Lower Unit Question! Can u use a 115hp in a 65hp Thunderbolt 1970

[y2jericho]

My wrench put a 115hp lower unit on my 65hp thunderbolt saying it would be fine just the ratio is different and he put on a different brass prop on it because he bent the last one anyway because i was replacing the LU coz skeg was ripped off and when he took LU off he hit the prop and bent but anyway it was screwed.. <br /><br />Is it alrite to put a 115hp LU on a 65HP from the same era... They were both 1970 Thunderbolt Engines<br /><br />Thanks guys

 

[y2jericho]

Re: Lower Unit Question! Can u use a 115hp in a 65hp Thunderbolt 1970

He said the ratios are quite different but he said the prop he put on will compensate for it and i won't notice anything and it will probably be better even?<br /><br />Is my wrench talking out of his ass to make a few $$$

 

[sos]

Re: Lower Unit Question! Can u use a 115hp in a 65hp Thunderbolt 1970

The 1970 1150 Merc had to the 1.78:1 ratio gearcase and the 650 a 2:1 gearcase.<br />A 1.78:1 gearcase is capable of higher top end speeds.

 

[y2jericho]

Re: Lower Unit Question! Can u use a 115hp in a 65hp Thunderbolt 1970

Hmm must be good then