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Old 30-01-03, 22:28   #1
ITG-05Z
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engine cooling via bodywork

just wondering anyone out there running a VL turbo that has a walkinshaw bonnet on it with holes and vents to allow hot air that traps to escape????????? would this bonnet be suitable for engine cooling???


the way i see it it would allow the motor to run cooler if correct wholes are cut out from bonnet with the walkinshaw bonnet scoop on it



any ideas?
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Old 30-01-03, 23:21   #2
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Engine Cooling

I suppose it would work, I mean I'm sure the Walkinshaws had them there for a reason... :roll:
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Old 30-01-03, 23:43   #3
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walkies were V8s .. V8 takes air intake from above with a bonnet scoop, so the scoops basically feed the air intake with a very nicely placed cold air intake ..
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Old 31-01-03, 08:17   #4
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Yes, they work well for cooling the engine.
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Old 31-01-03, 21:53   #5
Red RB30 Jet
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I would love to see a VL bonnet completely covered in Louvers just like the "Old School" Hot Rodders use you know the ones where they use a press to punture and shape little louvers into the bonnet skin, this should definately help keep underbonnet temperatures down.
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Old 01-02-03, 01:23   #6
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Ive always wondered with the walky bonnets though, doesnt your engine get really wet in the rain? Possibly damaging some important electrics?
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Old 01-02-03, 05:55   #7
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Red RB30 Jet: Thats exactly what I am doing with my car, couldnt bring myself to cut the std bonnet up so I have a spare and the aluminium louver panels, once done (and proven at the track) I will get it painted silver.

DVS 86: Leaving a Walkie in the rain......wash your mouth out!!!
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Old 01-02-03, 08:40   #8
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I know, its heresy to speak of leaving a Walky n the rain. :cry:

But I was more talking about driving it in the rain. I am thinking of getting a Walky scoop for mine but I was just wondering about the weather. I have had nasty experiences with my VL in the wet as far as water damage goes, dont want a repeat performance.
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Old 03-02-03, 00:19   #9
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the walky had twin thrott's and didnt fit under the bonnet with out the scoop
but i sopose it would cool it down a bit.......
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Old 03-02-03, 04:26   #10
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The scoop was designed in conjunction with the front air dam to ram air through the radiator and to clear out excess heat through the scoop on top of the bonnet, we all know that hot air rises. The scoop was not designed to suck fresh air down into the air intakes in a race as the HRT Walkies and the others had a carbon airbox ram system that faced forward, not up like the road going Walkinshaw. A limited amount of downforce could also be set through the adjustable fins in the scoop itself, which also did not carry over to the road version (not from what I know anyway).

Also, the side ports of the front bar were ducted to cool the front brakes, as V8 supercars still do today. The entire kit was designed in a wind tunnel in the UK by Tom Walkinshaw (hence the nickname) and reduced the drag co-efficient and incresed downforce of the car by a rather large margin in comparison the HDT VL SS Group A Brock. The HRT Walkinshaw driven by Alan Grice and Wynn Percy won bathurst in 1990 flogging the turbo hoardes that invaded the championship.

Small history lesson, IMHO the scoop will aid in cooling as the hot air will just float out the top of the scoop into the atmosphere.
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Old 03-02-03, 19:32   #11
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I think you are correct in your explanation DVS 86 but a tad out in the history.

It is true that the Walky came out and "flogged the turbo hoardes that invaded the championship" (including the 1988 and 1989 winners in the Sierra RS500, Tony Longhurst/Tomas Mezera and **** Johnson/John Bow).
Although the walky only ever won a single bathurst (1990).
It was also luck that the walky even competed in the 1990 bathurst as the VN group A had just been released, but because some drivers felt it (the walky) was a faster package then the current (at the time) vn group A, it was used instead.

Excluding Bathurst the "turbo hoardes that invaded the championship" still dominated the field.

