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Carb from a chainsaw on a Lada (attempt to save)

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I decided to make a separate mini-carburetor and maybe even connect a separate gas pedal to it. What for? To save.
As a basis, I decided to take a carburetor from a chainsaw. It is membrane, very well tuned. As for the throughput, I think it will be enough to spin the engine up to about 2000 rpm. And this is more than enough.

So again, what are the pros?
1. Good mixture formation (IMHO, but it is better than on a VAZ with these emulsion tubes, a million nozzles and other garbage)
2. A very fine adjustment of the quality of the mixture with a screw on the carbide.
3. Expected savings. I think if you drive purely on such a carbo, without the main one, you can meet 5-7 liters, instead of 10-11 liters. Well, it's all in the eye.

Today I tried to do it all. He removed the carburetor from the old chainsaw, removed all the flaps. Then he cut off a piece of a copper tube, it tightly "twisted" into the channel of the carba to the diffuser. Connected to the car tank gas tank.

Of course I haven’t installed the carburetor yet. It turned out to install the "carburetor in the carburetor." That is, I inserted a small carb tube in the first chamber of the Zhiguli carburetor (well, this is just an experiment). The remaining space was stuffed with rags.
The fuel supply hose to the native carb plugged with a stick.

He started the car by pouring some fuel directly into the manifold. While the car was idling (there was fuel left in the carburetor), I manually tried to gass. The mini-carburetor works fine, from the atomizer (nozzle) fuel is clearly coming in the form of an emulsion (fog). But the engine does not hold revolutions, it stalls, apparently too little gasoline. Turned out all quality screws. To no avail.

Probably a lot of air sucks through a rag, the mixture is poor for work. I will chemize further. I will unsubscribe about the results.

I apologize for the quality of the photos))

Carb from a chainsaw on a Lada (attempt to save)



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24 commentary
Author 0
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interest is growing, so you have to do))
Guest Shurik 0
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My father was engaged in such savings. Only he bought January 7.2, and put nozzles on the VAZ 2109.

Firmware rules itself (and hundreds of different ones are on the network).

As a result, the depletion of the mixture leads to detonation, the computer did not have time to enrich it in terms of mass flow rate (it would have gone through with E-gas, it just opens the damper with a delay after the injectors). The meager savings on the highway turned out to be 3.5 liters per 100, but any acceleration and start-stop mode are hard to save. Starting a cold engine when trying to save was often not very good, a couple of starts for a set of fuel was required. The dynamics are also easy to maintain - the dependency tables of the throttle position and mixture composition can be edited differently for different modes - but the result is still not the same. Elemental oil - for 100,000 cycles gives even no less effect - and this at 2000 rpm and for 4 cylinders is not so long.
Author 0
Reply To quote A complaint
Nothing, he sold the old car, reluctantly spoil the new one. It is necessary to make a plate for the intake manifold and try to install only carb from the chainsaw instead of the standard one. Yes, all the time there is no ((
0
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Dmitry, what’s up there, what's new in the experiment?
+1
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Put on each cylinder a personal carburetor - and you will be happy, this method of boosting engines was used in 1970-1980 on rally and racing cars.
In this modernization - the resource suffers a little and the engine efficiency increases, but the fuel consumption - this setting all depends on the gasket between the steering wheel and the seat.
Author +4
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Yes, everything stopped on the main jet. No way the hands reach the final experiment.
-5
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Well, what is there? Have you already driven a chainsaw to the forest? Cut it with "Lada" ??? : grimacing:
Author +2
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So far, the mini-carb has not been connected, but implemented another experiment.

1. Underestimated the level in the float chamber to almost half the carburetor. That is, instead of a few millimeters before laying, I now have a distance of a couple of centimeters)))
On the contrary, this had a positive effect on the engine, and began to tear from under it.

2. Made a much stiffer second spring damper (I have it on pneumatics).

Total today drove in mixed mode 90 km at 6 liters! Moreover, I almost didn’t drive, the engine turned well, did not save. Maximum speed for a small hill of 100 km / h.
I'll try to ride tomorrow without a second camera at all, turn it off.

