Papa78 wrote: Thanks all for your comments. Along with other conversations I'm veering toward the Merc (for Extreme 545). Bob, have seen your posts re props etc - may PM you with a few queries. |
Joker wrote:
I have the Merc 90 version of the same block but with the command thrust bottom leg - basically the bottom of a 150hp and run it on a FC560 c/c and more than happy with the performance of it. Done over 300 hours in 2 years without missing a beat. |
Steps wrote: Honda guys at the show said it ideally should run on 95 octane - points to the highly tweaked nature of the engine ? IF 95 is what the manual says.. keep in mind the USA rates octance as an ave, unlike most of the rest of the world.. US 95 is closer to our 91. Octane is determined by the cylinder pressure (not compression ratio) at point of firing ATDC at optium piston height /timing position. Higher the pressure higher the octane required As to weight between engines.. take say a V4 and a V6 (random brand) difference say 25 kg. Now apply that in practical terms.. difference being less than the live bait tank full.... yep will have a little difference in a say 4m boat.. a 5.5m.. nah.. you will not even notice anything at rest either |
Catchelot wrote:
Joker can you explain why you have done this, what is the advantage? Longevity of the lower leg/gear box, etc? What does a command thrust leg do? Cheers
|
Papa78 wrote: "I've never been a huge fan of the highest output model of a given block" I get the logic but take the view the Merc 115 in a similar position is less of an issue - more a case that the 90 & 100 are relative outliers at 2.1 litre. A Yamaha guy at the show admitted their 135 is pushing the limits of tweaking their 1.8 litre block! |
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