Diesel Optimax announced - Page 2

Turbodiesel · 20 May 2015, 17:21

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.

Turbodiesel · 20 May 2015, 17:28

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!

Turbodiesel · 20 May 2015, 17:34

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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!

uncle al · 20 May 2015, 18:09

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.

Mollers · 20 May 2015, 18:21

Quote:

Originally Posted by Turbodiesel

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?

willk · 20 May 2015, 18:45

Quote:

Originally Posted by Mollers

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?

Bigtalljv · 20 May 2015, 19:01

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

Mollers · 20 May 2015, 19:02

Quote:

Originally Posted by willk

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.

Turbodiesel · 20 May 2015, 19:04

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.

Turbodiesel · 20 May 2015, 19:05

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!

Mollers · 20 May 2015, 19:09

[QUOTE=Bigtalljv;678951 Just my old Ford F250 and it's big old 7.3L V8 diesel. Redlines at 3K

Jason[/QUOTE]

That's 'coz those boys were powered by cubes, loads of 'em.

Modern diesels are now titchy and twitchy and hence require lots of stuff like multivalves, turbos, superturbos, intercoolers etc. to produce respectable power, but more importantly economy and low emissions. Torque tends to fly out of the window however.

Bigtalljv · 20 May 2015, 19:15

I got a turbo, an intercooler, and multi-valves.....what I don't have is common rail injection. we should argue if that's the single biggest "improvement" to diesels

it accounts for increased HP and better fuel economy. The new Ford Powerstroke ('11 onwards I think) has significant more of everything than my truck. A friend (a cowboy who has the same truck I do but with some mod's), his wife got a 2011 F250 and he was blown away by it.

I was just looking and Banks Power got a Dodge diesel pickup to go 220mph....

Mollers · 20 May 2015, 19:26

Quote:

Originally Posted by Bigtalljv

I got a turbo, an intercooler, and multi-valves.....what I don't have is common rail injection. ....

That would just be greedy on 7.3Ltrs.

IMO, BMW lead the way in medium size diesel development. The early '90s straight six 2.5Ltr TDI was the benchmark from which they've continued to develop.

willk · 20 May 2015, 19:34

Quote:

Originally Posted by Mollers

Torque tends to fly out of the window however.

Depends on which overturboed lump you buy:

Mollers · 20 May 2015, 19:44

Quote:

Originally Posted by willk

Depends on which overturboed lump you buy:

I was referring to small capacity (titchy) diesels , that fecker is 4.4Ltr!

willk · 20 May 2015, 19:47

Quote:

Originally Posted by Mollers

I was referring to small capacity (titchy) diesels , that fecker is 4.4Ltr!

Pfft! It's lifted from a Landcruiser - wee buns!

Mollers · 20 May 2015, 19:55

Quote:

Originally Posted by willk

Pfft! It's lifted from a Landcruiser - wee buns!

The weeest bun is the daftness fitted in the VW Amarok. VAG build some proper TDIs including a 5Ltr V10. So what do they fit in their big buff pick-up truck? A poncy 2ltr Golf engine! By means of an asthma inhaler, they did throw in a supercharger.

Chris · 20 May 2015, 21:18

Quote:

Originally Posted by Mollers

The weeest bun is the daftness fitted in the VW Amarok. VAG build some proper TDIs including a 5Ltr V10. So what do they fit in their big buff pick-up truck? A poncy 2ltr Golf engine! By means of an asthma inhaler, they did throw in a supercharger.

Twin turbos and 180BHp combined with an 8 speed DSG gearbox makes it a very nice drive, tows 3.2 tons as well.....

Xk59D · 20 May 2015, 21:24

3.2 tons with only a 2 litre 180bhp....ermmm.....no thanks.

cheers

beamishken · 20 May 2015, 22:22

That is 10hp more than a 3.0 hilux but I wouldn't want to tow 3.2tonnes with any pickup regardless of the stated capacity might be ok on the straight but you'd be in trouble if it got out of line at all unless it was well loaded too.
My pal has a 3.5tonnes vw crafter as a race van with the same engine & it runs overweight constantly & seems to be holding up to the punishment pretty well & pulls like a train apparently.although he did lease it with the intention of swapping it once it's lease is up as he wasn't sure what the life expectancy would be with such a small engine working so hard
Personally I'd have thought the pickup would have sold better with the 3.0l v 6 fitted