BigJimnyMeet (North) 2024 (12 Jan 2024)
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1999 Jimny G13BB Cooling
- Owl
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Temeraire (2018 quasar grey automatic)
One of the last 200ish of the gen3s, probably.
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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
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- Roger Fairclough
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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
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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 systemOwl 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.
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Thanks Busta but the water pump is at the front thermostat is at the front, how can you guarantee coolant gets to all the cylinders evenly, i thought it would take the path of least resistance. The G13BB in a front wheel drive car has a thermostat at the opposite end of the motorBusta wrote: Modifications aren't an alternative to maintenance. If you're having problems with overheating it's because something is broken.
Over here the G13BB was only in the jimny for 2 years, don't know about the rest of the world, till they sorted the M series motor
You are totally right about proper maintenance is a key
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- Roger Fairclough
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So, I worked for the Rover co. on engine testing and the flow of water through the block was tested by attaching thermo couples - festooning might be a better word - all over the engine. Each was monitored to ensure that a flow of water cooled every part that needed it.
As Busta said, if the system is working correctly you will not have any problems.
Roger
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It's just a mod that I've done useing Suzuki parts I've done other things and planning to do more and dreaming if i only had a M series motor jimny mmm that would kick dirt
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- Reason2doubt
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EDIT: I do like Keith's vents though...from an aesthetic perspective! Would make mine look sporty if it was stationary, but the illusion would die once it pulls away!
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Just Keithy's larger vents in my bonnet, plus a pie warmer that will capture some of the radiated heat emited by the engine and store it within pastry products for later heat dissipation into human bodies, probably around lunch time
But seriously, on all my projects (some of which I do actually complete now and again! ) I always fit a new radiator and thermostat...
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