Testing under load

[Bigplumbs]

​

I have an issue with my new to me Yamaha 75 hp 2 stroke and after I have worked on things it needs to be tested under load. I can obviously tow the boat to the nearest water which is a significant faff. I don’t think you could get a tank big enough to test a 75 hp at high rpm under load. Is there another way to do this

 

[jakew009]

You can get test wheel propellers which are a bit like a food blender blade. They are designed to simulate the load on an engine in a test tank without making a huge mess. You could make something similar by cutting down an old propeller.

But it’s probably easier for you just to take it to the nearest slipway.

 

[Binnacle]

Any big outboard supplier I've been into has a tank, and a crane system for testing rebuilt o/bs.

Hand your Yam over to a professional; they know what to do and how to do in half the time, and almost certainly in a lot safer fashion than you tying up a RIB to a pontoon and going WOT.


Thses people are in your neck of the woods and seem to be approved by the forum.

75-90hp 2 stroke?

 

[James jameson]

even if you get a tank large enough you will not get full revs as you’ll have a static load, the only way to find your problem and get full revs under load is on a free to run boat

 

[SC35]

even if you get a tank large enough you will not get full revs as you’ll have a static load, the only way to find your problem and get full revs under load is on a free to run boat

It's true you won't get full revs in a tank, but it's a good simulation of "trying to plane" and will flesh out a lot of problems without actually doing a sea trial.