Torque vs HP on Perkins 103-10

[Allen Dick]

I am trying to decide if I need to adjust my maxi-prop.

With the previous 2.53:1 transmission, I had to run at RPM to get 6 knots  and the engine bled an ounce or so of oil on short trips but never enough to require topping up between changes.

This replacement tranny is as far as I can tell ~1.2:1 and I can get the engine up to a true 2760 to 2800 RPM.  More throttle does nothing but the boat makes 6 knots plus with a clean hull.

After this change I was surprised not to see any oil under the engine after three or four hours running.

So, should I adjust the prop or just be thankful that it is working so well?

I had understood that it is proper to adjust the prop so it just allows the engine to reach the max RPMs but what is that number for a 103-10?  I looked everywhere for torque and fuel consumption curves with no luck.

I'm happy now, but is my engine happy?

[chris evans]

Perkins M30 is 3600 rpm however  diesels should only be taken to 80 % of max 2880 rpm

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[Jon Schultz]

What make/model transmission? Perkins? 

Do you have the max prop manual? 

Jon 

Sent from my iPhone

On Aug 25, 2022, at 7:03 PM, Allen Dick <alle...@gmail.com> wrote:



[allendick]

It is  a Hurth HBW100, I assume.  The label is missing.  And yes, I have read   and understand the engine, transmission, and the prop manuals. 

My question is what is the optimal full throttle RPM and cruising RPM for the Perkins 103-10.  I cannot find that anywhere.

[mechone]

I told you 2800 rpm ,my 351 does 7knots with a kiwi prop and clean bottom . 103-10 is the Perkins M30 and is also the Volvo MD 2030 , Perkins built them for Volvo