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Thread: What did you do to your Patrol today!

  1. #9831
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    PeeBee's Avatar
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    @mudski, you have me confused. Here is the initial assessment you made re the TD42 turbo airflow requirements
    'According to my book, air flow on this housing is 202 CFM, my air flow calculations for the stock N/a TD42 is 265CFM. Whack a turbo on it and it jumps to over 800', and then above
    'for a 16.5L V12 Genset. It ended up running two Donaldson "Powercore" housings, one per bank, which were rated circa 800cfm each'

    What I don't understand is how a 4.2 turbo engine requires say 800cfm and a 16.5L only requires 1600cfm? I am assuming the genset is running at a 'high idle speed and the TD42 at full snot? Curious to understand how you derive the flow ratings?
    Manufacturer of the Complete Camp Oven System

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  3. #9832
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    Quote Originally Posted by PeeBee View Post
    @mudski, you have me confused. Here is the initial assessment you made re the TD42 turbo airflow requirements
    'According to my book, air flow on this housing is 202 CFM, my air flow calculations for the stock N/a TD42 is 265CFM. Whack a turbo on it and it jumps to over 800', and then above
    'for a 16.5L V12 Genset. It ended up running two Donaldson "Powercore" housings, one per bank, which were rated circa 800cfm each'

    What I don't understand is how a 4.2 turbo engine requires say 800cfm and a 16.5L only requires 1600cfm? I am assuming the genset is running at a 'high idle speed and the TD42 at full snot? Curious to understand how you derive the flow ratings?
    This Genset's max rpm is only 1400 rpm. Not a lot. A TD42 is 4000. RPM is a big factor, more than engine size.

  4. #9833
    ......... MB's Avatar
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    It’s possibly already been created out there somewhere but I’m imagining a super helpful online calculator for this stuff would be worth subscribing/paying for nuffy’s like me
    I’m assuming a basic Algorithm thingy could be able to calculate engine volume versus rpm + forced induction of turbo/supercharger specifications.
    Imagining it would get quite mathematically tricky though calculating recently McGoogle read delivery piping/bends/distances and ambient temperatures/pressures/moistures added variances too




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  5. #9834
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    Quote Originally Posted by MB View Post
    It’s possibly already been created out there somewhere but I’m imagining a super helpful online calculator for this stuff would be worth subscribing/paying for nuffy’s like me
    I’m assuming a basic Algorithm thingy could be able to calculate engine volume versus rpm + forced induction of turbo/supercharger specifications.
    Imagining it would get quite mathematically tricky though calculating recently McGoogle read delivery piping/bends/distances and ambient temperatures/pressures/moistures added variances too




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    This is a pretty good website mate.
    https://www.widman.biz/English/
    Last edited by mudski; 2nd February 2021 at 10:11 PM. Reason: grammmaarrrr

  6. The Following 2 Users Say Thank You to mudski For This Useful Post:

    MB (2nd February 2021), Plasnart (2nd February 2021)

  7. #9835
    ......... MB's Avatar
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    Oh WOW, that’s got everything thanks Legend


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  8. #9836
    Patrol God nissannewby's Avatar
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    Yep. I assume mudski has access to some nice calculators for this stuff. But a td42 that will rev to 4000rpm ideally should have a minimum flow requirement of 800-900cfm.

    If the genset is a turbo diesel then it ideally requires a minimum of 1200cfm. This could change if its a gas powered genset though.

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    MB (2nd February 2021)

  10. #9837
    Patrol God nissannewby's Avatar
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    Quote Originally Posted by MB View Post
    Oh WOW, that’s got everything thanks Legend


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    Yes it is. I was typing my last reply while you guys had obviously already responded. Handy website. Thanks @mudski

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    MB (2nd February 2021), mudski (3rd February 2021)

  12. #9838
    Patrol God threedogs's Avatar
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    @rustynail good job on the welding its not easy
    welding something that is gal coated. You need
    to maybe grind the gal off first or burn it off when
    welding it. Again good job
    04 ST 3lt auto, not enough Mods to keep me happy, but getting there

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  14. #9839
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    What's this talk about TD reving to 4000 business. Lol
    I thought they just slapped the revometer under the dash and forgot to blank out lines after 3200...
    No way in hell will mine go past 3200 and that's even pushing it ...

    Sent from my Pixel 3a XL using Tapatalk
    2005 TD42TI

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    MB (4th February 2021)

  16. #9840
    The 747 Winnie's Avatar
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    Quote Originally Posted by Hodge View Post
    What's this talk about TD reving to 4000 business. Lol
    I thought they just slapped the revometer under the dash and forgot to blank out lines after 3200...
    No way in hell will mine go past 3200 and that's even pushing it ...

    Sent from my Pixel 3a XL using Tapatalk
    Really? That's an issue mate as it should get to 4000 with no issues.

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    Hodge (3rd February 2021)

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