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BigJimny Meet 2019 (17 May 2019)

BigJimny Meet and off-road driving day



20TH OCTOBER 2019

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Noggin and Natter - pre-event chat - Old Bell at Grazeley (part of hotel) 7:30pm 19th October

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supercherger noise jimny 2017 gen 3

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31 May 2019 17:15 #209323 by barnsley john
just a curious question
and before anyone states the obvious
yes I know what a supercharger is and what and does having one on a lotus a few year ago

our jimny sound like its got the noise from a supercharger when revving it
so any one tell me what it is
is it the main fan front of engine or something else
sounds cool anyway a bit like a Mitsubishi 4 wheel drive thanks john

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31 May 2019 18:43 #209329 by Lambert
Ther shouldn't be anything like that. It should be nice and quiet. It's going to be a case of using a long screwdriver as a stethoscope to the ear and closely listen to each rotating component on the engine in turn. However I wouldn't expect any of them to be giving trouble on such a new car. Alternatively it could be electrical noise coming through the stereo from a bad connection or failing suppressor but again the car is not really old enough.

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31 May 2019 18:53 #209330 by barnsley john
sorry lambert may not have explained properly
engine is sweet
if you stand a meter or two away from jimny with our lass revving it
it sounds like a old type of fan noise like on old fords
but to me more like a Landcruiser or Mitsubishi
I take it the air scoop is just a filter thanks john

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31 May 2019 19:14 #209332 by Keithy
If it's when you first start it up.....yeah they sound like a tank....vicious fan.

some call them viscous.....they've never had their fingers in a hot one lol

I thought for a moment you had a supercharger fitted....was going to press for pictures of the install lol

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31 May 2019 19:17 #209334 by facade
The fan roars, more so when the engine is cold (all viscous fans do, I never figured that out, you'd expect it not to drive when it is cold, maybe the fluid takes a while to get the right idea?)

I can't say I ever heard a noise like a supercharger from my gen 3, the gen 4 has a less reliable electric fan to shave 0.0001g off the emissions so it doesn't do it.

If it suddenly breaks, go back to the last thing that you did before it broke and start looking there :)
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31 May 2019 19:44 #209339 by Lambert
Ah ok. What they said above.

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31 May 2019 19:51 #209341 by barnsley john
am I getting mistaken then from a intercooler not supercharger
the fan is what I thought is it what would have been on cars before electric fans ie my old ford capri thanks john

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31 May 2019 19:53 #209342 by Riccy
On the european diesel jimnys the bonnet scoop might be for an intercooler, likley just a vent on a petrol.

There is a turbo kit on aliexpress for the jimny, that would make use of the scoop with a nice intercooler :whistle:

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31 May 2019 19:56 #209346 by Lambert
When you look at the mouth of the scoop it is blanked off with a black plastic trim.

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31 May 2019 19:58 #209347 by Keithy

facade wrote: The fan roars, more so when the engine is cold (all viscous fans do, I never figured that out, you'd expect it not to drive when it is cold, maybe the fluid takes a while to get the right idea?)

A very interesting device....much maligned and works a treat.

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31 May 2019 20:05 #209348 by Keithy

barnsley john wrote: am I getting mistaken then from a intercooler not supercharger
the fan is what I thought is it what would have been on cars before electric fans ie my old ford capri thanks john

Not sure what you mean....an intercooler cools the air before it gets compressed again by another compressor.....turbo feeding a bigger turbo etc....an aftercooler is on an engine equipped with a single turbo or supercharger....."compressor" in it's exemplar definition.......inanimate objects are usually quiet until acted on by outside forces.....rocks and branches lol.....then they hiss and have fits.

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31 May 2019 20:53 #209354 by facade

Keithy wrote:

facade wrote: The fan roars, more so when the engine is cold (all viscous fans do, I never figured that out, you'd expect it not to drive when it is cold, maybe the fluid takes a while to get the right idea?)

A very interesting device....much maligned and works a treat.



Ah, most likely the fluid was all in the outside part as the engine would have been hot when it was put away, so it takes a while to pump it all back to the reservoir, I was right, it takes a while for it to get the idea :)

If it suddenly breaks, go back to the last thing that you did before it broke and start looking there :)

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