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Post by atlex on Nov 29, 2019 16:04:36 GMT
I'd put the scoop in reverse - have the 'opening' facing back, over your hole where the inlet is .. I don't think there is a benefit to allowing air in at the top of the engine bay - you're just trying to make space and I exepect wanting not to let muck onto your nice new engine.
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Post by atlex on Nov 29, 2019 16:06:13 GMT
also fwiw I think a carbon bonnet is the biggest cosmetic waste of money for a mk1 or mk2 - the bonnets are already made of aluminium and you can lose more weight elsewhere where the thing you're replacing is steel, like the boot lid.
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Post by dadbif on Nov 29, 2019 16:12:18 GMT
If you reverse the scoop you lose the “ram air effect” not that you need it, but it would look good with a nice mesh over the intake.
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Post by V6 on Nov 29, 2019 16:55:46 GMT
On the scoop idea I was going to leave the back open as an exit hole. Maybe around 1cm tall. So it wasn't a dead end bug trap. This would allow minimal drag. Air would be free to enter and leave at will. Thus aiding engine bay cooling.
Although I take your points. It could just as well be closed both ends all together. I think you may be right. Mmmm...
I don't like the back end too light. So I won't be interested in a carbon lid. I already lost mass back there with a micro battery and superlight exhaust. It was way too light and ass twitchy. I put a full sized spare wheel back in to gain corner exit grip.
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Post by atlex on Nov 29, 2019 22:14:36 GMT
basically any panel but the front bonnet is a better choice to lighten..
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Post by V6 on Nov 29, 2019 22:33:52 GMT
I am sure that's very true, if you want to save as much mass as possible.
Then again, spending hundreds on each carbon panel is pretty mad unless you've already ditched the boat anchor battery for even bigger and cheaper gains. There is dead mass in a fair few places.
Personally I like the balance of mine now, front to back on cornering. If the back is too light it feels a bit like when the rear anti-roll bar has been over stiffened to me. That may be amusing for car park antics but it's not as grippy on exit or as fast IMHO.
I'd be OK to loose a bit more in the middle or closer to the front.
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Post by atlex on Nov 29, 2019 23:25:59 GMT
BTW curious to see what kind of mileage you'll get out of her now  |
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Post by V6 on Nov 30, 2019 0:07:09 GMT
Meh, who cares. That stuff is for boring diesel owners |
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Post by Vindi (Russell) on Nov 30, 2019 1:55:49 GMT
Agreed on the weight saving, there are loads of places it's good to save weight but carbon bonnet or boot are both pretty pointless unless you've already saved every ounce you can elsewhere. My fibreglass bonnet saves less than 1kg, the wings are similar
I've gone for weight saving wherever I can, but in reality I've probably not saved much overall because of adding the cage back in!
As to the bonnet bulge and vent placement, it depends where you're putting it. I've got a diagram somewhere of where the pressure is positive / negative, but generally you want air out, not in
Russell
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Post by wannabe on Nov 30, 2019 2:27:41 GMT
I've got a diagram somewhere of where the pressure is positive / negative, but generally you want air out, not in Ooh, that would be interesting if you had it easily to hand! |
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Post by dadbif on Nov 30, 2019 6:43:43 GMT
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Post by V6 on Nov 30, 2019 8:11:49 GMT
I saw that pressure chart ages ago. The best spot for letting air out was to the sides of the tip of the bonnet bulge.
However the underside bonnet bracing is in the way there. Hence why the GCF vents I had on my previous bonnet were closer to the front. That's as close as you can get using the OEM bonnet.
I think closed all round may be best. But it depends if we can make it look good!
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Post by wannabe on Nov 30, 2019 11:58:32 GMT
Aerodynamics etc. makes my head hurt - what seems intuitive often isn't! |
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Post by wannabe on Dec 2, 2019 10:43:59 GMT
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Post by atlex on Dec 2, 2019 11:47:33 GMT
codpiece for your big block |
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lol
le sigh