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ChadS
02-26-2005 07:38:17
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Re: Need help building a pulling carb in reply to nerstrand44h, 02-25-2005 19:11:10
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what rpm rnage? and how much compression? what type of fuel are you going to run? W9's dont run much different than the H-450's on how the carb is built, just dont go overboard with the venturi size. If it has the bigger venturi, Like the IH 6's, its pretty much straight through, hardly any hourglass shape in the center,,,, take it out, and go back to the original venturi. The big huge venturi used in the 6cyl, in the 4 cyl IH engines dont agree with each other, they breathe differently, too big of venturi, and it will pull a bit lazy, torque is slower to catch on, HP and torque are lower than what they should be. Id say keep the throttle body from the denny's carb, and then use a carb bowl from a M-450, or W9 if you still have it, Use a 450 venturi, or the W9. After that, you need to see if the jets in the carb are big enough to make the engine run rich,, by turning ou tthe main load adjustment screw. if you can, just set it to where it is kinda smooth at high rpms, but will smoke just a hint when you crack the throttle, if not,,, Take any M-450 carb bowl, go to the hardware, to the drill bit section, and find the drill bit that fits inside the main jet, that will tell you existing jet size, then you should buy 3-6 bits larger than your current bit size. Id start out at 3 sizes larger, and then there is a brass metering stem in the center o the carb bowl,, there is 3 sets of holes along the side of the stem, using the same 3 sizes bigger bit, drill out the bottom 2 holes in the metering stem. blow out the shavings, and retry to make the engine run rich. if it still does not, try the next size larger drill bit in the main jet,, BUT, dont re drill the metering stem!! a little goes a long ways on the metering stem holes!! Hope this info helps, if you need any more info, just ask! ChadS
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