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Propane High HP Question
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<blockquote data-quote="altfuel1991" data-source="post: 356496" data-attributes="member: 1211"><p>Engine size and efficiency is the key factor in fuel consumption. Samurai rigs I have been around can run two to three weekends on a single 33lb bottle. A stock small block sometimes two days of riding and most of the big blocks I have seen or worked on would run about 4 hours depending on how high they wanted to fly or the amount of smoke desired coming off the tires. And nobody puts a "stock" big block in anything.</p><p></p><p>We install propane fuel injection on over the road vehicles. We use both vapor and liquid injection systems. The liquid systems are more complicated and would not easily be installed in an off road rig due to the tank having an electric fuel pump inside it like a gasoline system. You do need special injectors for propane no matter if vapor or liquid.</p><p></p><p>The weather related problem with ignitions being wet really can't be blamed on propane. It has more to do with lack of ventilation(or weather protection) for the distributor. I was at a 2 day XTERRA competition event a couple of years ago with the propane buggy that I show the photo of the 383 stroker. On Saturday the weather was warm and dry but on Sunday a cold front came in and the temperature dropped and the humidity in the air was about 90% that morning. Several of the fuel injected rigs had trouble loading up even after they warmed up. One crew member came running through the pit area asking if we had a scanner. We told him no, we didn't need one since we were running propane. Tim reached inside the cockpit and hit the switch and it fired off without incident.</p><p>The reason they had issues with fuel injection was because they did not use all the sensors needed for the pcm to recalculate for the weather change. With propane this 50 year old technology adjusts itself for the change in barometric pressure without wires or sensors.</p></blockquote><p></p>
[QUOTE="altfuel1991, post: 356496, member: 1211"] Engine size and efficiency is the key factor in fuel consumption. Samurai rigs I have been around can run two to three weekends on a single 33lb bottle. A stock small block sometimes two days of riding and most of the big blocks I have seen or worked on would run about 4 hours depending on how high they wanted to fly or the amount of smoke desired coming off the tires. And nobody puts a "stock" big block in anything. We install propane fuel injection on over the road vehicles. We use both vapor and liquid injection systems. The liquid systems are more complicated and would not easily be installed in an off road rig due to the tank having an electric fuel pump inside it like a gasoline system. You do need special injectors for propane no matter if vapor or liquid. The weather related problem with ignitions being wet really can't be blamed on propane. It has more to do with lack of ventilation(or weather protection) for the distributor. I was at a 2 day XTERRA competition event a couple of years ago with the propane buggy that I show the photo of the 383 stroker. On Saturday the weather was warm and dry but on Sunday a cold front came in and the temperature dropped and the humidity in the air was about 90% that morning. Several of the fuel injected rigs had trouble loading up even after they warmed up. One crew member came running through the pit area asking if we had a scanner. We told him no, we didn't need one since we were running propane. Tim reached inside the cockpit and hit the switch and it fired off without incident. The reason they had issues with fuel injection was because they did not use all the sensors needed for the pcm to recalculate for the weather change. With propane this 50 year old technology adjusts itself for the change in barometric pressure without wires or sensors. [/QUOTE]
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