CV Carbs
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But for fun, lets consider some strategies for measuring the slide position: 1. a "fish finder" type circuit (needs single digit microsecond accuracy at these distances) above the diaphragm to measure its position. 2. a cds/light source sandwiching a window with a tapered shaded area that moves up and down with the slide. 3. a variable inductor in the diaphragm (liking this one best so far) Any others? I suppose one could test the fuel flow rate at different slide positions on the bench and build a map from there. |
I think most people get a larger jet and exhaust when concerned about performance on cv carbs, don't they? I beleive most scooters use cv and they have a ton of aftermarket jetting kits and exhausts to get more air and fuel through to increase performance(but not economy of course). What kind of vehicle are we talking about here?
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So I received a map sensor from Coyotes old metro. And was thinking about tapping into the top of the CV carb (above the slide diaphragm, assume I wont interfere with the slide movement) and am having a little bit of trouble theorizing what it will detect if anything.
I want to think that it will be proportional to the needle position, assuming a strong enough signal, because it "looks" like it should work that way. The vacuum compresses the spring. The more the vacuum the higher the needle. I don't know if it will have enough pressure for good resolution though because it doesn't take much force to compress a cv spring and that diaphragm is pretty large. Any predictions? :) http://opengauge.org/cycle/cv.GIF 134 |
I too have CV carbs, My gas tank uses a vacuum release petcock to activate flow to carbs... There must be a vacumm outlet on at least one of your carbs in the set? Do you think it would be possible to figure out an estimated rate/flow of gas via vacuum gauge?
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Just a side note, CVs are from the devil.
Darn diaphrams are a pain. Be careful not to damage one or cause an air leak with the pressure tap. If one goes out the slide drops immediately leaning out that cly and burning a hole in the piston. Not fun going down I95 If you can, change to the round or flat slides. (CV?) You also can add a position indicator to them. As they are mechanical, any slide pot would work. Just my $0.02 /rant |
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