I have a "five-carb" carburetor, jets 170-air, 107-fuel. If anyone is interested. The 11th engine (cheap).
Author 0
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Today's report ...

Using a carburetor from a chainsaw, the Zhiguli engine can be made to work at such speeds that the manufacturers probably could not get it to work: laughing: The mixture is incredibly flexible, the engine can be configured as in a foreign car, it works very softly and quietly. It is impossible to achieve this on the native carburetor, the engine at low speeds immediately starts to kick. And at low speed it is possible to underestimate quite a lot. And again, a plus.

On the transition system, the fuel tank from the chainsaw lasts for quite a while.

Today I connected the carburetor through a short hose to the manifold. Everything is fine, you don’t even need to fix it, the throttle is also connected elementarily. But there was a problem - the main fuel jet does not want to work. It seems that everything is fine, but the fuel does not go. We will look for a reason.
-2
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Quote: Valery
You also confuse compression with the degree of compression .... Oh bida-ah !!!! )))))))

Well, why confuses, he just does not know.
0
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You also confuse compression with the degree of compression .... Oh bida-ah !!!! )))))))
-3
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Quote: Dmitrij
You give in essence, why yes, why not. Specifically in fact.

But in fact, I already wrote to you, study (at least) the work of the carburetor of the same "zhegul". Although the question is much wider in cognition. You carry such a spawn from your knowledge, at the level of the layman. That's why I told you that to prove you need to start from the school bench of an engineer.
Author -1
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Efficiency increases by increasing compression! Old engines with low compression consumed a lot and smelled strongly))) But there is a limit, excessive compression leads to detonation, so the engines during installation of the turbine bore (intentionally underestimate the native compression). There is an increase in the combustion chamber.
Author 0
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Valery, you can put different carbs on the same machine, consumption and power depend on this. This is a proven fact. For example, the consumption on the carburetor from the five on the 011 engine (cheap) is 7.5L, while on the native with economical driving 10. Is there a difference?

Another example is the Volga 2410 engine. I had a Zhigulevsky carb (Gas 69 car) on this engine, the flow rate was 14-15 liters, I put the Volgovsk carb K151, the consumption became 18l.

Moreover, driving styles were the same everywhere.
-3
Reply To quote A complaint
You see, Dmitry, everything is far from simple ...
Here is an example:

Everyone, I think, knows that if you take two engines of the same POWER (not the working volume), atmospheric and turbocharged, then turbocharged will be more economical.
In order to achieve more power, air is pumped into it by a turbine, respectively, more air is pumped into the cylinder and we can burn MORE fuel, as a result - get more power !!! ...
So where does profitability come from if we burn MORE fuel ???
.... That's right - from a higher efficiency !!!.
-2
Reply To quote A complaint
Oy-oy-yoy !! ... All this could be done easier:
Take the carburetor from the chainsaw, look at it carefully, and then put it on the chainsaw.))))
In Zhiguli, on the other hand, put a brick on the polik, in the area of ​​the pedals and move it so that it limits the pedal pressure by half ....))))
All!!! Savings achieved !!! ))))

You see, Dmitry ... As I like to repeat, "You are not smarter than 200 German engineers who thought about it!"))). In this case - Italian, but not the point))))).
So, the carburetor is done "under the engine." It provides VARIOUS modes of operation ...
That is .. Our task is to get the greatest power from the engine, and under this condition burn as little fuel as possible ... Hence the complexity of modern carburetors, due to their multi-mode ...
Your option (to put a primitive carburetor) will provide savings only due to its low throughput .. But the efficiency of the engine will decrease. If you adjust the position of the brick under the pedal so that the throughput is equal to the chainsaw, the effect in terms of efficiency would be better for the native ...)))))
Author +2
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Yes, no need to convince me. You give in essence, why yes, why not. Specifically in fact.
I called the pros, do not agree? Justify.

And I don’t need to read the Sermon on the Mount here.

However ... you can not justify, it remains only to connect the throttle and measure the flow. While a smoke break.
+1
Reply To quote A complaint
: innocent: Apparently, persuading yourself is more expensive (this is understandable). I recommend removing the engine from the car and adapting the chainsaw engine. The power will be the same as that of the "Lada" with a new carburetor, "but how many pluses ?! Small-sized, air-cooled, low weight, low gas mileage, automatic gas coupling ...
Author -2
Reply To quote A complaint
Here is the current development phase.

