How about a two speed ZF tranny?

[DoOver]

I remember quite a few years ago that a 2 speed ZF tranny was the way to go. Low for trolling and hole shots and High for cruising. Are they still available? Are they feasible in a Shamrock?
Brian

[Mistress]

Only 1 I found:

http://zf-marine.com/Transmissions/index.cfm?GN=ZF_90_TS&PID=0&DS=Description

pretty big..and I suspect big $$$'s too.


I haven't found a Shammy config that could handle the offset stock. I'd think a trolling valve would be a better option.

[DoOver]

It still shows a trolling valve for the low speed gear. Kind of defeats the purpose. That angle would get the engine's oil pan out of the bilge water.Might make a bigger hump in the cockpit though.
Brian

[SCOOTER]

http://zf-marine.com/Images/Gears/ZF90ATS.gif


ZF 90 ATS


8° Down angle, direct mount marine transmission.

Maximum rated input: 322kW (431hp)

Available for Pleasure and Light Duty applications.



Reverse reduction TWO SPEED transmission equipped with electric shift from first to second speed. .
Suitable for high performance applications in luxury motoryachts, sport fishers, express cruisers and light duty applications. .
Fully works tested, reliable and simple to install .
Design, manufacture and quality control standards comply with ISO 9001 .
Compatible with all types of engines and propulsion systems, including waterjets and surface- piercing propellers, as applicable .



Lightweight and robust aluminum alloy casing (sea water resistant) .
Case hardened and precisely ground gear teeth for long life and smooth running .
Planetary step-up gear on power input side .
Output shaft thrust bearing designed to take maximum propeller thrust astern and ahead .
B/W connection integrated with casing .
Smooth and reliable hydraulic shifting with control lever for attachment of push-pull cable .
Suitable for twin engine installations (same torque capacity in ahead or astern mode. Reduction Ratios in ahead or astern are very close.) .
Replaceable oil filter cartridge .
Compact, space saving design due to 8° down-angle and beveloid gear principle .
"SUPERSHIFT" clutch control .



Engine-matched dual stage coupling .
SAE 3 and SAE 4 bell housings .
Oil cooler complete with fittings and flexible oil hoses .
Mounting brackets .
Propeller shaft flange .
Control cable bracket for mounting of push-pull cable to the control lever .
Classification by all major Classification Societies on request .
SAE «A» Power Take Off .
Electronic Safety Device for the downshifting inhibition at high engine speed (recommended) .
Thermostatic valve for better performance of trolling valve in cold sea water .
Trolling valve (mechanical) for slow-speed drive .
Electric Trolling .
Supershift (with Autotroll and Easidock) .
__________________________________

It's about 5.5" longer & has less than .5" more depth (input/output shaft centerline) than a ZF 63 A.

[DoOver]

I bet that would be just the ticket behind that new Yanmar/BMW. Or a 300 HP Cummins. You would run out of hull before the engine tops out.
Brian

[skipm]

You know overdrive transmissions in cars had a 30 % reduction & I think it is called a planetary gearbox attached to the back of the trans.I don't see why BW couldn't do this.Here is what it looked like it was not offset so the trans didn't have bulge off to the side.
http://science.howstuffworks.com/gear7.htm

[SCOOTER]

You know overdrive transmissions in cars had a 30 % reduction & I think it is called a planetary gearbox attached to the back of the trans.I don't see why BW couldn't do this.Here is what it looked like it was not offset so the trans didn't have bulge off to the side.
http://science.howstuffworks.com/gear7.htm


#20 is the Sun Gear

#8 is the Planetary Gearset


http://www.marysvillemarine.com/velvetpb/images/page45.gif

[DoOver]

Who deals in ZF in the Northeast? Mack Boring? I would like to get a ball park price and a dealers opinion on the feasiblity of this tranny in a Shamrock. It seems to me, this would be 'Mahonie' for trolling and docking. How much is an add on trolling valve? The tranny needs to be removed to install a trolling valve? When you take out the tranny, it would be a good time to rebuild/upgrade the tranny anyway? Maybe in the long run this two speed, if it works as advertised, would be the cat's far side?
Of course this is all still dreamin on my part, as I'm outside, lookin in.
Brian

[Pedlyr]

ZF Marine
Warwick, RI
401.463.3005

John Shea does gas engines but I am not sure on diesel. Try Jay Torry

HQ is in Ft Lauderdale
954.581.4040

They are VERY hard to get a hold of. But they are good guys and should help.

[skipm]

#20 is the Sun Gear

#8 is the Planetary Gearset


http://www.marysvillemarine.com/velvetpb/images/page45.gif
Is that a two speed trans?

[DoOver]

I got a hold of Gil in R.I. at ZF. He said that the ZF two speed transmission is more like an over drive. Meaning it has a 'first' gear that is like the normal ratio and 'second' gear that is an 'overdrive' or higher gear ratio or lower ratio number.He said they put them in high powered Cabo's and the like. He said a trolling valve is the only way.
Brian

[Mistress]

No...that's an exploded view of the gear reduction section of a Vlevet Drive (71 or 72). No switching in/out of the gear reduction.

[Pedlyr]

DoOver-

Gil Bashaw was in the field for some time before becoming the Service Manager. I have actually worked with him on larger commercial gearboxes. He knows his stuff as far as I am concerned. You could probably follow up with Dave Santos in Lauderdale if need be.//Ed

[DoOver]

I think I'm going to call Fla. Why couldn't they make a two speed with a lower first and a 1to1 top?
Brian

[skipm]

How about a lock up convertor, it would have to be in the original design. I think they only reduce rpm's 10 to 15 %.

[DoOver]

I've made several calls to several different poeple, no replys. Gil in R.I. said he wished ZF didn't made a two speed tranny. Oh well, It sounded good on paper.
Brian.