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Old 20 May 2015, 13:21   #21
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It was pretty good really, only issues noticed were poor starting from cold but I'm told
Merc have re calibrated the ecu to get over that now. I have some video of it but for some reason it won't let me upload it.
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Old 20 May 2015, 13:28   #22
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By the way I have been testing this engine in various forms for about 6-7 years! From the early JP5 variants so
spent more hours than I can remember playing with them. They are less power than the petrol version but then they are not pretending to be either way it's a big achievement getting a petrol spark ignition engine to run diesel!
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Old 20 May 2015, 13:34   #23
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Click image for larger version

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Here's me testing the pre production versions back in 2009!! Spent hours and hours driving this one trying to get more speed and better performance!
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Old 20 May 2015, 14:09   #24
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I remember those as well, you worked your bone to the finger,(had lots of fun) and got paid for it as well.It is well past the time that the factory got involved with the R & D.Of these beasts.
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Old 20 May 2015, 14:21   #25
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either way it's a big achievement getting a petrol spark ignition engine to run diesel!
What is the resulting gain in giving it a spark? One would imagine that high performance road going DERVs would be wearing spark plugs if more performance were on offer.

The ECU must have to do clever things to prevent double detonation?
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Old 20 May 2015, 14:45   #26
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What is the resulting gain in giving it a spark? One would imagine that high performance road going DERVs would be wearing spark plugs if more performance were on offer.
God knows I'm not a mechanic, but is the point here that this engine isn't actually a diesel - it just runs on it with a bit of trickery?
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Old 20 May 2015, 15:01   #27
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Probably for the RPMs? I was always under the impression that normal compression fired diesels (or whatever the fancy term is) were limited by that. When the RPMs get to high you can't advance a spark that isn't there and the combustion timing doesn't work out. but I'm not familiar with marine diesels and what RPMs they run at. Just my old Ford F250 and it's big old 7.3L V8 diesel. Redlines at 3K

Jason
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Old 20 May 2015, 15:02   #28
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God knows I'm not a mechanic, but is the point here that this engine isn't actually a diesel - it just runs on it with a bit of trickery?
If it runs on diesel, it's a diesel.

In the day, diesels not having an ignition system was a bonus. Get the fuel in and the air out and it ran. Now they're every bit as complex as fancy pants petrols.
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Old 20 May 2015, 15:04   #29
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Lots of trickery! Different compression ratios, knock sensors, mega mega ignition to timing and different spray patterns on the injectors, different air injection timings too. It's a massive thing to test we spent hours and hours just testing acceleration at one temperature it takes years to get the ecu programmed to run well at every altitude, temperature, boat weight, boat type it's mega. It was an awesome programme to be involved in, and I learned so much from it.
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Old 20 May 2015, 15:05   #30
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Yes uncle Al I remember you helping me out in the phone when one broke down and it wouldn't start! Turned out to be a flywheel sensor if I remember correctly!
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