Radiators FAQ

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What are the advantages in buying an aluminium radiator and what gain in performance will I see?

You will see three main advantages:

  1. Performance. Superior core make up and design
  2. Appearance. Aluminium radiators don’t require painting which allows the natural alloy finish to remain. This also gives the option to polish the radiator to near chrome appearance.
  3. Weight. Aluminium radiators are often one third of the weight of a conventional copper brass radiator. Anything that is physically lighter is thermally more effective at dissipating heat.

Will my vehicle need to be modified to fit a PWR radiator?

PWR manufacture a range of OE replacement radiators which mount into existing cars with no modifications necessary. There are also a range of radiators which will also mount into original mounts, but may not accept standard fans instead offering a superior fan.

My mate runs a 5 Row copper radiator in his car. Can I run fewer rows in my application with the alloy rad?

The lighter aluminium is not the only reason for more efficient heat transfer. This is also achieved with the use of larger, wider tubes. This in turn means fewer wider rows. This promotes a larger rate of cooling airflow over the tubes, particularly at low vehicle speeds. This sees greater tube to fin contact and also which is essential considering the Fins do over 90% of the heat dissipation. So yes, you can use fewer rows with an aluminium radiator.

Will my radiator rust out quicker than a normal steel Copper type?

All late model manufacturers have chosen aluminium radiators as they simply outperform and outlast copper brass type radiators.

Is it better to use a ‘cross flow’ radiator or a ‘vertical flow’ type?

Whatever orientation gives a longer tube is best. If the radiator can be made wider than it is taller, then it should preferably be cross flow. If it is tall such as many early model cars, the rad should be vertical flow. This sees the longest water tube length possible and maximising core area inside of the space available in your vehicle or application.

What is stray current and how will it effect my car fitted with an alloy radiator?

Stray current is basically a ‘short’ or electrical fault in one of the vehicles electric circuits causing voltage to be present in the radiator coolant. In other words, the engine is trying to ‘earth’ to the body though the coolant as this is more conductive than the earths on the vehicle.

This stray current will begin to erode the cooling system including cylinder head(s), water pump, thermostat housing and of course the radiator. Often the radiator will show the first signs of this erosion as it lightest / thinnest material of the cooling system.

Note: Refer to PWR Notice to Owners

Should I fit a Thermo Fan to my Radiator?

As a general rule, the standard engine fan in most cases will be effective at generating the required cooling airflow. However, engine fans sap power from the engine hp and quite often provide more airflow than is actually required at high engine speeds (except in the case of a Burnout vehicle where there is never too much airflow).

On the other hand in traffic Jams we see the Idling Engine fan simply not able to pull enough air and we have all seen cars over heating in Traffic. A Thermo fan will offer consistent airflow at all vehicle speeds and result in more stable cooling.

I already have 2×10” Fans can I use those on my F100 Radiator and can I zip tie them on?
Zip Tying the fans on through the rad core should be avoided at all costs. Tying of fans through the core will often result in premature failure of the core.

In relation to your 10” Fans we should compare their CFM rating against other sizes available. Some brands we see a single 16” flow four times that of a 10” fan!

If PWR doesn’t have my radiator or cooler on the Product Catalogue, what can I do?

Use the PWR Drawing Details form below to start the simple process of ordering a custom unit to your specific requirements or arrange with one of our sales team to send your sample to us together with the PWR Sample form (see download below) filled out and attached so we know whose sample it is and what it is for.

PWR Drawing Details Form
PWR Sample Details