[Diy_efi] Diesel EFI?

[Avery Nisbet]

Most of the CRD based systems are Direct injection.  The engine you
have is indirect.  It has a pre-combustion chamber.
This may not be that big of an issue.  The bigger one would be finding
CRD style injectors that fit into your current head.

I don't think megasquirt has been used on a CRD engine yet.  I think
it has been used to control one of the VE pumps that uses feed back
from an ECU based on MAF and O2.

I don't know where you are located but. these small diesels from
Toyota are very hard to come by in the US.  Very little is known about
them here.

Quite a few people use the more available VW TDI engine for swaps into
toyota's and other small pickups.  Quite a bit is known about the VW
bosch based ECU's both Gas and Diesel.  This might make for a more
forgiving project.

-Avery

On Thu, Nov 18, 2010 at 7:03 AM, Mike <niche at iinet.net.au> wrote:
> Hi and welcome to the group,
>
> I'm not sure what you are trying to achieve overall:-
>
> a. Experience with EFI in general ?
> or
> b. Improve performance and economy ?
>
> or a combination of both - which is more important to you ?
>
> Each of these come with a price and a time versus capital cost issue,
>
> My electronic engineering thesis in 1982 was EFI with integrated transmission control
> and that was pretty ambitious at the time, the university's (max) $50 subsidy was exceeded
> by $1150 and although I managed to get a console running it fell short of expectations
> after 18 months.
>
> Now I have more experience in things like time management etc, I wouldnt want to tackle
> converting a mechanical diesel system to electronic - if you do want to do it, will the outcome
> be justified in terms of time and cost ? The hardware for the high pressures diesel operate
> under is not trivial. If you are looking to improve efficiency and perhaps alter the fuel source
> to perhaps use biodiesel then it would still be mostly an educational exercise. The nature of
> a (mechanical) diesel allows it to accommodate a wide range of fuels provided the cetane
> rating is comparable to the engine design criteria.
>
> Water injection is being used successfully to improve diesel efficiency and reduce peak
> bearing loads but a sizable amount of water is necessary, propane injection in conjunction
> with diesel is also being trialled to ameliorate some diesel deficiencies.
>
> But I wouldnt be keen on the complexities and possible dangers of changing mechanical
> injection to electronic injection - can you get injectors and pumps for that sort of pressure
> at a reasonable price ?
>
> Although we have concerns about long term petroleum supplies, petrol and alcohol will
> still be around for at least a couple of decades at a price that is still *today* lower than it
> was in real terms than the 1975 energy crisis... ?In any case liquid fuels will be around
> for a long time to come, ie After petrol, then alcohol, LPG etc As the energy delivery
> infrastructure is vast and not likely to shift that quickly to CNG or LPG, especially so,
> since other forms of liquid fuel are coming on stream...
>
> So some idea of your expected outcome and why you are going down that path would be of interest ?
>
> Regards
>
> Mike
>
>
>
> At 08:10 PM 11/18/2010, you wrote:
>
>
>>Guys, this is my first post to this list!
>>
>>I have been reading most of it for a couple of years now ?
>>I have an old Toyota Diesel truck so I was unable to work on an EFI project (it has the mechanical injection pump).
>>
>>Recently I was thinking about 2 options, one is changing the pump to a common rail setup, and then put in an EFI system that controls the Injectors.
>>2nd option is getting a new Toyota D4D engine (without the ECU) and adding an EFI system to it.
>>
>>I was thinking about MegaSquirt, as the last V3 is supposed to be able to provide sequential Injector signal ? Is it enough for a Diesel?
>>
>>I would appreciate any comment on the subject!
>>
>>Thanks,
>>
>>Yakir Green
>>
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