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| NickG:
Tim, you will get there - it's easy to forget things like clearances when your making these models. Model engineering drawings are never toleranced so parts have to be 'fitted' together with the correct allowances - this project will certainly help you do that in the future. Nick |
| kvom:
--- Quote ---the crankwebs are binding with the con-rods once each rotation --- End quote --- That sounds to me as if the journals and shafts are not precisely parallel. If you do want more clearance between the webs it might be better/easier to narrow the conrod ends. |
| spuddevans:
--- Quote from: kvom on March 15, 2010, 11:15:01 AM ---That sounds to me as if the journals and shafts are not precisely parallel. If you do want more clearance between the webs it might be better/easier to narrow the conrod ends. --- End quote --- Ding ding ding ding ding!!! We have a winner!!!!!!!!!!! When fiddling with it today I noticed just that the crankshaft/webs/shafts/ect were not totally in line. After making a new piston valve ( for the other valve ) and re-assembling everything, re-timing it all and making sure that everything was in line, and ( tempting fate ) I also reattached the fw/rev speed control valve and hooked up the air. This time the "Ffffffffffffffffffffffsssssssssssssssssssssssssssssssss" was a little less and with a little encouragement it turned over a few times, by this time the little air-brush compressors tank had been depleted and the pressure dropped below 20psi and the engine stopped. By closing off the speed valve I was able to build up enough pressure to have a few more rotations. I think that the speed control valve needs some attention, I think that is where I am losing most of my air, I haven't put an O-ring in there yet, so that will be the 1st attempt at a fix, then if that doesnt cure it I'll have to remake the spool. Tim |
| NickG:
Nice 1 Tim, nearly there :ddb: |
| CrewCab:
Sounds like a bloomin' steep learning curve Tim, but well done for the methodical approach and sorting it ............. the old adage of "If it ain't broke, don't fix it" applies I'm sure .............. Good luck I'm sure it will be running as sweet as a nut in a day or two :dremel: CC |
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