Vented 240Z/260Z Inspection Flaps

[SeanDezart]

Why doesn't anyone think of having 'sunken' vents ? The vented bonnets I've seen look 'cheap' - the Zs bonnet is such a work of art, a piece of true design and part of its' character and it's 'mauled' by venting !

And even if more effective, vents lower down are even worse...esthetically !

 

[ChrispinZ]

Why doesn't anyone think of having 'sunken' vents ? The vented bonnets I've seen look 'cheap' - the Zs bonnet is such a work of art, a piece of true design and part of its' character and it's 'mauled' by venting !

And even if more effective, vents lower down are even worse...esthetically !

What are your views on a swooshing Knight Rider style light kit in the grille...just out of interest?

 

[tel240z]

DONT GET HIM/US GOING YOUR BE TALKING ILLUMINATED DUST CAPS AND NEON LIGHTS NEXT

THE Zs A WORK OF ART PRICELESS

 

[pmac]

Have had a set done by a local chap working around the corner from my workshop !!! By chance i called in to see him about doing some other work for me and he was stamping out some vents in a side panel for a race car.



Off to be blasted and etched primed next few days .



If you wants some putting into your own inspection flaps (at your own risk) you are welcome to send them to me and i will take them round for you cost is 20.00 pounds per set 3 vents or 25.00 pounds per set 4 vents.

I dont mean to have a go at you Dave but IMO putting just three tiny vents in the wing flap wont alter the cooling by any significant amount at all .......and they just look naff(IMO of course) Seems a shame to me to spoil such a fabulous car with tacky cheap looking add ons like this.
Ill get me coat!. LOL

 

[zedhead260]

This is what I've had done.

 

[Mr.F]

The bonnet vents would work better positioned towards the front of the bonnet rather than the rear

They are supposed to be an exit point to enhance airflow through the engine bay.

a hole in the inner wing

Properly done this could also enhance venting of underbonnet heat - couple it / them up to some Camaro Z28 wing (fender) vents and this would work. I have a pair of vents from a stalled version of this project back in the eighties when building the V8 240Z. Just never got around to doing the cutting!

Go on - you know you want to...

(...please excuse the MJP paperless office...)

 

[Mr.F]

Why doesn't anyone think of having 'sunken' vents ?

Same as above - they are for exit of heat, not entry of cooling air.
NACA style ducts further forward on the bonnet would work for "in". Opening up the front of the bonnet bulge would work. Best of all would be a cowl induction bonnet taking air from the high pressure area at the base of the windscreen.

How about this to feed a baby turbo? Or sunk into the bonnet the other way round to house a fuel pressure gauge?

 

[datsun dave]

I dont mean to have a go at you Dave but IMO putting just three tiny vents in the wing flap wont alter the cooling by any significant amount at all .......and they just look naff(IMO of course) Seems a shame to me to spoil such a fabulous car with tacky cheap looking add ons like this.
Ill get me coat!. LOL

Pete i here what you are saying it does need 1 or 2 more vents putting onto it, but its a spare set that i had done not the original ones on the car.

When its all finished and the vented inspection flaps do not go with the look of the car will be able to swop it over.

 

[twoforty]

They are supposed to be an exit point to enhance airflow through the engine bay.

Problem being there is positive pressure here caused by the windscreen so little air will flow out of the vent.

snippet from hybridZ
If you want to vent the hood with hood vents, the vents have to be way forward of the trailing edge of the hood to stay out of the high pressure area created by the angle of the windshield in relation to the hood. Opening the hood and leaving it on the safty latch doesn't do much to vent the underhood air but it does do something to releave underhood temps. How does this happen if there is a high air pressure system at the base of the windshield? The answer is in the side openings of the hood. I can to this conclusion because a cowl induction hood causes temperature issues. The additional air that comes in caused by the high air pressure system at the base of the windshield hits the air that is coming through the radiator in effect slowing it down, and all of this air competes to exit under the car. With the hood popped, the radiator air has a way to escape out the sides of the hood and around the car.
What I would like to try, and will do so on my car, is to try to vent the underhood air to the sides of the car with someting like TitaniumZ has done at the TC cups. Also, once the front of the car is has been sealed and air can only enter the radiator or go over the hood, I'd like to try to help the air go around the windshield. Areas of concern would be the A posts at the drip rails and the windshield gasket.

