On Sat, 21 Nov 2015 08:27:43 -0800, "Bob F"    
   wrote:   
      
   >clare@snyder.on.ca wrote:   
   >> On Sat, 21 Nov 2015 07:34:16 -0500, Vaughn Simon   
   >>  wrote:   
   >>   
   >>> On 11/21/2015 1:57 AM, clare@snyder.on.ca wrote:   
   >>>> I have a 7200/9000 watt Champion generator with a US Carb motor   
   >>>> snorkel conversion that is not putting out anywhere near full power   
   >>>> and is tricky to start. I suspect the pikot ajustment? is not   
   >>>> correct (the spring adjustment screw under the plug above the fuel   
   >>>> inlet on the Century zero regulator unit.   
   >>>> Anyone know the best way to determine the proper adjustment? I know   
   >>>> they are VERY fussy and turning the screw in makes it go lean. (more   
   >>>> intake vacuum required to open the valve)   
   >>>   
   >>> Hopefully someone will come along with more experience than I.  But I   
   >>> will try to get this conversation started   
   >>>   
   >>> You haven't mentioned trying the mixture adjustment, which should be   
   >>> separate from the adjustment on the zero regulator.   
   >>>   
   >>> Very basic, is fuel pressure.  You should find the specification with   
   >>> the conversion kit.  It is measured in inches of water.   You can   
   >>> buy a gauge, or make your own manometer from some clear tubing and a   
   >>> yardstick like I did.  You may find that your fuel pressure under   
   >>> load goes too low.  That could be anything from a simple fuel   
   >>> regulator adjustment, to the need for a larger (or more direct) fuel   
   >>> supply line.  There should   
   >>> be measurement ports for both the inlet and outlet of your zero   
   >>> regulator.   
   >>>   
   >>> I have had the same zero regulator since my ancient Onan was factory   
   >>> new, and don't remember ever adjusting it.  My mixture adjustment   
   >>> however, is another matter.   
   >>>   
   >>> Vaughn   
   >> The only "mixture adjustment" is the load block. Full range of   
   >> adjustment there only made things worse, not better, as far as power   
   >> output. The natural gas pressure is regulated by the utility - New   
   >> meter and regulator installed this summer - all to spec. Same problem   
   >> exists on Propane with regulator supplied by US Carburetor - and 2   
   >> regulators behave exactly the same.   
   >>   
   >> 2 identical generators with the same issue. Run fine on Gasoline. If   
   >> anything it acts like the generator is running too rich under full   
   >> load - it loads up and takes time to clear after the load is removed   
   >> (if I catch it before it dies)   
   >   
   >I seem to remember reading that dual fuel generators run on natural gas or   
   >propane do not produce as much power as on gasoline. That might be a subject   
   to   
   >research.   
   >   
   The magic number is something like 90% for dual/tri fuel systems.   
   Dedicated Propane/NG can actually produce MORE power if the engine is   
   specifically tuned and built - particularly with Propane due to it's   
   high AKI (octane over 100) of 115+   
      
    If i was only getting 90%, I'd be happy, I'm getting about 75% of   
   steady state, with only about 60-62% of peak.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)