Desperately seeking carb!

[NickApp]

Hi all, as I seem to have a choice of beautiful stable idle but stalling/stuttering if I open the throttle with my new Zenith 32IF7 carb OR perfect open throttle response but absolute refusal to idle off choke with the old Z 32If7 carb that came on the car, despite swapping of jets & much use of compressed air to clear passages etc, I'm now on the hunt for a 3rd carb to try!!

Anyone got one to sell?

Cheers
Nick

 

[harbourseal]

Nick, have you checked the hose that runs from the inlet manifold to the rocker cover. There should be a restriction in it.
What you discribe sounds like false air.
It makes it impossible to get a good idle.

 

[malcolm]

Can I buy one of the other carbs from you? I have most but not all of a 32IF and would like to complete it.

The vac hose to the manifold is a good point. Those carbs have an accerator pump needed for sudden throttle. Rebuild kits are available that include the theottle pump.

Ignition timing could also be an issue. Distributors wear and the advance curve can go out. Also the vacuum advance unit can fail causing that sort of trouble. Check it by removing the cap and seeing if the baseplate rotates when you suck the pipe.

 

[NickApp]

Nick, have you checked the hose that runs from the inlet manifold to the rocker cover. There should be a restriction in it.
What you discribe sounds like false air.
It makes it impossible to get a good idle.

The restrictor on my car is in the pipe that runs to the car rather than the inlet manifold.

Either way, by starting again & working through both carbs again I've managed to make one working carb out of the two.

Old carb is back on but with idle & main jet from the new carb & spent a couple of hours inhaling carb cleaner whilst I flushed the old carb each & every way I could!

Car now idles ok & revs up properly too.

Only odd thing is that the mixture screw is almost screwed all the way in rather than being 1.5 turns out. Idles nicely like that too which is different to other carb

 

[NickApp]

Can I buy one of the other carbs from you? I have most but not all of a 32IF and would like to complete it.

The vac hose to the manifold is a good point. Those carbs have an accerator pump needed for sudden throttle. Rebuild kits are available that include the theottle pump.

Ignition timing could also be an issue. Distributors wear and the advance curve can go out. Also the vacuum advance unit can fail causing that sort of trouble. Check it by removing the cap and seeing if the baseplate rotates when you suck the pipe.

Thanks Malcolm. I did check both timing & vacuum advance umpteen times & the vacuum advance does move the mechanism when you suck on he pipe & also can see it change the timing when using the strobe