v-rude/konnie gears??

[form-e one]

just wondering if konnie gears say 12/15 ratio or??? would stand up to the v-rude and some big props????

[bill van steenwyk]

Would seem so

Konny and other 500/700 PRO Motors: 180/200Plus HP @12/13K RPM, 2 firing impulses per revolution of either 250 or 350 CC's. (two cyls fire together)

V-RUDE 60CI: HP??, three 350CC cyls firing impulses each revolution. It was always my understanding that the closer to 1 to 1 you were the harder on the gears because they were meshing the same teeth more often, rather than spreading it out over more teeth during the life of the gears. If true it would seem the 12/15 would be better to spread the wear out, and might be as fast if you could prop it right. Little more forgiving if you aren't right on with the props also.

Talk to some of the guys that run them under the 500/700 PRO motors like Litzell, Hall, Thrilby, etc. Litzel and Hall sell them also.

[m58rr50hydro]

Konny and other 500/700 PRO Motors: 180/200Plus HP @12/13K RPM, 2 firing impulses per revolution of either 250 or 350 CC's. (two cyls fire together)

V-RUDE 60CI: HP??, three 350CC cyls firing impulses each revolution. It was always my understanding that the closer to 1 to 1 you were the harder on the gears because they were meshing the same teeth more often, rather than spreading it out over more teeth during the life of the gears. If true it would seem the 12/15 would be better to spread the wear out, and might be as fast if you could prop it right. Little more forgiving if you aren't right on with the props also.

Talk to some of the guys that run them under the 500/700 PRO motors like Litzell, Hall, Thrilby, etc. Litzel and Hall sell them also.

Now Bill:
tell how that works?

[bill van steenwyk]

what happened??

Looks like your cat knocked it off the bench. Also looks like one Rex Hall had back in the late 60's. If you know him well ask him about it and what happened when he was trying to put it back together. On second thought he might have put it out of his mind. I seem to remember reading something just the other day, maybe on BRF, that a 3 cyl OMC has a downthrust on the crank while running?? If so maybe this translates to thrust on the pinion and prop shaft gears, an shortens the life?

Some years ago Stan Leavendusky Sr. I believe, knew someone that made gears. He was thinking about casting some lower unit housings and building lower units. He contacted the person and told him the size the gears needed to be and the HP and RPM they would operate at. The guy just laughed and told him he was dreaming if he thought gears the size they would need to be to fit in a lower unit would ever last under that kind of HP and RPM. This was back when engines only developed half the HP they do now and only turned 9/10K tops. Looks like the problem has not gone away.

[David Weaver]

I Made One of Those

Now Bill:
tell how that works?

"We" chopped to create a special 12:16 Konig unit. The 250 really ran well. Lower unit lasted 3 heats. Cause for failure was ours!! Lesson was learned.

Konig units are worn out. Some early Konny units had casting issues.

I believe that Bill's premise is correct reagrding the gears. One can also purchase Konny, Rossi and VRP 12:15's and 14:15"s. Perhaps others.

[mercguy]

Now Bill:
tell how that works?

**** river racers and their Mercs..........

[Rex Hall]

lower units

Looks like your cat knocked it off the bench. Also looks like one Rex Hall had back in the late 60's. If you know him well ask him about it and what happened when he was trying to put it back together. On second thought he might have put it out of his mind. I seem to remember reading something just the other day, maybe on BRF, that a 3 cyl OMC has a downthrust on the crank while running?? If so maybe this translates to thrust on the pinion and prop shaft gears, an shortens the life?

Some years ago Stan Leavendusky Sr. I believe, knew someone that made gears. He was thinking about casting some lower unit housings and building lower units. He contacted the person and told him the size the gears needed to be and the HP and RPM they would operate at. The guy just laughed and told him he was dreaming if he thought gears the size they would need to be to fit in a lower unit would ever last under that kind of HP and RPM. This was back when engines only developed half the HP they do now and only turned 9/10K tops. Looks like the problem has not gone away.

Bill, I think that unit looks good compared to the one I had. Rex Hall

[garland powell]

units

The Konni unit will not hold up under a 3cyl. we have tryed. The 14/15 lasted the longest 4 heats intell the prop shaft gear split and put a big hole out the bottom.We have blown 6 units in two years. I use a bass now.

[m58rr50hydro]

**** river racers and their Mercs..........

NOPE DAREN:
MOSES LAKE
22CI 2 CYL, IF IT WAS OFF THE M-58 BOAT, THE ONLY THING THAT COULD BE LEFT IS A BLOODY STUB

[Joe J]

Mark:

If that is a small Konig case, I could have told you what would happen, as I have a few myself......


Joe

NOPE DAREN:
MOSES LAKE
22CI 2 CYL, IF IT WAS OFF THE M-58 BOAT, THE ONLY THING THAT COULD BE LEFT IS A BLOODY STUB

[bh/]

The Konni unit will not hold up under a 3cyl. we have tryed. The 14/15 lasted the longest 4 heats intell the prop shaft gear split and put a big hole out the bottom.We have blown 6 units in two years. I use a bass now.

After two or three blown units one wonders why you would return. You are a bear for punishment
I am curious as to the length of your drive shaft,
and are you using a 'torsion' shaft , as Bass recommends. Were these cases also modified from the UIM pattern to the larger gear lube volume, so as to keep temps down?
I have not run as much as you have, but have had no trouble with my 14:15,.... "yet".
The 14:15 is the strongest configuration.
I never did try my 1:1s

[jeff55v]

The Konni unit will not hold up under a 3cyl. we have tryed. The 14/15 lasted the longest 4 heats intell the prop shaft gear split and put a big hole out the bottom.We have blown 6 units in two years. I use a bass now.

Garland, Have you had any problems with the Bass unit yet? How many heats do you have on it?

[mercguy]

BASS all the way!!!

Garland, Have you had any problems with the Bass unit yet? How many heats do you have on it?

under the Tohatsu mine has performed FLAWLESSLY for 2yrs straight!! Change the gear oil after each racing weekend and keeps on rollin!

BUT..................**** thing DOES NOT like being ran with the prop shaft 1/2" below the bottom of the boat..........at about 75MPH, it starts lifting the tail of the boat and makes it VERY hard to drive! Jacked her up to 1/4 (in MOD) and is WAY better and more controllable to drive!!!!!!!!

so.......for all those people saying running the BASS unit deep presents no problems on a hydro...............I say BULL****!!!!!

[sam]

Could it be the prop?

[mercguy]

Could it be the prop?

been through close to a dozen props.......will make it work though.......just gotta keep changin stuff!