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Recent content by comnean

  1. comnean

    Crankshaft material choice for durability

    Hy, For durability FCD 600 is used by most of engine makers (cast iron and huge serial production). Mechanical best results can be applied with precision forged steel alloy cranckshafts.
  2. comnean

    Transient Fueling Control on Port Throttled Bosch K Jetronic

    Hello, I have a lot of experience with all K injection sistems. The best way to modify (maybe a compromise) the feeding regime is to use one frequency valve mounted on the return line and one custom made controller piloted by one Lambda sonde. The controller can be made also in analog structure...
  3. comnean

    "ported" vauum passages in Throttle Bodies

    Hy, My opinions: 1. Is very important to know, for each engine, that are flow conditions via intake ducts 2. Is very important to know, for each engine, which EFI sistem sensor function, calibration and (i.e. BOSCH, siemens others...),ECU maping and ... 3. the simply way is to copy the intake ducts.
  4. comnean

    What A:F ratio does engine start to run rough?

    Hy, I have some experence with LPG systems fitted on gasoline engine. Is very important to know that aprox. 1,3-1,4 l of liquid gas are equivalent with 1 normal fuel litre. (according caloric power of each). One other very important factor is temperature of gas in expansion time via the...
  5. comnean

    OHC valve lash adjuster bleeding?

    Hy, I have long time experience with two hydraulic lifters type. One is GM type (+rocker arm) and one is VW type (cams are contact directly with upper surface of lifters) For first case the low and the high oil pressure circuit are inside the lifter and in many case this are noisy if the engine...
  6. comnean

    Leakdown testing, ring suggestions?

    Hy, First I suggest to make a simple compression test: 1. Pull out all spark plugs 2. Temp. of oil arround 40 C 3. Pull out the main fuel pump relay 4. With appropiate compression gauge check pressure on each cylinder with throttle open at maximum untill the measured pressure are stabilised...
  7. comnean

    LENGTHMOOR molecules in oil aditives

    Hy, I want to know what are the LENGTHMOOR molecules from oil aditives.I know only that this formula is applied for military scopes.
  8. comnean

    Oil filtration

    Hy, Y thing that chemical transformation are verry important because at the day performance is possible to filter everything. But! chemical modification is ireversible and imposible to filter.In a engine big oxydation phenomena are present and a acid oil is harmfull for the engine (all...
  9. comnean

    Oil filtration

    Hy, I thing you have right Evelrod but I'm interresting in not suplimentar particles aditives. I know all described by You, but I' interrested by special molecular comportament. A few aditive makers have experince with a "spring" molecules models.I want to know about. The principle is...
  10. comnean

    Slave element IAC

    Hy, Blacksmith, No, is wrong, amplitude modulation have same effect that freq. modulation.In both case the problem is only capability of slave element. Important is the law described in the electronical part.I have experience with a big freq. range and I,m satisfied for a 40 Hz. freq.In case...
  11. comnean

    Slave element IAC

    Hy, Blacksmith Your opinion is the best but I need your opinion about driving mode of this. Is preferable to pilot this in variable freqv. or in variable amplitude.Majority of car makers prefere in frecv. modulation but I prefere variable amplitude mode because on my experience high freq...
  12. comnean

    Slave element IAC

    Hy, What type of IAC you consider be the best - a freqventie type or a step by step motor type. Sorry for english
  13. comnean

    Oil filtration

    Hy, Because the subject is verry interresting, what opinion we have about presurized separate oil tank (race or F1 technical solution) At my opinion to introduce this modification for a street car is verry expensive.Or what opinion we have about special liquids like DURA-LUBE or russian...
  14. comnean

    EPROM programing and languages

    Hy, Thanks for reponses. Is not a case to prepare a race car. I'm a biginner in electronical tunning. At first I realise with a friend (electronist eng.)a module for a K-Jetronic tunning. I'm fascinated by this injection system because this are more adaptive (like a carburettor). I'm a...
  15. comnean

    Oil filtration

    Hy, What you thing about a dual filtering priciple: centryfugal and full flow. My opinion is that is possible to make everything but only production cost is important. More, chemical degradation is verry important and harmfull for an engine. I'm not in accord with 10k.miles dead line for a...
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