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The carbs on my TR3 were replaced at some time. What is the purpose of the "vent" nipple coming directly out of the carb body? The previous owner ran a hose from one to the other. Is this to balance air flow? Pollution? Necessary?
Though at least the placement on yours seems like it might get at real vacuum.
The TR3 manifold has a pretty big balance tube connecting 1&2 and 3&4 so that puny hose isn't going to have much effect.
I suppose one possibility is that someone thought they were learning something by attaching a vac gauge at that spot and the tube was just a way of closing off both fittings. Yeah, far-fetched.
The carbs are hS6s (from the emission control era) and the nipple connections are for crankcase ventilation. I use the same carbs on my 6 and the hoses run to a nipple on the valve cover. On a 3, just plug the nipples and use the road draft tube. Berry
You confirmed my suspicions. These carbs have the float bowl connected directly to the body. Mine were not tight and were weeping fuel.
Do you have a site, pic, article, ?, that addresses these late model SU's?
The same carbs, SU HS6s (minus the crankcase vent nipples) were used on TR4a, so all of specs should be the same. Check out the Moss catalog for detailed pics. Make sure the float bowls are level (north-to south) as the carbs are used on many applications are adapters are used according to the angle of the manifold. The only way the float bowl can leak is where the jet attaches at the bottom or at the lid gasket. There is no opening where the float attaches to the carb body. Berry
The only way the float bowl can leak is where the jet attaches at the bottom or at the lid gasket. There is no opening where the float attaches to the carb body.
Darrell-Very true. I have found that a -008 o ring makes a good substitute for the seal and is available locally. I meant that the loose float bowl attachment bolt would not cause a leak. See you at the Montgomery Park swap meet Sun.? Berry
The only way the float bowl can leak is where the jet attaches at the bottom or at the lid gasket. There is no opening where the float attaches to the carb body. Berry
You're so right. I see now that the weeping was coming from the bottom of the bowl. Jumped to a conclusion when I saw traces of gas that driped down on my heat shield.
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