Ba Bonnet

[G6ET8U]

Just a question for you Goldbullet... how well does that venting you've added in the back work?

How hard was it to do?

The underbonnet temps of the XRT are crazy... every bit of ventilation can only help can't it?

Sorry waaayyy off topic but I needed to ask...

Jack

[Goldbullet]

  XR6T8_U said:

Just a question for you Goldbullet... how well does that venting you've added in the back work?

How hard was it to do?

The underbonnet temps of the XRT are crazy... every bit of ventilation can only help can't it?

Sorry waaayyy off topic but I needed to ask...

Jack

<{POST_SNAPBACK}>

Works well Jack and I didn't add them I had the bonnet made.

[seventytwo]

Fitting the terry scoop is not a good idea, the best way to control under bonnet temps is to suck hot air out, not pump more air in. A bonnet scoop will increase the air pressure in the engine bay reducing the flow of air through the intercooler and radiator.

Air flows from high pressure area to a lower one so if you decrease the pressure differential you decrease flow. To make the terry scoop work you would have to face it the other way and let the lower pressure above the bonnet draw the higher pressure hot air from the engine bay out, this intern would drop the pressure in the engine bay so increasing the presure differance between the front of the cooler and rear of the radiator and there would be an increase in air flow over the radiator and intercooler. So in total you would get a cooler engine bay, cooler intake charge and cooler water jacket temp and in the end more KW

The best place for a vent is as far forward on the bonnet as pratical where there is the greatest differance in pressure between the engine bay and the out side air flow,

of course if you are only doing it for looks, fill your boots

[ms700]

  seventytwo said:

Fitting the terry scoop is not a good idea, the best way to control under bonnet temps is to suck hot air out, not pump more air in. A bonnet scoop will  increase the air pressure in the engine bay reducing the flow of air through the intercooler and radiator.

Air flows from high pressure area to a lower one so if you decrease the pressure differential you decrease flow. To make the terry scoop work you would have to face it the other way and let the lower pressure above the bonnet draw the higher pressure hot air from the engine bay out, this intern would drop the pressure in the engine bay so increasing the presure differance between the front of the cooler and rear of the radiator and there would be an increase in air flow over the radiator and intercooler. So in total you would get a cooler engine bay, cooler intake charge and cooler water jacket temp and in the end more KW

<{POST_SNAPBACK}>

So im guessing that's why the WRC boys have huge holes/vents cut in their bonnets, with ducts straight after the radiator/IC etc, to draw the hot air out?

[seventytwo]

  ms700 said:

  seventytwo said:

Fitting the terry scoop is not a good idea, the best way to control under bonnet temps is to suck hot air out, not pump more air in. A bonnet scoop will  increase the air pressure in the engine bay reducing the flow of air through the intercooler and radiator.

Air flows from high pressure area to a lower one so if you decrease the pressure differential you decrease flow. To make the terry scoop work you would have to face it the other way and let the lower pressure above the bonnet draw the higher pressure hot air from the engine bay out, this intern would drop the pressure in the engine bay so increasing the presure differance between the front of the cooler and rear of the radiator and there would be an increase in air flow over the radiator and intercooler. So in total you would get a cooler engine bay, cooler intake charge and cooler water jacket temp and in the end more KW

<{POST_SNAPBACK}>

So im guessing that's why the WRC boys have huge holes/vents cut in their bonnets, with ducts straight after the radiator/IC etc, to draw the hot air out?

<{POST_SNAPBACK}>

Got it in one