Two question on my active grill block?

[Phase]

Bought some coroplast. Will be painting it black and I’ll be attaching it over the little grill opening using heavy duty velcro so I can remove it and put it back on easily Incase I’m going to be going somewhere warmer during a trip

[redpoint5]

Bought some coroplast? This is the season of free coroplast, lol.

[Phase]

Originally Posted by redpoint5

Bought some coroplast? This is the season of free coroplast, lol.

It was 7 bucks at Home Depot. Blank slate is easier to paint. I’ll use some left over coroplast for other experiments too

[aerohead]

Originally Posted by Phase

Ok I’ll probably block off the little lower opening. If it gets too hot the upper grill will open anyways ( that happened this summer driving thru Arizona mountains in black car)

I’m assuming no aero benefit though since it’s such a small area?

That lower opening may constitute the actual forward stagnation point, and highest static pressure on the car.
If so, the actual air volume through there may be disproportionately high, considering its 'size.'
The upper grille may be exposed to accelerating ( pressure-reducing ) flow, as the Lanchester/Prandtl surface if discontinuity forms around the nose.
Just watch your temperature gauge.
Engine warmup has as much to do with the thermostat operation and internal plumbing, as it does with cooling air flow.

[Phase]

Originally Posted by aerohead

That lower opening may constitute the actual forward stagnation point, and highest static pressure on the car.
If so, the actual air volume through there may be disproportionately high, considering its 'size.'
The upper grille may be exposed to accelerating ( pressure-reducing ) flow, as the Lanchester/Prandtl surface if discontinuity forms around the nose.
Just watch your temperature gauge.
Engine warmup has as much to do with the thermostat operation and internal plumbing, as it does with cooling air flow.

so there should be some type of aero benefit for blocking off the lower splitter grill even though it's so small?

and ill only be doing this grill block in winter weather here and will take it off in late spring. worst case scenario, is that the upper shutters should actively open if things get too hot, even in winter, right? as long as everything is functioning properly, i should be set?

[freebeard]

so there should be some type of aero benefit for blocking off the lower splitter grill even though it's so small?

Just watch your Lanchester/Prandtl surface discontinuities.

[ConnClark]

Originally Posted by Phase

so there should be some type of aero benefit for blocking off the lower splitter grill even though it's so small?

and ill only be doing this grill block in winter weather here and will take it off in late spring. worst case scenario, is that the upper shutters should actively open if things get too hot, even in winter, right? as long as everything is functioning properly, i should be set?

I think there could be aerodynamic detriment to blocking it off. A high static pressure being relieved can reduce drag if done right.

Also a 100% block is asking for trouble at some point. Engine coolant temps are used for controlling the cooling fans but other systems like electronics are stressed by higher under hood temps.

[redpoint5]

Except, active shutter would open if temps increase.

[ConnClark]

Originally Posted by redpoint5

Except, active shutter would open if temps increase.

Not if they aren't monitored. As I stated engine coolant temps are often the only thing monitored. Reduced airflow increases under hood temperatures for other systems that are not monitored because they don't need to be as the car was designed.

[redpoint5]

Other components aren't monitored because excessive temps would first manifest in coolant temperature increase, most likely.

Are you recommending against grill blocking?