Announcement Announcement Module
Collapse
No announcement yet.
which motor? Page Title Module
Move Remove Collapse
X
Conversation Detail Module
Collapse
  • Filter
  • Time
  • Show
Clear All
new posts

  • which motor?

    i'm real close to doing a v8 conversion on my 85 cj-7, but i'm torn between a couple completely different set ups. carburated 350 or 2002 5.3 vortec? with the carburated, it would obviously be easier to fix and install vs the fuel injected 5.3. what about a 350 with mpfi? i really need some suggestions because it will most likey become my new daily driver so i'm trying to make it as reliable and gas friendly as possible...but its got to be a v8 for sure cuz its my dream from years and years ago

  • #2
    If fuel injection is already an option, I'd go for it.

    Comment


    • #3
      I'd stay AMC, but if you have to go Chevy go with the 5.3 Vortec. Fuel injection is the best.

      Comment


      • #4
        crazy question

        5.3 is the right choice here. unless it is a used motor and has 150,000 miles on it. in that case rebuild it and still use it. you could buy that carb 350 several times over with $2.60 a gallon gas.

        Comment


        • #5
          HA!!! 2.60 a gallon? try 2.83 for reg. as of this mornning oh and i think the 5.3 would actually get really good gas mileage considering the jeep is so light and i could put a programmer and dual electric fans on it to eliminate the stock fan drag on the motor
          Last edited by quadracerJT; 08-31-2005, 02:39 PM. Reason: forgot something

          Comment


          • #6
            oh my apologies...........IT'S 2.90 NOW!!!!!

            Comment


            • #7
              Petroleum.

              I would wait until there's some stability in petro, granted it has up and down for a while now, before you do a swap.
              Seriously folks--If it goes to $3, I will be looking for a four banger.

              Comment


              • #8
                Not only a four banger, a diesel four banger that I can make my own fuel for at home! anybody see that episode of trucks!? need to figure up how many gallons you have to burn to recoup the cost of the machine. I could build it sure, but they have everything already done, and those tanks are not exactly cheap, though not too teribly expensive. I'd reather spend the time working on the jeep anyway.

                Comment


                • #9
                  with the shape my 258 is in, a v8 would be an improvement in gas mileage

                  Comment


                  • #10
                    Originally posted by 79cj7duner
                    Not only a four banger, a diesel four banger that I can make my own fuel for at home! anybody see that episode of trucks!? need to figure up how many gallons you have to burn to recoup the cost of the machine. I could build it sure, but they have everything already done, and those tanks are not exactly cheap, though not too teribly expensive. I'd reather spend the time working on the jeep anyway.
                    saw it and did the math...

                    the machine costs $3000. assuming I got the "oil" for free (and I am not sure how many places use pure vegi oil and if they are as willing to "give it away" as Stacey says). he claimed you could make the "bio-diesel" for about 70 cents a gallon. so assume $3.00/gallon for regular diesel. that means you save $2.30/gallon. so you would have to burn 1304.35 gallons to "break even". so at 20 gallons a week (for me) it would take me 65 weeks (or about 15 months).

                    now... you gotta already own a diesel car (or be willing to buy one) and if you don't already have one (like me) then it becomes a much more expensive task (although maybe could find a beater for cheap???). and it looked like it took him about 50 gallons (guessing at the size of the yellow tank he started with) to make about 20 gallons of good stuff. so now you gotta find enough "suppliers" so that you can get 50 gallons of vegi oil a week. also he had some "leftover" material that had to be disposed of (not sure where to take that stuff).

                    i like the idea... and the price is not bad... but the issues he glossed over i think raise some red flags. oh yeah... according to the website of the people that make the machine, it takes about 2 days to make the fuel... again... Stacey made it look quick... but as he said, there is only about an hour or two of actual "hands-on" time. but that means you gotta plan ahead to have fuel (get supplies and make it before you need it). otherwise you will find yourself at the pump anyway.

                    Comment


                    • #11
                      Theres a guy runnin around here with a Brand new 05 Ford truck running on mcdonalds fry oil, exhaust smells good too lol

                      Comment


                      • #12
                        Lots of good points there. I am thinkng about buying a comanche real cheap next summer and dropping a 4 cyl cummins in there. The "baby B" doesn't make tons of power like the "big B", so driveline strength is a non-issue. I would do it over the winter, but I have to rebuild the '7 first. The problem comes in the transmission, and mating to the baby b. It has a TH400 pattern, if it came from a frito truck, actually I think they all are the same. but I would need to adapt a GM engine to an AX-15 in essence. Maybe this ain't as bad as I think it's going to be. I'll have to do some good fabbing on the motor mounts, and not sure on the radiator either. there shouldn't be any reason it wouldn't fit in the engine compartment, they are big in size for a 4 cyl, but there is a decent amount of room between those fenders.

                        anyway, I would maybe do the used fryer oil thing, then supplement with pump fuel when I had to. I wonder if there's any problems making the stuff in winter? mabe it needs to be in heat somewhere. That would suck! You could possibly make it ahead of time and store it in a tank, but I would be concerned about algae (sp). A little fuel treatment should clear that up, but you never know. algae can ruin a tank of fuel in a hurry! Not that it would be expensive if it was homebrew, it would just be a lot of wasted work.

                        Comment


                        • #13
                          Talk about a thread hijacking!
                          It really comes down to how much you want to spend and how much time you want to spend getting it right. A carbed SBC can be swapped in overnight and for pennies compaired to a Multiport or 5.3.

                          Comment


                          • #14
                            Originally posted by MotorHead
                            Talk about a thread hijacking!
                            It really comes down to how much you want to spend and how much time you want to spend getting it right. A carbed SBC can be swapped in overnight and for pennies compaired to a Multiport or 5.3.

                            Another point would be that holley makes a bolt on tbi unit for the 350 (and the 258 too) so you could go with the fuel injection but still have the simplicity of the carb install.

                            Comment


                            • #15
                              i've got a line on a 2003 vortec 5300 w/ 34k miles on it out of a tahoe that go totaled in the rear, $2200 includes EVERYTHING i need to get it crunk, including the trannie..i think its a steal personally...and since it IS possible to do it, its gonna happen i've got all the time in the world to make it right

                              Comment

                              Working...
                              X