Thread: Fors and against Bonnet scoops

dirty dwag

so what's the design idea behind installing a bonnet scoop, is is it to reduce heat dissipation by the engine ? so you effectively are pushing air downwards on op of the engine , remember in deep water crossing you will also push water on top of your engine.

What and look like a new Cruiser

I would think that the extra amount of dirt and crud entering would be an issue, deep water also (as mentioned) and anyway the main reason vehicles have a bonnet scoop is to increase airflow either into an airbox mounted at the top of the engine or across an intercooler mounted there (e.g. Patrol's, Hilux's and new Cruiser 70's).

positive engine bay pressure has some good features, but venting can make a big difference cooling wise. mate had a rangie that he vented and it made a significant difference temerature wise and he never looked back... a defender, i would have tought would leaked air all round the bonnet, why not just adjust your bonnet stops and latching pin up 5mm ? but there is the bling factor :P

Originally Posted by incisor

positive engine bay pressure has some good features, but venting can make a big difference cooling wise. mate had a rangie that he vented and it made a significant difference temerature wise and he never looked back... a defender, i would have tought would leaked air all round the bonnet, why not just adjust your bonnet stops and latching pin up 5mm ? but there is the bling factor :P

Good Idea Dave, No bling for this dawg...just another thing to break as I use my bonnet as an observation post when deciding directions
I got the idea from Sith who has put a nissan one on his RRC as for the facing it will be on back wards as not to push air/water in but let hot air out,,,just a thought at this stage hence the poll

Originally Posted by incisor

... a defender, i would have tought would leaked air all round the bonnet...

I didn't say this in my previous post, but I thought it too!

Originally Posted by incisor

a defender, i would have tought would leaked air all round the bonnet, why not just adjust your bonnet stops and latching pin up 5mm ? but there is the bling factor :P

Some Countys have have a rubber seal around the lower edge of the bonnets to seal on the top of the mudguards. I assume it was for noise reduction as I've only ever seen it on 4BD1 Countys.

Ron

Originally Posted by p38arover

Some Countys have have a rubber seal around the lower edge of the bonnets to seal on the top of the mudguards. I assume it was for noise reduction as I've only ever seen it on 4BD1 Countys.

Ron

Yes. Also fitted to late S3 diesels (not just Isuzu).

This suggests providing extra ventilation on the bonnet will increase noise levels.

John

Originally Posted by JDNSW

Yes. Also fitted to late S3 diesels (not just Isuzu).

This suggests providing extra ventilation on the bonnet will increase noise levels.

John

My V8 County didn't have the seals.

Ron