OX66 Knock Sensor and Octane Requirements -

[fondafj]

My owners manual clearly lists the octane requirements for my 1999 225's and meeting that requirement is no problem when we trailer boat. On extended trips in water it is often difficult to find options other than just reg gas and diesel. Should extended running on 87 octane be a problem? Will the knock sensor control detonation to the point where I need not worry or is the compression high enough where this will result in detonation? My experience so far with this has been with the German electronic controls which can detune the advance timing enough to compensate for regular gas.

 

[chuckz]

Re: OX66 Knock Sensor and Octane Requirements -

What is the octane requirement for your engine?<br /><br />If your worried about it you can always add some octane booster. It's available in auto parts stores.

 

[fondafj]

Re: OX66 Knock Sensor and Octane Requirements -

Feelin' stupid --- wasn't the owners man'l but the service man'l and I was looking at RON not the pump octane number. Requirement is 86 pump octane - looks like I've been wasting $$ on premium.

 

[rodbolt]

Re: OX66 Knock Sensor and Octane Requirements -

it will actually develop less power on premium. yes the sensor will grab the timing and retard it as well as add fuel. the timing will retard and the fuel pulse width will increase. after to many pulses you will have to throttle back to allow it to reset. but it works pretty well.