I take my hat off... If you can daily drive your 800hp blown mustang with regular gas and have no problem with detonation :cheers
I do agree... if your bike/car is stock, there is no reason to run higher octane that what the manual says
Its actually about 1000 at the crank........peak. I have a few things helping me run pump gas...........the first being at 1 mile elevation wich is a 20% loss in power and a 2-2.5psi loss in atmospheric pressure. I may have a block that has mechanical compression of 8.5:1 but the dynamic compression is much higher. (think how nascar can get giant numbers out of a small block even for stupid ********) But now you take into consideration of my atmospheric loss and you see why I am able to run my pump gas.
Next is load, my car doesnt get a trailer tied to it up a hill in into the wind so it never really sees a huge load. Id burn the tires off before it did. Also selecting the right gear for the job spreads the BMEP over a broader area. Higher RPM in a lower gear gives a better torque multiplier through the transmission.
Horsepower is not an indicator of fuel requirments (octane speaking) its merely a math function of torque times RPM divided by 5250
Load, combustion chamber efficiency and cooling efficiency dictate the octane required.
V8 engines with two valves are unlikely to be run at 14.0:1 (maybe NHRA??) as the cylinder head is inefficient compared to a modern hemispherical combustion chamber with 4 valves.
Also, the minute you change from a cast iron cylinder head to an aluminum (on american cars) you can increase your compression safely as it cools much better. (I dont remember the coefficient numbers of cast iron to aluminum in cooling properties)
Octane is nothing more than a math number = to resistance of detonation aka burning. The higher the octane the harder it is to ignite and the slower the flame front will actually travel. So gram for gram there is really no more power to be had in the two different fuels at the pump but because your engine doesnt require it to run well its being wasted. You want more compression to utilize the resistance of burning. Think of fuel as nothing more than a source of BTUs. The lower octane is easier to extract the BTUs out of a stock engine than the higher octane.
SO ONE MORE TIME FOR ALL YOU KIDDIES:
USE THE LOWEST OCTANE YOU POSSIBLY CAN IN ANY ENGINE YOU HAVE.
Youll save money, make more efficient power and be much much wiser.
You can send all your paypal donation inquiries to my private message box. I figure I can save most of you over a hudred bucks this summer so one dollar per person should suffice.
Last I heard, Charles Schwabb wasnt doing any investing for 1%