This thread is a continuation of a hijacked thread.
Original thread-
http://www.tigeowners.com/forum/show...317#post758317
ericinmich said-
D&P - One thing that impacts the CO is how rich and engine is running so that may make some folks experiences different than others.
With modern cars/trucks (say last 20 or more years) if the engine is running correctly the risk of CO poisoning is just about zero. If you ran a car in an enclosed space (garage) there is a better chance of dying of CO2 depletion (lack of O2) than from CO poisoning. Engines run at a lambda of 1 with slight perturbations rich and lean to "fill" the catalytic converter first with excess O2 (lean) then with slightly rich so the converter processes all the bad stuff. There is essentially no CO coming out of the tail pipe.
On to boat engines. Going way back they had carburetors and could easily be running rich enough to produce dangerous CO. Their controls were all open loop and crude, with error on the rich side for engine safety and power. More recently they added open loop fuel injection (this is what my boat uses). They still didn't run at a lambda of 1 (no O2 sensor) but they ran much more consistently. There was likely boat to boat variation but in general, unless at higher loads (power) they ran close to lambda of 1, not much CO produced. Next came engines with catalytic converters, some with switching O2 sensors, and now some with wide range O2 sensors. With switching sensors they likely ran almost all the time with a lambda of 1 and CO/HC/NOx being processed in the converter so no CO risk. Wide range O2 systems likely run about the same as switching, or they would trash the converters on the engines, so again not much risk.
Yes, there have been been engines that put out CO. I have not heard of any issues with modern engines (fuel injection and converters). Just like modern cars, unless they are running poorly, warning lights on yet driver keeps going, it just can't happen... IMO
As a derail, I spent 30 years in engine controls, SW/Cal/HW, which is really keeping me from upgrading boats. Something about a small block GM engine with simple open loop controls, vs. the major step up in complexity of a Ford 6.2 Raptor with catalytic converters and wide range O2 sensors.
Original thread-
http://www.tigeowners.com/forum/show...317#post758317
ericinmich said-
D&P - One thing that impacts the CO is how rich and engine is running so that may make some folks experiences different than others.
With modern cars/trucks (say last 20 or more years) if the engine is running correctly the risk of CO poisoning is just about zero. If you ran a car in an enclosed space (garage) there is a better chance of dying of CO2 depletion (lack of O2) than from CO poisoning. Engines run at a lambda of 1 with slight perturbations rich and lean to "fill" the catalytic converter first with excess O2 (lean) then with slightly rich so the converter processes all the bad stuff. There is essentially no CO coming out of the tail pipe.
On to boat engines. Going way back they had carburetors and could easily be running rich enough to produce dangerous CO. Their controls were all open loop and crude, with error on the rich side for engine safety and power. More recently they added open loop fuel injection (this is what my boat uses). They still didn't run at a lambda of 1 (no O2 sensor) but they ran much more consistently. There was likely boat to boat variation but in general, unless at higher loads (power) they ran close to lambda of 1, not much CO produced. Next came engines with catalytic converters, some with switching O2 sensors, and now some with wide range O2 sensors. With switching sensors they likely ran almost all the time with a lambda of 1 and CO/HC/NOx being processed in the converter so no CO risk. Wide range O2 systems likely run about the same as switching, or they would trash the converters on the engines, so again not much risk.
Yes, there have been been engines that put out CO. I have not heard of any issues with modern engines (fuel injection and converters). Just like modern cars, unless they are running poorly, warning lights on yet driver keeps going, it just can't happen... IMO
As a derail, I spent 30 years in engine controls, SW/Cal/HW, which is really keeping me from upgrading boats. Something about a small block GM engine with simple open loop controls, vs. the major step up in complexity of a Ford 6.2 Raptor with catalytic converters and wide range O2 sensors.
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