Single Engine Twin Drive
 

Geared Up System
Anybody know anything about there product?

I was thinking about buy a 36' cigarette with some burnt out engines and replacing them with a single 480hp Yanmar diesel with twin bravo ones. Splitting the torque, so it should have no problems for the bravos. Seems like a simple inexpensive and fuel efficient system. I know the 480 is much more efficient than twin 315's. And I haven't heard great things about he bmax diesel drives.

I remember reading somewhere about a chain drive system in some of the typhoon boats. Anyone know who was making that?

Is there anything bad about having twin drives connected to a single engine?

Mastry Engine Center in St. Petersburg, FL has the setup you're looking for and is a Yanmar distributorship, 727-521-4661

There was an article in Powerboat a while back about a twin drive single engine setup. Lots of power loss, lots of drag. I think I would rather have it the other way around, two engines and one very beefy drive. For a diesel not real speed demon it may be good to split the power.

IMCO made a gearbox for a two drive/one engine setup a few years ago. It was a sharp looking piece. The only problem I see is that the boat will be a slug with one 480. I would think it would work good if you put more power in it.
There are quite a few monetary benefits to a single engine, however, if you have a problem, you are coming in on the end of a rope. It sure is nice to have that backup engine.
Eddie

There was a 35 Nordic with something like a single 1200hp and the Imco splitter. I think the re were problems with the gear box.

480hp in a 36 Cig???? You'd be lucky to hit 50mph.

Wouldn't it simply be better to mate the 480 to a SSM V drive. Costs less, and fewer parts to break. A used SSMV, is quite reasonable.




Darrell.

Waaaaayyy underpowered.

Probably be a heck of a lot cheaper and easier to just throw a couple stock big blocks in it. You will never be able to resell it with a single.

and still won't do 50 mph. Maybe a seatec diesel and a single #5 or an Arny.

I agree, going to be a trawler version of a perf boat, use 2 if you do it...

Still Thinking
 

Only Problem with the SSM V is that it is only rated for 750 ft/lb of torque. 480 Yanmar is putting out 950 to 1000. That is the only reason I would consider splitting it. The only units that I have heard of that can support that kind of torque are the bmax and Merc NXT. The Bmax I have not heard good things and the NXT is rather pricey.

I would like to be able to hit 60. But I might be able to live with 50. with the yanmar only burning 20 gph thats a lot more driving for the $$$. Maybe 2 x 480, 4 x B1's :)

I thought I read in the last issue that the geared up system caused a 4% loss. I looked online but I can't find the article. And my copy is at work. I'll look tomorrow.

Thanks For Everyone's Input!!!

The gear box splitter and rigging is probably going to cost you more than if you just went with wet sump SSM6. You can find them for around 15k. No Bravo style drive will hold up very long to 1000lbs of torque., especially in a heavy 10,000lb single engine boat.
If you do what you talking about, plan on keeping the boat forever. You will never be able to sell it. Put a couple of stock engines in it and call it good.

Torque
 

The geared up system splits the torque so each bravo would only be seeing under 500 lbs of torque. That should work?

The IMCO 35' Nordic is on Lake Perry in Kansas & participated in the Shootout @ LOTO in 2009. I think it has a Procharged 572 in it right now & it ran in the low 80's at the Shootout.

the IMCO boat is now owned by shawn mercer out of lawence. the motor is a 565 with an M-3. i rode on it when brent had it, on high boost we were rolling 95 on gps at a little over half thottle.
they've lowed the boost and the boat ran 94 at the end of the summer still playing with the tune. 3 years ago when brad had it, the boat ran 108 with a quad rotor motor in it.

the splitter box hasn't had problems, it was made by a company that builds couplers for multi engine pulling tractors. it's bullet proof to say the least, it's a gear driven deal.

The only problem with the splitter is IF you do get the boat in the air and it leaves or re enters the water with only one drive making contact with the water ALL of the torque for that instant will be going to the only drive that is in the water. BANG

the only time he will be leaving the water in a 36 cig with 480hp is when he puts it on the trailer!! I had a 35 mistress with 1200hp & it was no small task to get the drives out of the water!!

