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propane tech?
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<blockquote data-quote="altfuel1991" data-source="post: 208889" data-attributes="member: 1211"><p>Several questions come to mind. </p><p>Are all the parts new?</p><p>What about the throttle plate? Has it been checked to make sure it is flat? It sounds like a vacuum problem. I have seen it numerous times with used mixers that will start when cold but not start when hot due to metal expansion. </p><p></p><p>You definitely need to be using a lockoff valve. The vacuum hose needs to be connected to port vacuum, not manifold vacuum. This means it should be connected to the mixer where there is always vacuum above the throttle blades. It takes about as much vacuum as drinking through a straw to open a vacuum lockoff valve. It also has a filter in it to clean the fuel passing through. I know there are guys not running lockoffs but you run a chance of the vaporizer leaking due to trash in the fuel. </p><p></p><p>We do have an electric "start" valve that will prime the engine. Most of the time we only have to use those on engines with a dual mixer and vaporizer setup because of the large plenum or if the engine has a really large cam.</p><p></p><p>Also, propane is a high octane fuel but forget what you know about race gas when setting up a propane engine. The two have completely different burn rates. You do not need more than 30 degrees total timing(base and centrifugal) and all of it in by 2500 rpm. </p><p></p><p>If you want you can give me a call and we will figure it out and post the solution online.</p><p></p><p></p><p> </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: 208889, member: 1211"] Several questions come to mind. Are all the parts new? What about the throttle plate? Has it been checked to make sure it is flat? It sounds like a vacuum problem. I have seen it numerous times with used mixers that will start when cold but not start when hot due to metal expansion. You definitely need to be using a lockoff valve. The vacuum hose needs to be connected to port vacuum, not manifold vacuum. This means it should be connected to the mixer where there is always vacuum above the throttle blades. It takes about as much vacuum as drinking through a straw to open a vacuum lockoff valve. It also has a filter in it to clean the fuel passing through. I know there are guys not running lockoffs but you run a chance of the vaporizer leaking due to trash in the fuel. We do have an electric "start" valve that will prime the engine. Most of the time we only have to use those on engines with a dual mixer and vaporizer setup because of the large plenum or if the engine has a really large cam. Also, propane is a high octane fuel but forget what you know about race gas when setting up a propane engine. The two have completely different burn rates. You do not need more than 30 degrees total timing(base and centrifugal) and all of it in by 2500 rpm. If you want you can give me a call and we will figure it out and post the solution online. 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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