 GMT by RobinJI
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Aug 11, 2011 18:56:32 GMT
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robin, if you read my post i did actually say thats what i was going to do with the intercooler.
Tat top pic, but mounted upside and reversed under the intercooler, the scoop catches the air and pushes it upward through the intercooler, then flows out of the intercooler and bonnet from the scoop that will be the right way around.
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Aug 11, 2011 19:14:35 GMT
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Last Edit: Aug 11, 2011 19:16:18 GMT by chairchild
You're like a crazy backyard genius!
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RobinJI
Posted a lot
"Driven by the irony that only being shackled to the road could ever I be free"
Posts: 2,995
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Aug 11, 2011 19:41:16 GMT
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I know what I was describing was the same underneith, I meant the vent in the bonnet, you said:
"it then the bonnet would be cut and raised so the air can flow out the back. ( imagine an oversize stretched impreza scoop, each pointing in the opposite direction with an intercooler sandwiched between them."
Which implies you were wanting to make a big scoop, facing rearwards exiting at the back of the bonnet, not a vent in the front 3rd of the bonnet, which is what I was describing. I guess I didn't really describe what I was talking about properly.
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Aug 11, 2011 20:12:49 GMT
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space. with everything I need to cram into the engine bay, finding space for the rad and associate pipework would be even more of a nightmare ! I used a heater matrix radiator which takes up very little room & rubber hose for the pipework buddy.... |
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1974 Chevrolet C20 Camper Special Pickup Truck 2002 Fiat Multipla oil burner SOUTHWEST SWAPMEET southwests best car parts selling page on facebook for retro/custom/classic www.facebook.com/groups/249875865097198/ |
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Aug 11, 2011 22:06:55 GMT
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quick question, what kinda pumps are people using for chargecoolers? Very tempted to convert an old intercooler core to a chargecooler myself....
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You're like a crazy backyard genius!
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