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Author: Subject: Polo Rad - how good are they?
ss1turbo

posted on 10/9/11 at 12:54 PM Reply With Quote
Polo Rad - how good are they?

I've noticed that nearly everyone uses a Polo radiator (I'm sure a quick search will show the exact one, but its not from the largest engined variety from memory), yet as soon as piping and airlock issues get sorted, most people seem to have no issues with marginal/undercooling - or do they?

Would one cope with a 200bhp+ 3 litre engine? Or am I just being silly?





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big_wasa

posted on 10/9/11 at 01:04 PM Reply With Quote
plenty of cooling on my 150bhp zetec.

They are common as they are about the biggest (to fit a 7) of the shelf moden budget rad you will find.



[Edited on 10/9/11 by big_wasa]

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carlknight1982

posted on 10/9/11 at 01:32 PM Reply With Quote
I'd add an oil cooler on an engine that size to aide cooling





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andylancaster3000

posted on 10/9/11 at 01:34 PM Reply With Quote
+190bhp Duratec with a polo rad and it seems to be adequate even for circuit use in +25C conditions. In fact it seems to over cool if the air temp is low.

Just make sure all the that you ant to go through the rad does so by a close fitting shroud on the front of the rad and ensure the hot air can escape the engine bay. If both are done I think it would work.

Edit: we are also using an oil cooler.

[Edited on 10/9/11 by andylancaster3000]

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ss1turbo

posted on 10/9/11 at 01:56 PM Reply With Quote
I'll also be using an oil cooler, so thats handy!

Its not going into a Locost/7, but will check the dimensions against the original one that came out and see which flavour I can get away with, space wise. Looks like it might be the wider of the two and naturally will duct it sufficiently. Having a stock M22 switch hole helps as well...





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matt_gsxr

posted on 10/9/11 at 02:17 PM Reply With Quote
I think the good thing about our cars is that when we are putting out high power we also have high air flow (no towing uphill behind trucks).

Also the exit flow in modern tin-tops is often poor, whereas we generally can engineer nice flow.

So I guess that is why the humble Polo radiator seems to do the job.

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RazMan

posted on 10/9/11 at 03:34 PM Reply With Quote
My Polo rad keeps my V6 nice and cool - almost too cold in winter !
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ss1turbo

posted on 10/9/11 at 04:58 PM Reply With Quote
Just got the measurements that I need to keep to and it looks like I might just be unlucky with the VW2038 rad

I might be able to get a few mm here and there, but looks like the hole to fit it in is about 455mm wide and 415mm high...any suggestions? And before anyone suggests making the hole wider, its a pair of 4"x3" chassis rails....

[Edited on 10/9/11 by ss1turbo]





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RazMan

posted on 11/9/11 at 08:38 AM Reply With Quote
Can you angle the rad at at all? This actually increases the efficiency too





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Raz

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ss1turbo

posted on 11/9/11 at 08:58 AM Reply With Quote
Possibly - I assume you mean leaning down rather than side to side?





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RazMan

posted on 11/9/11 at 09:26 AM Reply With Quote
About 20 degrees (forward or back) is apparently the most effective angle IIRC. I suppose you could do a side angle if pushed - a lot of oil coolers seem to work ok like that.





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Raz

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