Jerry Posted January 17, 2013 Share Posted January 17, 2013 Just a random thought. Seems almost all 4.0L & 2.5L motor problems I read in the tech section, mine included, are related to sensor this or sensor that. I was thinking wouldn't life be simpler with a well set up carb? Link to comment Share on other sites More sharing options...
jimoshel Posted January 17, 2013 Share Posted January 17, 2013 YES!! With qualifications. Link to comment Share on other sites More sharing options...
Jerry Posted January 17, 2013 Author Share Posted January 17, 2013 Do tell ... :) Edit: thought you'd tried it sir, but now I'm thinking you're just in agreement that life would be simpler :D Link to comment Share on other sites More sharing options...
Pete M Posted January 18, 2013 Share Posted January 18, 2013 you couldn't pay me to go to a carb. we have some of the simplest FI setups out there with only a few sensors to worry about. and with a multimeter and a printout, you can diagnose your troubles. we have OLD trucks. not a thing wrong with FI setups as long as you upkeep them. same as a carb. Link to comment Share on other sites More sharing options...
mvusse Posted January 18, 2013 Share Posted January 18, 2013 The angles I find myself on when off road a carburetor would not stand a chance. Heck, even with a 1/2 tank of gas I stalled it out once because the pump was sucking air. Link to comment Share on other sites More sharing options...
cruiser54 Posted January 18, 2013 Share Posted January 18, 2013 you couldn't pay me to go to a carb. we have some of the simplest FI setups out there with only a few sensors to worry about. and with a multimeter and a printout, you can diagnose your troubles. we have OLD trucks. not a thing wrong with FI setups as long as you upkeep them. same as a carb. I agree wholeheartedly. Link to comment Share on other sites More sharing options...
Jerry Posted January 18, 2013 Author Share Posted January 18, 2013 So the conclusion is ... While more complicated, the injection system's benefits are worth it. Must say, I hadn't considered climb angles! But I do very much notice the difference in how my 4.0L with its injection system doesn't lose power when altitude in the mountains is a factor compared to the 2.8L with its carb. That gets very out of breath climbing through high elevation passes! Link to comment Share on other sites More sharing options...
jimoshel Posted January 18, 2013 Share Posted January 18, 2013 No way would I trade a good working FI system for a carb. Just saying they were simpler. Link to comment Share on other sites More sharing options...
Pete M Posted January 18, 2013 Share Posted January 18, 2013 "simpler" is a relative thing. the carb trades wires and sensors for jets and tiny linkages. just gotta pick your poison. Link to comment Share on other sites More sharing options...
Eagle Posted January 18, 2013 Share Posted January 18, 2013 you couldn't pay me to go to a carb. we have some of the simplest FI setups out there with only a few sensors to worry about. and with a multimeter and a printout, you can diagnose your troubles. we have OLD trucks. not a thing wrong with FI setups as long as you upkeep them. same as a carb. I once had a 1947 Hudson pickup with a failed fuel pump ... and a carburetor. I was able to drive it several miles to get home by putting gasoline in a tin can with a barbed fitting in the bottom, and connecting that to the carb inlet with a length of rubber fuel line hose. Hung the can from a threaded rod under the hood and I was on the road. Try that with electronic, multiport fuel injection. Link to comment Share on other sites More sharing options...
Eagle Posted January 18, 2013 Share Posted January 18, 2013 So the conclusion is ... While more complicated, the injection system's benefits are worth it. Must say, I hadn't considered climb angles! But I do very much notice the difference in how my 4.0L with its injection system doesn't lose power when altitude in the mountains is a factor compared to the 2.8L with its carb. That gets very out of breath climbing through high elevation passes! That's just the difference between a 2.8L and a 4.0L. The loss of power at altitude is a direct result of the loss of atmospheric pressure. Remember, no internal combustion engine can create compression pressure -- it just multiplies whatever is out there by the compression ratio. The closer the ambient gets to zero ... well, do the math. Zero times 100 is still zero. Want to know just how much difference altitude and atmospheric pressure make? In 1968, electric wipers were still an option on many cars. My 1968 Javelin had vacuum wipers. It also had the high-performance 343 c.i.d. V8, which in the day was a VERY fast engine (and mine ran better than most). I drove it across the country once, and one of my stops was Pike's Peak. It was very foggy and cool that day. The base elevation at Colorado Springs is around 7,000 feet and the summit is about 14,000. My wipers were very lazy at the base. By around 9,000 or 10,000 feet they just stopped working. Completely. Wouldn't even think about starting to give a twitch. Once I got off the mountain and back to around 6,000 feet they were fine, and they lasted as long as I had the car, which was another ten years or so. Don't ignore basic Physics. Link to comment Share on other sites More sharing options...
Pete M Posted January 18, 2013 Share Posted January 18, 2013 few years ago I watched a rally car end its race with the co-driver sitting on the engine bay spraying a starter fluid can into the intake hose to keep the engine going. where there's a will, there's a way. :D Link to comment Share on other sites More sharing options...
Minuit Posted January 18, 2013 Share Posted January 18, 2013 few years ago I watched a rally car end its race with the co-driver sitting on the engine bay spraying a starter fluid can into the intake hose to keep the engine going. where there's a will, there's a way. :D :rotf: That's brilliant. How did it place? Carbed 4.0 IMO isn't worth it. The injection system is simple by modern standards and it's only really a couple of different things that can cause trouble. Link to comment Share on other sites More sharing options...
jimoshel Posted January 19, 2013 Share Posted January 19, 2013 I once had a 1947 Hudson pickup with a failed fuel pump ... and a carburetor. I was able to drive it several miles to get home by putting gasoline in a tin can with a barbed fitting in the bottom, and connecting that to the carb inlet with a length of rubber fuel line hose. Hung the can from a threaded rod under the hood and I was on the road. Try that with electronic, multiport fuel injection. Almost did the same thing with a '34 chevy I had. Me and my buddy and lil bro had been out chasing and shooting coyotes The Chevy quit. Quick inspection showed no gas to carb. No tools. Over 5 miles back to house. Filled a Pepsi bottle with gas and buddy sat on right hand fender dribbling gas into the carb . Just got to the edge of town when the cops stopped us. After explaining to him what was going on and pointing out only had 2 blocks to get home he said OK. As he was walking back to his car he was chuckling and muttering something ' about dern kids.' Link to comment Share on other sites More sharing options...
mountainman Posted January 19, 2013 Share Posted January 19, 2013 Being a carb builder and tuner myself i absolutely LOVE carbs. BUT they were replaced by injection for a reason. They just can't provide the proper mixture to the engine under all circumstances. I have been building and wheeling 50s vw buses for 20 years roughly and the biggest issue is climbing steep hills. The carbs overflow out the vent and bogs the engine and your screwed halfway up the hill. It sucks but you learn how to drive around the issue. You can add vent extensions and do many mods to the carb but its still a pita in off camber situations. So yeah as wonderful as the injection is on these jeeps.. i wouldnt change a thing. Link to comment Share on other sites More sharing options...
Pete M Posted January 19, 2013 Share Posted January 19, 2013 :rotf: That's brilliant. How did it place? don't remember. they only had like a quarter mile or less to the finish line of that stage when the fuel pump died. Link to comment Share on other sites More sharing options...
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