With the introduction of the Nissan Skyline GTR everything changed again, with the GTR being coined as Godzilla as nothing could beat the japanese monster.
Nissan's GTR's were so good infact that they won almost every race in the championship series.
Even when the rules were then changed for the 1992 series, adding 150kg of ballast to the Nissan Skyline GTR while limiting boost to 1.3bar, they still won and dominated the field.
Their Bathurst 1000 results display this dominence well, in 1991 (first and third) and in 1992 (first and third).

1993 saw the introduction of the V8 supercars, and the end to all cars not v8 powered. It was supposedly introduced to create a better and more even race series.

But this may again be dominated by the Skyline GTR, as Nissan have been talking about releasing the next model Skyline GTR in V8 guise to Australia.
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Old 03-02-03, 22:42   #12
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I know all that VK, just my little biased attempt to corrupt views of history for those not in the know. After all, only Bathurst matters right. :mrgreen: The rest is just sprint rounds.

OT - Id love to see the engine Nissan would use considering AVESCO rules state that the cars have to be rwd, single cam pushrod V8's with a capacity no greater than 4999cc and running on 98 octane fuel (optimax is used). I mena its possible but its why Toyota havent appeared yet or Mitsubishi for that matter.

Maybe we should start a new thread. To sum up, Walky's are cool, therefore using walky bits on yur car will make not only your car cool, but will also keep temperatures cool.

Going to work now, bye. 8O
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Old 06-02-03, 22:22   #13
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GRKBOY-
I gave some thought to this, considered placing one or two vents into
my bonnet..,.
The original line of my thoughts was for a simple vent (AH LA Sigma
Turbo) which u could consider, the actual factory sigma turbos also
had a rain catcher tray underneath one of the vents.
Further thoughts went to louvring of the bonnet like on 74' toyota corona's
or the side vents on monaros eg; (site has nice pics of vx monaro too) http://www.geocities.com/monaroshrine/hgmonaro.html

... also considered just putting a second line of the vl plastic vents in
the bonnet about 15cm in front of the oem ones, centred and about 2/3
of the length of the oem ones... wouldn't look too out of place if you
visualise it... and would look tastefully oem...
but to put the vent pretty much where I wanted to put it would mean
cutting into the bracing bar(s) on the bonnet underside (not a good idea).

nahhhh...I really wanted something that could not catch the eye of
those whose eye u do not want to catch.
I haven't done this yet, but what is going to happen is I'm going to make
two slots
_____ __________________________ _____
/////|//////////////////////////\\\\\\\\\\\\\\\\\\\\\\\\\\|\\\\\\\\\ vent line
-------/ \----- <metal undervent plate
======/ ____________ ____________ \========== top of firewall
/ |____________| |____________| \ firewall slots

in the firewall a couple of centimetres below the bonnet line. These will
allow hot air to escape into a metal box, the bottom of which begins
slanting upward from just below the vents to join the metal just behind
the plastic vents. Its isolated from the rest of this space behind the
firewall because it's a proper enclosed box with metal sides, left and right.
If u have an underbonnet fire then its goodbye to the plastic vents and
possibly the windscreen of course. Absolutely necessary to enclose it-
because of possibility of exhaust fumes leaking from eng/exhaust!!.
The box hot air exhaust area is centred, and about 1/4 the length of this
vent line. Two flat plates, sitting directly under the vents for about 15cm
directly on each side of the box prevent hot air being drawn into the vehicle
(the space mentioned is where the air con draws its air from).
Result; TOTALLY invisible from outside, allows hot air out which 'pools' at the
rear of the engine (especially when sitting at idle, which is what u really want).
The slots themselves will be capable of being closed off (by same size plates)
for winter driving. (If we ever get a proper winter this year, phew!).
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Old 06-02-03, 22:31   #14
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GODDAMN IT, this site not only doesn't allow you to post small pics into it
(I aint taking about linking), IT also rips out all Yr spaces.
Here's what that pic should look like......

. ______ __________________________ _____
./////|//////////////////////////\\\\\\\\\\\\\\\\\\\\\\\\\\|\\\\\\\\\ vent line
. ------ / \----- <metal undervent plate
.======/ ____________ ____________ \========== top of firewall
. / |____________| |____________| \ firewall slots
.
I hope..,
OBES NOT...
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