[Amel Yacht Owners] Re: Expected RPM at WOT
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Dean thank you The turbo does spin up. More with load of course. I am able to measure pressure. 1000 rpm temp 78c and 0 kPa quiet 1500 rpm temp 79c and 20 kPa high pitched whir sound bit no vibration 2000 rpm temp 81c and 70 kPa quiet 2200 rpm WOT 84c and 110/120 kPa quiet Volvo has yet to respond. Porter. A54-152 On Aug 31, 2018, at 3:16 PM, trifin@... [amelyachtowners] <amelyachtowners@...> wrote:
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Sounds to me that you should just go fast! LOL
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Sorry for your continued difficulties, just keep enjoying paradise and smile, it makes everything better! Cheers
Courtney
s/v Trippin'
54 #101 Grenada -----Original Message----- From: Porter McRoberts portermcroberts@... [amelyachtowners] To: amelyachtowners Sent: Fri, Aug 31, 2018 4:51 pm Subject: Re: [Amel Yacht Owners] Re: Expected RPM at WOT Dean thank you
The turbo does spin up. More with load of course. I am able to measure pressure.
1000 rpm temp 78c and 0 kPa quiet
1500 rpm temp 79c and 20 kPa high pitched whir sound bit no vibration
2000 rpm temp 81c and 70 kPa quiet
2200 rpm WOT 84c and 110/120 kPa quiet
Volvo has yet to respond.
Porter.
A54-152
Excuse the errors.
Sent from my IPhone
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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! Cheers Dean |
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Thanks Courtney
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Maybe that’s the way to go!! We’re getting a top lesson in patience, and despite this situation enjoying the hell out of ourselves. Whales galore, beautiful islands, dolphins on the bow for hours at a time. Girls getting back into school. Awesome and incredibly understanding and supportive wife and family, cool and helpful folks at our “local marina” ha! Now I really have to learn the white floppy things above us! And this is an amazing boat. The plan was to reject the usual and let the world mold us into something new, tighter, more appreciative, patient, sentient and kind. It’s happening. The trip is on the inside. We’ll get there! Whenever there is ready for us. That’s our mantra this am! Porter and Crew S/V IBIS 54-152 Isla Contadora, Panama On Sep 1, 2018, at 5:02 AM, Courtney Gorman Itsfun1@... [amelyachtowners] <amelyachtowners@...> wrote:
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Porter,
Further to my last ... Here’s a scenario... Let’s assume your boost sensor is reading higher than it should (faulty sensor) or the pressure IS higher than it should be (faulty Turbo?). Let’s also guess that the software which reads this pressure signal reacts by limiting the rpm from going any higher when some max pressure value is reached, say 120/130kPa. (Seems like a reasonable reaction), This scenario would produce the symptom you are seeing. In the no-load situation, the boost pressure does not get high enough to limit the rpm, and it just tops out at 3200 as usual. In the load situation the pressure (or pressure perceived by the sensor) reaches a maximum limit and the software prevents rpm from going any higher. This could also explain the Autoprop effect you saw. The AP may have loaded the engine erratically, such that max boost was reached in an instantaneous way because of the erratic load and the software immediately tried to reduce rpm. The smoother load curve of the fixed prop would probably not affect the engine so dramatically. Guesswork in the dark. Cheers Dean |
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Thank you Dean.
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This will help. I’ll run it out of gear and see what comparisons I get. I think the devil is in the load algorithm though. And to respect the little bugger we might have to sacrifice the whole. I hope not!!!! Porter A54-152. I’ll run the test. Thanks again!! On Sep 1, 2018, at 8:37 AM, trifin@... [amelyachtowners] <amelyachtowners@...> wrote:
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Nick. Thanks again. I agree!!
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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 Porter A54-152 On Sep 1, 2018, at 8:37 AM, trifin@... [amelyachtowners] <amelyachtowners@...> wrote:
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Dean, you and Bill have both come to very similar conclusions and I think they are by far the best fit to explain the circumstances.
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Some “soundthinking” indeed. And very appreciated. The other issue I am dealing with is interacting with self described technicians not mechanics. People who look at screens not think about systems. Nothing against nurses but why I think we still need doctors (when they are doing their jobs well!). I appreciate your thinking very much. Porter A54-152 On Sep 1, 2018, at 9:16 AM, trifin@... [amelyachtowners] <amelyachtowners@...> wrote:
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Hi Gang Very interesting and great thinking scenarios Dean made. Definitively worth to check! Just for curiosity and for completion if someone is interested. I made same RPM test with and without load today. Test with AUTOPROP, Calm sea, little wind, no current. Interestingly my "no-load" turbo pressure number are lower than those reported from Dean (ink. 2 with 0 kPa on 1600/1800). I’m not an Engine-Engineer, so I can’t interpret the difference. For your reference, load test with AUTOPROP , RPM, temp. turbo pressure numbers : RPM. Temp kPa 1400 78 10 1500 79 10 1600 79 20 1800 79 40 2000 79 60 2200 80 90 2400 80 110 2600 81 110 2800 82 120 My no-load (neutral) numbers are as follows: RPM. temp kPa 1400 76 10 1500 76 10 1600 77 0 1800 77 0 2000 77 10 2200 77 10 2400 77 20 2600 78 20 2800 78 30 3000 78 30 3200 78 30 (WOT) Best Ruedi SY-WASABI A-54.#55 Von: <amelyachtowners@...> on behalf of "trifin@... [amelyachtowners]" <amelyachtowners@...> Antworten an: <amelyachtowners@...> Datum: Samstag, 1. September 2018 um 17:16 An: <amelyachtowners@...> Betreff: Re: [Amel Yacht Owners] Re: Expected RPM at WOT Porter, |
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Hi Ruedi,
You’re right about the no load numbers, and interestingly your ‘load’ pressures are around 5-10kPa lower than mine across the board. Importantly though, we are both significantly below Porter’s pressure numbers at any given RPM. This is all good data for Porter in his discussion with Volvo. See you in a few days. We will be staying in the Dioni Boutique Hotel in Preveza on Mon/Tues nights, so easy catch up in town when you arrive. Cheers Dean |
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Cheers Porter
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Sounds like you are all in the right state..........of mind!!
Courtney
svTrippin
-----Original Message----- From: Porter McRoberts portermcroberts@... [amelyachtowners] To: amelyachtowners Sent: Sat, Sep 1, 2018 10:16 am Subject: Re: [Amel Yacht Owners] Re: Expected RPM at WOT Thanks Courtney
Maybe that’s the way to go!!
We’re getting a top lesson in patience, and despite this situation enjoying the hell out of ourselves. Whales galore, beautiful islands, dolphins on the bow for hours at a time. Girls getting back into school. Awesome and incredibly understanding and supportive wife and family, cool and helpful folks at our “local marina” ha! Now I really have to learn the white floppy things above us! And this is an amazing boat. The plan was to reject the usual and let the world mold us into something new, tighter, more appreciative, patient, sentient and kind. It’s happening. The trip is on the inside.
We’ll get there! Whenever there is ready for us.
That’s our mantra this am!
Porter and Crew
S/V IBIS 54-152
Isla Contadora, Panama
Excuse the errors.
Sent from my IPhone
On Sep 1, 2018, at 5:02 AM, Courtney Gorman Itsfun1@... [amelyachtowners] <amelyachtowners@...> wrote:
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