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Carter WCD Experts Chime In! |
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FSJunkie
AMC Addicted Joined: Jan/09/2011 Location: Flagstaff, AZ Status: Offline Points: 4741 |
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A fuel level that is too high can certainly cause rich problems and flooding in turns.
The next question is why is the fuel level too high? The float could be set wrong, one of the float pontoons could have fuel in it causing it to sink, the needle might not be sealing, or the inlet seat might be leaking where it screws into the casting. Some carburetors just need their float set lower. 1/8" lower than spec should do it. That is a lot in carburetor world. If 1/8" fixes your problems, try raising it 1/16" to split the difference. It's best not to lower it any more than you must.
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1955 Packard
1966 Marlin 1972 Wagoneer 1973 Ambassador 1977 Hornet 1982 Concord D/L 1984 Eagle Limited |
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Stingray
AMC Fan Joined: Jun/03/2015 Location: Australia VIC Status: Offline Points: 28 |
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Thanks FSJunkie, After your suggestion, I did check the floats. (plunged into extremely hot water - no bubbles) I also installed a sight plug to verify levels not too high and needle n seat OK. Now after lowering the float level by 1/8" (I know that's a lot but wanted to see if any real difference), the stumbling on right turns has gone away. That's good news! It drives OK in all other respects. My next move is to run a tank of gas through it and measure gas mileage. I'll use a GPS speedo on my phone to get an accurate odometer. (the speedometer in the car is inacurate) My suspicion here is that the rich condition on deceleration could be a red herring, in that although it's rich there's so little fuel flowing it probably doesn't affect overall economy. I'll let you know how I go after I've used a tank of gas. Cheers, Joe
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Heavy 488
AMC Addicted Joined: Apr/27/2019 Location: In the Status: Offline Points: 3529 |
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Deceleration has high manifold vacuum against closed butterflies. The idle circuit is exposed and working hard to feed. pitfall of a carb.
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Trader
AMC Addicted Joined: May/15/2018 Location: Ontario Status: Offline Points: 6762 |
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Wouldn't worry too much about carburetor fuel feed on deceleration. The engine will lean out as only idle fuel flow is being supplied to the engine. Even EFI systems provide some fuel to ensure low noise and enough fuel to have ignition in the cylinder and not a backfire in the exhaust.
An example of an engine fuel system that does not provide fuel on deceleration is the Jake Brake on a truck. It's basically compressor exhaust noise and can be quite loud. Your also going to need to run or tune richer then the OEM specifications if burning ethanol fuel as it has less BTU and best burn of E10 is 14.2:1 AFR vs gasoline at 14.7:1 AFR. The mileage will also be approximately 10% lower then OEM specifications for gasoline due to the reduced BTU's.
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Stingray
AMC Fan Joined: Jun/03/2015 Location: Australia VIC Status: Offline Points: 28 |
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Hi Heavy 488, I agree with your thinking. I'll measure fuel economy next over a tank of gas and see where I'm at. Joe
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Stingray
AMC Fan Joined: Jun/03/2015 Location: Australia VIC Status: Offline Points: 28 |
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Thanks Trader, The exhaust gas analyser is showing rich on deceleration, 12:1, but I'm starting to think it may not be an issue. The fuel I'm using has no ethanol. Joe
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Stingray
AMC Fan Joined: Jun/03/2015 Location: Australia VIC Status: Offline Points: 28 |
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Hi All, I've been doing a little driving since my last post. A total of 105 miles (GPS checked) using 23.2 litres or 6.13 US gallons. The driving was mostly city driving with a little 50mph highway stuff. That translates to 17.2 mi;es per gallon. What do you think of this economy? (A reminder - 1996 American Rogue, 232 six with BW35 auto. Carter WCD two barrel.) Thanks for your thoughts. Joe
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mixed up
AMC Addicted Joined: Jun/16/2015 Location: Monroe mich Status: Online Points: 2157 |
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17 MPG is not bad in the city and a little high way back in the 70s dad would get about 20 21 mpg out of the old 232 in the ramblers .I feel your looking to deep in the quest for fuel mileage just drive the car and after a few tank check the plugs and see what color they come out mean time just log the odometer reading and fuel on every fill up and check your average .believe me if there was a way to squeeze mileage out of a car dad would do it driving habit has a lot to do with it .coast more to stop signs ,ease into the throttle try running a mid grade in it
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69 amx 290 auto
65 220 290 4spd 80 ford fairmont |
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Stingray
AMC Fan Joined: Jun/03/2015 Location: Australia VIC Status: Offline Points: 28 |
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Hi Mixed Up, Thanks for your response. I will keep a log as you suggest. I am encouraged by your dad's experience and my mileage may well be acceptable. , Joe
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