Re: [Amel Yacht Owners] Expected RPM at WOT

Nick Newington


Honestly carrying an extra ton will not make much difference. There is nothing wrong with the boat itself. 

It has to be the electronically controlled command to the common rail. Or some sensor that effects it. 

Good luck 


On 1 Sep 2018, at 17:52, Porter McRoberts portermcroberts@... [amelyachtowners] <amelyachtowners@...> wrote:

Nick. Thanks again. I agree!!  

This is long block #3 for this 1800hr D3
Bill Rouse and I think the devil is in the other parts. The “short block” timing system or electronics. 

Yesterday I compared WOT out of gear: 3200 rpm with no prop but in gear WOT: 3190rpm

 I think this test exonerates all but the engine itself. The only outlier could be the boat itself. But we have a clean hull. Not a barnacle or a growth. So weight??? We’re pretty full. 500 l of fuel but a full load with spares and  scuba tanks an air compressor etc. I think I may do a full water tank test run vs empty water tank test run. See what a 2000 lb difference makes. 

The other issue is Volvo. They’ve gone to ground. I think they are at a loss as well. But zero comms yesterday. It’s the weekend now. I’ll be curious what happens Monday. If anything. 

Thanks again


Excuse the errors.  
Sent from my IPhone 

On Sep 1, 2018, at 8:37 AM, trifin@...[amelyachtowners] <amelyachtowners@...> wrote:


Hi Porter,
This may be nothing, but for completeness I’ll mention it.

You seem to be hitting near max boost rather early, with pressure of 120kPa at 2200 rpm.
On my test with Autoprop, I was between 90/100KPa at 2200 and didn’t hit 120kPa until 2500rpm.
Your test was with fixed prop, and I would expect my pressure would be even lower with a fixed prop.

That’s a significant difference in my book, particularly with a software controlled engine.

For your reference, my no-load (neutral) turbo pressure numbers right now are as follows.

RPM. kPa

1400 0
1600 10
1800 10
2000 10
2200 20
2400 30
2600 30
2800 40
3000 40
3200 50 (WOT)

Can’t have too much data!


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