Thread: Will a bonnet scoop reduce heat in the engine bay?

Originally Posted by Homestar

Pffft - Jeremy Clarkson has already shown us what works during the Bolivia special years ago..

Attachment 134576

And when it got really hot, he opened the bonnet, folded it back against the screen and could still see the road ahead...

Originally Posted by border0_3

Hi Ace,

This was already fitted when we bought the D1. The previous owner towed 20ft plus vans to and from NSW with it.

Current temps a bit erratic on the added temp gauge. Getting it checked out.
Original LR gauge never moves from the under half position.

Under 90kms sit 80-90c

Cruise 100-110kms pops up to 100c

Big hills a bit higher.

Don't know if the added scoop helps - probably, as it helps get rid of engine bay heat, but can't compare it to without one.

Time for radiator check, replacement?

Regards

when i changed head on mine, i pulled radiator out and about 3 million locusts and bees and bugs and cows etc. fell out. make sure all the fins are clean. get it tested and rodded or re-cored if needed. check air flow through the front is not compromised. get the whole cooling system cleaned out properly. looking down my block port holes they were pretty blocked with gunk too. check thermostat. if you go through all the effort to pull out rad etc, you may as well put new thermostat in. water pump impeller can wear as well and lose efficiency. check for air in system. start with most simple first. i am obsessive so once i started my head gasket work i wanted everything to work perfectly so i basically overhauled the whole cooling system. my radiator was almost 80% blocked. funny enough though, the car still ran pretty good temps until went up a hill or highway like you say. before i did the work i had no accurate temp gauge, i would just notice the factory gauge start to move going up hills etc and i would quickly step off the throttle and let it coast (not stop).

since ive done the work, the temperatures run beautifully. i once got it to 95C on a 42C day driving through hilly country at 100km/h on my way to gliding. had baby in car so needed AC. was a matter of turning it off uphills and back on downhill. always driving on gauges. my EGT would still on avg at about 550 and got to hottest ive ever recorded of 680C. with coolant at said 95C.

was not the most comfortable drive i must admit. emphasized the need for bigger intercooler, better turbo and higher boost limit. i always drive on gauges though. flying background has this embedded in me.

Hi Val,

Done all that and its way better than it used to be, we towed the old camper to Ulladulla a couple of years ago without a real issue, im just looking at the possibility of fitting vents or a scoop to provide some extra insurance for really hot days.

Matt

Isn't the bonnet already vented at the bottom of the windscreen?

Originally Posted by trout1105

Isn't the bonnet already vented at the bottom of the windscreen?

The base of the windscreen is a high pressure zone

I don't know about the D1 but my D2a is vented there.

are those vents?

IMG_0774.jpg

Originally Posted by Fausto79

are those vents?

IMG_0774.jpg

Wouldn't they be vents for bringing air into the cabin? I have similar on the Mercs, Commodore and Camry.
The engine bay is isolated from those vents, usually with a rubber pinchweld section.