Fuel grade Excalibur 330 hp

[BigBald]

Does this octane usage of 87 versus 89 change from year to year? What about '99 - 330 hp engine?

Also, is there any long term impact to using a "higher than required" octane? The reason I ask is that during the summer we spend a couple of weeks on a houseboat. We are basically forced to use the marina's gas. I seem to recall that this is "super unleaded" which may be like 91 or 92 octane. I haven't notice any reduced performance issues.....but should I worry about some long term effects?

[scooby]

I actually had the same question on my Python and email them and received this as a response. I hope it help.


"All the engines we produce are built to run on standard 87 grade fuels. The decals have been changed to reflect this. "

[Nautiqueman]

As for the alcohol in the fuel- I have always heard to make sure my fuel is free of alcochol.. Not sure for the exact reason, but thought it was not good for the total fuel system in boats.

[skinautique]

Nautiqueman,
The alcohol will eat up your fuel pump and you will have to replace it much sooner than you would like to.

[Rick]

Basically Alcohol attracks water molecules to it (Hydrophillic). As a result when you have alcohol in the fuel there is also a certain amount of water associated with it . This then pitts Carbs and exhaust etc.

[Flyerace]

I spoke with PCM and they said use 87 octane. They will change the stickers.

[UWSkier]

Using anything above 87 octane is a waste of money on these fuel-injected engines. The biggest horror stories of running gas with alcohol in it is from 2 stroke outboards with older carb configurations. The alcohol introduces extra oxygen molecules into the mixture and can lead to cylinder scoring and compression loss. This isn't an issue with our fuel-injected 4 strokes though. If you can get gas without alcohol, do it, but if you have no choice, don't worry too much about it.