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Propane engine builds (tech, questions, advice)
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<blockquote data-quote="altfuel1991" data-source="post: 258227" data-attributes="member: 1211"><p>You have several good questions. I have been in the propane conversion business for over 21 years. We have engines with as much as 13-1 compression running propane. The info about having a cam with reduced overlap is great for building torque as well as useable hp. You need to make sure you have an adequate cooling system to handle the extra heat created by using propane vs gasoline. Gasoline tends to cool components down before being vaporized in the cylinder under compression where propane is already a vapor so you lose that cooling effect. The heads we have built use hardened seats and stainless steel valves on intake and exhaust. The intakes are usually the valves that deteriorate quicker because they are not made from a heat resistant material like the exhaust valves in standard engines. </p><p></p><p>A single mixer setup is good for about 325 hp@5200 rpm and on a 355 small block. The bigger the engine the lower the rpm. The photo is of one of our dual mixer setups on a 383 stroker that dynoed at 565 hp on propane. It had a flat torque curve of over 500 ft lbs starting at 1800 rpm and going up over 6500 rpm. The dynamic compression worked out to about 11.7 to 1 on this engine.</p><p></p><p>If I can help out give me a call.</p><p>Buddy Gamel</p><p>Precision Sales & Service, Inc.</p><p>451 64th Place South</p><p>Birmingham, Ala. 35212</p><p></p><p>877-403-7827</p><p>205-591-2266</p><p>205-591-2267, fax</p><p></p><p>bgamel@alternatefuel.com</p><p>bgamel@workhorseservice.com</p><p><a href="http://www.alternatefuel.com" target="_blank">www.alternatefuel.com</a></p><p><a href="http://www.workhorseservice.com" target="_blank">www.workhorseservice.com</a></p></blockquote><p></p>
[QUOTE="altfuel1991, post: 258227, member: 1211"] You have several good questions. I have been in the propane conversion business for over 21 years. We have engines with as much as 13-1 compression running propane. The info about having a cam with reduced overlap is great for building torque as well as useable hp. You need to make sure you have an adequate cooling system to handle the extra heat created by using propane vs gasoline. Gasoline tends to cool components down before being vaporized in the cylinder under compression where propane is already a vapor so you lose that cooling effect. The heads we have built use hardened seats and stainless steel valves on intake and exhaust. The intakes are usually the valves that deteriorate quicker because they are not made from a heat resistant material like the exhaust valves in standard engines. A single mixer setup is good for about 325 hp@5200 rpm and on a 355 small block. The bigger the engine the lower the rpm. The photo is of one of our dual mixer setups on a 383 stroker that dynoed at 565 hp on propane. It had a flat torque curve of over 500 ft lbs starting at 1800 rpm and going up over 6500 rpm. The dynamic compression worked out to about 11.7 to 1 on this engine. If I can help out give me a call. Buddy Gamel Precision Sales & Service, Inc. 451 64th Place South Birmingham, Ala. 35212 877-403-7827 205-591-2266 205-591-2267, fax bgamel@alternatefuel.com bgamel@workhorseservice.com [url=http://www.alternatefuel.com]www.alternatefuel.com[/url] [url=http://www.workhorseservice.com]www.workhorseservice.com[/url] [/QUOTE]
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