Even More Engine Troubles |
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garage gnome
Member Sponsor Member Joined: 12 Jan. 2011 Location: Western MA Status: Offline Points: 2834 |
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Scout, try very slowly, and I mean slowly, increasing the RPMs. It will die just above an idle. Or try holding it at a steady RPM just above an idle. I'll take a video and post it to show what I'm talking about.
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Nate
1953 3A, 1949 3A, 1947 2A, 1918 IHC Titan 10-20, 1905 IHC Famous, other hit n misses |
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scoutpilot
Member Joined: 30 Dec. 2008 Location: Asheboro, NC Status: Offline Points: 4373 |
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With the the understanding that every motor is different, and no two random WO's are exactly alike after 65 years of wear and corrosion, it should take only a small amount of adjustment of either the Idle Stop Screw and/or the Idle Mixture screw to raise the idle RPM just enough to clear any potential hesitation or stumble in a carb with no vacuum leaks.
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garage gnome
Member Sponsor Member Joined: 12 Jan. 2011 Location: Western MA Status: Offline Points: 2834 |
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We messed with all the adjustments and it would not go away. When we put my spare carb on, it fired right up and purred like a kitten with no change to any adjustments.
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Nate
1953 3A, 1949 3A, 1947 2A, 1918 IHC Titan 10-20, 1905 IHC Famous, other hit n misses |
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rrrrrrrrr9
Member Joined: 04 Apr. 2012 Location: western Mass Status: Offline Points: 424 |
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I have a video of the problem that I'll post when I get home this afternoon.
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rrrrrrrrr9
Member Joined: 04 Apr. 2012 Location: western Mass Status: Offline Points: 424 |
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Scoutpilot at 1:20 on the video you posted I hear and see the stumble, but you yanked the accelerator linkage before it died. In all of the videos you have posted of my carb you always yank on the accelerator, and never increase the throttle slowly. Look at my video again, at the end when the engine dies I haven't touched the ignition. The engine dies purely because the carb wouldn't supply enough gas for the engine to run. This, as best as Nate and I can figure, is because the vacuum drops to about 5 at that point with my carb so it doesn't pull any gas through the high-speed jet. With Nate's benchmark carb the engine pulled a steady 17 or so all throughout the rpm range, and the high-speed jet kicked in right where mine stumbles and dies. What you said about the vacuum dropping with the accelerator opened only applies at heavy load and wide open throttle, or when you stomp on the gas like in your video, not in the situation we tested where the rpm was increased very slowly. Pay close attention to the speed at which I increased the throttle.
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scoutpilot
Member Joined: 30 Dec. 2008 Location: Asheboro, NC Status: Offline Points: 4373 |
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Did you try driving it?
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rrrrrrrrr9
Member Joined: 04 Apr. 2012 Location: western Mass Status: Offline Points: 424 |
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yes, and starting from stops I had to floor it to keep it from dying, and offroad it was almost undriveable.
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scoutpilot
Member Joined: 30 Dec. 2008 Location: Asheboro, NC Status: Offline Points: 4373 |
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As my road test was a completely different experience, I will offer you a complete refund of the monies you spent with me.
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Carlsjeep
Member Joined: 15 Jan. 2011 Location: Taylorsville Ky Status: Offline Points: 2642 |
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Hmm, this is turning into an interesting problem.
Nate, did you try his carb on your Jeep?
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Life is only as good as you make it.
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11acs
Member Joined: 23 Aug. 2008 Location: mcminnville, or Status: Offline Points: 640 |
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Just out of interest, when the carburetors were swapped and the problem went away, was the gasket swapped also? Was the carburetor well seated?
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Victor
48 CJ2a 42 MB 45 CJ2a IH 1210 PU Interstate S-1a Cadet |
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rrrrrrrrr9
Member Joined: 04 Apr. 2012 Location: western Mass Status: Offline Points: 424 |
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same gasket, also the bad carb was pulling 20+ vacuum at idle on my engine,so there wasn't a vacuum leak.
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Clone421
Member Joined: 31 July 2011 Location: Delanco NJ Status: Offline Points: 410 |
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I'm no carburetor expert, but this is what I gleaned from reading the documentation on the Carter-WO carburetor.
http://mightymo.org/Proj_carter_wo_101.htm When the throttle plate cracks open just slightly above idle, thus uncovering the idle port, which the throttle plate is seated against when at idle, will supply additional fuel until the air velocity inside the venturi increases sufficiently to pull fuel through the high-speed circuit. If the port is blocked the air/fuel mixture will lean out until the throttle is open wide enough to increase the air velocity inside the venturi and pull fuel out the high-speed circuit. Have you tried testing the carb with the choke out? Edited by Clone421 - 24 Apr. 2014 at 12:19am |
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Kyle
1946 CJ-2A #21881 1950 Chevrolet Styleline Deluxe 1984 Honda VF750F |
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SlowPocono
Member Joined: 25 Feb. 2014 Location: NEPA Status: Offline Points: 346 |
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How about a stuck float from banging around during shipping?
And then, say that backwards when it's returned to the re-builder. |
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daddyo4
Member Joined: 28 Jan. 2014 Location: SW Indiana Status: Offline Points: 54 |
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So did you find the problem? Mine was rebuilt last year and has less than 100 miles on it and I'm having this same problem. Idles fine but won't run up through the rpm's unless you jerk the throttle open to get it into the high speed circut. I've blown out all the passages and jets and everthinges seems clear. Anxious to hear what you found.
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'46 #13480
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scoutpilot
Member Joined: 30 Dec. 2008 Location: Asheboro, NC Status: Offline Points: 4373 |
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Try raising the metering rod about 1/32".
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autolite
Member Joined: 15 Apr. 2006 Location: San Mateo, Cali Status: Offline Points: 788 |
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If your carb was rebuilt using one of those available repop 'master" kits, maybe the metering rod and or jet in the kit was not machined correctly. Just a thought. This is just my thinking, but if I had a spare that worked, I would remove each jet, one at a time from the bad carb and replace with jet from working one till hopefully, the culprit would reveal itself. Just a shade mechanic talking here.
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willys jeep
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stude-a-willys
Member Joined: 02 Sep. 2014 Location: Conifer, CO, US Status: Offline Points: 133 |
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My studebaker engine did this. It also had a lean surge at cruise (basically everything is different, but hold on a second here. Stay with me...) If I choked it a bit, it doesn't lean out and stumble on cracking the throttle.
Gotta idea on two variables from Scoutpilot's mule motor and yours. Fuel and Elevation. 10% Ethanol fuel vs non-ethanol fuel makes a difference in the way my bucket runs. It runs a bit leaner with ethanol in the fuel. Any chance you have ethanol fuel and scoutpilot has "non-ethanol" fuel? what about adjusting for altitude? Makes a difference up here at 8900'. Not sure that Scout's mule motor and your rig are at wildly different elevations, but maybe a factor. Edited by stude-a-willys - 14 Sep. 2015 at 6:10pm |
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Studebaker re-powered CJ2a
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Oilleaker1
Member Joined: 06 Sep. 2011 Location: Black Hills, SD Status: Online Points: 4406 |
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If it runs one Jeep, it should run yours too. You must have a fuel pressure/volume problem. Have you checked how much flow you have into a can or catch bottle? You can have pressure, but no volume. I just went through this with my M38. Drove me nuts like you are experiencing. John
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Green Disease, Jeeps, Old Iron!
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