LAND AND SEA DYNO

[Jesse Bodwell]

hi everyone,
does anyone us a land and sea water dyno, were having some problems setting ours up. Thanks,
Jesse
bodwell@cisunix.unh.edu

[Jesse Bodwell]

hi everyone,
does anyone us a land and sea water dyno, were having some problems setting ours up. Thanks,
Jesse
bodwell@cisunix.unh.edu

[B Lewis @ PE Engine Management]

What kind of problems? We have setup and used Land and Sea Dynos.

[Matt W]

Carnegie Mellon does, we just built a good working setup this year. I'll post some pictures of our setup later today. But if you having problems with the hardware or software try calling land and sea first. Their tech support is really spot on for solving most problems.

[Trans Am]

The Universitry of Wisconsin - Madison has been using a Land and Sea 9" Snowmobile Water Brake with the auto load servo for the past 3 years. I imagine we can help you out if you have a question about the setup. Either post a reply or PM me. Otherwise Land and Sea has great tech support and can answer all your questions.

-Trans Am.

[tnel17]

Hi,

I was wonding if I could pick your brain a little bit our Land and Sea dyno.

I'm trying to set up a 9" Land and Sea dyno similar to yours to dyno our Aprilia RX 550 engine.

We are having two main problems. First of all, when the dyno is at full load, it cannot hold the engine at a given RPM. Our engine has a primary gear reduction of 1: 2.583 and when in 5th gear the secondary reduction is 1: 1.047 for a total of 1:2.704. The chart in the back of the dyno manual that graphs max absorber vs. absorber rpm, seems to show that our engine should be below the maximum (it should a maximum of 70 horsepower).

We checked the water flow and we have about 6gpm at 15psi, but our static pressure (with no water flow) is close to 90psi.

The second problem we are having is that the auto-load servo isn't operating properly. I am inclined to think that it is hooked up improperly because I'm told that it should open and close on start-up and it does not. It is getting +12V on the black wire. Also, when I pulled the control cable and attempted to open/close the servo using the software I do get a signal from one of the pins.

Any help that you can offer would be greatly appreciated.

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Trans Am:
The Universitry of Wisconsin - Madison has been using a Land and Sea 9" Snowmobile Water Brake with the auto load servo for the past 3 years. I imagine we can help you out if you have a question about the setup. Either post a reply or PM me. Otherwise Land and Sea has great tech support and can answer all your questions.

-Trans Am. </div></BLOCKQUOTE>

[Mbirt]

The given RPM that you can't hold the engine at--is this with the software control (needle on the screen tachometer) or manually with the load knob on the auto-load servo? If the auto-load servo isn't operating properly, of course it won't be able to hold the engine at a given RPM with the software control. Sounds to me like your problems are one in the same.

Do the torque and rpm displays read as you would expect when you load it down manually with the knob on the servo?

[Seeger]

I can't remember the exact link but there is a chart of the torque the water brake can resist vs. rpm somewhere on there web site, i will see if i can dig that up. We run, an sxv 550 as well and we had to create a 2x speed increaser between the transmission ouput shaft and the 9 in land and sea waterbrake. For us the (1:1 ratio from the transmission ) water brake cannot hold the engine below 4,500 rpm. I sent an email to land and sea and they responded with a link to the above graph and then we made a fix from there and we don't have any problems with it now.

[Seeger]

www land-and-sea com /snowmobile-dyno/DYNOmite%20Snow%20075-150-1K%20Quick-Specs.pdf

there are no units for torque but considering you know the units of hp and you have rpm you should be able to figure it out