1999 Jimny G13BB Cooling

Hi All,  G13BB Jimny,  is there any use in putting in a bonnet scoop or a couple bonnet vents for the purpose of air flow heat extraction.  Only read a little over the NET but it appears to be a black art,  or just plain BS?  will bonnet vents and or a air scoop do any good to enhance engine cooling,  or at least help extract built up heat on hill climbs and hot weather.   Owl.  

The idea is sound but the issue is type of vent and placement in terms of it being effective. What works when stationary is not necessarily going to work at speed. I would suggest something up by the scuttle panel.

Tough one to answer with any accuracy.
The heat in the engine is just that, it's in the engine. The only effective way out for this heat is via the cooling system, the interaction with the radiator and the air flow through it.
Yes a percentage of the heat is radiating from the engine surface, but it's not designed to be cooled this way otherwise it would be covered in cooling fins. 
So cutting holes in the bonnet is only really going to dump the trapped heat radiating from the engine surface when stationary, of little benefit to the actual engine, but may help peripheral components that are not directly part of the engine.

That's stationary, but then we move forward.

Air that flows through the radiator is sucked under the vehicle, so the air under the bonnet is constantly changing. At this point any bonnet holes may make things slightly better, or slightly worse, as this under bonnet vacuum could reduced by the holes, potentially reducing air flow through the radiator. Only Suzuki or wind tunnel tests will answer the question. The reality is for a moving vehicle you don't need them.

So what will work.

Fit a larger or more efficient electric cooling fan and have the ability to switch it on independently of the thermostat. Keep this running all the time when crawling slowly, it will cool the engine and move that hot air.

Just my ramblings or hot air, but bonnet holes do little to help the engine in my opinion. They can look good though.
Mike 

Suzuki carry out hot and cold weather testing, just like all the other car makers and the degree of torture they inflict is far more than you or I will ever do.

If you suffer with overheating, then the first port of call must be the cooling system but my first question must be.

Does your motor overheat and what are the symptoms?

Roger

Owl wrote: Hi All,  G13BB Jimny,  is there any use in putting in a bonnet scoop or a couple bonnet vents for the purpose of air flow heat extraction.  Only read a little over the NET but it appears to be a black art,  or just plain BS?  will bonnet vents and or a air scoop do any good to enhance engine cooling,  or at least help extract built up heat on hill climbs and hot weather.   Owl.  

I did a mod to my G13BB cooling system (sorry not to do with bonnet scoop)i fitted a vitara heater pickup to the back of the head connected a electric circulation pump plumbed it into heater system

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Modifications aren't an alternative to maintenance. If you're having problems with overheating it's because something is broken.