Originally Posted by
nonsense
And yet so many people have died from CO in cars, on boats, without noticing anything else in time.
Empirically, your logic is wrong.
My motor bike would stink my garage out and i would leave long before it gave me any ill effects.
People have left key less car engines running, but modern cars have cats, so not much smell.
The few problems i have had with light aircraft gave me head aches which turned out to be faulty exhaust and a crank vent that wasn't blowing out board and a split in the scat hose to the windscreen de misters. All very smelly.