[Edited on 18/7/06 by givemethebighammer]
Rescued attachment vent positions.JPG
Following on from Mark Allanson's post on under bonnet temps, some of the replies made me think that although I have managed to get lots of air
into the engine bay via my funnel in the nosecone I should be thinking about getting it out somewhere. The engine does not overheat but the footwells
do get hot etc. From what I understand vents in the top of the bonnet are only effective when stationary or at low speeds. Ones in the sides work well
at higher speeds. My one concern with ones in the top is that fumes from the engine bay will be blown back over the aeroscreen into the car (not
nice). I think that maybe ones in the sides won't have this problem. See the picture below what I am thinking, the thing is do I go for sides,
top both ?.
[Edited on 18/7/06 by givemethebighammer]
Rescued attachment vent positions.JPG
Personally, I'd just go for the top ones. The only time the temperatures really rise on our Indy, are when stationary or moving relatively
slow.
The only other time they rise are whilst thrashing it on track on hot days.
Phil
[Edited on 18-7-06 by Hellfire]
Phil, have you noticed any engine fumes being blown into the car after cutting the vents ?
What happened to what exits underneath? That's what all tin-tops rely on.
quote:
Originally posted by Kissy
What happened to what exits underneath? That's what all tin-tops rely on.
quote:
Text My one concern with ones in the top is that fumes from the engine bay will be blown back over the aeroscreen into the car (not nice)
quote:
Originally posted by Marcus
quote:
Text My one concern with ones in the top is that fumes from the engine bay will be blown back over the aeroscreen into the car (not nice)
What fumes?
If all your breathers are working properly, you should only get hot air.
Fair enough - reminds me of old pictures of racers in the 1920s / 1930s with black faces and white eyes due to the oil and crap coming out of the
engine bay
Hello,
I got vents on the side of the bonnet and it's very effective.
The zx12-r is a very hot engine but also when going slow in trafic jam the engine keeps cool below 95 degrees.
Before the tempeture rised too 115 degrees and the fan worked constant.
Daniel
quote:
Originally posted by givemethebighammer
Phil, have you noticed any engine fumes being blown into the car after cutting the vents ?
thanks for all the comments, smartripper do have any photos you can post ?
thanks
I'm leaning towards the three circular holes in each side of the bonnet at the moment. However before I start cutting I'm going to look at a
few more photos.
just the topic i needed. i want to get cold air to my filters and also hot air out as the engine bay gets silly hot (mainly after i have stopped). I
was going to go for the original mk indy one as my bonnet has nothing at the moment.
I have ordered some naca (spell?) ducts that i was going to fit on the side of the nose cone to get air into the engine bay, then just some holes at
the rear most part of the sides of the bonnet. Is this a good idea? someone told me that if the air hitting the lip of the nose cone becomes turbulent
it will have the oposite effect and creat a vacume at that point and no air will enter the duct. I am trying to keep it looking smooth (no sticking
out vents) and also trying to not have one ontop so water doesnt enter when its raining (stationary).
Any suggestions?
Hello,
I've posted a pictures off my car with the vents in it.
Daniel
Rescued attachment Vents.JPG
quote:
Originally posted by Moorron
I have ordered some naca (spell?) ducts that i was going to fit on the side of the nose cone to get air into the engine bay, then just some holes at the rear most part of the sides of the bonnet. Is this a good idea? someone told me that if the air hitting the lip of the nose cone becomes turbulent it will have the oposite effect and creat a vacume at that point and no air will enter the duct. I am trying to keep it looking smooth (no sticking out vents) and also trying to not have one ontop so water doesnt enter when its raining (stationary).
Any suggestions?
The ones on the top will suck air in behind the engine and add to the flow down the tunnel. If you are moving, any fumes will be gone far behind you before you get chance to notice them, if you're standing still they will not blow back anyway.
Went to whole hog and did both in the end. I used a 57mm holesaw, lots of tape and care. I then pressed some steel mesh (B&Q) into small "top
hat" shape (thanks for the tip Simon) using a male and female mould made from an offcut of 7mm lexan and a pair of G clamps. Sprayed them black
and glued them in with Tigerseal (as Hellfire did with theirs).
