davidimurray
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| posted on 6/5/15 at 08:03 PM |
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Bonnet vents - what do you think?
I need to add some bonnet vents to let some of the air out from the engine what.
Have sketched these up, but not sure if I like them. What does everyone thinks or any tips for improvement? Is there enough 'meat' left
around the bonnet catch?
 
Description
 
Description
Gallery 1 http://www.facebook.com/media/set/?set=a.116893465324.130778.601005324
Gallery 2 http://www.facebook.com/media/set/?set=a.245243755324.181913.601005324&l=a9831a9319
Gallery 3 http://www.facebook.com/media/set/?set=a.440671625324.232627.601005324&l=3f0d42c523
Gallery 4 http://www.facebook.com/media/set/?set=a.490098255324.297598.601005324&l=efb083b7df
Gallery 5 http://www.facebook.com/media/set/?set=a.10150244028550325.366987.601005324&l=583fd5cd3a
Gallery 6 http://www.facebook.com/media/set/?set=a.10150550640070325.430417.601005324&type=3&l=fe779b358c
Duratec Engine Swap https://www.facebook.com/media/set/?set=a.10152527759580325.1073741828.601005324&type=1&l=40aae5e72f " target="_blank"> https://www.facebook.com/media/set/?set=a.10152527759580325.1073741828.601005324&type=1&l=40aae5e72f
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coyoteboy
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| posted on 6/5/15 at 08:24 PM |
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Looks like an ST185 bonnet vent?
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benchmark51
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| posted on 6/5/15 at 08:38 PM |
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I have put closable vents in the tunnel, may as well use some of that heat to keep me bits warm. Also louvres in the bonnet and small blocks at the
rear edge of the bonnet leaving a gap for heat to escape.
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bigfoot4616
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| posted on 6/5/15 at 08:58 PM |
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i cut some in mine just like you have shown there, in the end nothing i did kept the oil and coolant temps under control untill i fitted a decent
alloy rad in place of the standard polo one.
it works so well now that on cooler trackdays i have to tape up the oil cooler, yesterday at croft all but the top inch of the oil cooler was taped
up(which obviously blocks up a fair bit of the rad as well).
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The Black Flash
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| posted on 6/5/15 at 09:30 PM |
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If you're not sure, cut the vent shapes out of card or paper, and blue tack them on to the bonnet. Leave 'em for a few days and see if
you like them, if not, try a different arrangement or different shapes. I went through a load of designs before settling on the one I preferred:
It's quite complicated getting the shapes lined up right on a compound curve like the bonnet so it's worth the time, you might find that
something jumps out at you after a while.
Bigfoot's look great IMO - fit the car perfectly. But it may differ on yours, I tried that design on mine and it didn't look right to me.
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Hodor
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| posted on 6/5/15 at 09:49 PM |
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quote:
Originally posted by benchmark51
I have put closable vents in the tunnel, may as well use some of that heat to keep me bits warm. Also louvres in the bonnet and small blocks at the
rear edge of the bonnet leaving a gap for heat to escape.
Brilliant idea... where's my jigsaw?
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renetom
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| posted on 7/5/15 at 06:30 AM |
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vents
This is what we did
 
Bonnet Vents both sides
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Ben_Copeland
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| posted on 7/5/15 at 06:35 AM |
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40inches
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| posted on 7/5/15 at 07:34 AM |
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Nose cone, side panel and rear of bonnet vents.
 
Vents
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Oddified
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| posted on 7/5/15 at 08:04 AM |
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When i did a few on my car, i read up on (google) where is best to put them and why. While stationary most will let heat out but on the move any that
aren't in the right place could actually make things worse because the air flow can be going in rather than out! (high pressure zone).
Wool and sellotape is your friend 
Ian
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Smoking Frog
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| posted on 7/5/15 at 11:08 AM |
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quote:
Is there enough 'meat' left around the bonnet catch?
I think by the time some mesh is fixed to the back the area will still be strong enough. Your design using the same angle as the bonnet scuttle join
and being a odd number looks good. Personally I would try keeping the vents all the same size and shape, maybe move them up slightly.
 
Bonnet vent
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Moorron
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| posted on 7/5/15 at 12:37 PM |
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Hi, my bonnet is like that in the original post. The problem is if there is no duct behind it the air will more than likely be going in and adding to
your problem. I can feel the warm pour out when stationary but I need to either add some lips on the outer leading edges to 'bump' the
outside air over the holes to then pull the hot air out from inside the bonnet or add a back panel/duct behind it to stop air going in but letting it
out.
When I originally positioned my design I was concerned about rain water getting in when left outside so didn't add any to the top of the bonnet.
Round holes are much easier to cut in, it took me a good day to cut those shapes neatly into the side of my bonnet.
Sorry about my spelling, im an engineer and only work in numbers.
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dubzter
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| posted on 7/5/15 at 03:10 PM |
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Here is a three part article on undertrays, spoilers and bonnet vents you may find interesting before you go start cutting your bonnet.
Part 1
Part 2
Part 3
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