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  1. pre_engineer

    New Ring Update... Comments/Suggestions?

    Honda cr125 2 stroke piston ring gap .016" - .022" (max .026") piston ring groove clearance .002" - .003" I would not use anything smaller than .01" gap with water cooling, and .015" gap with air cooling minimum. Even if your temps are low. Theres little to gain and much to lose(seize) with...
  2. pre_engineer

    New Ring Update... Comments/Suggestions?

    I just looked through my factory service manuals, heres some info. honda S2000 F20C top ring gap 0.01" - 0.014" (max =.024") second ring gap 0.024" - 0.03" (max =.034") oil ring gap 0.008" - 0.028" (max =.031") piston ring groove clearances: top .0018" - .0035" (max =.005") second .0016" -...
  3. pre_engineer

    Oroville Dam Spillway Concrete Failure (Feather River Flooding, CA)

    when the dam was originally constructed I believe it was recommended that they had 50 foot pylons, but things changed as money was spent. On a more disturbing note during initial construction, "while pouring cement the earth was eroding away so much that a worker stopped and refused to keep...
  4. pre_engineer

    650cc motorbike dual cam timing - im lost

    Congratulations on getting the bike back together and running! I know this is a bit late, but in the past I have made a wood tool that locks the sprockets together. Method 1. Involves wedging or bolting a piece of wood between the sprockets so they're physically locked together and cannot...
  5. pre_engineer

    Oroville Dam Spillway Concrete Failure (Feather River Flooding, CA)

    Their fix is equivalent to a new coat of paint on a rotting sinking house. I doubt they fixed the damn shifting a few inches forward. It needed extra pylons sunk into the Bedrock when it was first made, and it still needs them. also the water seems to be getting caught on the cracks in the...
  6. pre_engineer

    Boeing 737 Max8 Aircraft Crashes and Investigations [Part 2]

    Bad engineering + bad management + lobbying/bribing politicians to get contracts = profit... Any good bean counter knows that profit comes first.
  7. pre_engineer

    Welding with a little bit of paint after grinding

    A good old stick/arc/SMAW welder will weld straight through the paint/rust easily. I'm glad at least some people know the health concerns... you're going to need less than $100. The mask that will actually protect from lead and mold and any, ANY other unknown particles is called: -3M 60926...
  8. pre_engineer

    What exactly is the phenomenon that occurs on a supercharged muscle car to make this sound at idle?

    Here's what's happening: as the RPM falls the intake manifold vaccumm drops(closer to 0 in-hg). When manifold vaccumm drops, the power valve opens up. When the power valve is open it adds fuel and richens the air fuel ratio. Rich AFR raises the RPM. As RPM rises, intake manifold vaccumm rises...

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