But if he does - you can kiss the drive gone.
Even if one drive aireates getting on plane it will put all of the torque on the other drive.
And 480 HP from a diesel engine isn't the same as 480 HP from a natural asperated gas engine.

I would like to be able to hit 60. But I might be able to live with 50. with the yanmar only burning 20 gph thats a lot more driving for the $$$. Maybe 2 x 480, 4 x B1's :)


Thanks For Everyone's Input!!![/QUOTE]


I don t know what the gearbox costs but it ain,t gonna be cheap and think they are any used ones to find ,just buy one or two 480,s and give rik from arneson a call an he hook u up whit a pair inline asd 8,s and you have a bullet proof setup for the same or even less $$$ then gearboxes and bravo 1 drives wich are gonna break and best of all it will still be sale aible!!

I have a 32 hustler whit 2 qsd 320 on xr drives and hit the 65 mph just dailing in but hoping to see 70 one time but it,s fun driving and one hell of a accelaration from 1900 to 3800 !

the cigarette is much heavier You never gonna see 60 I hope you get it on plane on 1 480

I don t know what the gearbox costs but it ain,t gonna be cheap and think they are any used ones to find ,just buy one or two 480,s and give rik from arneson a call an he hook u up whit a pair inline asd 8,s and you have a bullet proof setup for the same or even less $$$ then gearboxes and bravo 1 drives wich are gonna break and best of all it will still be sale aible!!

I have a 32 hustler whit 2 qsd 320 on xr drives and hit the 65 mph just dailing in but hoping to see 70 one time but it,s fun driving and one hell of a accelaration from 1900 to 3800 !

the cigarette is much heavier You never gonna see 60 I hope you get it on plane on 1 480[/QUOTE]


Yanmar 480HP $40,000, Geared up System $5,000, 2xB1's rebuilt $10,000 ---Total $55,000

Yanmar 480HP $40,000, Arneson $26,000, Bow thruster $5,000--- Total $71,000

2x Yanmar 480HP $80,000, 2x Arneson $52,000 --- Total $132,000

... A lot of savings. Obviously 2x Yanmar would be the most ideal setup... but there is a lot to be said for $77,000 savings. I'm not sure I would want to have to maneuver a single with Arneson without a bow thruster. I've heard that can difficult. Plus if a B1 breaks... not too difficult to have a spare and swap off. If by chance you were to mess up an Arneson I have not idea what the turn around would be on repairs.


As for the one unit aerating and the other blowing... I thought the torque was split no matter what, but I can't find anything to support that... I'll call geared up and see what they say.

Where did you get that pricing for an "inline" Arneson ASD8? You are about $10K to much for each one.

As far as breakage, there is very little to worry about there. The Yanmar 480's are no problem for the ASD8's as we package them with this engine and the Cummins QSB480's and they come with a warranty. :)

That was the price I was quoted when I called... but that might have been for the bravo replacement kit. Whats the difference with the "inline" arneson? Does that include tranny, prop, steering, and water intake?

You would not need the "Bravo Conversion Kit" for a Yanmar 480 and the Bravo Conversion Kits do not cost that much either. so..??

The marine gear would come on your engine from Yanmar as you would purchase a bob tail with gear from them. The rest is available from us other than the water pickup.

That thing won't get on plane....

About the pricing Rik answered that ,the bow thrusther you can get off your list because a arneson boat handles better then a bravo boat on the dock wich you can find on many forums . also haven,t heard that they break .

I was also thinking for arnesons but had allready bravo,s on my boat and the hp can be handled by the xr,s
if I ever add hp or get a other diesel project I will go arneson for sure !

If you need any info on anerson you can ask Rik he is very quick answering and helps always even if you buy nothing .

cummins ?
 

I can offer you A pair cummins QSB 5.9 rated 350hp @ 2800 rpm for the price that,s just a little over 1 yanmar 480

pm interested

What would the price breakdown look like... The only reason I say $26 is because that was the price I was quoted, but it might have been a different drive?

ASD8 in line drive unit cost $16,020.00
Twin Disc Transmission $5,000
Surface Piercing Propeller $4,000

Total $25,020... provided you have your own power steering pump.