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Propane High HP Question
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<blockquote data-quote="Naughty_Finger" data-source="post: 355681" data-attributes="member: 8026"><p>Maybe I can be of help. I was torn between efi and propane. Kept hearing that propane can support x horsepower.. I believe it was 350 on a single carb .. Well I built a Mopar 400 and ran propane on it. I purchased my propane kit from gotpropane.com. when I dyno' the motor it was a dog. 320 horse and 410 torque. I messed with the timing and that was the best. When I ran it on gas it was 415 HP... The problem is that the propane carb is only 425 cfm. Its not the amount of fuel, its the lack of air that choke the motor. Even with a duel carb setup it was still wasn't much better. Propane is great for smaller engines but if you go over 300hp don't go propane. I am not an expert but one of my clients is. In fact he is the only guy in nhra that drag races a propane fueled car. To get power with propane you need multiple carbs, multiple evaporators, remove a black restrictor from the carbs, and have two bottles because it sucks gas. If you want to ask him questions his name is Richard. Information is free. His website is propane carbs dot com. As far as timing goes, its not total timing that matters so much as the advance curve. Propane likes all in really early. Hope that helps. </p><p></p><p>I sold my propane setup and put a fast efi on my truck. Huge noticeable difference.</p></blockquote><p></p>
[QUOTE="Naughty_Finger, post: 355681, member: 8026"] Maybe I can be of help. I was torn between efi and propane. Kept hearing that propane can support x horsepower.. I believe it was 350 on a single carb .. Well I built a Mopar 400 and ran propane on it. I purchased my propane kit from gotpropane.com. when I dyno' the motor it was a dog. 320 horse and 410 torque. I messed with the timing and that was the best. When I ran it on gas it was 415 HP... The problem is that the propane carb is only 425 cfm. Its not the amount of fuel, its the lack of air that choke the motor. Even with a duel carb setup it was still wasn't much better. Propane is great for smaller engines but if you go over 300hp don't go propane. I am not an expert but one of my clients is. In fact he is the only guy in nhra that drag races a propane fueled car. To get power with propane you need multiple carbs, multiple evaporators, remove a black restrictor from the carbs, and have two bottles because it sucks gas. If you want to ask him questions his name is Richard. Information is free. His website is propane carbs dot com. As far as timing goes, its not total timing that matters so much as the advance curve. Propane likes all in really early. Hope that helps. I sold my propane setup and put a fast efi on my truck. Huge noticeable difference. [/QUOTE]
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