JustAnotherSpearo wrote: Some of you guys who criticizes others inputs are part of the reason I can't be bothered putting input in half the time and often just end up reading. The more often do you it the more people you drive must away.. I can't be the only one.. And I'm about as far from a mechanic as possible. However I have spent a heck of a lot of hours onboard small boats and driving them in some seriously snotty conditions this summer has been great fun playing with the 7m hardtops coming back in from out wide when its chopped up and blowing 20knots + and that comes down to experience and understanding the local water movements. I know for a fact I can drive the boats im used to considerably better than most. I'm not a boat operator by trade. I know our outboards in and out, and I know what the common faults with them and am yet to have to call the guardian angles for a tow home and have had many oopsies that required some thinking to get home. It only takes one look at Steps commander to understand that the man looks after his equipment and uses it a lot. You'd have to be a fool to disregard and take the mickey mouse out of years of experience, time is something we all are limited with. Learn lessons from others and apply common sense to what they say to figure out how reliable it is. Regarding the topic, stuff a 100hp Honda in my eyes. the 95 octane would throw me off just because of the extra 15cents a litre. Weight difference isn't a real matter in the grand scheme of things. Servicing is an issue, but also can be a bit of a scam, lets be real your average joe isn't likely to encounter problems during the warranty period.. but it is piece of mind that cons us all into it. 4 years with Suzuki, faulty trim switches on the outboard from a poor design with the seal through to the little 25hp 4 stroke not having the robot at the factory connect the throttle cable up correctly forcing it to get stuck at 3000 odd rpm on the first outing. Every outboard can have issues, biggest thing that causes problems is the user and operator with a lack of maintenance and care. Personally Mercs have had a bad run in our family, black anchors as such. Probably just struck a bad one for the 4 hours we got to use it as a loan motor. Just thinking about the choices, Merc have developed their 90-115hp range considerably in the last 4 years from where they were. (weight wise and what not) Honda no real developments since we purchased in this hp bracket just whipped out the 100hp outboard, still the same block though.. Back to the point. Mercs have spent time developing and advancing their product, could be a bad thing, could be a great thing. Someone has to be the test pig
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Steps wrote: I've never been a huge fan of the highest output model of a given block. For example in the Hondas, the 80, 90, and 100 are all the 1.5L inline 4. Aside from just revving it a bit more, it would be interesting to know what, beyond an ECU calibration, has been done to get 20 more hp from the 100 over the 80. I always wonder if it just makes for a more highly-strung, slightly less reliable motor. A engine of a given volume requires a mixture of a given volume..at a very close AFR (air fuel ratio). and that proportion of the ratio which is fuel has a given amount of potential energy stored in it. This amount of energry can be increase by raming ( turbo/ blower ) more fuel mixture under pressure in effect increasing the volume of the engine... but this is not the case here. By changing cam profiles.. how lomng the inlet is open. how long the inlet and exhaust are open at the same time oine can change the amount of fuel mixture in the chamber , and the compression pressure.. then ( see previous bofin post on octane , cylinder pressure , time of flame across the cylinder timing and metering (carb or injection) These variable therefore change the amount of hp/ torque at any given rpms. In saying that , I do not understand the justification huge difference in price between hp models outside simple profit taking.. |
Rozboon wrote:
To be honest I suspect 99% of the motor is the same between the different horsepowers. I would wager a shiny penny that the major difference is the tune loaded on the ECU. Run the 80hp a little fatter, don't advance the timing as much; conversely run the 100hp closer to the knock limit. If they have to be run on 95 octane they're probably already a little bit knock-prone. I can sit there with my car on a dyno and dial up virtually any power level I want by mashing + and - on a laptop, and I bet you with these motors that are running such similar blocks that's just about all they do. In fact, because I'm a giant nerd, I went and looked up the US market parts on a Honda 75, 90 and 100, the actual important bits that kinda affect how much power you make (pistons, crankshaft, cams, cylinder head, manifold, injectors) the only difference was the 75 uses a different cam and the 90 has a very slightly different part number for the cylinder head (75 and 100 use the same head). Same gearbox too. Read into it what you will but to my mind all the difference in power output is going to be due to the tune loaded onto the ECU, therefore it's hard to escape the appearance that they're all virtually the same motor and the 100 is just being run harder. |
Tonto2 wrote: ffs killmeknow |
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