Topic: Air/Fuel Ratio Sleuthing

[mlinder]

thought about while at work, and came up with an answer to my own questions...but of course MReick had already posted it. seems like if you tap a port at the manifold before it splits to the two cylinders it will read the ame is it would at the carb, and get at least a good enough reading to set both carbs to the same idle. i still think the reading will probably jump up and down if there is any variance in the vacuums of the paired cylinders. only one way to find out, i guess..

Yub. Seems I could tap it, fit a nipple on each, solder them on, then close up the nipples (obviously) when I'm running.
Need a press drill now

[paulages]

i have a drill press in the shop, as well as taps and dies. you don't even need a nipple if you can match the thread of the manometer screws (anyone know what the pitch is in the stock carbs?). just tap the hole, and plug it with a screw when not being used, like on the stock carbs. if you don't want to risk drilling and tapping your manifold, you might be able to fit a plastic fitting into your rubber connectors. drill a hole, pop it in, silicone it, and have a cap that can go on it when you're not using it. i'll look for something that might work if i'm at the hardware or auto parts store.

[mlinder]

I can't think of a good reason not to tap it and make a good, airtight, permanent way to do some good vacuum tests on these. A tutorial might come in handy for other other people purchasing this carb setup.