91 octane

[tundrabeagle3]

anybody running 91 octane in their 5 hp briggs please chime in on the mods u had to do to make it work.

 

[kendelrk]

91 gas is nothing, with your mods you way lean, go up a couple of jets and youll notice the same thing, 91 octane really isint needed. if you really want such amazing power and such why not just get a torque converter?

 

[tundrabeagle3]

torque converters are like $200 bucks , i would rather get a 4 speed pit bike if i wanted to spend alot of $

 

[devino246]

i know every body keeps telling me the same thing but i know i felt a huge difference in performance when i ran 91 octane. i even had to let go of the throttle because every thing started to get blurry

It's ALL in your head. Chemistry isn't wrong.

 

[tundrabeagle3]

ive heard that before and its not true. u guys need to try it before u say its all in my head, theory and real life can be different.

 

[devino246]

ive heard that before and its not true. u guys need to try it before u say its all in my head, theory and real life can be different.

It's not theory, it's tested scientific fact. At most, 91 octane has a 3-4% difference in BTU content, and that would only be from a difference in ethanol content. You can't feel a 3-4% difference.

 

[tundrabeagle3]

i felt a huge difference but i do have kinda low compression , i used a compression tester and had less than 50 psi

 

[devino246]

i felt a huge difference but i do have kinda low compression , i used a compression tester and had less than 50 psi

Test it again, but spin the engine backwards to defeat the compression release.

 

[tundrabeagle3]

i would but i already returned it, if i am running lean then how did my plug get fouled when i ran 91?

 

[Doc Sprocket]

Do you think you're running lean, or did you perform the appropriate test and determine that you're lean?

A real modification that will take advantage of hi-test fuel would be a large increase in compression.