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Recent content by BobSP

  1. BobSP

    How to calculate valve spring requirements?

    So basically it is trial and error?
  2. BobSP

    How to calculate valve spring requirements?

    Hello everyone, I'd like some help to determine how strong the valve springs need to be for a given application. I know the easy way is just to look at manufactures recommendations for the camshafts, but if i want to actually know how much i need, how would i do that? If i know the mass of...
  3. BobSP

    Transmission power rating

    mfgenggear case harden
  4. BobSP

    Transmission power rating

    Thanks Steve and Terry. i don't have a specific design, i was looking into the possibility of making some modifications to increase power in a motorcycle transmission, that's why i wanted to know where's the limit. Also, anyone knows what steel grade is used for the gears?
  5. BobSP

    Transmission power rating

    thanks for the answers Greg, i mean manual.
  6. BobSP

    Transmission power rating

    I'd like to know more about gearbox power rating... How much power can a gearbox handle? What are the causes of failure? If a gearbox can take 100hp, then does that mean that: a) it can take half the torque at twice the RPM? b) it can take twice the torque at half the RPM? in other words, is...
  7. BobSP

    Aluminum block thermal expansion

    Thanks everyone
  8. BobSP

    Aluminum block thermal expansion

    dicer, that's not my main concern, ehat im worried about is the possibility of increased stress on the crankshaft or block.
  9. BobSP

    Aluminum block thermal expansion

    Thanks Pat and ivymike, my question was regarding expansion along the axis, not radial. Pat's answer i what i was imagining, there's enough clearance to allow small movement between bearings and journals.
  10. BobSP

    Aluminum block thermal expansion

    Hello everyone, i'm trying to figure out if there are any problems with thermal expansion of an aluminum block regarding the crankshaft. As the block heats and expands, the main bearings should move (stretch) more than the journals, putting some lateral pressure. Is that correct? Is there any...
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