Posted by MarkB_MI on March 02, 2015 at 02:32:25 from (70.194.3.235):
In Reply to: Re: gas jumped $.40 posted by paul on March 01, 2015 at 12:57:11:
The difference between summer and winter gas is vapor pressure. Summer gas has a lower Reid Vapor Pressure than winter gas, meaning it's less volatile. In general, you can use summer gas year-round. Summer gas is slightly more expensive because refineries have less flexibility in what they blend into the fuel. The EPA, state and local agencies set a maximum RVP for fuel in a particular locality; see the page below to find what it is in your area.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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