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Got bad gas mileage? I got a solution.

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by BLzr4x4ngkid, Jan 30, 2001.

  1. BLzr4x4ngkid

    BLzr4x4ngkid 1/2 ton status

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    I just topped off my truck this morning and I checked the gas mileage. I am currently getting about 17mpg. I bet you guys think that I'm just blowing smoke up your butts, but I'm not. For the past week I have been running 100LL from our gas trucks at my work. 100LL(low lead) is used in piston engine aircraft and a couple of the guys that I work with told me to put like 10 gallons in and it will clean out the system. Low and behold, it did. So last week I filled the tank with 100LL and this morning when I was at work, I checked the gas mileage because I filled it again. 17mpg!! Part of the reason why I can pull this off is because I work 3rd shift and I also was taught how to work around the meter readings........just do it through the sump drain. Uhhh yeah, sometime next week I'm having a fuel drive, so if any of you want to stop by, feel free too!! HAHAHA jk. Later guys.

    p.s. The only downside to this fuel is the lead. I will have to change the fuel filter sooner than normal. It was definately worth getting the system cleaned though.

    "Don't hit me with them negative waves so early in the morning." Odd Ball--Kelly's Hereos
     
  2. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    The reason air planes still run lead is the lubrication it provides to the valves and rings. The reasons auto's no longer do is emmisions. The cat cannot handle the lead so when your replacing that fuel filter you can throw in $200's worth of cat. When your truck starts making that pressure washer hissing sound out the tail pipe it's your plugged cat. and the reason your getting such better gas millage is the lead has coated the O2 sensor and giving false readings. The reason it isn't pinging is the 100 octane. wait till you go back to pump gas.

    Diging it in the dirt with my K5's
    Grim-Reaper
    <A target="_blank" HREF=http://grimsk5s.coloradok5.com/>http://grimsk5s.coloradok5.com/</A>
     
  3. TX Mudder

    TX Mudder 1/2 ton status

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    I was with you all the way till I hit your profile and see you have an 88.
    Man, you're killing your cat. And messing up your o2 sensors. Like the other guy side, you'll have some problems when you switch back to even 93 octane.
    If you had an older truck like me (73) I'd say so for it. I ran some av gas for awhile, just because it was free. But it sucks resetting the timing for either avgas or pump gas or a mix. I just run 87 now
    -- Mike
     
  4. dyeager535

    dyeager535 1 ton status Premium Member

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    Theres a guy on the 73-87 GM truck mailing list I am on getting 17mpg+ with a 454/Th400 Quadrajet carb combo, on regular unleaded (87 octane) pump gas. Its all in the tuning. I was getting 17mpg out of my '83 Blazer (305, Q-jet, 700R4, 3.08's, 135,000 miles+) after I made sure everything was running right. No need to get all exotic trying to get extra good gas mileage. If you want that, get a Geo or something. If you want performance and power, get TPI.



    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://yeagerd.home.mindspring.com/index2.html>http://yeagerd.home.mindspring.com/index2.html</A>
     
  5. Blaze

    Blaze 1/2 ton status

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    I just thought you guys might like to know this - I was reading an article the other day about a guy who made a carb with a heater in the venturi. It heated the fuel before it mixed with the air. It made over 50 mpg on a V8. He invented it while in the military during World War II. He was in the tank crew under General Patton in Africa. The Germans chased the Americans into the desert, the Americans running low on Ammunition. He rigged up the American Tanks with this system. The Germans all drove into the desert, but ran out of gas while the Americans were able to drive out of the desert with gas to spare. Has anybody heard this before? It seems very interesting to me.

    [​IMG]<A target="_blank" HREF=http://www4.ncsu.edu/~brschoch>http://www4.ncsu.edu/~brschoch</A>
     
  6. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Were'nt all tanks deisel? Injected to boot? Sounds like someone fed you a nice campfire story![​IMG] Just like all this BS about 200 mpg carbs that always shows up when gas prices go up. I've seen the plans for one, looks like a big recipe for vapor lock.
    Fine tuning and good maintenance combined with good driving will get you the optimum gas mileage for your vehicle.

    Rene

    [​IMG]
     
  7. Blaze

    Blaze 1/2 ton status

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    I don't know if they were diesel or not, you are probably right. I read it in a Hot Rod a few months ago. Was a little skeptical too, but hey, it sounds good!

    [​IMG]<A target="_blank" HREF=http://www4.ncsu.edu/~brschoch>http://www4.ncsu.edu/~brschoch</A>
     
  8. 6.2Blazer

    6.2Blazer 1/2 ton status

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    Was his name MacGyver??? Sounds pretty hokey to me.
     
  9. dyeager535

    dyeager535 1 ton status Premium Member

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    Pretty sure the tanks back then were gas. They used Cadillac transmissions, not sure about the engines though. I've heard the story myself, never seen the actual account in print. Theres someone else now playing with the idea of heating the gas (atomizing I believe) just before "injection" into the motor. Will run damn near on anything, but haven't seen any MPG or HP ratings on it yet.

    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://yeagerd.home.mindspring.com/index2.html>http://yeagerd.home.mindspring.com/index2.html</A>
     
  10. woodpecker

    woodpecker Registered Member

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    Not sure if it's plane luck or what, but I've got an '86, 305, Qjet, 3.73 diffs, 700r4, and 108K miles. I've got NO mods on the engine b/c I've got NO money. Right now I'm getting 16.8 mpg, which is damn near 17 w/o any tricks like a/v fuel or heated venturis.
     
