Quote:
Originally Posted by blackrangie
Tell us more about the "vents out in traffic/crawling. Vents in and out bottom at freeway speeds."
Sounds like you might be onto something good.
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Quote:
Originally Posted by blackrangie
Tell us more about the "vents out in traffic/crawling. Vents in and out bottom at freeway speeds."
Sounds like you might be onto something good.
At very slow speeds the fans blow hot air out of the bonnet scoop and also out of the bonnet side vents. Even when the fans are off you can see hot air escaping from the bonnet scoopQuote:
Originally Posted by gavinwibrow
There are two holes cut under the bonnet scoop, at high speeds the air comes in and down each side of the engine and the Venturi effect would assist hot air escaping the engine bay by in effect assisting air to be sucked through the radiator and directing air down next to the engine and where the Exhausts go down.
https://uploads.tapatalk-cdn.com/201...4e1f6cc9a4.jpg
Quote:
Originally Posted by blackrangie
By fans I assume you mean the radiator fans, not extra fans built in?
I'm sure any hole in the bonnet will pass air,, our D2 will need one at the very front to catch any incoming air as the whole top part is a dead air zone,, I reckon the side vents are worth a look though,,,,
Twin thermo rad fans + twin condenser fans.Quote:
Originally Posted by gavinwibrow
Then 2 spals above twin coolers on frame a few inches behind bash plate
Thesw scoops are avail to suit D2 i believe.Quote:
Originally Posted by Pedro_The_Swift
man, that is sexy looking vehicle
I think the idea is to cause the air to be sucked through the radiator to increase cooling. To do that you need to vent hot air from behind the engine to create a vacuum to cause the air to be sucked through the radiator. That requires a rear facing vent or vents so the air goes either towards the windscreen or out the side vents, as on Range Rovers.
A forward facing vent could prevent that happening because the air it took in would not go through the radiator, but would go into the engine bay. So a forward facing vent might not increase cooling. In fact, if the air thru the vent cooled the engine air it might reduce the venting and vacuum effect.
Better to make it easier for hot air to vent near the firewall, I think.
Anyway, I'm no expert, but that's what I've picked up from others who seem to know their stuff.
It should .. depends on it's design.Quote:
Originally Posted by DiscoMick
I've relayed a story before where my '79RRC started running hotter once when out Uluru way, coming home ... where the temp gauge was just on the red zone(normally at half way).
After trying everything else I could(basically thermostat), it wouldn't run cool.
So as a last resort I found a strong cardboard box in a bin at a wayside stop, placed it under bonnet and ran with the bonnet half up(about 6 inches or so) tied down with some coathanger wire.
temp dropped significantly, and in fact had hardly any heat in the hoses. Ran like that to about Marla, where it started raining, and I pulled the box and closed the bonnet. Kept the box in the back .. just in case.
Popped bonnet could equate to a large forward facing vent, to direct cooler air over the engine.
Wouldn't having the bonnet popped be more about venting hot air from the engine bay, not getting more air in through a vent? Venting hot air out would increase the vacuum in the engine bay and pull more air thru the radiator.
I remember when the electric fans died on our D1 on Cape York we pulled off the driving lights to let more air in thru the radiator, which worked.
Intercoolers cool the engine by pushing more air in.
I'm just trying to understand this stuff.