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Author Topic: Radiator Shroud  (Read 264 times)

rosinante

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Radiator Shroud
« on: September 15, 2021, 05:36:32 PM »

Hi , does a radiator shroud increase cooling efficiency ?
Cheers
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Correus

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Re: Radiator Shroud
« Reply #1 on: September 15, 2021, 05:40:18 PM »

Good question... I always assumed they were there to help keep you from cutting your fingers off!

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rosinante

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Re: Radiator Shroud
« Reply #2 on: September 15, 2021, 07:11:58 PM »

I  have just google this , it would seem that it is only effective if the fan is on engine side of rad , makes sense ensures air is drawn across the whole of the rad , as mine is a push fan probably not make much difference ,I think the fan  I have fitted is restricting flow , cools ok when running but seems to be on a lot , back from an errand today the engine was being maintained at 85 ish with fan   running , the smiths capillary gauge and an IR thermometer  similar , measured at thermostat housing , the Smiths fitted to front heater hose port , need to get an electric fan with less restriction to air flow to the rad ,
Chris
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A-Ro

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Re: Radiator Shroud
« Reply #3 on: September 15, 2021, 07:27:16 PM »

More to the point are radiator shrouds readily available? Although I’m missing one on both I’ve only really looked for one for the six pot and I didn’t have a lot of joy.
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Correus

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Re: Radiator Shroud
« Reply #4 on: September 15, 2021, 07:27:50 PM »

I  have just google this , it would seem that it is only effective if the fan is on engine side of rad , makes sense ensures air is drawn across the whole of the rad , as mine is a push fan probably not make much difference ,I think the fan  I have fitted is restricting flow , cools ok when running but seems to be on a lot , back from an errand today the engine was being maintained at 85 ish with fan   running , the smiths capillary gauge and an IR thermometer  similar , measured at thermostat housing , the Smiths fitted to front heater hose port , need to get an electric fan with less restriction to air flow to the rad ,
Chris

You don't have a fan between the radiator and motor, attached to the front of the motor?

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rosinante

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Re: Radiator Shroud
« Reply #5 on: September 15, 2021, 07:45:40 PM »

No , the mechanical fan has been removed a spacer ring machined and pulley refitted , it's carried under the seat with a spanner incase of failure of the electric thermostatically controlled fan fitted in front of the rad ,
Chris
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geoff

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Re: Radiator Shroud
« Reply #6 on: September 15, 2021, 07:48:38 PM »


Just idle curiosity why have you replaced the original fan with electric ?  ( no judgement here of course )
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Genem

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Re: Radiator Shroud
« Reply #7 on: September 15, 2021, 08:04:02 PM »

There are some good reasons for putting an electric fan in place, starting with the effort required for the engine to twirl the fan about  ( I'd be interested to hear what power that uses? Is it a real saving or motor-myth?) and the additional time taken to get the engine warm in cold weather.  For those off-roading petrol vehicles the ability to switch the fan off in deep water to prevent excessive splashing in the engine bay is valuable. Another reason could be an engine conversion where there is limited space for the conventional fan - a Tdi in a Series works easier with a thin electric fan fixed to the radiator ? - that is whats happening with my ambulance conversion. Suitable electric fans and controls can very cheap from scrap-yards...

On the negative there is the chance an electric fan could fail, a mechanical one is far less likely to have issues.
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Clifford Pope

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Re: Radiator Shroud
« Reply #8 on: September 15, 2021, 08:17:35 PM »

A fan in front of the radiator normally only blows air through the circle of the fan itself, assuming no shroud. A fan on the engine side with a shroud will draw air through the whole of the radiator.
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Correus

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Re: Radiator Shroud
« Reply #9 on: September 15, 2021, 08:37:28 PM »

More to the point are radiator shrouds readily available? Although I’m missing one on both I’ve only really looked for one for the six pot and I didn’t have a lot of joy.

Don't know if the one for a 6-pot is different, but here's the part number I have - 577342.  They seem to be readily available.  Not sure if the dealers in the UK do this, but here in the States you can get a kiy that contains the shroud and the cowl.
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rosinante

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Re: Radiator Shroud
« Reply #10 on: September 15, 2021, 09:14:46 PM »

In reply as to why an electric fan , all modern cars have them , even land rovers, my V8 90 had a viscous fan to reduce power consumption when cold , so basically it's to reduce fuel consumption , decrease warm up times , or allow a tiny bit more per to the wheels. So it made sense , in my case the shortcoming is the fan itself being one from a scrap car which conveniently had a surround that fitted snugly behind the grille. I will be visiting local scrappy to find a fan that has less restriction in its surround , or one that can be mounted only on metal rod legs. It seems shrouds are rare and expensive so will better engineer current set up ,
Cheers
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Wittsend

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Re: Radiator Shroud
« Reply #11 on: September 16, 2021, 12:14:44 PM »

Back in the day when Kenlowe first started their advertising claimed 12% power increase and fuel saving.

Advertising standards have "watered" these claims down.

Electric fans do save engine power and fuel and allow the engine to warm up quicker from a cold start, thus saving engine wear.

Anyone in doubt to the "over cooling" of a military 8 blade fan going at full chat should just feel the hurricane blast of air going back over the engine. In winter I have no need of a heater in the LWT, the hot air keeps the bulkhead warm (and me).

(This cooling was there for when FFR vehicles were stationary for long periods of time and charging the batteries.)



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