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Thread: isuzu induction system

  1. 16th January 2012, 07:50 PM #11
    c.h.i.e.f's Avatar
    c.h.i.e.f
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    the way i have been thinking is that 4bd1t revs to 3000rpm (as a easy figure) say the 4bd1t is running over 20psi boost pressure it will use more air or "require" more air than a td5 that has a gt2052s which is a smaller turbo.
    i was thinking about a compound turboed cummins 6bt it may only run to 4000rpm but that secondary turbo will be sucking a considerable amount of air even compared to a motor that is reving to 6000rpm.
    although i do talk alot of crap
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  2. 16th January 2012, 08:13 PM #12
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    and to get the flow rate for a Turbo diesel the formula is roughly

    engine capacity+(engine capacity*boost PSI(g)/14.7)
    Dave

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  3. 16th January 2012, 09:19 PM #13
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    So if i put the correct figures in the formula the airflow required for a 4bd1t will always be greater than any other diesel rover motor even at same boost pressure.
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  4. 17th January 2012, 06:16 AM #14
    Dougal
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    For airflow vs boost.

    15psi is around 1.5 times the NA engine air consumption.
    20psi is around 1.6 times

    15psi with 60% intercooling is 1.75
    20pis with 60% intercooling is 2 times

    These numbers are on the conservative side. With a well matched and very efficient turbo you can do better, with more than 60% intercooling better again. But the returns diminish fast.
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  5. 20th January 2012, 02:04 PM #15
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    my airbox had 4" inlet and outlet, so i made up a 4" s/s snorkel, then 4" reducing to 3" for the turbo feed. 3" exhaust running behind the starter motor near firewall and in between the chassis rails as i had the winged sump and couldnt be bothered changing it.
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  6. 20th January 2012, 02:44 PM #16
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    Quote Originally Posted by Dougal View Post
    For airflow vs boost.

    15psi is around 1.5 times the NA engine air consumption.
    20psi is around 1.6 times

    15psi with 60% intercooling is 1.75
    20pis with 60% intercooling is 2 times

    These numbers are on the conservative side. With a well matched and very efficient turbo you can do better, with more than 60% intercooling better again. But the returns diminish fast.
    ok prove that for me.
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

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    Archaeoptersix 1990 6x6 dual cab(This things staying)


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  7. 20th January 2012, 03:00 PM #17
    Dougal
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    Quote Originally Posted by Blknight.aus View Post
    ok prove that for me.
    No.
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  8. 21st January 2012, 08:19 AM #18
    Bigbjorn
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    The Donaldson book gives the following formula for airflow with a naturally aspirated four stroke engine.

    (engine size in cubic inches x RPM/3456) x volumetric efficiency.

    Donaldson uses the following factors for volumetric efficiency-
    NA diesel = .9
    Turboed diesel = 1.6
    URSUSMAJOR
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  9. 26th February 2012, 11:11 AM #19
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    On a related issue i have done a bit of research on intake designing and an interesting fact i have found is that a rough surface flows better and has less resistance than a polished smooth intake....off to do some bead blasting now
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  10. 27th February 2012, 12:15 PM #20
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    Quote Originally Posted by c.h.i.e.f
    On a related issue i have done a bit of research on intake designing and an interesting fact i have found is that a rough surface flows better and has less resistance than a polished smooth intake....off to do some bead blasting now
    Wow, that is very counterintuitive.. source?
    Hercules: 1986 110 Isuzu 3.9 (4BD1-T)
    Brutus: 1969 109 ExMil 2a FFT (loved and lost)
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