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Author Topic:   Merc 6,5 &4 hp nil differences

fisherman posted 05-09-2007 07:33 PM ET (US)
Need some expert advice.
Just purchased a new Merc 5hp 4strML and note it's rpm range is 4500-5500 while the 6 is 5000-6000 yet they both have the same bore/stroke 59/45, same disp 7.5/123 and same gear ratio 2.15.1. Question: what does the 6 have that the 5 does'nt to give it the added 500 rpm's. The same applies to the 4hp which is identical in every respect to the 5hp.Is mercury spoofing everyone with their hp ratings?
Thanks
DaveS posted 05-10-2007 08:29 AM ET (US)
I've had that same engine for a kicker a couple of years now...althought I think my brother has used it more than me...what are you attempting to do with this? When I was doing my research prior to purchasing this engine, I was told, by more than one person, that for what I was using it for...(1989 17' Newtauk kicker), there would not be a marked improvement between the 5hp and 6hp because I couldn't use these engines to push my boat up on plane...so for me, the 5hp was a perfect fit...now I've heard the smaller (1 cylinders) vibrate a lot so you might actually like the smallest 2 cylinders, (I think they start at 8hp...more $$$ but won't shake as much...)
Good luck...
DaveS
The Judge posted 05-10-2007 12:42 PM ET (US)
Boating mag just did a 6hp shoutout and Suzuki won for whatever reason. It was interesting to see how they critiqued them...c'mon it's a 6hp.
Yes it is an identical engine that has 3 different hp ranges but then again so do most engines. Back in the days they all made a 90/115/140 from the same engine. That is a big difference in power from the same engine. How do they do it? Basically carb jetting and port size. The bigger the jets and ports, the more gas & air, the more hp. This also may effect the redline as higher strung engines usually make the hp at a higher range. Therefore I also think a 90 will have more low end grunt than a 140 comparitively speaking. HOWEVER I feel it also effects longevity of the engine. If a 1.7L engie can make 90hp or 140 which should last longer? This is also true for kickers and why you see most use 9.9 instead of 15's. The 15 has an extra 50% hp but at a higher rpm which you normally don't see trolling or pushing a sailboat. The 9.9 probably also has more grunt to do the job. OMC And Merc never made a 15hp sailmotor(25") but they did have a 9.9.
Do you feel spoofed as a consumer? If they made a different engine for each hp, engines would probably cost 50% more and parts would be harder to find. Mercury uses the same lower unit(different gear ratios and shaft lengths) for all their V6 outboards and alpha drives...keeps the cost down.
fisherman posted 05-10-2007 02:26 PM ET (US)
DaveS:
Using the 5 hp on my Montauk 170 as a kicker for primarily trolling. The dealer pre-tested it for me and I thought it was pretty smooth even tho it's only one cylinder.
The Judge:
Thanks. I kinda figured it had to be in the carb. I would have preferred a 8 or 9.9 but their almost twice the weight of the 5 and consequently I'd in all probabilties feel like I was riding side-saddle or with one foot in the furrow, so to speak.
Thanks for the advice.
Ray
an86carrera posted 05-10-2007 11:45 PM ET (US)
Judge;
Always pushing Suzukis, how do they pay kickbacks? I would like to get involved.
Len

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Author	Topic: Merc 6,5 &4 hp nil differences
fisherman	posted 05-09-2007 07:33 PM ET (US) Need some expert advice. Just purchased a new Merc 5hp 4strML and note it's rpm range is 4500-5500 while the 6 is 5000-6000 yet they both have the same bore/stroke 59/45, same disp 7.5/123 and same gear ratio 2.15.1. Question: what does the 6 have that the 5 does'nt to give it the added 500 rpm's. The same applies to the 4hp which is identical in every respect to the 5hp.Is mercury spoofing everyone with their hp ratings? Thanks
DaveS	posted 05-10-2007 08:29 AM ET (US) I've had that same engine for a kicker a couple of years now...althought I think my brother has used it more than me...what are you attempting to do with this? When I was doing my research prior to purchasing this engine, I was told, by more than one person, that for what I was using it for...(1989 17' Newtauk kicker), there would not be a marked improvement between the 5hp and 6hp because I couldn't use these engines to push my boat up on plane...so for me, the 5hp was a perfect fit...now I've heard the smaller (1 cylinders) vibrate a lot so you might actually like the smallest 2 cylinders, (I think they start at 8hp...more $$$ but won't shake as much...) Good luck... DaveS
The Judge	posted 05-10-2007 12:42 PM ET (US) Boating mag just did a 6hp shoutout and Suzuki won for whatever reason. It was interesting to see how they critiqued them...c'mon it's a 6hp. Yes it is an identical engine that has 3 different hp ranges but then again so do most engines. Back in the days they all made a 90/115/140 from the same engine. That is a big difference in power from the same engine. How do they do it? Basically carb jetting and port size. The bigger the jets and ports, the more gas & air, the more hp. This also may effect the redline as higher strung engines usually make the hp at a higher range. Therefore I also think a 90 will have more low end grunt than a 140 comparitively speaking. HOWEVER I feel it also effects longevity of the engine. If a 1.7L engie can make 90hp or 140 which should last longer? This is also true for kickers and why you see most use 9.9 instead of 15's. The 15 has an extra 50% hp but at a higher rpm which you normally don't see trolling or pushing a sailboat. The 9.9 probably also has more grunt to do the job. OMC And Merc never made a 15hp sailmotor(25") but they did have a 9.9. Do you feel spoofed as a consumer? If they made a different engine for each hp, engines would probably cost 50% more and parts would be harder to find. Mercury uses the same lower unit(different gear ratios and shaft lengths) for all their V6 outboards and alpha drives...keeps the cost down.
fisherman	posted 05-10-2007 02:26 PM ET (US) DaveS: Using the 5 hp on my Montauk 170 as a kicker for primarily trolling. The dealer pre-tested it for me and I thought it was pretty smooth even tho it's only one cylinder. The Judge: Thanks. I kinda figured it had to be in the carb. I would have preferred a 8 or 9.9 but their almost twice the weight of the 5 and consequently I'd in all probabilties feel like I was riding side-saddle or with one foot in the furrow, so to speak. Thanks for the advice. Ray
an86carrera	posted 05-10-2007 11:45 PM ET (US) Judge; Always pushing Suzukis, how do they pay kickbacks? I would like to get involved. Len