Lower Units - MOD

[modhydro]

Gear fits

Dave,

From what Steve has told me, the difference is just the attention to detail on the shaft and gear tolerances. The Konny stuff is tighter and simply fits properly where the Yamato is more of a crap shoot. If I can ever get back samples of gears, we will have other ratios available for the large tooth format. I'm hoping to have something available soon as far as replacement gearsets.

Steve Roskowski

[pro350hydro]

Since the Bass unit is built to handle the toughest mod motors and is proven, why not run a Bass unit? Why re-invent the wheel - no pun intended.


Seems like the logical answer as far as price and dependability

[Steve77t]

Thanks Guys,

Trying to get a grasp on what is out there ready to go, off the shelf.

Steve, won't Yamato gears fit the Konny's and vica versa ?

David L6 - Merc units hold up very well under the 3 holer, but good luck finding one ready to go, at a reasonable cost. Funny how stuff that has not been produced for many many years is still in hot demand and nobody wants to change. I have luck with Bass as well, and Yamato. Granted, gears in all but Bass will go about a season maybe two. I have not run the Bass hard for a full season to test.

In Yamato I never have blown gears, but the dam gear slips, and once that happens it is hell gone wild. Even though pinning them prolongs the slippage, it still happens. I think Konny has a shoulder on the shaft for the bearings to rest against so this does not happen. Steve will correct me if I am wrong.

Yes it is possible for gear interchange, The problem with most Mod racers is they are using old stuff that is no longer made. Even the Yamato gears are now made with pinion made to shaft.I have made OS high spot propshafts to fit the gears proper so the slipage thing is no more. I also have machined the high spot for a shoulder to stop this also. This used to be a problem with the VD/ VE Königs and I learned that too high on set up as well as the loose nut behind the steering wheel makes for much unit and cranshaft repair.
Steve

[modFE]

1:1

Manufacturing technology has surpassed gears in a direct drive application.

[David_L6]

If I can ever get back samples of gears, we will have other ratios available for the large tooth format. I'm hoping to have something available soon as far as replacement gearsets.

Steve Roskowski

Steve,

What lower units will the gears fit? How is the complete unit you were working on coming along?

Since the Bass unit is built to handle the toughest mod motors and is proven, why not run a Bass unit? Why re-invent the wheel - no pun intended.


Seems like the logical answer as far as price and dependability

If I were putting together an FE/SE rig right now that is exactly what I'd do as the Bass unit is available with an overdrive gear ratio. I'd try an overdrive unit and see how my 1:1 44 props would work. If they didn't work so what? I'd have to buy new props for any other gear ratio....

I learned that too high on set up

As long as you're getting water it ain't too high, is it?

as well as the loose nut behind the steering wheel

Hey! Some of us resemble that remark.

[mercguy]

small tooth vs. large tooth gears..

Dave,

From what Steve has told me, the difference is just the attention to detail on the shaft and gear tolerances. The Konny stuff is tighter and simply fits properly where the Yamato is more of a crap shoot. If I can ever get back samples of gears, we will have other ratios available for the large tooth format. I'm hoping to have something available soon as far as replacement gearsets.

Steve Roskowski

what is the advantage/disadvantage between the two types? Also, I have been told there are some "handling" problems with the Bass unit, is this true? This thread is very important to me, as I will be puchasing a new DMH unit very soon.

[hshawwpba]

hshawwpba

Bass unit new stlye has 3 ratio's 15 - 16 under, 1-1 and 16 -15 over, you just reverse the gears from shaft to shaft to change ratio. Infact you can use 1 foot housing and change all ratios in same foot as needed.
The new style tower does not have pivot pin on bottom but I have made a 1/4 inch plate that bolts between the foot and tower and put a pocket on it to hold the pivot pin on the bottom end. It works good, if you want to adapt other gear cases to the bass tower.

Hope this helps!

[pro350hydro]

what is the advantage/disadvantage between the two types? Also, I have been told there are some "handling" problems with the Bass unit, is this true? This thread is very important to me, as I will be puchasing a new DMH unit very soon.

Daren, I know several people that run the Bass unit in D mod, and FE. Have never heard one driver complain about handling. One other nice thing about these lower units is they are made in the USA in WA State, and all parts are available and in STOCK. I just bought a set of gears and bearings from Sid Bass last month for my buddy that runs FE Hydro. I had all parts in less than 5 days, including mailing the check time. Try doing that with an old dog worn out lower unit that nowone has parts available for anymore.

