scootz
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| posted on 31/8/11 at 07:15 PM |
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Should I Open-Up Bonnet-Bulge Vents?
I've had to fit a 'bulge' to the bonnet to clear the V8 engine. Thankfully I had a GRP one lying about in the garage, so it will
do.
I'm just wondering whether or not to open the vents? The engine-bay temps are ridiculously high... would opening the apertures help?
Cheers.
It's Evolution Baby!
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Mark Allanson
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| posted on 31/8/11 at 07:18 PM |
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Getting air into a seven engine bay isn't the problem, its getting it out!
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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scootz
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| posted on 31/8/11 at 07:30 PM |
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That's my concern! 
It's Evolution Baby!
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Jon Ison
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| posted on 31/8/11 at 07:34 PM |
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I would set somthing up to get the hot air from the rad deflected up and out before it reaches the engine bay, I did this on one and threw the fan
away, if anything I had problems getting up to optimum temp not keeping temps down
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austin man
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| posted on 31/8/11 at 07:54 PM |
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open the sides up to create a flow of air same as the Dax really helps to get rid of the heat
Life is like a bowl of fruit, funny how all the weird looking ones are left alone
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scootz
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| posted on 31/8/11 at 07:57 PM |
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Cheers Jon.
The rad-heat is minor. It's the heat from the exhaust manifolds that's causing problems.
It's Evolution Baby!
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scootz
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| posted on 31/8/11 at 07:58 PM |
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quote:
Originally posted by austin man
open the sides up to create a flow of air same as the Dax really helps to get rid of the heat
Worth a try!
It's Evolution Baby!
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Jon Ison
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| posted on 31/8/11 at 08:20 PM |
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May be minor but it's heat from the engine your trying to cool then your flooding it back into the engine bay to heat the engine to cool it
again if that makes any sense, honestly it will make a huge difference to engine bay temps
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loggyboy
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| posted on 31/8/11 at 08:25 PM |
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quote:
Originally posted by scootz
Cheers Jon.
The rad-heat is minor. It's the heat from the exhaust manifolds that's causing problems.
Are they wrapped?
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scootz
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| posted on 31/8/11 at 09:03 PM |
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They were, but the wraps were flaking to pieces, so I took them off (I never put them there).
It's Evolution Baby!
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Chippy
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| posted on 31/8/11 at 10:28 PM |
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Hi Scootz, this is a picture of how I overcame the same problem with my V6. Just made up a couple of alloy vents as shown, worked a treat. Excuse
missing gaurd, lost on the way to Stoneleigh, :-) HTH Ray
[img]
 
Showing vent
[/img]
To make a car go faster, just add lightness. Colin Chapman - OR - fit a bigger engine. Chippy
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bi22le
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| posted on 31/8/11 at 10:35 PM |
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I have a vent right above my manifold. the amount of heat distorsion bellowing out of it when im standstill is incredible. let the vents do the work
when stand still and the rad do the work when moving.
solves all problems.
word of warning. too many vents and lots of speed means a bonnet lost at 100mph on the motorway!!
Track days ARE the best thing since sliced bread, until I get a supercharger that is!
Please read my ring story:
http://www.locostbuilders.co.uk/forum/13/viewthread.php?tid=139152&page=1
Me doing a sub 56sec lap around Brands Indy. I need a geo set up! http://www.youtube.com/watch?v=EHksfvIGB3I
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franky
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| posted on 31/8/11 at 10:47 PM |
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I use vented wings and have no issues. Not a fan of wrapped exhausts as they cause more problems than they slove.
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NeilP
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| posted on 31/8/11 at 10:51 PM |
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Wot Bizzle sed.
Vents directly above manifolds are of massive help when at standstill (when your cooling load is at it's highest, ran fan or not). Put them on
mine and it massively reduced the spikes in temp I was getting when queuing in traffic after a blat...
HTH, N.
If you pay peanuts...
Mentale, yar? Yar, mentale!
Drive it like you stole it!
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Mr Whippy
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| posted on 1/9/11 at 07:37 AM |
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what a mad bonnet
I think you have way to much air getting in, then expanding with the heat and can't get it back out again, the bonnet side vents should have
been at the back not the front
[Edited on 1/9/11 by Mr Whippy]
Fame is when your old car is plastered all over the internet
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scootz
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| posted on 1/9/11 at 08:10 AM |
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Cheers guys!
I'll extend the bonnet vents on the side along the full length and add a vent to the side-panel
It's Evolution Baby!
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scootz
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| posted on 1/9/11 at 04:22 PM |
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Step 1 complete... now to make some Daxy style side panels! 
It's Evolution Baby!
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Mr Whippy
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| posted on 2/9/11 at 10:55 AM |
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hmm that engine is huge, I mean just nuts
Fame is when your old car is plastered all over the internet
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StuartBJ
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| posted on 4/9/11 at 01:31 PM |
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Hey Scootz,
Its all about big engines in small spaces ...... good work
You definatly need to get air flowing through that engine bay and not the engine bay acting as a wind sock..... try modding a few ideas like these and
the vent above....which is a great 7 mod.
1) Can you add any lourves? on the bonnet? one the side panel? That would solve a lot of issues.
2)Heat management.... I would give serious consideration to adding a reflective layer to your body work interior, even if its a simple layer of
aluminium tape, if its getting that hot underneath then it may be a few quid well spent..... Ive been in a car when the fibreglass caught and the
whole car went up in smoke in 2-3 minutes..... and wrap those exhausts back up for sure, or cam coat them etc.
3) What about your rad? Do you need to swap it for a deeper one? Fans?.... can you uprate them to a hight airflow, I think mine are about 1000cfm
each.....and you could always go for an electrical water pump if you were so inclined for total optimisation.
Hope thats given you some food for thought?
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scootz
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| posted on 9/9/11 at 11:17 AM |
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Cheers Stuart.
I've swapped out the old rad for a larger ali one.
Side vents have been made and fit well...
It's Evolution Baby!
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sprouts-car
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| posted on 9/9/11 at 11:41 AM |
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Wow thats a big vent. Luck the engine is so big, otherwise it'd fall out the side!
Build blog
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scootz
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| posted on 9/9/11 at 11:43 AM |
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I made it wide enough for the exhaust to exit through it.
It's Evolution Baby!
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Macbeast
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| posted on 9/9/11 at 04:35 PM |
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By coincidence, I was doing mine today
Now to see if the plastic melts or the paint blisters
[Edited on 9/9/11 by Macbeast]
I'm addicted to brake fluid, but I can stop anytime.
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