Home
Basic Dirt Bike How-To's - Video
Dirt Bike How-To's - Video
Living The Moto Life - Video
Bike Tests | Shoot-Outs - Video
Forums
What's new
Latest activity
Log-In
Join
What's new
Menu
Log-In
Join
Navigation
Install the app
Install
More options
Close Menu
Forums
MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Switch from Pump to C-12
Reply to thread
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Message
[QUOTE="fishhead, post: 598108, member: 18565"] I'll take a stab here. The evap curve is provided to let the tuner know what the physical properties of the fuel are. A fuel with a fairly high initial evap point might be best used in a 4 stroke with higher inlet tract temps as the evaporation provides cooling to the intake tract, valves and piston crown. This property enhances cylinder filling. This is a good thing. As an extreme example fuels with a very high initial evap points are often used in turbo applications because low evap point fuels are less ideal as evaporation produces expansion which interfers with cylinder filling and robs power. Not a good thing. The end point is important because if the fuel in the combustion chamber does not get to the end point of the evap curve prior to combustion then there is unburned fuel wasted in the combustion process. Again, this is not a good thing. So the temerature characteristics are different for different applications. Matching the temp charateristic of the fuel and engine is a good thing. This is one reason there are so many different flavors of fuel out there. Generaly speaking offroad 2 strokes prefer a fuel with a fairly low initial evap point. A fuel with a too high of an initial evap point kills throttle response. This is what usually occurs with octane boosters. I know very little about this subject so if anyone can further enlighten me on the subject or correct my misunderstandings please feel free to do so. Gasoline is a homogenous mixture of different molecules, kinda like Jim Beam, The more volatile or lighter fractions evaporate first and so on. If you heat up your Jim Beam the alcohol will evap first then the water and finally the brown goo from the charred oak barrels that give it color and flavor. [/QUOTE]
Verification
Which ocean is California closest to?
Post reply
Forums
MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Switch from Pump to C-12
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
Accept
Learn more…
Top
Bottom