 

[Rob Gaskin]

I've run on track days in hot weather with the bonnent on the safety catch. Not thought of the air pressure issue in front of the screen but it must help to let the hot air escape surely? It would help in the queuing situations anyway and therefore slow heat build-up.

The problem is that most Marshals want you to close the bonnet, or some helpful chap does it for you!

My next idea was to make the inspection flaps removable, haven't tried this yet.

 

[twoforty]

seems like the inpection flaps would aid cooling better than the bonnet vents when the vehicle is on the move.

 

[Mr.F]

So - when will McLaren let us put a Z into their wind tunnel to test aerodynamics and the best placement of vents...??

Re. cowl induction - this is ideal (with suitable internal partitions) to duct cold air into a centrally placed carburettor or injection intake on a V8 installation. It was never intended as an exit point for hot air with the car on the move.

 

[JakTheRuby]

Unless the air intake on the bonnet is nearer the front and is of the "scoop" variety ie hole pointing forwards then the effect of cooling whilst in motion is negligable. If anything, having anything stuck out from the beautifully contoured original is going to cause a small amount of drag (because the air flowing over the top is interrupted). This whilst on the move will cause "hot spots" which also has a negative effect on the efficiency of yer engine. The whopping great radiator grill at the front is more than sufficient to get cooling air in. I could draw you a diagram and show you some drag coefficients but no one would care and i'm boring myself now!

 

[Rob Gaskin]

I saw an American book once in the 'Motorbooks' shop Leicester Square which showed results of experiments with spolier on Zeds. Very interesting, tried to find it again the other week with no joy (should have bought it first time). It may have covered vents too.

Anyway I'm in London this weekend with the 'Misses' I'm sure she'd enjoy a look in the shop again.

I like the practical approach to aerodynamics myself. I was told by a very good source that he tested the rear hatch spoiler on a Zed by driving one with spoiler on and off and getting a passenger to get in the back and see how hard it was to open at speed!! Awesome. Apparently it does have a positive effect! Nissan got it right then.

I live near MIRA wonder if they would like a challenge?

 

[twoforty]

homemade wind tunnel....now that would be fun!

On a serious note, now I have my car running well I have been screaming the Nuts off it, and it never overheats, water wetter made a difference to the cooling for sure....the exhaust does glow red. Maybe an electric fan on a timer to blow air through the engine bay after the car is switched off would be a better idea.

 

[datsun dave]

homemade wind tunnel....now that would be fun!

On a serious note, now I have my car running well I have been screaming the Nuts off it, and it never overheats, water wetter made a difference to the cooling for sure....the exhaust does glow red. Maybe an electric fan on a timer to blow air through the engine bay after the car is switched off would be a better idea.

Or suck the hot air out through the front.

 

[twoforty]

I like the practical approach to aerodynamics myself. I was told by a very good source that he tested the rear hatch spoiler on a Zed by driving one with spoiler on and off and getting a passenger to get in the back and see how hard it was to open at speed!! Awesome. Apparently it does have a positive effect! Nissan got it right then.

Love it! lol

The wind tunnel testing has been done over on hybridz but the "Oracle" suggested the tests were a waste of time.

Cutting holes under the battery tray and by the brake servo would work well to get rid of heat when moving.

 

[twoforty]

http://www.zccw.org/Tech/Body/early_aero.asp

 

[twoforty]

Or suck the hot air out through the front.

How about reversing the radiator fan once the car had stopped, easy enough to do.

 

[Rob Gaskin]

I seem to remember Ben's hillclimb car has lots of metal cutaway around the bulkhead/innerwing area?