  11. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    I ran across a web site on this about 6 months ago. I typed in "200 mpg Carburator" into my seach engine. From the sites I saw no-one was very successful in getting the damn thing to run decently and improve mileage. The one guy had been beating his against a wall trying to get better mileage out of a metro. With gasoline he got a best of 52 MPG and on this weird set up he was getting less. [​IMG] Interesting reading.

    Rene

    [​IMG]
     
  12. Josh

    Josh Registered Member

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    There is a guy here in Phoenix that has made an engine that runs on just about anything (don't think he had tried cat pee though) He runs the "fuel" through the head and behind the valve seats. The fuel is pre-heated that way and then vapors much easier. The intake valve opens and uncovers the fuel port , the valve seat also happens to be a good place to put fuel in the engine because of the speed/low pressure of the air and helps atomize it futher. But this is supposed to increase milage quite a bit, it's really not too new an idea because the rocket engines have been pre-heating the fuel since the beginning. This engine has even run on "coal slurry" Keep an eye out.

    Josh
     
  13. BLzr4x4ngkid

    BLzr4x4ngkid 1/2 ton status

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    Cat? Uhhh what cat? I don't have one, in fact I just got my dual exhaust put on today with 40 series Flowmasters. Now, can we say, HELL YEAH!! Oh yeah, the exhaust from the 100LL is killing me. Stinks like a &lt;&lt;beep&gt;&gt;!! Later

    "Don't hit me with them negative waves so early in the morning." Odd Ball--Kelly's Hereos
     
  14. redbeast

    redbeast Registered Member

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    Not real sure but I think avgas has a pretty high level of oxagen in it.. Im sure youve all seen the gas additive that you can put in your gas tank to fool the im240 emissions test.. I think its has the same propertys
     
  15. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    some guy made a VW bus run on vegtable oil and cooking grease. He used the preheat deal to make it work. He recently drove it across the US and was filling up at every greasy spoon he could. It was quite humorus. he did blow it up a few times.
    Down in Cuba since gas is so damn expensive the get the engines in their 55 chevy's fired and hot on gasoline and then sturt running Kyrosene and Deisel in them by preheating it to get it to explode at the lower combustion pressure. What causes the fuel to explode in a diesel is the heat generated by the extremely high combustion chamber presure. This is possible because Diesel fuel has an extremely high flash point. By preheating the diesel fuel they are getting it hot enough to explode at a lower combustion chamber pressure. Now my guess is thats what this guy did in WWII with the tanks. He probably ran it on Kyrosene or some other type of fuel oil or a mix with some gasoline to lower the flash point. It would not be very efficient as for as the amout of power it could produce.
    As for pre heating gasoline I got to call BS on that. It's the exact oposite of what it takes to make power. The cooler the fuel load the more dense and the biggest bang making the most power. Heating the fuel would be counter productive in a gas motor. It's the same as raising the compression to high. It would cause the fuel to explode too early resulting in detonation that would destroy the motor. Gas has to low of a flash point to run like a deisel engine thats why they run lower compression and use a spark to start the explosion.

    Diging it in the dirt with my K5's
    Grim-Reaper
    <A target="_blank" HREF=http://grimsk5s.coloradok5.com/>http://grimsk5s.coloradok5.com/</A>
     
  16. OhioJimmy

    OhioJimmy Registered Member

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    The old tanks and half-tracks and such were all gasoline powered, I was a mechanic in the army and voluntered some extra time to recondition old military vehicles for the museums. I have talked to alot of the old timers that said they could make flames come out the exhaust and some were pretty darn fast for their size.

    tree? what tree?
     
  17. Blaze

    Blaze 1/2 ton status

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    There's a guy in my home town of Rocky Mount that has a car he claims runs on a mixture of styrofoam and a little gas. There was a newpaper article on him and everything. One day my fiancee and I were driving around and we saw him pouring this huge tank of gas into his car. When he saw us he jumped in his car and sped off really fast. Kinda funny. I knew it was a bunch of BS.

    [​IMG]<A target="_blank" HREF=http://www4.ncsu.edu/~brschoch>http://www4.ncsu.edu/~brschoch</A>
     
  18. DMK

    DMK 1/2 ton status

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    My 89 got 16 mpg on 89 octane. Allied tanks in ww2 were gas powered. German tanks were also gas powered. Only the russians used diesal powered tanks. Also agree with others, plan on replacing cat and O2 sensor.
     
  19. dyeager535

    dyeager535 1 ton status Premium Member

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    What he ends up doing is atomizing the gas with the heat, and KEEPING it atomized all the way to combustion, which is harder when you have cold air, and long runner paths, with bends. I thought what you really wanted was cold air, not necessarily the fuel, especially since the air/fuel mix typically is so much skewed in the airs favor. Aren't the fuel coolers on drag race cars just to keep the fuel liquid until it can reach the carb? The tradeoff might be between the density with cold fuel, and the better atomization with preheating the fuel.

    In any case, the guy just preheated it so it could run on everything. That was the same guy that I saw, his next test was going to be running it on coal slurry. He had run it on diesel, gas, kerosene, not sure what else. But they didn't put ANY performance numbers in the article, just how he accomplished it, and how well it idled.




    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://yeagerd.home.mindspring.com/index2.html>http://yeagerd.home.mindspring.com/index2.html</A>
     

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