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An interesting upgrade for some older vehicles.
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<blockquote data-quote="swampratt" data-source="post: 3081387" data-attributes="member: 15054"><p>I read about installing the ford injectors into the dodge engines years ago ..</p><p>main reason to do so was increased MPG.</p><p>My father-in-law has an older 318 fuel injected dakota 2 wheel drive and the thing only gets 15 MPG.</p><p></p><p>he got it new from the factory .. it is still going strong today but that 15 to me suckes for a FI vehicle as small as that truck.</p><p>I tuned my 6000 lb E 150 with a 2 barrel carb and 302" engine to 17.6 MPG and that is pulling a little bayliner.</p><p></p><p>Not impressed with the MPG of many FI vehicles and I feel it comes down to the fuel not being atomized well.</p><p></p><p>Think about a warm bed of charcoals that you tried to light off for a second time.</p><p>No luck so you spray some charcoal starter onto it. </p><p></p><p>You see the fluid begin to evaporate and make this white fog.</p><p>That is the liquid fuel getting very atomized turning into a fog.</p><p></p><p>Now take a carburetor sitting on a cast iron intake and an engine temp of 195 degrees.</p><p>That iron intake will hold a lot of heat and the fuel must tumble through those rough runners.</p><p>Then into some Iron heads .</p><p></p><p>Yes i ported all my heads and i leave the surface texture very rough.. I also want to introduce swirl when I concentrate on porting .</p><p>Now there you have very atomized fuel droplets and really good MPG.</p><p></p><p>Remember the heavy 1/2 ton long beds. Buddy had one and it was getting like 8-12 MPG granny 4 speed in town driving 90% of the time.</p><p>He had the engine rebuilt thinking that was the issue..I told him it was not.</p><p></p><p>Quadrajet Carburetor and HEI ignition.</p><p>He gets it back and the MPG did not change.</p><p>He drove it a few weeks. </p><p></p><p>I went to his rescue and for free put the tune on it.</p><p>Now stock little GM cam and the engine did not have any porting or trick things going on.</p><p>I lowered the APT adjustment in the carb and pulled the vacuum advance off and dialed in 18 initial timing and 38 total all in by 2000 rpm.. lighter advance weight springs in the distributor.</p><p></p><p>He called me a couple weeks later and told me i would not believe the MPG it was getting.</p><p></p><p>I said is it 18. as that was what my other friends suburban was getting when I tuned it the same way.. yes a suburban.</p><p></p><p>My friend told me it was getting 21.5 MPG...WOW even I was impressed.</p><p></p><p>I have driven these newer 2013-2014 5.3 LS trucks and MPG sucks.</p><p>It must be the fuel is not atomizing.</p><p>I stuck my bayliner behind them and expect way worse. like in the 11-12 MPG area.</p><p></p><p>What gives??? My answer: when you demand more power those injectors dwell open longer and this creates a cooling effect from the extra fuel.</p><p>Aluminum heads do not help the situation. even less atomization than before.</p><p></p><p>Throttle body injection worked ok but the timing curves i feel limited some MPG.</p><p>Back in the late 80's i pulled many throttle bodies off vehicles and pulled the feed back distributors and installed old school distributors and stuck a carter AFB or a Q jet onto those engines.. every one picked up a bunch of power and a bunch of MPG.</p><p></p><p>But as we know power and MPG does not always play nice with the exhaust sniffer.</p><p>I have always felt the sniffer was wrong in the way they go about it.</p><p>I feel if you get more miles on the fuel being burned you must be putting out less pollutants.</p></blockquote><p></p>
[QUOTE="swampratt, post: 3081387, member: 15054"] I read about installing the ford injectors into the dodge engines years ago .. main reason to do so was increased MPG. My father-in-law has an older 318 fuel injected dakota 2 wheel drive and the thing only gets 15 MPG. he got it new from the factory .. it is still going strong today but that 15 to me suckes for a FI vehicle as small as that truck. I tuned my 6000 lb E 150 with a 2 barrel carb and 302" engine to 17.6 MPG and that is pulling a little bayliner. Not impressed with the MPG of many FI vehicles and I feel it comes down to the fuel not being atomized well. Think about a warm bed of charcoals that you tried to light off for a second time. No luck so you spray some charcoal starter onto it. You see the fluid begin to evaporate and make this white fog. That is the liquid fuel getting very atomized turning into a fog. Now take a carburetor sitting on a cast iron intake and an engine temp of 195 degrees. That iron intake will hold a lot of heat and the fuel must tumble through those rough runners. Then into some Iron heads . Yes i ported all my heads and i leave the surface texture very rough.. I also want to introduce swirl when I concentrate on porting . Now there you have very atomized fuel droplets and really good MPG. Remember the heavy 1/2 ton long beds. Buddy had one and it was getting like 8-12 MPG granny 4 speed in town driving 90% of the time. He had the engine rebuilt thinking that was the issue..I told him it was not. Quadrajet Carburetor and HEI ignition. He gets it back and the MPG did not change. He drove it a few weeks. I went to his rescue and for free put the tune on it. Now stock little GM cam and the engine did not have any porting or trick things going on. I lowered the APT adjustment in the carb and pulled the vacuum advance off and dialed in 18 initial timing and 38 total all in by 2000 rpm.. lighter advance weight springs in the distributor. He called me a couple weeks later and told me i would not believe the MPG it was getting. I said is it 18. as that was what my other friends suburban was getting when I tuned it the same way.. yes a suburban. My friend told me it was getting 21.5 MPG...WOW even I was impressed. I have driven these newer 2013-2014 5.3 LS trucks and MPG sucks. It must be the fuel is not atomizing. I stuck my bayliner behind them and expect way worse. like in the 11-12 MPG area. What gives??? My answer: when you demand more power those injectors dwell open longer and this creates a cooling effect from the extra fuel. Aluminum heads do not help the situation. even less atomization than before. Throttle body injection worked ok but the timing curves i feel limited some MPG. Back in the late 80's i pulled many throttle bodies off vehicles and pulled the feed back distributors and installed old school distributors and stuck a carter AFB or a Q jet onto those engines.. every one picked up a bunch of power and a bunch of MPG. But as we know power and MPG does not always play nice with the exhaust sniffer. I have always felt the sniffer was wrong in the way they go about it. I feel if you get more miles on the fuel being burned you must be putting out less pollutants. [/QUOTE]
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