Because of the higher gear ratio, you'll have to run the engine faster to get the same boat speed as you do with your present transmission - theoretically about twenty-two percent faster (2.61 divided by 2.14 times 100%). You'll be using significantly more fuel, and you also may not be able to reach maximum boat speed without exceeding maximum rated engine speed.
Alan Bergen 35 Mk III Thirsty Rose City YC Portland, OR On Wed, Jan 1, 2020 at 1:44 PM Olivier Chatot via CnC-List < cnc-list@cnc-list.com> wrote: > Hi all, > > I have an interesting situation with my transmission. I would like to > share it with you and get some opinions. > > I have a Yanmar 3HM35F engine with a Kanzaki KBW10 transmission. I need to > replace this transmission because it's been malfunctioning. > > Someone near me has a new Kanzaki KM3P for sale. I believe the mounting > flange is the same shape and size, so physically mounting this transmision > would be possible. > > However, this transmission has a different gear ratio than my old > transmission. My old transmission has a gear ratio of 2.14 (2.50 in > reverse) and the new transmission has a gear ratio of 2.61 (3.16 in > reverse). Since the gear ratio of the new transmission is higher, the prop > would turn more slowly. But I believe it would be safe. > > Do you agree that it would be safe to use a transmission with a higher > gear ratio? Or, do you see something important I'm missing? > > Other specs of the two transmissions are identical. Notably, the rotation > direction of the two transmissions are the same. > > Any comment is greatly appreciated. > > Olivier Chatot > C&C 38-3 > > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- > https://urldefense.proofpoint.com/v2/url?u=https-3A__www.paypal.me_stumurray&d=DwICAg&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=9w3G7Cf8YfQnrjmtuNxwDJYr3JMv9f1pAfgAJ9xXYQQ&m=AC2dODSM47hr4vAzmXP9EkP0VLDkXXrBUDfAjpE30AM&s=eeheZjpDsiFMg3A5qlYm38IsqCdXYT5Lo5ksBQ-tLJ8&e= > >
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