Thread: Bonnet scoop on RRC

Dear God, there's always one on these forums. Picky picky picky. If you want that kind of detailed information, go find it yourself or do some tests. You haven't seen this information yet because it's the internet, not a science magazine, and most people never do proper testing, and certainly rarely start a thread about their latest modification only to admit later it didn't work. Which is why bonnet scoop threads usually end with, "It seems to work well." (Gold Star exception: that Autospeed site where what'sisname does things properly.)

My point is that the idea is nothing new, and that it won't work without really good engine bay venting, and proving it works means having the gauge and getting the numbers. Also, things like giant whale shark mouth-stylee scoops aren't going to cause big problems in a mild climate where a radiator is usually happy. You can get away with a lot down south. If you really want to test it, you need to live up here where the weather is either hot, very hot, or mostly hot. That's when interfering with radiator airflow shows up.

But now that you've raised the bar with your expectations, please get that gauge, do the science, and report back. Thank you.

Good luck with it and have fun.

Originally Posted by blackrangie

Here is a disco from the guy the built mine

That's a nice looking scoop, but it's behind the radiator, so it's not pushing air through the radiator. Instead it's pushing air in to the rear of the engine. That would affect air pressure in the rear of the engine bay. How would it help to draw air through the radiator, or to vent hot air from the rear of the engine? Isn't the aim to have high pressure on the radiator and low pressure behind it to draw air through, or have I got this all wrong? Just trying to understand.

Originally Posted by Davo

Dear God, there's always one on these forums. Picky picky picky. If you want that kind of detailed information, go find it yourself or do some tests. You haven't seen this information yet because it's the internet, not a science magazine, and most people never do proper testing, and certainly rarely start a thread about their latest modification only to admit later it didn't work. Which is why bonnet scoop threads usually end with, "It seems to work well." (Gold Star exception: that Autospeed site where what'sisname does things properly.)

My point is that the idea is nothing new, and that it won't work without really good engine bay venting, and proving it works means having the gauge and getting the numbers. Also, things like giant whale shark mouth-stylee scoops aren't going to cause big problems in a mild climate where a radiator is usually happy. You can get away with a lot down south. If you really want to test it, you need to live up here where the weather is either hot, very hot, or mostly hot. That's when interfering with radiator airflow shows up.

But now that you've raised the bar with your expectations, please get that gauge, do the science, and report back. Thank you.

Good luck with it and have fun.

When one resorts to name calling and slander, they have already lost the debate.

Originally Posted by DiscoMick

That's a nice looking scoop, but it's behind the radiator, so it's not pushing air through the radiator. Instead it's pushing air in to the rear of the engine. That would affect air pressure in the rear of the engine bay. How would it help to draw air through the radiator, or to vent hot air from the rear of the engine? Isn't the aim to have high pressure on the radiator and low pressure behind it to draw engine through, or have I got this all wrong? Just trying to understand.

Agreed, its good looking.

Aim is to reduce engine bay heat and thus heat soak both at speed, idle and when engine is off.

Lets move over to this thread thats on the same subject and this and other questions have been discussed.

Will a bonnet scoop reduce heat in the engine bay?

Originally Posted by DiscoMick

That's a nice looking scoop, but it's behind the radiator, so it's not pushing air through the radiator. Instead it's pushing air in to the rear of the engine. That would affect air pressure in the rear of the engine bay. How would it help to draw air through the radiator, or to vent hot air from the rear of the engine? Isn't the aim to have high pressure on the radiator and low pressure behind it to draw air through, or have I got this all wrong? Just trying to understand.

Yes, you've got it, and that's the point I have been so laboriously trying to explain here. You would need to do lots of testing or be very lucky to have it work at speed, creating a low pressure at the back of the engine bay. But it is damn sexy.

Originally Posted by blackrangie

When one resorts to name calling and slander, they have already lost the debate.

Now that's funny. You just go ahead and point out where that's happened.

If only you put this much effort into understanding airflow, then we'd have a real discussion! Now, like I said, prove your scoop works instead of boarding the AULRO express train, destination: The Bottom of the Debating Barrel, regular daily service. I'd be happy to be wrong, but with aerodynamics you need proof other than the butt dyno we all usually rely on.

Originally Posted by Davo

Now that's funny. You just go ahead and point out where that's happened.

If only you put this much effort into understanding airflow, then we'd have a real discussion! Now, like I said, prove your scoop works instead of boarding the AULRO express train, destination: The Bottom of the Debating Barrel, regular daily service. I'd be happy to be wrong, but with aerodynamics you need proof other than the butt dyno we all usually rely on.

Again on the attack

Originally Posted by blackrangie

Again on the attack

Gentlemen - you both have good if not excellent contributions to make on this issue, with lots of interest in the outcome/s from the sidelines.
Join forces and conquer the world!!!