Quote:
Originally Posted by racprops
For the past couple of decades I have found reports of super high mileage cars running on 100% gasoline vapor.
Numbers in the 80 to 120 MPG out of old V8s are most common.
Most of these old vapor systems have many faults, the biggest one being heating gasoline in a can to get vapor…which can work fine but any leakage of the vapor and boom.
A common mistake is to use the exhaust heat to vaporize the gasoline, this fails because ones the ICE IS on vapor it cools down cutting the exhaust heat and the car stalls.
The numbers do not lie, an ICE only uses about 30% of the incoming fuel to move the car, the rest is burned after the power stroke and during exhaust and is where all the heat the cooling system must handle comes from.
A correctly controlled vapor system COULD burn only what is needed to produce the power stroke and have no left over burning fuel after the power stroke.
Thus it is possible to save/not use some 60 to 70% or the fuel currently need to power the car.
That is you would only use about 30 to 40% of what you now use.
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Old V8s were lucky to ever crack 20 mpg. But let's be charitable and use 20.
Let's also be charitable ('tis the season) and say we'll save 60%, or use 40% of the 20:
20 / .4 = 50 mpg
That's a long way from 80-120 mpg. In fact it's an exponentially long way.
There must be an error in my analysis.
A little help please!