It would definately be better for it to have a good supply of fresh air.
This will have the double effect of improved air flow for combustion purposes plus cooler running of the engine as the inlet air is cooler.
If you starve an engine of air the combustion gets too rich and the temperature rises. This in conjunction with hot air being supplied can lead to temperatures outside the operating range and possible seizure.
Also cooler air is denser so you are getting more oxygen into the engine per stroke and once again better performance.
It is really a win-win situation. I would only become concerned if you were forcing more air into the engine than it was designed to take ie turbo-charging or supercharging.
Make the most of your new found performance and advise all your freinds that engines need a good supply of fresh air! |