The result is the top of the engine bay is much cooler (I can actually touch the brake bias adjuster knob after driving now, before it was too hot).
Whether the car runs any better for it I don't know (too soon to tell), but it has to be a good thing getting the hot air out which the
modification is evidently doing.
(ps, photo taken with phone, wife has digital camera -I'll post a better pic when she gets back from the outlaws)
[Edited on 31/7/06 by givemethebighammer]
Rescued attachment vents.jpg
NICE PHOTO, good to hear its worked also. Can u feel the heat with your hand whilst driving (leaning out of your seat)?
i have give up with the naca ducts, they would look to 'stuck on', if i damage the nose cone i will mould them in for a factory look.
I have drilled 3 holes where u have but only on the sides (for now) using a cone cutter (very smooth for cutting this stuff). Then i had a bright
idea, not sure if its too tacky but its undoable if it looks odd. i am in the process of welding 3 small alloy tubes to a plate that will stick out of
the holes angled backwards. sort of looks like an exhaust off a spitfire. I did this to b different AND to help the air eascape sue to the angle
creating a vacume around the vent. i was unsure from the shape of the bonnet if cold air would enter or hot air would exit, i dont know the airflow at
that point.
will post a pic later this week if i have them done.
quote:
Originally posted by Moorron
NICE PHOTO, good to hear its worked also. Can u feel the heat with your hand whilst driving (leaning out of your seat)?
hers my latest work, i just hope it doesnt whisle when drivin lol
erm.. how do i get it to work??
open the pic, right click, copy the bit which looks like this http://www.locostbuilders.co.uk/upload/DSC00743.JPG
then click on the icon that looks like a landscape (yellow background) and paste it in.
new vent1
Please remember to resize the picture and edit out any ridiculous footwear such as pink flip flops and luminous striped socks before you upload
though.
add a picture from your hard drive as an attachment, using the function at the bottom of the reply box by clicking on the browse button, locating the
picture and adding it.
Rescued attachment horrible sock.JPG
lmao! thats my witch girlfriends foot honest.
i thought that was what i did, i will try again with some more pics later this evening. Cheers
On another note are those headlights SVA safe? They look like some of of the motorbike lights (Premier and GTS sell/sold) that others have had problems with.
dont know mate, i bought the car off a member here. i like them and wont change them unless told to.
ps car has passed sva with last owner.
A decent photo of the new bonnet vents as promised
Rescued attachment vents.JPG
Hmm, was that the Donington Trackzone event a couple of Fridays ago? I remember a yellow beastie flying around. If so, i was the blue & black
Locost racer having trouble overtaking even that flippin' Renault Scenic on the straights. 
I need a quicker engine...
Hi what you need to do rob is try and find a trackday were there will be lots of simalar cars with simalar power and then you would be more
competative i think there is one at silverstone this weekend and one at donnington on sept 17.
It's getting serious if your testing for a trackday tho.
cheers matt
Sorry for the thread hijack
[Edited on 22/8/06 by procomp]
Nah, i've tried that and it's too difficult. At least i had a chance against the Scenic!
Actually he helped me to my best laptime of the evening - i chopped 1.4 seconds off the Locost lap record thanks to an absolutely massive tow from the
Renault. If only he could be around this weekend i might actually have a chance at Silverstone!
I was looking into these from Car Builder Solutions (until I discovered, there'd be a minor problem fitting them - there's an exhaust in the
way, one side of where I wanted to put them)
http://www.nfauto.co.uk/lights_reflectors_repeaters.htm
About 3/4 of the page down
SIDE VENTS WITH ORANGE LED REPEATERS
I thought they looked less of an after thought (if you can get 'em to fit!)
Just a thought.
quote:
Originally posted by Rob Palin
Hmm, was that the Donington Trackzone event a couple of Fridays ago? I remember a yellow beastie flying around. If so, i was the blue & black Locost racer having trouble overtaking even that flippin' Renault Scenic on the straights.
I need a quicker engine...