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  • Users: gsz
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  1. gsz

    ideas on rev limiter algorithm?

    i do NOT have "direct" control of the ignition, which is a PVL brand CDI. i plan on simply replicating the kill circuit by grounding the CDI box via a solid-state relay. when the daq system senses rpm above the max threshold, the relay closes and effectively kills the spark. when rpm falls below...
  2. gsz

    ideas on rev limiter algorithm?

    thanks for the feedback. the system is labview based (national instruments USB hardware connected to a laptop) and is completely custom so implementation of virtually ANYthing is possible. although i started out with closed loop speed control (rpm feedback was used to vary the water supply to...
  3. gsz

    ideas on rev limiter algorithm?

    I need a methodology to control max engine speed while testing small two-cycle engines on dyno. what i'm thinking is to kill the spark intermittently at a specified rpm (like a stutter box). questions are: 1) with a small two-cycle, carbureted engine is there a danger with turning the ignition...
  4. gsz

    Can I tune different Intake lengths with duration on a camshaft?

    I'm sure that VW has compensated for any runner length variations within the head (intake ports) by varying the lengths of the intake manifold runners accordingly. As far as having a custom cam ground so that the durations/timings match an un-equal length intake, sure it can be done but why...
  5. gsz

    looking for Spindt AFR calculation

    Thanks. Found it in my archives. (SAE paper 650507). In VB in looks like this: Function spindtAFR(O2percent, COpercent, CO2percent, HCppmC, HCratio) O2 = O2percent CO2 = CO2percent CO = COpercent HC = HCppmC q = O2 / CO2 r = CO / CO2 Fb = (CO2 + CO) / (CO2 + CO + (0.0001 * HC)) Fc = 12.01 /...
  6. gsz

    looking for Spindt AFR calculation

    Can anyone provide the equation for calculating air fuel ratio based on exhaust gas emissions (CO, CO2, HC, and O2)? Thanks much.

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