Webers

[rose5691]

This might be worth purchasing, Weber manual .

Quite well written, makes good bedtime reading  

Mel

It should arrive tomorrow. Cheers for that

[Norman Verona]

The carb king was a chap called Sid Borritz. He worked at University Motors and was in his 60s when I was an apprentice in 1961.

Cars were sent from all over the UK for Sid to do his magic. I spent 5 years under his tutorage and still only knew a fraction of the black art.

[rose5691]

You are welcome to tinker with mine any time    

[Blatman]

Black art? I disagree with that totally, BUT I will qualify that by adding that with a rolling road, diagnostics and jet swaps are not the guessing game of the past, but a scientific process of assessment and rectification. Even progression can be spotted, plotted, diagnosed and rectified on a rolling road.

[Norman Verona]

no rolling roads in 1961, not where I worked anyway.

[Blatman]

Precisely. It was all about ears and eyes back then, hence the belief that carbs are a black art, a belief that perpetuates to today despite the fact that we have very accurate and accessible tools and engineers who can deliver the goods...

[markcoopers]

I think the general concensus is that technology from 30years ago is less applicable in todays modern engines, Zetec included in that sweeping statement. By todays standards any splutter/hesitation would be noticed and therefore seen as an issue when in truth you may already be at the optimal point.

carbs are i think widely regarded as a fantastic compomise to all conditions rather than the perfect solution to all conditions.

By all means continue with the wizzardry/skilled diagnostics as your enthusiasum is refreshing, but perhaps you should just get it on a RR and then drive, learn and enjoy it?

[rose5691]

I have been to 3 places, all with different, conflicting opinions. For instance, the idle screw affects idle only-the jury seems to be out on this one with all 3.

I get fed up throwing money at it when none of them thought it necessary to actually drive it on the road. RRs are obviously good but surely you cant actually assess things properly unless you actually go driving.

Still looking for someone near me who fancies a challenge one afternoon  

[Norman Verona]

The point about a rolling road is that is will give the same condtions in terms of engine load as experienced on the road. Connect the car to a good analizer and you will see the fueling at the whole spectrum of conditions. You will then be in a position to get the nearest jet (or drill one to get it perfect) for these conditions.

Unlike computer controlled fuel injection carbs will never be perfect across the whole range.

Blatman, getting 3 webers, let alone 2 correct without a rolling road and only a crude gas analizer is a black art. Now add the complication of having the workshop about 100 yards from Piccadilly (the London one). It comes down to 10% knowledge and 90% experience.

[RJD]

This is worth reading if anyone is completely stumped.

DCOE Info

[rose5691]

cheers

[Blatman]

Blatman, getting 3 webers, let alone 2 correct without a rolling road and only a crude gas analizer is a black art.

WAS a black art, BUT with a gas analyser, it's a bit less of a guessing game, although a sniffer that old probably won't be responding quickly enough and the throttle control won't be accurate enough either. A rolling road has no such variables. Anyone trying to get 2 or 3  or how ever many carbs going today WITHOUT a rolling road is foolish and destined to spend many many hours and lots and lots of money chasing their tails and getting frustrated with a poorly performing car when a rolling road with a good operator can get the job done and dusted in just two or three hours.

RRs are obviously good but surely you cant actually assess things properly unless you actually go driving

You obviously have no idea of what or how a roling road works. As Norm has said, a rolling road simulates driving, but more than that, it gives the operator control over the car at any throttle opening in any gear. It removes the variable of foot movement for throttle control 'cos the operator can vary the load on the rollers to stabilise the conditions. A rolling road will also place a 5 wire Lambda up the exhaust for real time gas analysis of the exhaust, and he will watch the revs, fuel and probably torque curves live on screen to see what is happening right across the rev range. Once a run is done, changes can be made then measured *very* accurately to see if improvements have been made. It usually takes several runs to get everything going well, but trust me, compared to what you have suffered so far, this is the cheap and easy way to getting the car running as sweetly as is possible in the shortest time and with the least amount of aggro.

Still looking for someone near me who fancies a challenge one afternoon

Where are you? If you're in striking distance of Northampton, go see Troy at Northampton Motorsport. He'll sort it no question...

[Norman Verona]

Blatters, but setting up triple webers on Astons in the late 50s early 60s without modern technology was done and it did take all day (or more) but we did it.

[V8grunt]

On the "Twink" ( Escort Twin Cam, twin 40 webers ) I used to shove a tube in the ear and turn the air screw until you could just hear it start to hiss....    

Can't do that now....I would'nt even hear if the engine was running!    

[rose5691]

I was led to believe that the air bleeds screws are factory set and should be left alone. I was also told the idle mixture screw is just for idle and has no effect after as you are then using the jets only.....or am I wrong?

I get SO much conflicting advice and "facts", it's difficult to know which direction to go.....forward I hope