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Tech & Fab
Propane engine builds (tech, questions, advice)
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<blockquote data-quote="TBItoy" data-source="post: 258305" data-attributes="member: 1384"><p>I've seen that quoted time and time again,</p><p></p><p>the CFM of a mixer is only an air flow restriction (an engine is just an air pump).</p><p></p><p>Horsepower is simply a calculation of power (rate that work is done)</p><p></p><p>HP = Torque * RPM / 5252</p><p></p><p>So, a "325HP" engine at 5200RPM would only be making 328 ft-lb of torque.</p><p></p><p>There are TONS of engines that make WAY more torque than that at 5200 rpm. </p><p></p><p></p><p>Saying that the 425 mixer (flowing 450CFM) will limit the RPM of an engine is accurate, saying that it limits the HP is inaccurate.</p><p></p><p>Like the old saying, "TORQUE IS WHAT MOVES VEHICLES, HORSEPOWER IS WHAT SELLS 'EM"</p><p></p><p></p><p>I say :flipper: horsepower, build for TORQUE (high compression, high cylinder pressures, good flow/high intake velocity, high scavenging effect) and let the HP fall where it is.</p><p></p><p></p><p></p><p></p><p>No disrespect to Buddy, or anyone that is in the propane business, but the math doesnt' support the "325HP" quote.</p><p></p><p>(hell, it may even help sell a few more single mixer simple kits if people knew they could get 400HP from it with a proper built engine)</p><p></p><p>Discuss</p><p> <img src="/styles/default/xenforo/smilies2/dblthumb2.gif" class="smilie" loading="lazy" alt=":dblthumb:" title="Dblthumb2 :dblthumb:" data-shortname=":dblthumb:" /></p></blockquote><p></p>
[QUOTE="TBItoy, post: 258305, member: 1384"] I've seen that quoted time and time again, the CFM of a mixer is only an air flow restriction (an engine is just an air pump). Horsepower is simply a calculation of power (rate that work is done) HP = Torque * RPM / 5252 So, a "325HP" engine at 5200RPM would only be making 328 ft-lb of torque. There are TONS of engines that make WAY more torque than that at 5200 rpm. Saying that the 425 mixer (flowing 450CFM) will limit the RPM of an engine is accurate, saying that it limits the HP is inaccurate. Like the old saying, "TORQUE IS WHAT MOVES VEHICLES, HORSEPOWER IS WHAT SELLS 'EM" I say :flipper: horsepower, build for TORQUE (high compression, high cylinder pressures, good flow/high intake velocity, high scavenging effect) and let the HP fall where it is. No disrespect to Buddy, or anyone that is in the propane business, but the math doesnt' support the "325HP" quote. (hell, it may even help sell a few more single mixer simple kits if people knew they could get 400HP from it with a proper built engine) Discuss :dblthumb: [/QUOTE]
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