Raised Bonnet....?!?!! - Corsa Sport - for Vauxhall and Opel Corsa B, Corsa C and Corsa D

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M666TT C

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Registered: 17th Jun 08
Location: Orpington, Kent
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16th Jul 08 at 23:57

I have seen loads of corsa's and loads of other cars with the back end of the bonnet raised to "aid cooling"......

how the hell do they do it?!?! lol.. anyone willing to explain with pics.... as im considering it......

cheers in advance

Limecat

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Registered: 25th Jun 05
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17th Jul 08 at 00:03

By raising the rear edge of the bonnet it creates an area of negative pressure below the bonnet level, that means that the air passing over the bonnet (positive pressure) creates a difference which helps to draw anything below that trailing edge of the bonnet out from the bay. It is very negligable TBH.

M666TT C

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Registered: 17th Jun 08
Location: Orpington, Kent
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17th Jul 08 at 00:08

ahhhhhh... makes sense...

but i sorta meant.... how do they do it??

as in.... how do you raise it up? i thought it was using washers or something... can anyone shed some light on this?

harrisp

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Registered: 15th Dec 07
Location: Derbyshire
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17th Jul 08 at 00:17

raiser blocks between the bonnet and hinge and longer bolts.

M666TT C

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Registered: 17th Jun 08
Location: Orpington, Kent
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17th Jul 08 at 21:10

that makes a hell of a lot of sense... or not...

any more info please lol

Dave A

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Registered: 10th Dec 03
Location: County Durham
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17th Jul 08 at 21:21

ill see if I can get pics of mine....

Kenzie

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Registered: 16th Sep 07
Location: Burnley
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18th Jul 08 at 14:19

Would be very helpfull that Dave.

My mate has done this on his starlet turbo, but ges just used washers, but cant do that on a corsa bonnet

bieransri

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Registered: 13th Apr 06
Location: Kidsgrove, Staffordshire
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18th Jul 08 at 19:41

you have to make 4 brackets, that lengthen where the holes meet, like a domino out of aluminium. and then bolt it up on the existing hinge + bonnet holes

bieransri

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Registered: 13th Apr 06
Location: Kidsgrove, Staffordshire
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18th Jul 08 at 19:48

bit like this

Wizard1906

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Registered: 17th Jan 08
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18th Jul 08 at 22:00

i wouldnt recommend this at all just think what a lorry does on the motor way it creates a vacuum on the way throught the air lifting the bonnet will drag air in behind it reducing the air passing throught the rad/air intake which in my opinion wont help nowt at all

Limecat

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Registered: 25th Jun 05
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18th Jul 08 at 23:21

quote:
Originally posted by Wizard1906
i wouldnt recommend this at all just think what a lorry does on the motor way it creates a vacuum on the way throught the air lifting the bonnet will drag air in behind it reducing the air passing throught the rad/air intake which in my opinion wont help nowt at all

The lorry thing is non-sensical, where are you taking your readings from on that lorry?

It is actually the exact opposite to what you are refering to, it is a case of manipulating air pressures to your benefit.

If you want to have a basic understanding airflow it is worth reading Mechanics of Flight, I forget who it is by as it was almost a decade ago that I had to use it for my training But I think it is A Kermode or A Kermole? I can find out if needs be? It is bloody heavy reading TBH, especially if you don't get to play with a wind tunnel which helps it all to click into place!

readerk

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Registered: 4th Sep 07
Location: manchester
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19th Jul 08 at 22:53

It actually creates a negative pressure above the bonnet and a positive pressure below the bonnet, Remember positive goes to negative. I would also advise against this on a corsa, if the inlet was on the front of the engine great but do you really want all the hot air going past the inlet manifold in order to get out of the engine bay. It creates a hotter area right where the inlet area is.

jij_mellow_yellow

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Registered: 18th Oct 07
Location: Anglesey, North Wales
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20th Jul 08 at 11:07

all u need to do is 2 space out the hinge from the car by using washers. cheap and effective.

Dave A

USER UNDER INVESTIGATION - DO NOT TRADE

Registered: 10th Dec 03
Location: County Durham
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20th Jul 08 at 11:24

quote:
Originally posted by readerk
It actually creates a negative pressure above the bonnet and a positive pressure below the bonnet, Remember positive goes to negative. I would also advise against this on a corsa, if the inlet was on the front of the engine great but do you really want all the hot air going past the inlet manifold in order to get out of the engine bay. It creates a hotter area right where the inlet area is.

wrong. From real testing using intake temps with a 1600 on tb's raising the bonnet decreases under bonnet temps quite drastically as well as reducing inlet temps.

Neither will it reduce airflow through the radiator.

m1ke

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Registered: 9th Sep 05
Location: Tewkesbury
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20th Jul 08 at 21:34

does anyone sell the kits ?

alan-g-w

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Registered: 9th Nov 07
Location: Glasgow
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21st Jul 08 at 11:25

I could have them made up if given dimensions

If it's as simple as the picture above looks it shouldn't be too much of a problem

Gareth F

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Registered: 16th Jan 08
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21st Jul 08 at 11:39

Metal plate bent into shape with four holes cut into it (very short How To, Mate done his but needed adjustment) lol. Or go on Ebay, some were on there about a month ago

M666TT C

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Registered: 17th Jun 08
Location: Orpington, Kent
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21st Jul 08 at 20:52

so basically... i looked at my bonnet...

im thinking... about a 4inch x 2inch piece of ally with holes drilled...

correct???

Gareth F

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Registered: 16th Jan 08
Location: Location Location
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21st Jul 08 at 21:29

No idea lol. Tbh i wouldnt bother, people will just think youve had a knock. Not many people will know the real reason for it!

[Edited on 21-07-2008 by munk3yrac3r]

DaveB

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Registered: 29th Dec 00
Location: Huddersfield
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22nd Jul 08 at 13:30

A few of mine

Bit different on mine though due to the fibreglassness of the bonnet

alan-g-w

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Registered: 9th Nov 07
Location: Glasgow
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22nd Jul 08 at 16:53

Any gen on dimensions for the brackets?

M666TT C

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Registered: 17th Jun 08
Location: Orpington, Kent
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22nd Jul 08 at 18:03

yeah.... any dimensions or pics of the brackets used.....?

geordie alex

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Registered: 11th Mar 08
Location: North shields
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22nd Jul 08 at 19:11

look at jamesvalvers build thread. all you need in there fella

M666TT C

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Registered: 17th Jun 08
Location: Orpington, Kent
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23rd Jul 08 at 18:36

quote:
Originally posted by geordie alex
look at jamesvalvers build thread. all you need in there fella

fantastic idea mate!!! shall i SEARCH for it?????

Jakey

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Registered: 4th Jun 07
Location: Sandbach
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23rd Jul 08 at 18:39

quote:
Originally posted by M666TT C

quote:
Originally posted by geordie alex
look at jamesvalvers build thread. all you need in there fella

fantastic idea mate!!! shall i SEARCH for it?????

Or just go to the projects and builds and find it there