Diesel engine running on gas

[jonule]

yes an old pump with an old system, impeccable!
effectively leaving it at idle, it then suffices to inject the (bio) gas, through the air circuit.
after the air filter I think it does not risk anything, anyway a gas bottle has its own safety regulators etc ... otherwise it would risk a lot for gas stoves ... the small injector can not heat in this place , it is not in contact with the engine t ° C;



examples of assembly carried out, and others (biogas compressor, ...):
http://www.gaspoweruk.co.uk/history/har ... tions.html
where we see the accelerator:

the injector:


it is on it is not an installation at 3000 €, without state aid!
but it is an "old" simple assembly:
http://journeytoforever.org/biofuel_lib ... _bate.html

like last night I saw a C3 CNG: it was a GRDF vehicle ...

make a "homemade" digester (which manages CO2 well):
http://biorealis.com/digester/construction.html
http://biorealis.com/digester/operation.html

[jonule]

if the 16kW diesel is an indirect injection with a ricardo comet combustion chamber, the chamber creates a hot spot which will explode the gas during compression before pmh

it is not protected by a valve? does it really go up in t ° C? what is the critical t ° C for gas explosion?
in indirect injection, the injector injects the fuel into a "prechamber" where there is air (and where the gas would be injected here), only when the valve rises ?!
before the valve is not lifted, it can't explode before, right?
what is this ricardo comet system? it exists on the XUD9 (PSA 1.9 diesel engine) for example?

http://www.techniques-ingenieur.fr/base ... 10007.html

otherwise here they sell the "pro" material to do it, (there must be some elsewhere as well), but I don't see them talking about indirect injection, are you sure about your info, chatelot16?
http://www.dieselperformanceproducts.com/
a presentation of the system:
http://www.dieselperformanceproducts.co ... tation.pdf

[wirbelwind262]

http://books.google.fr/books?id=LvsrbGZ ... et&f=false
edit: a mechanical page http://histomobile.com/dvd2.php?lien2=fr/tech/36-1.asp
and an interesting pdf: http://formameca.free.fr/formation/nati ... ustion.pdf

[chatelot16]

indirect injection with combustion chamber ricardo comet, it is the classic system of all diesel cars since peugot 403 ... it is only mercedès which had its system a little different with its combustion chamber prosper orange

there is no special valve: the admitted air is compressed in the cylinder, with a very flat cylinder head: all the dead volume is in the combustion chamber: the communication hole is quite small between cylinder and chamber: it makes a loss of energy which increases the heating

even when the cylinder head is made of aluminum, the combustion chamber is made of refractory steel, poor conductor of heat, so its surface rises in temperature ... the same kind as the hot ball of French or Lanz companies

[wirbelwind262]

to illustrate what chatelot16 said,
pages 48 and 49 of this document show the assembly and dimensions of the turbulence chambers (the insert is hooped in the cylinder head):



https://www.econologie.info/share/partag ... KQbmJh.pdf

[chatelot16]

no because at idle the injection pump is speed regulator! it sends what it takes to run at idle speed, as soon as it runs faster it does not inject anything at all, so no minimum dose to ignite

The news, yes!

But not the "old pumps"; there was a "physical" centrifugal regulator, with a minimum wedge ...

Now, in fact, it cuts to save / pollute less.

on my old diesel with centrifugal regulator, there is no minimum injection flow stop: when the centrifugal regulator finds that it rotates too fast it injects nothing at all

the slowdown stop is on the centrifugal regulator, not on the injection flow control

I do not see any injection pump with an adjustment screw giving a minimum injection flow

[Did67]

I'm not a motorist ...

What I know :

- on my old ZX Diesel, XUD engine, the injection did not cut when going downhill, when the engine was racing, without touching the pedal

- on the more recent Xantia TD, on the other hand, there was a solenoid valve which cut as soon as I was in this "freewheel" situation (without disengaging) [I had a "problem" on this solenoid valve that Citro¨n had the genius idea to put the pump inside!]

In both cases, they were Rotodiesel type pumps ... so "mechanical" ...

- and then now, we have the "calculators"

So a "ZX" type Diesel must be able to be supplied with gas with the injection which makes the match, right ??? I spoke of a stop. Maybe this is just the "minimum" position of the centrifugal governor ???

On the other hand, that the engine is not easy to regulate via the gas: probably, even if the LPG kits arrive there (in gas injection or in liquid injection, more precise; I have one of the two systems on each of my cars "LPG "). But there are calculators!

[swallowtail]

hello chatelot16


I run LPG or methane generator sets: I make a pressure regulator at zero pressure, or more exactly at pressure equal to atmospheric pressure, the throttle valve of the carburetor is normally controlled by the regulator and I put a venturi between the filter air and fuel: the regulator gas is sucked in by the venturi by an adjustment valve: the relage is quite sharp: too rich it stalls too poor it stalls too: but once the adjustment found it is valid for all power possible of the engine because the law of passage of the gas in the tap is exactly adapted to the law of the venturi

to regulate a new engine I make it start with the gas regulating tap closed and I close the regulating tap: I close the petrol tap: when the fuel is empty I must open the regulating tap gradually: when the carbu is empty I found the correct setting: there is no longer any need to touch it, and it starts at the first try with LPG

I would also like to operate in the future the small GPelectrogene (4Tps / 3CV) with purified biogas H2S / CO2.
Do you have any details on the venturi / gas tap that you made, or some photos? and other necessary modifications?
Question compression sleek boigas, where are you?
please
swallowtail

[chatelot16]

the shape of the venturi is really not critical, I made beautiful machined ... I also made it simpler and that works as well: an iron pipe the diameter of the intake pipe, crushed to shrink, and gas intake at the narrowest point

there is nothing wrong with the shrinking area being flattened rather than round

for compression I am in the process of creating a business, and there are some ideas that may merit being patented, so it's impossible to talk about it before the decision is made to patent or not

the patent system is thus made that the slightest disclosure before filing the patent renders a patent invalid ...

as soon as the patents are filed, or it has been decided not to patent, I will be able to put photos more easily

when certain decisions are made, I will know what to distribute as an advertisement of what will be for sale or what will be published to facilitate amateur realizations

[jonule]

in any case I do not know if it has to do with your creation of business, but it seems to me that LPG or biogas is well suited for indirect injections ?!
I have already changed cylinder heads of indirect injection engine, I can see how it is done, on the other hand it seems unlikely to me that it will damage the engine when using gas?
> do you have specific examples, Chatelot16, or is it a theoretical mistrust? have you had a negative experience?

in any case the experience of the injection pump at idle speed is easily verifiable: it suffices to leave the engine at idle speed, to move in front of the engine air grille and to inject "START PILOT" to see that the engine speed suddenly increases: the same can be done with a gas cylinder.

the carburetor is indeed a mechanical system which transforms the liquid gasoline into gas, with the air. formed of coarse gasoline drops, natural gas is necessarily thinner and more efficient, also less polluting.



to help you, swallowtail, I put all the links and illustrations you need, the venturi is the small bevel-shaped tube inserted in the air duct, the "adjustment valve" that you It must be a French / Quebec translation of the carburettor richness screw, it is an adjustment screw which is located on the body of the carburetor, which is normally tightened to 1 and a half turns by default, it makes it possible to adjust the amount of fuel for the engine (mainly at idle, but this also affects the other speeds of the blow).