Mentalpause

Has that owners manual completely fallen apart yet? I was pretty sure it said 91, 87 in a pinch. I didn't buy that premium just because I liked the price better.

Knot 4 Me

I wonder why Merc changed the requirement? I mean, I know from running these motors they don't build al lot of boost and you really have to get into the upper RPM range before the boost gauge would move but I would be nervous running 87 octane in any blower motor.

Mentalpause

87 in a pinch to me means my choice is either buy 87 or run out of fuel before I get home. Then first chance I get fill with 93. The 300s say they will accept 87, right along saying use 92 for best performance. I wouldn't run either with 87, especially if all you can get is 10% ethanol.

jeff32

All good points! Seems like some are playing with luck sometimes....

Thansk for your info guys! It tells me it is not the right boat for long on water boat trip, and that was the real question!

Rbesola

I built 600sc clones and turned the boost up for the stock 4-5psi to 10-11psi and can still put a little 87 in it if I think I need some and can't find 93. Don't think I'd run it empty and fill it with 87 but at 200hp less I would think it shouldn't require that high of octane. I don't run it super hard if I do put lower octane in it though

ICDEDPPL

iTrader: (1)

You mean never got above 3000rpm and have a buddy pull you on plane? Yeah you might be right.

10-11 psi and you mix in 87 on a heavy V bottom on a river ? Are you running 5.0:1 compression?
My BS meter is going off on you two fellas

Rbesola

7.6:1 doesn't start building boost til close to 4k. Like I said I won't run it very hard if I have lower octane in it