Cooling system drag/radiator efficiency

[aerohead]

Originally Posted by JulianEdgar

You seem to have gone onto a different topic. The OP asked about cooling efficiency, and measuring aero pressures is a simple and highly effective way of improving cooling efficiency through aerodynamic modification.

'Idealized' is part of the conversation, so we're talking about 2% cooling systems. No single modification exists within a vacuum.
If we remove 'idealized ' from the conversation ,then we've changed the conversation.

[JulianEdgar]

Originally Posted by aerohead

'Idealized' is part of the conversation, so we're talking about 2% cooling systems. No single modification exists within a vacuum.
If we remove 'idealized ' from the conversation ,then we've changed the conversation.

As far as I can see, yes, you're talking about a different conversation. I may be wrong, but I didn't see anything about drag in the original post. Just heat dissipation.

If we're talking overall cooling system efficiency (ie including drag) then I'd add throttle stop testing to pressure testing.

[aerohead]

Originally Posted by JulianEdgar

As far as I can see, yes, you're talking about a different conversation. I may be wrong, but I didn't see anything about drag in the original post. Just heat dissipation.

If we're talking overall cooling system efficiency (ie including drag) then I'd add throttle stop testing to pressure testing.

The first three words identifying the thread are
' Cooling system drag '

[JulianEdgar]

Originally Posted by aerohead

The first three words identifying the thread are
' Cooling system drag '

Ok thanks - I had missed that. So pressure testing alone won't get you to the most efficient cooling system - you'd want to add some drag measurement as well.

[Logic]

The Art of Engine Cooling: Designing Ducting Systems for Optimal Performance.
Graphs of Porsche etc's inlet and outlet duct opening to radiator ratio are shown.

https://www.youtube.com/watch?v=doP04J05QdQ&t=334s

IMHO; for practicality reasons this ties in with with engine compartment belly pan ducting where directing the air backward under the car, rather than just downward or no exit at all seems best.
https://sci-hub.ru/https://www.scien...89430497000647

It's altogether possible that grill blocking works as well as it does because there's then less of that downward rather than backward airflow..?

ie: Dropping the back of a longer bellypan may be 'The Trick'..?