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<blockquote data-quote="heepofajeep" data-source="post: 769416" data-attributes="member: 16329"><p>Alright, I am coming in pretty late to this thread, and I only skimmed through the pages... </p><p></p><p>I did the conversion to the 258 engine in my CJ. I took the time to do it right, recurved & upgraded the dist. Ran a impco 300 mixer, model E vaporizer, century electric lock-off valve. </p><p></p><p>The most important part of the conversion imho is the ignition. You really need to spend some time to tweak it to get the maximum power out of your rig. Remember you want to have all your advance in by about 3000 rpm = softer dist. springs. Also, you need more final advance = notching out the stop on the dist. that sets the overall advance. No need for Vacuum advance. </p><p></p><p>As for the performance, I noticed better throttle response & seat-of-the pants feel (bottom-end torque), but less overall HP. Gas mileage dropped from 18 (gasoline) to 14 (lpg) in regular driving conditions. I probably could have squeezed a bit more out, as I kind of gave up on tuning the ignition to an extent. </p><p></p><p>As far as someone mentioning that LPG is lighter than gasoline, you are correct, but you are forgetting the tank! IMHO weight is a major concern with LPG because the pressure-rated tank weighs much more than a gasoline tank of twice its size. Also, with lpg, you are stuck with only a few shapes & sizes tank. I owned, but never used in the cj, a 30 gal tank, and that thing weighed well over 100lbs (empty), just to illustrate the point...</p><p></p><p>One thing that one of the guys at suburban propane mentioned (they were VERY helpful for me) is that inline motors do not do as well as V motors. I don't know why this is, but after reading a lot of writeups throughout the web, and noting mileage & power for vehicles before & after converting, I tend to agree. This might have to do with the mixer, or flow properties of the intake runner, I don't know, and this is just heresay anyhow. But you will notice on POR that the *most* of the guys with lpg in their Yotas mention the fuel mileage decrease, whereas *most* of the guys with chevy 350s (as a V example), noticed no mileage change... Take it for what its worth, that is just my observation. </p><p></p><p>As far as the final result? I really liked it for off-road. However, I don't think I would do it again for a dd (like my CJ). I ended up running dual fuel on my CJ, which I was VERY happy with. I also noticed gasoline ran much better after having tuned the CJ's ignition for the propane (mainly because I made it so there was a much hotter spark). Propane is just too big a pain to buy for a DD... No running to the store at midnight & expecting to fill up, etc. Also, the price varies wildly from place to place, so there is really only a few places I opted to fill up at. </p><p></p><p>FWIW, if you want to check out the CJ, I will be selling it on Ebay in two weeks, lol. </p><p></p><p></p><p>I just sold my 225 mixer on Ebay for $50. Ebay is by far the best place to get your parts. Ktsomethingorother on Ebay from Canada is always selling complete junkyard conversions (that's who I got mine from). </p><p></p><p>Alright, that is probably enough for now. Have to go take a Mech. Eng. Design final now :censored:</p></blockquote><p></p>
[QUOTE="heepofajeep, post: 769416, member: 16329"] Alright, I am coming in pretty late to this thread, and I only skimmed through the pages... I did the conversion to the 258 engine in my CJ. I took the time to do it right, recurved & upgraded the dist. Ran a impco 300 mixer, model E vaporizer, century electric lock-off valve. The most important part of the conversion imho is the ignition. You really need to spend some time to tweak it to get the maximum power out of your rig. Remember you want to have all your advance in by about 3000 rpm = softer dist. springs. Also, you need more final advance = notching out the stop on the dist. that sets the overall advance. No need for Vacuum advance. As for the performance, I noticed better throttle response & seat-of-the pants feel (bottom-end torque), but less overall HP. Gas mileage dropped from 18 (gasoline) to 14 (lpg) in regular driving conditions. I probably could have squeezed a bit more out, as I kind of gave up on tuning the ignition to an extent. As far as someone mentioning that LPG is lighter than gasoline, you are correct, but you are forgetting the tank! IMHO weight is a major concern with LPG because the pressure-rated tank weighs much more than a gasoline tank of twice its size. Also, with lpg, you are stuck with only a few shapes & sizes tank. I owned, but never used in the cj, a 30 gal tank, and that thing weighed well over 100lbs (empty), just to illustrate the point... One thing that one of the guys at suburban propane mentioned (they were VERY helpful for me) is that inline motors do not do as well as V motors. I don't know why this is, but after reading a lot of writeups throughout the web, and noting mileage & power for vehicles before & after converting, I tend to agree. This might have to do with the mixer, or flow properties of the intake runner, I don't know, and this is just heresay anyhow. But you will notice on POR that the *most* of the guys with lpg in their Yotas mention the fuel mileage decrease, whereas *most* of the guys with chevy 350s (as a V example), noticed no mileage change... Take it for what its worth, that is just my observation. As far as the final result? I really liked it for off-road. However, I don't think I would do it again for a dd (like my CJ). I ended up running dual fuel on my CJ, which I was VERY happy with. I also noticed gasoline ran much better after having tuned the CJ's ignition for the propane (mainly because I made it so there was a much hotter spark). Propane is just too big a pain to buy for a DD... No running to the store at midnight & expecting to fill up, etc. Also, the price varies wildly from place to place, so there is really only a few places I opted to fill up at. FWIW, if you want to check out the CJ, I will be selling it on Ebay in two weeks, lol. I just sold my 225 mixer on Ebay for $50. Ebay is by far the best place to get your parts. Ktsomethingorother on Ebay from Canada is always selling complete junkyard conversions (that's who I got mine from). Alright, that is probably enough for now. Have to go take a Mech. Eng. Design final now :censored: [/QUOTE]
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