Hey guys my name's Phillip. I follow the forum but new to post questions. Here's my issue. I have a great 1985 60hp Johnson 2 cylinder. Sadly it's just not enough for my 16' flats boat. It takes way to long to jump up and plane unless I'm solo. Im sitting right around 67% of my boats 90hp max rating. Though it will get me to around 27mph w 2 200lb guys on board once I'm there I feel I'm not optimizing my performance. I have a little line of questions regarding these 80s motors that will guide me toward my ultimate goal of repowering.
1) I noticed a while back that the 60hp came in both 2 cylinder and 3 cylinder models. As w a car I would typically think more cylinders would equate to more torque. But I also realize that bore size could change w more pistons. So question one is: Would there be a noticeable difference between 2 60hp motors both w 2.42 gear foot running the same pitch prop..one w 2 cylinders and the other w 3 cylinders? And what differences if any?
2) I've been hunting down 70hp and 75hp Johnson/Evinrude motors for my repower. I noticed production stopped in 1988 on the 75hp models. I also noticed that the 75hp models weighed in at 40lb-50lb less then the 70hp models putting it around the same weight as a 50hp or 60hp. Can someone please explain why this is? In my mind I start thinking power to weight ratio is for the better but then I wonder does the 70hp have a different gear case making it heavier?
I think that's a good start to a good discussion. Feedback is being sought. Thank you!
1) I noticed a while back that the 60hp came in both 2 cylinder and 3 cylinder models. As w a car I would typically think more cylinders would equate to more torque. But I also realize that bore size could change w more pistons. So question one is: Would there be a noticeable difference between 2 60hp motors both w 2.42 gear foot running the same pitch prop..one w 2 cylinders and the other w 3 cylinders? And what differences if any?
2) I've been hunting down 70hp and 75hp Johnson/Evinrude motors for my repower. I noticed production stopped in 1988 on the 75hp models. I also noticed that the 75hp models weighed in at 40lb-50lb less then the 70hp models putting it around the same weight as a 50hp or 60hp. Can someone please explain why this is? In my mind I start thinking power to weight ratio is for the better but then I wonder does the 70hp have a different gear case making it heavier?
I think that's a good start to a good discussion. Feedback is being sought. Thank you!
