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  1. kimbo1

    Injection Timing

    doesn't sound like an expert fix if that was the solution - more like a band aid!
  2. kimbo1

    Injection Timing

    For non-sequential firing (one injection every revolution) most cars I have tuned idle at about 2 ms, although the for different vehicles the range varies from 1-2.5 ms depending on injector size etc, the lower the time the harder it is to control the a/f ratio stability. Full load pulse width...
  3. kimbo1

    Super- and turbocharging - 'twincharging'

    OK I agree this is taking too much energy - but one last breath! The original question has been answered many times above,so this hijacking has not been wasted. the answer being - no there is no point twincharging. A lot of work and money for very little gain -the Lancia engineers seem to have...
  4. kimbo1

    Super- and turbocharging - 'twincharging'

    Neilroshier, It is obvious many who have had their say on this topic aren't end users - or the 50 year old theories would not be popping up constantly - no offence intended to anyone OK! we can all contribute in our own way. Your 2002 book must be quoting other 50 year old books, as turbo cars...
  5. kimbo1

    Super- and turbocharging - 'twincharging'

    I would give up aorangi, these people are obviously not listening and haven't driven cars with the latest turbo technology! fixed drive superchargers have poor and non-linear control of boost and are just not as efficient. Further more they are for low boost applications only, where they do...
  6. kimbo1

    Super- and turbocharging - 'twincharging'

    Neilroshier, My comments may not be directly answering your question, sorry, if I can add my two cents worth - you are thinking of ridding EVO VI technology for a supercharger?? Superchargers are generally low boost units - my understanding is that your turbo will crucify any supercharger you...
  7. kimbo1

    Super- and turbocharging - 'twincharging'

    If we were living in the 80's I would be trying to combine the two myself. But the 90's saw a massive leap in turbo design (spearheaded by Garret and Nissan) and even better in the 00's. Whilst the theory hasn't changed us mech engineers and materials guys have caught up. I wouldn't dream of...
  8. kimbo1

    Turbo/supercharged Volumetric Efficiency

    Marquis, You seem a little offended at my quest to keep things sane - I am sorry for your offence. You are correct the 80% VE I was referring to was from plenum - thus at pressure, and neglecting throttle plates. So yes, one could subtract another 1% off or so for these effects. My point was...
  9. kimbo1

    Roots Blower efficiency data

    In my limited knowledge of roots blowers i thought they were far inferior to turbocharging at boost above 10 psi or so? (not stirring anyone this is genuine question)does your class prohibit turbocharging?
  10. kimbo1

    Turbo/supercharged Volumetric Efficiency

    To answer the question, normal engines would see about 75-80% with the best legends proabably getting around 90% (unconfirmed) Marquis, i think you are getting a bit carried away - you don't refer VE at boost back to ambient it is then meaningless On a turbo engine the exhaust back pressure will...
  11. kimbo1

    PD vs Centrifugal pumps

    PCP = high efficiency - you have to be kidding!! - turn one by hand. I generally agree with most comments above, except that I amtrying to warn of the dangers of undersize pumps, which can be specified by suppliers, who will quote small pumps to win the job, then you will be changing rotors and...
  12. kimbo1

    PD vs Centrifugal pumps

    If you are pumping sludges you must consider the thixotropic nature of the sludge i.e the dynamic head is near on impossible to work out. An exception is EAS and WAS which we use flygt N pumps for) this is less of a problem with PD pumps which is why they are commonly used. There are no...
  13. kimbo1

    pump motor alignment

    Motor thermal growth should be available from the motor manufacturer We pump cold water with some 600 kW motors and have to align the motor low, but if you are pumping hot water then the pump will grow too. Worlds Best practice is an educated guess at first then re-align when the unit is hot...
  14. kimbo1

    Turbine and Compressor maps, where to find it?

    Turbine selection isn't as critical as compressors which is why you won't find many. They are efficient over a much broader range than a compressor.
  15. kimbo1

    subwoofers - lining

    Thanks Guys, I eventually made sense of it. The box is a reverberent room so I need to absorb as much sound as i can to minimise the amount of sound exiting out the port. Also there will apparantly be higher order harmonics generated which need to be absorbed. Anyway it worked out really well...
  16. kimbo1

    Bad/Silly practices and exploding Engine myths!

    To answer one of you, I have seen no gain from 4 prong spark plugs. 1 only spark, will jump to the shortest path anyway. they might last longer due to distributing the wear amongst the probes. As to comments on rod/stroke ratio - how can you possibly discount rod angularity and cylinder side...
  17. kimbo1

    propane for high performance

    Franz, you seem to know your stuff. i have done a lot of tuning on aftermarket computers and find almost universally engines seem to like 15 to 20 degrees at idle. My own runs 24 degrees and 30 total. I was wondering why why has this not caught on with the traditional tuners? I can run the...
  18. kimbo1

    DI Engines

    tomthorp, are you on orbital's payroll? I suspect there will be some servings of humble pie going around in the next year or two with so much DI bashing going on and some of the smartest engineers in the world from citroen puegot and mitsubishi working on this. for everyone else - Don't forget...
  19. kimbo1

    DI Engines

    ricktoo, Todays engines have about 30 % thermal efficiency (not 25%) and the combustion efficiency( what happens in the cylinder) is actually about 90% so you are a bit misled thinking mixing a liquid with a vapour is the problem. this is why I cannot understand the benefits claimed from a...
  20. kimbo1

    Dynamic Balancing at low speed. Will it work at running speed ?

    A couple of good answres above. Simply though, with a low balancing speed, the accuracy of the balance machines transducers becomes more critical as the out of balance force you are trying to measure is very small. As long as the machine is properly calibrated it will be fine.

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