100333624
Petty Officer 1st Class
- Joined
- Apr 24, 2012
- Messages
- 205
Hi all, I've decided to dump my motor ('78 mercury 800, 4cyl) and go with an inline 6 mercury tower of power 115... I just know there are some differences depending on which one I go for, and there's quite a few available in my area from 1966 - 1988! Lots!
So the first question is, I've heard that up to 1983 the mercs were 115hp at the crank/flywheel, correct?? This would mean roughly 95hp at the prop? And 1983 and after they were 115 at the prop, which would mean roughly 140hp at the crank, correct? Please correct me if I'm wrong...!
Also, what were the weight differences between those 2 models, let's say a 1978 and a 1983? I'm trying to find the best power to weight ratio motor to put on my 16' but I'm thinking 145hp at crank would be way too overpowered? I currently have an 80hp mercury 800 (65hp at prop?) and she pushes me at 40mph. I wanna get into the mid 50s, do I go with a 115 pre 1983 or a 115 after 1983? I don't wanna go with the 90hp tower because it's roughly the same weight as the 115 and so why not have 25hp more out of the same motor right? The way I see it, 115 pre 1983 is probably my better choice as it'll be roughly 90 or so hp at the prop, thats almost 30 more hp ontop of what I now have, and considering the weight differences and a high pitch stainless prop, this should get me into the mid 50s? Also, the 115 after 1983 would mean I'd have almost 50hp MORE at the prop, if I'm already doing 40mph just imagine how fast this would be, too fast don't you think? I don't wanna fly I just wanna be a bit faster then where I am and fuel efficient as well, but I guess the fuel efficiency went out the window with wanting a 115 tower of power hahah
My boat is fairly light for a 16' fiberglass, it's probably a bit over 200 lbs dry. I'm 200 lbs, my buddy is 150 lbs, plus a 15 gallon tank full and 2 small bluetop batteries and some light gear.. Probably around 1000lbs including the weight of the motor! Average load is usually with a buddy, so let's say 1100 lbs wet! What is my best choice for getting into the mid 50s? Give me some insight on this you merc gods!
So the first question is, I've heard that up to 1983 the mercs were 115hp at the crank/flywheel, correct?? This would mean roughly 95hp at the prop? And 1983 and after they were 115 at the prop, which would mean roughly 140hp at the crank, correct? Please correct me if I'm wrong...!
Also, what were the weight differences between those 2 models, let's say a 1978 and a 1983? I'm trying to find the best power to weight ratio motor to put on my 16' but I'm thinking 145hp at crank would be way too overpowered? I currently have an 80hp mercury 800 (65hp at prop?) and she pushes me at 40mph. I wanna get into the mid 50s, do I go with a 115 pre 1983 or a 115 after 1983? I don't wanna go with the 90hp tower because it's roughly the same weight as the 115 and so why not have 25hp more out of the same motor right? The way I see it, 115 pre 1983 is probably my better choice as it'll be roughly 90 or so hp at the prop, thats almost 30 more hp ontop of what I now have, and considering the weight differences and a high pitch stainless prop, this should get me into the mid 50s? Also, the 115 after 1983 would mean I'd have almost 50hp MORE at the prop, if I'm already doing 40mph just imagine how fast this would be, too fast don't you think? I don't wanna fly I just wanna be a bit faster then where I am and fuel efficient as well, but I guess the fuel efficiency went out the window with wanting a 115 tower of power hahah
My boat is fairly light for a 16' fiberglass, it's probably a bit over 200 lbs dry. I'm 200 lbs, my buddy is 150 lbs, plus a 15 gallon tank full and 2 small bluetop batteries and some light gear.. Probably around 1000lbs including the weight of the motor! Average load is usually with a buddy, so let's say 1100 lbs wet! What is my best choice for getting into the mid 50s? Give me some insight on this you merc gods!