Need suggestions for bonnet vent ?

A

AJ4

Guest
I've got rid of my sparrow catcher bonnet and have a flat one on it now. I'd like to put some sort of vent in it rather than jacking it up at the back to get heat out.

Can anyone suggest a style of vent thats not too Max Flower looking ? I need it to be functional, dont really care what it looks like. Something flat would be nice with a sunken vent, like the evolution kit, something that makes the bonnet look flat when view from the front ;)

Not really up on this 'styley' sort of stuff, so if anyone can suggest a style I'll be more than grateful.

Cheers !
 
A

ashills

Active Member
only vent i would want is the focus wrc off the older cars looked wicked 1 vent on either side rather than the big one they had that was right across bonnet
 
KF79GTIR

KF79GTIR

New Member
why not design your own & take it to a bodyshop to find out how much it will be better than trying to find somthing to fit & why are you ditching the original bonnet
 
campbellju

campbellju

Moderators
Staff member
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CruiseGTi-R

CruiseGTi-R

Member
Get the bonnet louvred. best example I can think of is an e-type bonnet (about as far from max power as you can get). there are places that will do this and it looks sensible and considered.

If you wish to be really stylish you can even get the louvres done in the places which the oe ones would be, a little style nod to the original bonnet.

http://images.google.co.uk/imgres?imgurl=http://mk29.image.pbase.com/u3/mdlempert/large/532298.Dscn0292.jpg&imgrefurl=http://www.pbase.com/image/532298&h=600&w=800&sz=72&hl=en&start=1&tbnid=sVdM5mshvVcoxM:&tbnh=107&tbnw=143&prev=/images%3Fq%3De-type%2Bbonnet%26svnum%3D10%26hl%3Den%26lr%3D%26sa%3DG

http://images.google.co.uk/imgres?imgurl=http://home.milkmandan.org/dev/null/archives/jaguar_xke_bonnet.jpg&imgrefurl=http://home.milkmandan.org/dev/null/archives/2006/01/collectible_aut_11.html&h=480&w=640&sz=63&hl=en&start=16&tbnid=jSliO3IuHhuAJM:&tbnh=103&tbnw=137&prev=/images%3Fq%3De-type%2Bbonnet%26svnum%3D10%26hl%3Den%26lr%3D%26sa%3DG
 
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campbellju

campbellju

Moderators
Staff member
I like the louvres idea if I could find somewhere local and cheap.

For what its worth, http://www.motorsportworld.co.uk/ do them from RGM, they are the RGM-AC24 and RGM-AC39 £40 or £45 delivered. I like the AC39, would look similar to the Integrale EVO bonnet
 
CruiseGTi-R

CruiseGTi-R

Member
I suppose the simplest idea would be to use the oe louvre vents and cut holes out of the bonnet yourself. At least it wouldn't cost very much then. But, I think you'll get better cooling suction by using a longer 'strip' of louvres (I think oe ones are a bit short/useless).
 
campbellju

campbellju

Moderators
Staff member
Ross, with you having an understanding of aerodynamics and the heat from the engine, aside from the look of the thing, functionally where should they be and how much venting do we need?
 
A

AJ4

Guest
I was thinking of something along the Evo lines, but the louvres would be more subtle... maybe I could find some in mild steel that I can cut into the bonnet and weld so it looks one piece ?

The most airflow is over and under the block, so the best place for a vent would be just above the exhaust manifold area. Anything you can do to get the flow through the front mount and then up and out the bonnet the better. If you dont, the air has to flow down over the back of the block past the inlet manifold and the bulkhead, which is kind of like a parachute :D
 
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campbellju

campbellju

Moderators
Staff member
CruiseGTi-R said:
I suppose the simplest idea would be to use the oe louvre vents and cut holes out of the bonnet yourself. At least it wouldn't cost very much then. But, I think you'll get better cooling suction by using a longer 'strip' of louvres (I think oe ones are a bit short/useless).
Click to expand...
That was my plan A until I noticed they actually vent very little over a standard bonnet
 
campbellju

campbellju

Moderators
Staff member
AJ4 said:
I was thinking of something along the Evo lines, but the louvres would be more subtle... maybe I could find some in mild steel that I can cut into the bonnet and weld so it looks one piece ?
Click to expand...
I've thought that too, there seem to be a load of E-type vents around but they are length rather than width ways
 
A

AJ4

Guest
the standard louvres aren't really in the right place and are more for show than function. Thats probably why they are blanked off from the factory ;)
 
A

AJ4

Guest
the things is, I dont give a stuff about how it looks, as anyone who has seen my car will tell you :lol: It just has to be functional ( and discreet ;) )
 
Rishi

Rishi

Still waiting on some shims!
I've always been a fan of the 400R and the ZTune vented bonnets....

Failing that i was gonig to use an EVO style venting but then got hold of my Glass Fibre Turini Bonnet....


Rishi
 
Mr GTiR

Mr GTiR

New Member
AJ4 said:
the louvres would be more subtle... maybe I could find some in mild steel that I can cut into the bonnet and weld so it looks one piece ?
Click to expand...
If you do a search on the net there a company called ‘cool louvres’ or something like that. If you send them your bonnet and tell them what you want they will stamp it for you so you retain your original bonnet. All you need to do is have it repainted and fit it.
 
Nigell_d6

Nigell_d6

New Member
What about one that opens at the right temp or speed using the porche mechanicals, and in all honesty, with what is left in your engine bay,with the space for air to move, just take the rubber seal off at the bonnet join, cheap,

Nigel, :roll:
 
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