Lower unit fun

[JohnsonM50]

hey np jeff every one has there own opinion thats wat these forums are for if ur a na say hey ill live with it lol

geez lol i know too many people lol johnsonm50 was the one lol srrys

hmm parts.. u wouldn't have say a forward gear would you that would fit an 18 ... if u did maybee u could stuff it in with the tower

Yup that was me, If you look into my posts here on BRF youll probly find that I wrote about the nearly identical next size up OMC lower. Conclusion... alot of improvement is possible but at that gear ratio in relation to props available,,, youll need a foot. With an AB 1 to 1 under an OMC 18 Ive seen a C or D hydro with a lite driver do upper 40s. No matter what you do to the OMC foot an 18 wont do that.

[JohnsonM50]

here are the gears in the lower
Attachment 16521
heres the two gears
(left gear is the forward gear and the right gear is reverse)
Attachment 16522
heres a pic of my shop in my garge(put it up just for fun )
Attachment 16523

When this is in reverse the propshaft is pushing forward and the gearlash is trying to spread the gears pushing the R gear against the bearing head [$115 new]. The location of the bearing head is indexed with a small pin. Granted these gears are TUFF its the surrounding parts. Notice the engieering of forward gear thrust management. If you go the reverse.. post your results here for posterity lol

[jeff55vDSH]

Here ya go Christian. This is what you need. Happy bidding!

http://cgi.ebay.com/ebaymotors/ws/eB...m=160165200176

I hope ya win it! It would be great to read about you fabricating this onto some kind of fun/racin' motor!

[goldenshinner]

im currious also if you get this to work. as i am also interested in trying such a modification. what about simply using the left hand rotation prop and engaging the reverse instead of forward? with all the original gears and bushings untouched the power transfer should be the same roughly.

[JohnsonM50]

im currious also if you get this to work. as i am also interested in trying such a modification. what about simply using the left hand rotation prop and engaging the reverse instead of forward? with all the original gears and bushings untouched the power transfer should be the same roughly.

This exact idea has been tossed around on several boards inc. here, it would work for awhile but if you look at the lower unit youll see that the F gear is far more beefed up than the R gear. Look for postsabout it and please post results if you do it.

[Skoontz]

On a simliar topic, there is a guy down south who makes mud motors he calls 4x4 outboards. They all run air cooled engines, (Honda, Briggs, Kohler, Kashwacki) and use a long stick extending into the water from the transom. Prices start at $1,800 to $3,000 but if you look at the pics, you may bea able to take a junk yard lawn mower bock and concoct something alot cheaper and more effectively than what you are attempting here.....