FROM Bob G.
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Re: A China diesel that you can take to a Listeroid party!
« Reply #3 on: October 20, 2007, 10:32:38 PM »
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RCA:
been following your project, and finally got the audio file to work,, (kid and her myspace whacks out the puter)
some observations for what they are worth Smiley
1. i doubt seriously you will get a rubber/pin drive to live in this application, the shock loading is quite high
so if you want to use it, you probably need a very tough bushing
2. be sure and use a good quality straight weight oil, because as the engine is bringing that flywheel up to speed
the loading on the rod brg is going to be quite high.
3. the combination of difficulties in forming the hydraulic wedge at start up, along with the extreme loading
might cause significant longevity issues.
don't get me wrong,,, i understand what you are after,,but
from experience that hard knock that is heard is usually very short lived under normal circumstances
maybe a half dozen hard ones until it comes up to speed,, instead of dozens with the heavy flywheel.
some diesel engine's will destroy the rod brg, crack connecting rods, or break crankshafts from being lugged down
to under the designed parameters, who know's how much margin there is in a changfa style engine.
i am cautiously hopeful if not optimistic with this experiment, i just hope it doesn't cause costly damage.
perhaps a slack belt driven, jackshaft mounted flyweel would allow the engine some reduction in shock loading
on spin up,, i don't know.
something else to consider is the injection timeing in stock form is optimized for around 2500 plus rpm, not for
very low rpm, where the injection event is likely far too early resulting in excessive cylinder pressures.
if you can, you might look into slowing the injection timing a few degree's
you mention being on a tight budget,, i am not trying to rain on your parade,, only expressing a bit of caution.
perhaps after some testing you might pull the big end rod brg and inspect it for signs of stress?
interesting project overall though Smiley
bob g