wisconsin V4Hd and V465D

MF 711 skid steer
I am replacing a V4Hd 24 HP with a V465D 65Hp engine
Is there anyway to decrease the horse power of the 65 HP down to 30 HP and still keep my RPM at 2000
One thought is to disconect 0ne or two spark wires
would this damage the engine??
Thanks Don
 
Not a good idea.

If you must replace the current engine with the higher HP engine, set the governor at the proper RPM for the application and limit how you use the machine.

Dean
 
Why decrease the power of the larger engine. I ask because a buddy of mine had an older New Holland machine that had the smaller V4 in it, but discovered that the V465 was an optional engine if the machine came with high flow hydraulics.

That being said, the hydraulic/hydrostatic systems currently on the machine aren't going to care about the extra HP as they can't do any more work than the relief valve settings allow them to do. So, even if you've got a 65 HP engine the machine will still only require 30 HP to run properly so the only thing that will happen is the new engine won't be working quite as hard all the time.

Now, if you tried slowing the engine down, etc to get the larger engine to the lower HP rating, it's a whole different story. The GPM of flow put out by the pumps is determined by the speed of rotation. As a result slowing the engine down to a lower RPM (to get the lower HP rating) is going to slow the pumps rotational speed down. In turn this is going to lower the flow from the pumps and that is something you, and the machine, will definitely notice.

Ultimately why not just put in the larger engine and check into a larger hydraulic pump for the aux hydraulic system. If it didn't have one, don't worry, just save up and get the pieces required to install one at a later date. With all the attachments on the market right now needing the higher flows, and the amount of work you can get out of them, why waste a good thing when you've got it?
 
A quick, easy way to limit horsepower is to fabricate limit stop at the carburetor throttle shaft, or the governor to carb link. Arrange it so it limits the carb throttle plate maximum opening to something like 30 deg ("wide open" being 90 deg).

The engine will still achieve full governed RPM and respond normally under partial load. However when heavily loaded and the governor commands power beyond what the stop is set for, the engine will simply slow down, same as if it was a lower horsepower engine.

The trick is to find right stop setting for "wide open". Will require some trial and error and perhaps vacuum gage temporarily plumbed into the manifold to give a rough indication of power output (lower vacuum numbers = higher horsepower)
 

As previously stated.Install as is and don't mess with trying to limit power.

A restrictor plate will limit high rpm HP but will make little difference to peak torque at mid rpms.
 
(quoted from post at 19:41:41 07/09/14)
As previously stated.Install as is and don't mess with trying to limit power.

A restrictor plate will limit high rpm HP but will make little difference to peak torque at mid rpms.

I really wasn't serious about the restricter plate.

Since the engine already has a governor it would not change the maximum rpms like it can in a race car. It would limit hp due to restricted maximum air flow through the carburetor.
 

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