think about change from mecrury to a johnson

[josh_2562]

well right now i have a 92 mercury 100hp on my 17 foot flats boat. i was told the engine is about 320lbs. with this engne the boat does about 40 wot. my ? is i have a 1992 70hp johnson that i was told is about 250lbs. do you guys think that the 70hp would push the boat good.if so about how fast will it still go.one of the reason i want to change it is that i put on a jack plate and when i left the engine all the way up it hit my poleing plat form. also becuse of the wight.thanks for any help

 

[tashasdaddy]

Re: think about change from mecrury to a johnson

you may lose 5 mhp. but instead of burning 10 gallons and hour you will burn 7 ghp. proper propping and engine height to get the best performance. you can turn 5500 wot.

 

[josh_2562]

Re: think about change from mecrury to a johnson

what is a safe cruise rpm for both of these motors

 

[tashasdaddy]

Re: think about change from mecrury to a johnson

they both can run all day at 5500. they reach there optimum around 5000.