Amazingly pointless. The blow off valve is there to release intake pressure if you have the turbo spinning and then go off the throttle suddenly. If you haven't got a turbo there's no intake pressure to release if you go off the throttle.
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The turbo increases the pressure of the air entering the engine, so that there is more oxygen inside the cylinder when the spark plug ignites it - and the piston is pushed down with more force...
No, but if the valve is intended to blow at high pressure and you have it connected to the negative pressure of a NA engine intake so it will never open. You could use a brass plug instead as this is...
You just install it like you would normally do with a turbocharged engine...the bloww-off however, won't work! :)
On a more serious note, you could go get one of those fake-BOVs, which are actually...