DLTX Carbs

[HWRC]

Does anyone know where I can find the air restriction measurements for the different DLTX carburetors? I have the choke and throttle opening measurements.

 

[RandyB(MI)]

You will probably have to invest in the flow equipment and calculate any restriction and then remove he "restrictive" venturi and add fuel injector ( and all it's controls) since it will no longer suck fuel up from the nozzle. Keep in mind the 2cyl, firing sequence of fire / 180 / fire / 540 /fire/180----.Also decide what rpm ( cfm ) your engine needs to determine whether any perceived restriction is even an issue. Cam/valve size is the restriction.

 

[forty40]

(quoted from post at 12:57:06 09/15/15)
Does anyone know where I can find the air restriction measurements for the DLTX carburetors? I h the choke and throttle opening measurements.

If you are looking for DLTX 71 bore diameters that work well a venturi bored to 1.400, throttle end 1.800 (new throttle plate), and open the choke end to 1.900, removed choke, plugged shaft holes, just hold something over the end to choke. Runs evenly from idle right on up to WOT on both 400 cu-in and 645 cu-in. Used those numbers so the throttle plate wouldn't break out and it looked like it should still have signal to draw fuel. Did another one with only a 1.350 dia venturi, runs good at idle and WOT, rough in transition, thought it would be better, wasn't. Made lexan plates for a flow bench, never got around to setting it up, I'm not really a carburetor person anyway, luck helped. Working on a Duplex now, std bores by calculation flow 50% more than a worked over DLTX 71, time will tell.

 

[HWRC]

My apologies to the fellows who responded. My wording was obviously not very clear, but I'm flattered by someone thinking I'm smart enough to measure air flow! I'm looking for the venturi constriction measurement for each of the DLTX carbs. I have a box full of stripped carbs that I can't identify from the stamping. I can ID some of them by the throat/choke measurements and whether they have an economizer plug or not, but not all of them. Thanks!!