[pro350hydro]

I learned that too high on set up as well as the loose nut behind the steering wheel makes for much unit and cranshaft repair.
Steve

So, what ya trying to say Litzell? Has the lower unit and crankshaft repair business been good lately???

BTW, thanks for sending both my crankshafts and lower unit back. Tested last weekend. Everything is good, Motor is VERY STRONG, Rayzor's back in the seat! Turn and Burn!

[pro350hydro]

If I were putting together an FE/SE rig right now that is exactly what I'd do as the Bass unit is available with an overdrive gear ratio. I'd try an overdrive unit and see how my 1:1 44 props would work. If they didn't work so what? I'd have to buy new props for any other gear ratio....

Or Just buy another set of gears and use all your current props. However, I bet with a 1:1 you would be in the hunt/top positions with your current props.

[modhydro]

Replacement Gearsets

David
The gearsets were made to fit in the Konig large housings. They would work in any gearcase that accepts those gears. I should have a new batch for more testing as the first ones fractured and seemed to have hardness too deep. The fit and finish of the sets were excellent, we just need to do some more development before they will be ready.

I haven't had a chance to get much farther on my housing. This normal job stuff sure gets in the way of boatracing! My schedule here at the tunnel is pretty brutal and doens't leave a lot of free time for my other endevours. Once I have reliable gears though, the fire will be lit again and things will move along.

Steve Roskowski

[Dave M]

Ladies and Gents

This thread was not meant to plug any brand of Lower unit as best, nor was it to advertise a lower unit, or make bad on any lower units available.

Bottom line, the more manufactures there are, the better off the WHOLE sport of boat racing will be. If they only made Fords and everyone had to buy a Ford, there would be a lot of people walking.........

I love this thread, I am learning stuff, and I am passing along to my dad as well, thanks both Steve's.

Steve R, are you saying you are making a 1:1 gear set that will fit the Konny and Yamato Hatchet ?

On my Bass unit, I have had handling trouble with my specific setup. However, working with Sid he has helped us to get it handling right with a little epoxy work. Thanks for the excellent customer service Sid. Now I am working on getting the speed I need.

I am anxious to digest this thread, it gives me fresh hope that some love boat racing !

So with that, please let me know if there are any more options, and keep this updated ! Mod and Stock need lower units. We can learn from the Alkies........ did I just say that....

[modhydro]

gearsets

David,

The plan is to have the 1:1 sets for the Konny cases. I believe that these same gears fit the Rossi and VRP. I thought the Yamato was different in configuration, but I may be wrong. Like I said in the earlier post though, I need to have them test out good in 14:15 before I start doing other ratios.

Steve Roskowski

[mercguy]

This thread was not meant to plug any brand of Lower unit as best, nor was it to advertise a lower unit, or make bad on any lower units available.

Bottom line, the more manufactures there are, the better off the WHOLE sport of boat racing will be. If they only made Fords and everyone had to buy a Ford, there would be a lot of people walking.........

I love this thread, I am learning stuff, and I am passing along to my dad as well, thanks both Steve's.

Steve R, are you saying you are making a 1:1 gear set that will fit the Konny and Yamato Hatchet ?

On my Bass unit, I have had handling trouble with my specific setup. However, working with Sid he has helped us to get it handling right with a little epoxy work. Thanks for the excellent customer service Sid. Now I am working on getting the speed I need.

I am anxious to digest this thread, it gives me fresh hope that some love boat racing !

So with that, please let me know if there are any more options, and keep this updated ! Mod and Stock need lower units. We can learn from the Alkies........ did I just say that....

Dave, I think this is a GREAT topic you started and VERY IMFORMATIVE. I asked this question on another web site, with some success, but this one gives me more info, to say the least. So far, from what I can figure for my needs (DMH), the Konny might be the best way to go. Now, what if the preferred gear ratio for a DMH, 1 under?

[Dave M]

DMH Gear Suggestion

Darren,

Most of the big dogs run 14:15 Hatchet Feet. Hauenstein runs the Merc in what I am sure is 14:15 based on the size of the prop they have on it. Witham runs the Merc foot to with 14:15.

With the D I recommend 14:15, seems to be a good match. And the only legal ratios are 1:1 or 14:15 in APBA.

Well, based on all the info here, 1:1 is going to be a LONG time coming for most current readily available off the shelf gear boxes. 1:1 looks like Bass is the answer, is anyone using the Bass 1:1 under a D Mod ? Any reports on performance ?