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  1. jminahan

    expand as it hardens - reverse shrink epoxy

    I'm doing some sand cast pattern making and I'm looking for something that I could pour over an existing part so that when it hardens it would expand instead of shink. The reason is that when you cast aluminum it shrinks, about 1.3% therefore your patterns need to be that much bigger. It follows...
  2. jminahan

    Do Bellmouths count towards the length of the runner?

    Wow steve! Thanx, The manifold I'm designing is going to be a compromise of several things anyway, but I feel more comfortable when I know what I'm compromising and what I'm not. jm
  3. jminahan

    Do Bellmouths count towards the length of the runner?

    Interesting Pat; however, as I understand the Blair article (It really is worth the read, only a couple pages), the bell mouth or trumpet works to *increase* the strength of the reflected pulse and ram tuning, not just steady state. He also gives a very detailed description of the "best" shape...
  4. jminahan

    Do Bellmouths count towards the length of the runner?

    If I may play devils advocate: We're sucking through the trumpet. Not blowing. No sound to sound like a trumpet. That also brings me to my next question: Should I put a set of bellmouths on the bottom of my carburetor going into my plenum? (assume chevy v8) The modern carbs are building them...
  5. jminahan

    Elliptical runners

    Nuther question for the propeller heads: Continuing with my last post and the Elliptical bell mouths as being optimal, could you just make the entire runner elliptical? This would create a "tapered" runner for the first half or so, then expand out. Also, it would act like a giant venturi...
  6. jminahan

    Do Bellmouths count towards the length of the runner?

    I've been reading books, talking to masters and I'm still confused. I wanted to get some opinions from the local propeller heads. Especially Pat. http://www.profblairandassociates.com/RET_Articles.html Good info for you guys if you haven't read up. Read the bellmouth article. The Bell mouth...
  7. jminahan

    Cast Steel Cranks

    My grandfather is a pattern maker for a local foundry in Grass Valley, ca and they cast almost exclusively 4130. Jason.
  8. jminahan

    engine balance textbook recommendation?

    Norton: Machine Design - Covers the basics on how much inertia you need to hold rpm withina given range, Norton: design of machinery (sequel to the first book) Gives much more detailed info on where to put it. The first book was the capstone for my mechanical engineering bachelors and the...
  9. jminahan

    Lowest BSFC question, stratified charge or not?

    Ehudson, I'm aware that most strat charge engines go homog charge at wot, but do you (or anybody else) have any idea if BSFC improves (even slightly) at wot when stratified? Regardless of power output. The main advantage of strat charge is pumping losses are waaay better but, you are running...
  10. jminahan

    Lowest BSFC question, stratified charge or not?

    Another question: Does stratified charge improve BSFC at WOT over homogeneous charge?
  11. jminahan

    Lowest BSFC question, stratified charge or not?

    How about all you dyno guys? What's the lowest number you've ever seen? Anybody read any articles or papers depicting < 0.35 bsfc's?
  12. jminahan

    Lowest BSFC question, stratified charge or not?

    Anybody know what the lowest bsfc ever achieved under any circumstances is? (gasoline) Strat Charge or not? GDI? Thnx, Jason

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