Weber Carburetters

[danie]

Hi Ronnie

As far as I can remember the pipe (connected to the valve at the exhaust manifold) gets connected to the Intake Manifold on the "engine side" of the carb.

Have you checked the gasket where this pipe gets connected to the Intake Manifold ? - or maybe the valve at the exhaust manifold is faulty

Danie

[marius]

Hi Spikes - as say it is VERY DARK over here ;D

[ronnie]

Hi Marius

The pump is fine pumps plenty petrol. The air filter is fine as well as it is still on the bench ;D. I agree it sounds like an air leak but there are no leaks that I can find. It is probably wrong to say NOISE as this conveys the wrong message. The motor is fine it just surges very bad with the Weber but is still there with the Solex but much milder. All vacuum pipes I have blocked of with vice grips but no difference. This problem started with the Solex so I will not refit the weber till the problem is solved.

Ronnie

[ronnie]

Hi Danie

I have checked all gaskets, washers etc and don't know what to check next.Charles I did check the timing with the weber, and even changed it to see if it made any difference. It was running so bad I could not reset it properly until I had reinstalled the Solex.

Ronnie

[ronnie]

Hi Danie

If you are still refering to the small drain pipe they were never fitted with valves on any car that I have seen. The opening is very small about half a mm not enough to affect the mixture to any extent.

Ronnie

[ronnie]

Hi Spikes

No condensor as it is electronic.

Ronnie

[ronnie]

Hi All

Just remember the problem is only at idle on both carbs, they both rev without any hesitation, and the Solex will acelerate to 135kph with no problem and it is still pulling well.

Ronnie

[danie]

Dec 6, 2010 20:45:01 GMT 2 ronnie said:

Hi Danie

If you are still referring to the small drain pipe they were never fitted with valves on any car that I have seen.

Ronnie

Hi Ronnie

No, I am referring to the pipe which enters the Intake Manifold at the opposite side of the small drain pipe.

Danie

[ronnie]

HI DANIE That would be the one which used to feed the EGR system. I have modified that for a vacuum feed for the small pipe from the crankcase as the Weber has no provision for it. The gasket is fine and the point is blocked of at present.

Ronnie

[hotstuff]

ok the problem might be the correct jet sizes as i had that with my weber battle for ever till a guy who works on webers said i needed to change the idle jets will look to see what info i have somewhere.
reason being it is pumping more fuel than the solex on idle. thats what they told me.
mine is at 750rpm sharp and smooth

[danie]

Hi Ronnie

Another wild guess - maybe the advance / retard system on the distributor could be faulty ?

Danie

[ronnie]

Hi Danie

Acording to the timing light the advance retard is working ok.

Ronnie

[ronnie]

Hi Mike

The problem started with the Solex not idleing steady. The webber is worse. I have put the Solex back on as I think it must be correct before I play with the Weber.

Ronnie

[danie]

Hi Ronnie

If you have disconnected the pipe to the EGR valve, maybe the engine noise is coming from the EGR valve at the exhaust manifold ?

Danie

[marius]

Hi Ronnie

At least we know now the Solex isn't as bad as it was made out to be ;D

The only thing that makes sense to me - esp if the ignition/timing/plugs is ok - would be an air leak somewhere

Hope you get it sorted soon Comrade.

Regards
Marius

[hotstuff]

hi ronnie
i am still sure it is the idle jets and if there is a leak spray with carb cleaner also you might need to check float levels as i had to on mine.
there is also an air intake pipe some where that needs blocking not sure on the 36 tho.
pity you are not close by i could of sorted it out for you quick. very difficult via notes lol

[ronnie]

Hi Marius

The Solex is not good either, the idle is terrible and it cuts out every time you stop. I have checked every thing and can find no air leaks. That is why I removed the inlet manifold so I could check the underside.

Ronnie

[ronnie]

Hi Danie

There is nothing of the egr system on the car. I removed it all and blanked off all the connections. It is all most annoying

Ronnie

[marius]

Just kidding Ronnie - it sounds to me the problem is not the carb though

Sounds like a solenoid cut out problem - but it's not if it is the same on both carbs.

[ronnie]

H Marius

The problem is the same but the Weber is worse. That could be due to incorrect jets. Mike is checking jet sizes for me. Looking at the idle jets the ones fitted are smaller than the ones recommended for the 1600 Niva.

Ronnie

[ronnie]

Hi Danie

My choice of the word "noise / sound" was a bad choice it perhaps should have been "acts like an old diesel"in the way it idles. There is no bad noise from the motor. Sorry

Ronnie

[spikes]

Hi ronnie
found this on lada UK forum: Theinfo was from Baxter himself
Posted: Fri Feb 12, 2010 7:53 am Post subject:
I may have inadvertently stumbled upon someone who has set their jets using a wideband.


If my reading of the translation is correct:

Jokari from Finland used a wideband to determine optimum Weber jettings to get 8.2l/100km around town, and good torque from about 1800rpm with peak torque at 2400rpm, on his otherwise standard 1600 Niva using:

F50/F6 emulsion tubes
3.5/4.5 Diffusers
150/150 Mains
170/190 Air-correctors
55/80 Idles

Regards
Spikes

[spikes]

Hi Ronnie
See attached spreadsheet. Info on webers are at the very bottom
Lot of detail in spreadsheet that other readers may find interesting.
Regards all
Spikes

Attachments:

[ronnie]

Hi Spikes

The problem with all the settings you see they are for the 1600 Niva and there seems to be lots of different settings depending on where you look. I have an old Auto Data Digest from the year dot which has a spread sheet similar to yours but try to find a 1700 with a 32 / 36 and you won`t find one. I will wait on mike as he already has a Weber fitted so will have an idea what the jets should be. It was great when I lived in Jhb as I knew all the places to go. Here there is NO place to go and I do not know Durban.

Ronnie

[ronnie]

Hi Spikes

I have just had another look at Jokari on Baxter's site and again they are for the 1600. The jets he is using are all larger than the ones in the Weber I have. If you find a 1700 Weber jet chart let me know

Ronnie

[danie]

Hi Ronnie

I know about a company in Pinetown who specialized in Weber carburettors. I forgot the name but I do know where they find themselves - if they haven't moved since I've been there about three years ago.

If you do need more information, I could try to find their contact details.

Danie

[ronnie]

Hi Danie

When I compare the jets in the Weber with the ones specified for the 1600 Niva they appear to be small, so perhaps that is the problem. Can`t find any reference to 1700 Niva`s anywhere. I will see what Mike comes back with.

Ronnie

[ronnie]

Hi Danie

Thanks, If you can find out the name let me know just in case I need parts at any time.

Ronnie

[spikes]

Hi Ronnie
I'll have another go at searches. With all the rain we are having its going to be an uphill wet battle to get the staff quarters painted... so I can spend some time on the net
regards
S

[ronnie]

Hi Spikes

I hope you have more luck than me I have looked plenty

Ronnie