Thread: Stage 1 V8 - Weber Carburettor

Hi Dundee,

You might want to post the question in the general technical section as these engines were common to all the Landrover products at the time but were fairly rare in Series 3 as they only came out very late in the stage 1.

General things to do with carbies though, yes you may have to play with the jetting if it wasn't already supposed to be set up for that particular engine, and even then some tuning mat be required for your particular setup, changing jets is the only way to tune a carbie. However it would be worth checking things like float level and that the needle and seat are working properly, both of those can cause flooding. Webers are also sensitive to fuel pressure, too high and they will flood, so may need a regulator in the line.

TimJ.

[timj How do you go about putting a regulator in line I have a series 3 game and put a weber carby on it, and when it is up to normal temperature it does not like to accelerate in 2nd or 3rd, if I slowly ease the throttle it will pick up without kicking. when up to speed it will cruise at 100 k,s all day with the range rover diffs. any ideas
Regards BobQUOTE=Timj;1542493]Hi Dundee,

You might want to post the question in the general technical section as these engines were common to all the Landrover products at the time but were fairly rare in Series 3 as they only came out very late in the stage 1.

General things to do with carbies though, yes you may have to play with the jetting if it wasn't already supposed to be set up for that particular engine, and even then some tuning mat be required for your particular setup, changing jets is the only way to tune a carbie. However it would be worth checking things like float level and that the needle and seat are working properly, both of those can cause flooding. Webers are also sensitive to fuel pressure, too high and they will flood, so may need a regulator in the line.

TimJ.[/QUOTE]

Hi Bob,

The weber you are talking about is probably a very different carbie to the one that Dundee has. However there are still a few options, the Weber used on Series vehicles as a standard carbie is a 34ICH I think and that is just a single barrel that is similar in flow rates and such like to the Zenith or Solex. There are two others that are used sometimes that are dual barrel but they are rarer and I don't know very much about them. The fuel pump on the 2.25 engine is a mechanical pump and it doesn't put out enough pressure to cause problems with any of these carbies. If it is flooding then the float level or the needle and seat would be the culprits. If it stumbles when you accelerate then make sure the accelerator pump is working properly. You can see this by taking the air cleaner pipe off the top of the carbie and pumping the throttle by hand without the engine running, you will see petrol pump into the carbie if it working. On the Zenith there are a couple of different holes in the rod that drives the accelerator pump that give different amounts of petrol when you put your foot down, there would be a similar thing on the Weber, so worth trying both of those.

Apart from that if the jets are the right ones and the carbie is clean then other things could be the problem like spark, vacuum leaks, timing and all the other things that give similar symptoms.

Hope that helps a bit, I am not a mechanic, just a tinkerer and a landrover tragic but happy to help if I can.

TimJ.

I really confused here, when you talk about "Stage 1" what vehicle are you talking about?

What I know as a stage 1 was known in the UK as the SIII V8, (in Australia there were also Isuzu 4BD1 Stage 1) these had the flat front and I always thought twin CDI Stromberg carbies on the 3.5 V8.

Originally Posted by Lotz-A-Landies

I really confused here, when you talk about "Stage 1" what vehicle are you talking about?

What I know as a stage 1 was known in the UK as the SIII V8, (in Australia there were also Isuzu 4BD1 Stage 1) these had the flat front and I always thought twin CDI Stromberg carbies on the 3.5 V8.

Hi Diana,

That is what Dundee was talking about in the first post, replacing the Zenith/Strombergs with a single Weber 500 (American). It got discussed further in the technical section. Bob was talking about the Weber on a series 2.25 though so a bit of a thread hijack I suppose .

TimJ.

Thanks Tim

I wasn't sure about the first post but it was sure that Bob's post was the regular SIII and hence my confusion.

Diana

I had a twin throat downdraft webber on my subaru - it could not handle steep slopes with the engine loosing power due to fuel starvation and in cold weather the carbie would freeze up.

If you went easy on the throttle and stayed on the small throat you got acceptable performance and exceptional good fuel consumption but put the foot down and bring the larger second throat on line then fuel usage goes up big time. I had to spend a lot of time tuning the carby when I first got it and had it on the dyno.

A slightly larger webber than I had would work well on the 3.5V8 but there is the issue of not being able to climb steep hills.

Garry