I removed a plastic pipe from the saw engine that connects the carburetor to the cylinder. I inserted a piece of copper pipe into it, glued it with superglue. Holds very tight. Now the whole structure is easily connected through a piece of hose to the fitting for the vacuum amplifier on the manifold.

The carba now has a throttle, there is an air filter. You just need to connect the gas pedal and adjust.Single turns will remain native, that is, on the Zhiguli carbo. A carb chainsaw will be needed for gas and an economical ride.
Of course, the idle will be configured as accurately as possible.

The mini-carb will probably eat from the main one, I think I’ll get tubes in the float chamber.

Another photo
http://rgho.st/7Jw7zV5pg


-----
I drove again. He disconnected the gas hose from his native carb. Idles are tuned on a small very well. When the shutter is opened, about half the engine spins 3,000! The question is, why then do you need these relatively large diffusers in your native carba? True, I do not have people sucking air through my own carb, but still.
Gravity is normal, I do not see much difference. The mix is ​​amazingly customizable. Mixture formation is also excellent.

By the way, I also forgot that the mini-car has a transition system. Right next to the damper there are two holes, an emulsion goes through them with a small opening angle of the damper. This flow is configured with screw L.
And the main jet this time was not involved at all, it is configured with the H. screw.

Another plus surfaced - in the system there is NO accelerator pump, which with each pressing the pedal injects a couple of milliliters of fuel. And without it, everything works fine.
0
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Quote: Dmitrij
If you look at the carburetor spray with a small throttle opening, then gasoline literally Pours out of the carburetor in a stream. And is this a mix of yours?

And you study the operation of the carburetor "Lada" and you will cease to seem. But when you understand this, maybe something new and come up with. Good luck.
Author 0
Reply To quote A complaint
Yes, this is not the question, the question is in adjusting the native carb. This is the whole cat with the selection of jets, emulsion tubes ... to put it mildly, it does not suit me. And the question of the quality of the mixture at low speeds is in great doubt. If you look at the carburetor spray with a small throttle opening, then gasoline literally Pours out of the carburetor in a stream. And is this a mix of yours?

And on a small carbox at low speeds, the flow rate through the diffuser is enormous, because of this the fuel is crushed into the smallest particles, into fog, in short, the quality of the mixture is simply excellent, and also finely tuned.

And I always go mostly on the bottoms, I rarely twist more than 2000 engines, I try to increase the speed at the gearbox and lower the engine speed. So the most economical.
0
Reply To quote A complaint
Nothing good (working) will come out of this venture. Each engine should receive its portion of a quality mixture. During combustion, it should form the necessary volume of gases, creating the necessary pressure for the engine to work. Saving fuel consumption is not achieved by reducing the throughput of the carburetor.
Author +2
Reply To quote A complaint
I drove 1.2 km in a straight chainsaw on a chainsaw carburetor, a little more than half of the gas tank burned out. How many in the tank, I don’t know, I think 350 grams. I drove by itself without a throttle, at the same speed, only switched speeds. 40 km / h accelerates))
But this is without settings, without anything.

But the car died out after 1.2 km. She just turned into a moonshine. Just carb connected through a hose longer than 1 meter. Due to the vacuum, this hose became very cold, even covered with water. Of course, condensation also began to accumulate inside this hose and water went into the dviglo. But all this is solvable.

In general, I am inspired)) The thrill of riding is cool. Such an unusual whistle ...
Author +2
Reply To quote A complaint
Eureka! Everything works. The engine rotates without fine tuning 2500 rpm, with such speeds you can accelerate even to 70-80 km / h.

I connected the carb directly to the collector, namely, to the place where the hose was connected from the vacuum brake booster.The diameter of the tube of my carburetor and the diameter of the fitting completely coincided.

He returned the choke to his mini-carburetor, it is very easy to adjust the quality of the mixture with it. It remains to figure out how to connect the carburetor so that it can be installed back throttle.

I’ll set it up, ride, I will unsubscribe about the expense.

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