ladaboy
New Niva Petrol Head
Posts: 10
Registered: Sept 13, 2011 14:37:53 GMT 2
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Post by ladaboy on Sept 20, 2011 18:26:38 GMT 2
Cant remember where i read about someone saying that the bonnet scoop on the niva bonnet can lead to overheating. This may be a bunch of BS or maybe there is some truth in it. Looking at the bonnet design the end vent is exposed . ( the other three are for the interior fan housing). It makes sense that when driving and the fixed fan is running (obviously) , there is a low pressure created in the engine bay in front of the fan. This allows for wind to be drawn in. This should allow for heat to be expelled through the small vent and combined with the force created by the wind blowing over the top of the vent creating a suction, thus pulling the warm air out. Fitting the scoop allows high pressure to be fed into the bonnet via the vent creating an equal pressure in the engine bay making the fan effect useless. Bearing in mind too that hot air rises , this could create an issue where heat is trapped in the upper region of the bonnet and head. The wind blowing under the vehicle may not have any effect on this due its own cyclonic forces from bumper deflection and heat caused by hot roads.
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Post by ronnie on Sept 20, 2011 18:46:37 GMT 2
Hi Mark
This I think is another urban legend. If the fan cowl is fitted the low pressure will be in front of the radiator and not in the engine bay. If the fan cowl is not fitted the most you can expect is a decrease in the fans efficiency. The small area left to the side of the heater intake will make little difference. I have no heater intake on mine and the complete bonnet intake is open to the engine compartment and there is no temp difference from what it was when the heater intake was fitted. If a scoop is fitted it will in all probability assist in driving the heat out the bottom. If you stand beside the Niva at idle when warm this is where the heat escapes.
Ronnie
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Post by jaco1978 on Sept 20, 2011 19:00:22 GMT 2
I will soon put a scoop up. I agree with Ronnie about the scoop. The main problem I can think about (especially with a bigger scoop) is that when you stand still the heat will rise from the engine through the scoop. If you then have your fan running to blow cooler wind over you will rather then have warmer air sucked in from the scoop. I'm still pondering this, but I think there is a few ways around it.
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ladanivabelgium
Veteran Niva Petrol Head
Posts: 962
Location: EU
Town: Kessel, Belgium
Registered: Nov 5, 2010 19:50:31 GMT 2
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Post by ladanivabelgium on Sept 21, 2011 4:36:57 GMT 2
had one of these on for years, and never hed any problems with it
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vincentc
Veteran Niva Petrol Head
Posts: 1,130
Registered: Mar 16, 2011 17:59:16 GMT 2
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Post by vincentc on Sept 21, 2011 9:21:47 GMT 2
Hi Jan
I take it you had to unstick the lada after that mud
Regars Vincent
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Post by ronnie on Sept 21, 2011 12:22:13 GMT 2
Hi Jan
If the cooling system has been looked after the scoop will make no difference.
Ronnie
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bobbyd
Veteran Niva Petrol Head
Posts: 575
Registered: Oct 11, 2009 11:58:35 GMT 2
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Post by bobbyd on Sept 29, 2011 13:48:52 GMT 2
I put three pieces of 100 mph/fabric tape over the vents to completely cover them when Im out in the bush to keep water out. Plenty of low range 5500rpm uphill action has never caused any temperature issues with the vents taped.
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Post by ronnie on Sept 29, 2011 14:11:08 GMT 2
Hi Bob
I maintain those vents (not Ventz) ;D have no influence on the engine temperature.
Ronnie
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Post by keithbatkins on Sept 29, 2011 14:32:41 GMT 2
High Guys, on my Intermediate Model Niva' the plastic base of the (factory ?) fitted scoop closes off half of the bonnet (hood) air intake. So I've drilled lots of holes through the base and this allows the air back through. No overheating problems so far :-) Regards, Keith and CERATOTH
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