05-06-2011, 01:13 PM #1
Will a higher octane fuel help lean engine?
Just a question..
If a engine is running slightly lean will a higher octane fuel like super unleaded help correct it?
I don't wanna sound thick but I'm not too up on how fuel octane effects engines...
Any help would be appreciated
05-06-2011, 03:01 PM #2
Don't you think it will be better just to buy a FPR and up the furl pressure instead of buying more expensive gas.
05-06-2011, 03:02 PM #3
Absolutely NOT. Lean is lean. Higher octane only helps with detonation. And you only need a higher octane fuel if you are detonating!
05-06-2011, 03:09 PM #4
How do you know if you are detonating? Just for conversation/informational purposes.
05-06-2011, 03:11 PM #5
Like I say it's just a question... My r2 and c3 runs rich in the uk
So is it best just to run high octane fuel all the time then?
Detonation = pre ignition of fuel in the cylinder??? Am I correct in saying that?
I be totally honest, I know what I'm doing with modding but fueling is not ever been quite explained to me
05-06-2011, 03:15 PM #6
05-06-2011, 03:24 PM #7
Basically my question is this. I have a c3 and a r2 reprogram...do I need to run premium gasoline? Is there any way to read the knock sensor to know whether you have a detonation issue or not?
05-06-2011, 03:30 PM #8
To Allstar71, it may be a bit hard to explain detonation unless you've ever driven a really old car, before they had "knock sensors", and you have a big load on it (e.g. driving fast up a really steep hill). The best I can explain is that it almost sounds like you have popcorn in your motor. You would hear some loud high pitch pinging noises, if your exhaust is so loud that is is masking the sound it might be hard to hear. Most modern engines have knock sensors now, so what you would feel is a reduction in power as they usually pull timing out of the motor to prevent damage.
---------- Post added at 04:30 PM ---------- Previous post was at 04:28 PM ----------
05-06-2011, 04:11 PM #9
Top answer surf rider and that is just what I am after....
Thanks for the education
05-06-2011, 04:43 PM #10
Detonation is not pre ignition
Detonation occurs after the sparkplug fires. A second flame front collides with the one from the plug. When these forces hit there is a HUGE presure spike. Short in duration. Strong enough to knock pieces of the piston away or even crack the piston. Its classic sound is a higher pitch knock. The sound resinates thru the engine block. It is caused by the mechanical load on the engine. Piston to wrist pin, pin to rod, rod to crank, etc.
Pre ignition occurs before the plug fires. As the piston rises in the cylinder something ignites the fuel air early. This creates a very high pressure condition in the combustion chamber. Problem is the duration is very long. This condtions usuly does not make any noise. The engine just blows up!!!! Pre ignition causes can be, over heated spark plug, carbon in the combustion chamber, a nick in the head, or edge of a metal head gasket sticking into the chamber, etc.
Had to type this twice as I timed out the first time. Sorry for any spelling errors.
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