What is the better deal to ventilate an engine compartment ? To suck out the air ( by blowers ) or to blow fresh in ? Fumes from gas engines appear to be better sucked out but assuming all is fine i guess blowing in is better ?
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What's better? The way that all manufacturers currently do it. Suck out the air. Sucking it out is better. It HAS to be sucked out to get the (possible) fumes that would settle low. Suggest you read up on air vs gas fumes and how a bilge is setup with fresh air intake and exhaust fans rather than trying to reinvent what has already been determined to work best by people smarter than me.What is the better deal to ventilate an engine compartment ? To suck out the air ( by blowers ) or to blow fresh in ? Fumes from gas engines appear to be better sucked out but assuming all is fine i guess blowing in is better ?
No, it does NOT create better ventilation by blowing air in. See the reason I posted above.On the one hand i did not saw the difference if you suck the air out and with this force ( on a semi tight engine room ) new air in by vent ports or blow fresh air in and force the 'old' air out by vent ports.
One could imagine blowing in creates better overall ventilation
But i agree with your experience you have more control by sucking it when a spill occours instead trying to blow it backwards - especially if the blower hose is sitting low in the engine room .
My last 240 sundancer definitely sucked