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  • Users: NickB
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  1. NickB

    OHC valve lash adjuster bleeding?

    Does anyone know how hydraulic lash adjusters bleed the air out of themselves? The type i'm specifially asking about in this case reside in the head. The rocker arm sits between the lash adjuster and the valve stem, with the cam pushing down on it. Chrysler 2.2 and the Mitsubishi 4G63 are two...
  2. NickB

    Combustion chamber shapes (w/ pictures)

    Found a picture showing a Chrysler 2.2/2.5 head beside a Viper head, and surprisingly, there's not a whole lot different in the combustion chamber. The obvious difference is the shape of the shamber opposite the valves. Not so obvious is the valve angle. The valve stems on the 2.2 are about 5...
  3. NickB

    Leakdown testing, ring suggestions?

    What pressure do you usually start a leakdown test at, and how long do you let it sit before taking the second reading? I put pressure to the cylinders on my chrysler 2.2 turbo last night to see where i'm losing compression. Nothing came out the intake or exhaust valves, there was a small...
  4. NickB

    Flame propagation speed

    I'm trying to get a rough idea of the combustion speed inside a combustion chamber. Is there any number i can use as a rough estimate? I know it will be dependant on MANY things, including air/fuel ratio, type of fuel (pump gas in this case) octane rating, and chamber shapes. Does engine speed...
  5. NickB

    Oil and fuel filter micron ratings?

    Seems to me that the standard for aftermarket fuel filters is 10 microns, most oil filters are about 20, with the better oens also being 10 like the fuel filters. Am i totally off on this? Is there anything inherently different between the filter material used in the two different types other...
  6. NickB

    The intake worked out well!

    That intake i built using your help for the theory went on the engine about 10 days ago, and the engine went in a week ago. I've only been running at 5 psi for the week because i wasn't sure of how it would change airflow characteristics, and i didn't want to blow anything up from running too...
  7. NickB

    Oxygen Sensor transfer function?

    I'm trying to find data sheets or anything at all with a transfer curve relating lambda or air/fuel ratio to voltage output for a standard automotive type switching oxygen sensor. Any manufacturers datasheets on wideband UEGO sensors would be nice too. I'm working on a circuit to give a useable...
  8. NickB

    Chambers and detonation resistance

    I've come across only small bit of information that actually help explain how a combustion chamber is made more resistant or prone to detonation. I've heard that sharp edges can help promote detonation, as can mirror smooth chamber and piston surfaces. What can be done to try prevent detonation...
  9. NickB

    Another intake manifold question

    I'm in the process of modifying an intake manifold for a Chrysler 2.2 turbo, basically the only thing left the same is the runners, the plenum has come off (plenum roof was 3/4" from runner entry, and was a VERY odd shape, can't be good for flow), injectors have been repositioned sligthly...

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