Project bonnet scoop

**glenhendry** · 1st April 2012, 03:04 PM

I see and read everywhere that heat is the RR's natural enemy. I hear about fuse boxes succumbing, and very high underbonnet temperatures. When we are moving, I am sure the temps are fine under the bonnet as the air coming through the radiator and grill are pushed downwards by the firewall and under the car, but when the car stops, all the heat just sits there and cant escape due to the clamshell bonnet. The RR classic had a scoop/vent I believe and the P38 overfinch too, I think it will be a good move. I am all for original looking P38s in terms of bumpers etc, but a low profile scoop/vent might look nice and if I hate it, I can just get a new bonnet.

I have bought a bonnet scoop and am going to install. I will post pics along the way. My bonnet's paint is pretty crap anyway so I dont have too much to lose.

My question to the group is, facing forwards or backwards. My main aim is to allow heat to escape upwards when the car is turned off and parked. I think my default decision will be rear facing. Comments welcome.

**Mick_Marsh** · 1st April 2012, 03:43 PM

Opening backwards towards the windscreen of course.
Maybe even put vents in the top of the bonnet scoop.

**p38arover** · 1st April 2012, 03:47 PM

Place it on the bonnet and take some pics facing both ways for us to critique.

Why not face it forward to get a little more air through the engine bay when driving?

**Mick_Marsh** · 1st April 2012, 04:50 PM

Originally Posted by p38arover

Place it on the bonnet and take some pics facing both ways for us to critique.

Why not face it forward to get a little more air through the engine bay when driving?

If you face it forward, the air entering will be competing with the air coming through the radiator for an escape route. This may result in less air passing through the radiator and possible overheating.

**Pedro_The_Swift** · 1st April 2012, 05:32 PM

Backwards,,

will also let more noise out,,
would LOVE to see some before and after (where??) temps--

**33chinacars** · 1st April 2012, 10:08 PM

Maybe something like this would have been better at getting heat out from under bonnet.

UNIVERSAL FIBREGLASS BONNET VENTS PICK UPS WELCOME | eBay

Usually a low pressure area at the base of the windscreen. so if you put your scoop facing backwards it will draw air into engine bay. As it did on A9X Torana's. These were blanked off from the engine bay on the racecars & only fed the air cleaner etc.

Gary

**benji** · 2nd April 2012, 06:03 AM

I would have thought facing foward would be the best option. It would allow heat to escape whilst sitting in traffic, and direct air into the engine bay whilst moving. The air vents in the classics were behind the bonned, and directed air into the cabin. I think the main difference is, the p38's have a seal around the outer edge of the bonnet, so the heat cannot escape.

**whisky_mac** · 2nd April 2012, 09:08 AM

I like the vents in the front guards on the L322s, maybe you could modify them to fit the P38.

**p38arover** · 2nd April 2012, 09:43 AM

Originally Posted by whisky_mac

I like the vents in the front guards on the L322s, maybe you could modify them to fit the P38.

I think it would be easier to fit RRS vents. I have some pics here and will post them a bit later.

But both would need under-guard / inner guard mods. The scoop is much easier.

**wayneg** · 2nd April 2012, 12:57 PM

I have seen a couple of Classics with vents cut into the rear sides of the bonnet. Maybe thats an option
Something like these......http://www.ebay.com/itm/Auto-Truck-S...bd17dd&vxp=mtr

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