Why do you need to use a fan while dyno testing your car?

sport car videos youtube image

Tyrone Big

I've seen videos on Youtube of people testing their machine (weather its a car or sport bike) and it goes wrong and blow their engine if they don't use a fan facing their engine. Why does your engine explode when not using a fan on a dyno? Just overheating it or what? Please explain.

Thanks

Answer
its overheating. its hard to cool water off with no moving air.

Why is there now a button on YouTube shaped like a soccer ball?

I don't kn

It overlays a sound on the video that sounds like someone shoved a mic in the engine of a sports car going 200MPH.

???????????

Answer
It's the sound of a Vuvuzela. South African fans blow those things from the beginning to the end of the match. It has a decibel rating of 127 decibels which is beyond the pain threshold for hearing.

It's a traditional horn to the South Africans. But, to be honest, it really puts me off of the game. I can't hear any cheering or clapping. No atmosphere...

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