Chaps,

I was fortunate enough to have borrowed a Valeo catalogue (they do rads, heater matrices etc) which has all rad dimensions, line drawings and water quantity.

I looked at Range Rover (that was all I could find with R V8 in!), and for that it quotes 12 litres.

The dimensions of the Rover 200/400 (old shape) Turbo Diesels are small enough to fit my car, and hold 8 litres.

I reckon this will be enough, given that engine will be pulling at least a third the weight of a RR.

What do you think?

Thanks

Simon

im not a thermo dynamicist, and cant even spell it.

However I do have a bit of experience in fan / rad cooling for things at work.

When you quote capacity, you are talking about the full capacity of the original car -not the rad I imagine!


The capacity isnt really relevent.

What IS, is the air temperature, the differential in temp you want from the inlet to the outlet of the rad, the rate of air flow though the rad, and its surface area.

When I have asked cooling specialists about this kinda thing, the flow rate, or volume of whats flowing, isnt a factor they ask for.


In your application, you I think will be more interested in SURFACE area of the rad. That means the area of the cores - like are there 20 rows, are they doubled up - ie one behind the other giving a double set of cores.....the more there are, the greater the dissipation.

The more air, at the cooler the temp, the more you will kick out of the rad.


For your application, I would look at the actual heat the car will generate due to power produced rather than your car being low weight. (tho its related).


I have no idea of the efficiency of an engine. Lets say that its 80% efficient and 20% is lost as heat. In a 150 hp engine (750 watts approx per hp est) thats 112 kilowatts total, and 20% of that is around 22kw. The rad needs to get rid of that.

So, engine producing 150hp in either application will produce same heat to be got rid of by the rad. Your car being lighter will require less power to propel a same speed. Wether thats linear is anyones guess!

Ideally, you need to know the kw rating of both rads, and calc the hp your car will use at norm speeds and the efficency of the engine.

Or you fit as big a rad as poss and hope.

I fitted one from a car of similar engine capacity as a best guess.

atb

steve

Use the 380mm wide Golf alloy one (can't remember the ref) it cools a V8 Westfie1d. About £45 at your local Partco

Wow!

Very impressive Steve!

I think your figures are a little out, but what you are saying is about right.

As I see it what you are saying is that, the greater the airflow over whatever volume of water your Rad carries the better! Right?


If your rad is not cooling your engine you need to increase the airflow and the water flow through the rad.

That is why larger rads are more common on saloon cars than on race cars. The greater the volume of water held outside of the engine, the better chance it has of cooling down.
If you could alter the gearing to the water pump, you could make it more efficient when idling or running slowly.
Ideally the water pump should be electrically driven so that it can be regulated to suit engine temperature and not speed.

Just my thoughts, and probably not much use to you!

Terry

As I say, I dont know that much, but I offered what I could.

The numbers were either approx or guessed so that could make some kinda point.

More impressive, is that a guy I work with's father used to own a cooling company. They designed stuff for jaguar and the cooling system(s) in the challenger tank!


atb

steve

Chaps,

Thanks for your thoughts.

FastWestie - any chance of some more details (ie part no)

Thanks

Simon

Euro car parts number 203440611
VW part no. is 171121253CJ
from Polo/Derby 1.1-1.3 83-90 & Golf/Jetta 1.05-1.3 84-92

FW, you're a hero!

Now, if someone can do the same for the Micra, I'll have all the data I need to make a decision...

DJ

FW

Thanks very muchly!

ATB

Simon

PS Just as a point of interest, I had a look at the rad that Westfield supply - £312!!!!!

Fast Westie's suggestion of a Polo rad is good with conventional 4 pot motors (capable of keeping a 250bhp motor cool), but the general consensus on the Westfield forum is that it has no hope of cooling a V8 powered Westy. Even in standard form, a V8 creates an enormous amount of heat, which the Polo rad is not capable of dealing with.

HTH Stu.

quote:

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Fast Westie's suggestion of a Polo rad is good with conventional 4 pot motors (capable of keeping a 250bhp motor cool), but the general consensus on the Westfield forum is that it has no hope of cooling a V8 powered Westy. Even in standard form, a V8 creates an enormous amount of heat, which the Polo rad is not capable of dealing with.

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Have a read of ....this....

Cheers, Stu.

Stu,

Reckon that'll do nicely!

Cheers very much

ATB

Simon

I can vouch for Radtech in Cannock.
They rebuilt my Toyota Spacecruiser Rad which leaked like a sive(?).
Cost about £90 as opposed to the £250 that Toyota wanted.

Terry

quote:

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Have a read of ....this....

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Just spoke to GSF, the part no 17333 (RADIATOR-430mm G2 1.6 Carb 8/83) is also listed for the Golf GTi.

Think that might be the one!!

Any comments before I order (sometime tomorrow)

Thanks

Simon

Simon,

In my experience the Golf radiators are wider than the Polo ones. The former are more rectangular, while the latter are nearer to a square shape.

From Eurocarparts:-

Part no. 203440611 is listed as Golf/Jetta/Passat
Part no. 203440491 is listed as Polo 83-90

I'm pretty sure they're different. I'm using the Polo on and it fits fine. See this link for a couple of photos.

Cheers,

Eddy

Eddy,

Thanks for your comment.

Is your radiator one of the 380 or 430mm wide rads.

The reason I ask is my chassis is 4" wider than book, so think I may (need to check my measuring) be able to have a rad up to 530mm wide.

Thanks again

Simon

Don't get caught like I did!

I bought the narrower Polo rad, and although the core may be 380mm the entire width is 520mm when you include the plastic bits on the side.

I believe the wider rad is 600mm overall.

Best to take a tape measure to your nosecone before you buy!

David

quote:

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Originally posted by David Jenkins
I bought the narrower Polo rad, and although the core may be 380mm the entire width is 520mm when you include the plastic bits on the side.

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