gear ratio 1974 50 hp

[reeldutch]

i am looking for the gear ratio numbers for a 1974 50 hp evinrude mechanical gearcase.<br />it is a large gearcase.<br /> thanks

 

[Paul Moir]

Re: gear ratio 1974 50 hp

12:32 on the 50hp there reeldutch. That's a big-un all right!

 

[reeldutch]

Re: gear ratio 1974 50 hp

i have this motor running on a 17' winner from 1971 and by myself i get the rpms up to 5600 rpms or more depents on the chop.<br />if i put one more person in the boat plus a cooler with beverages the rpms drop to about 5000.<br />the prop is a 13 3/4 X 15 and im thinking of changing it to a 14 X 13.<br /><br />any suggestions?<br /><br />i dont want to burn the pistons or ruin this gearcase.<br /><br />thanks

 

[Dhadley]

Re: gear ratio 1974 50 hp

That motor really needs to be in the 6000 range with your average load to live and perform correctly.

 

[reeldutch]

Re: gear ratio 1974 50 hp

i know this boat is pushing the limmit with this engine.<br />but is there any chanse a 14 X 13 will do it or should i just forget about it before i turn it in to a barge????<br /><br />thanks reeldutch

 

[reeldutch]

Re: gear ratio 1974 50 hp

i will try this.<br /> i found a cheap prop so we will see what happens.<br />if it will turn 5500 with 2 people in tyhe boat and 6000 by myself i will be happy.<br /><br />thanks

 

[Paul Moir]

Re: gear ratio 1974 50 hp

Did you try raising the engine up higher out of the water? Better way for getting revs as I've learned. <br /><br />Do you have any speed information? GPS/Speedo?

 

[reeldutch]

Re: gear ratio 1974 50 hp

the antiventilationplate is about 1 " above the bottem of the hull.<br />the speed is hard to say but i guess its between 25 and 30 mph.<br />but this is a wild gues.<br />i think if i change it to a 14X13 instead of the 13 3/4X15 i hope i will gain about 400 rpms that will bring the engine to 6000 and with more load to hophely 5500.<br />i think if thats what happens i will be happy.<br /><br />i will let you know what happens.<br />i know this boat is heavy for this moter.<br />may be its asking to much.<br /><br />i dont realy see 17 footers unless its a skiff with a 50 horse.<br /> http://groups.msn.com/outboardpictures/shoebox.msnw?action=ShowPhoto&PhotoID=17 <br /><br />reeldutch