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  • Users: JOHNDOE333
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  1. JOHNDOE333

    adding friction modifiers to motor oil

    Hello all, I have become aware of the removal of some elements from motor oils to help reduce emissions. The elements such as zinc and magnanese have seemed to help flat tappet to cam lobe wear in pushrod engines, particularly in high spring pressure racing engines. Does anyone know if it...
  2. JOHNDOE333

    Magnesium in piston alloys

    I saw a show the other day about the inventor of the compressed air powered car. The show stated he worked for a forumla one team for a number of years as an internal engine components engineer. They said he was know for first using magnesium in piston contruction to get piston weight in these...
  3. JOHNDOE333

    booster location inside venturi

    Hello all, Any thoughts on the ideal booster location inside a venturi on a carburetor with regards to fuel exit hole, booster top or bottom. Basically, what I am trying to figure out is what are the pros and cons of straight leg booster versus a "down leg" where the booster sits lower inside...
  4. JOHNDOE333

    measuring valve guide i.d. with digital dial bore gauge.

    Hello all, The facility that I work at requires valve guide wear to be measured before and after engine testing is performed. One of my co-workers does this procedure and using a digital dial bore gauge with a seperate but wired button to snap shot the reading onto a computer for proper...
  5. JOHNDOE333

    Pre-emulsion bleed formulas

    Hello all, I am curious if anyone has any formulas or knowledge pertaining to pre-emulsion bleed selection on Holley 4150 and 4500 HP series carbs. I am attempting to develope a starting point based on carb size, displacement, rpm range, and general application. Then my plan is to fine tune...

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