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Tech & Fab
Propane engine builds (tech, questions, advice)
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<blockquote data-quote="TBItoy" data-source="post: 257505" data-attributes="member: 1384"><p>I've read a bunch of discussion about propane engines, cams, etc in some of the other threads about efi vs. propane.</p><p></p><p>Has anyone did a build, or compiled the info about building engines for propane?</p><p></p><p>Here are some things I've picked up: (feel free to add or correct me)</p><p></p><p>- propane is higher octane and can handle higher compression to pick up some lost power from the energy per volume of 'pane.</p><p> ? How much compression is too much? from a starting/reliablity</p><p></p><p>- decent vacuum at idle (less duration/overlap) helps with starting/idling (starting without having to prime the evap)</p><p> ? Do most people just pick a cam from the catalog, or the cam manufacturers have "propane" specific type cams?</p><p></p><p>-a single mixer/evap setup will only support <400 (maybe 350?) hp.</p><p> ? what is the commonly accepted HP limit of a single system? rpm per cubic inch limit? </p><p> - I assume you can run a single mixer on a larger cubic inch motor if you don't intend to spin it fast, or vice versa (small engine/high rpm)</p><p></p><p></p><p></p><p>I'm considering building a 351w for propane. I figure with the limitations of a single mixer system, there is no sense in building a stroker.</p></blockquote><p></p>
[QUOTE="TBItoy, post: 257505, member: 1384"] I've read a bunch of discussion about propane engines, cams, etc in some of the other threads about efi vs. propane. Has anyone did a build, or compiled the info about building engines for propane? Here are some things I've picked up: (feel free to add or correct me) - propane is higher octane and can handle higher compression to pick up some lost power from the energy per volume of 'pane. ? How much compression is too much? from a starting/reliablity - decent vacuum at idle (less duration/overlap) helps with starting/idling (starting without having to prime the evap) ? Do most people just pick a cam from the catalog, or the cam manufacturers have "propane" specific type cams? -a single mixer/evap setup will only support <400 (maybe 350?) hp. ? what is the commonly accepted HP limit of a single system? rpm per cubic inch limit? - I assume you can run a single mixer on a larger cubic inch motor if you don't intend to spin it fast, or vice versa (small engine/high rpm) I'm considering building a 351w for propane. I figure with the limitations of a single mixer system, there is no sense in building a stroker. [/QUOTE]
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