Two turbo questions

Discussion in 'Engines' started by tomo pauk, Sep 27, 2011.

  1. tomo pauk

    tomo pauk Creator of Interesting Threads

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    Perhaps someone could provide a good information about:
    -XF6F-2; powered by R-2600 with Birmann turbocharger: would like to know more about that
    -P-38L: I've read that WEP rating was 1725HP - is that true?
     
  2. GregP

    GregP Well-Known Member

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    #2 GregP, Sep 27, 2011
    Last edited: Apr 30, 2012
    One of my best friends is Joe Yancey, who builds Allison V-1710's today. The -111 / -113 did, indeed, produce 1,725 HP and can produce more if boosted.

    In fact, Joe can and HAS made Allison V-1710 engines that can produce more than 2,500 HP. But in the war, they were not over 1,850 HP in stock form until the G-seies engines that were real performers at 2,200+ HP, but lacked reliability due to teething problems. Today, you can build a reliable Allison 1710 G-series engine but, alas, the market is low ... and nobody seems to want to race one. Joe has a Reno engine configuration that can produce 2,900+ HP to the prop, but no takers.

    Too bad, his engines are built right and last a LONG time if run properly. He has several out there flying with over 1,100+ hours on them. Wartime overhaul was 250 - 350 hours, depending on condition.
     
  3. wuzak

    wuzak Well-Known Member

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    According to Whitney, Vees for Victory the P-38L ws rated to 1600hp WER on 100/130 fuel and 1725hp WER at 3200rpm using 150 grade fuel.
     
  4. GregP

    GregP Well-Known Member

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    Hi Wuzak,

    You are correct and I should have specified WEP.

    Most WWII V-2 engines that could produce 1,400+ HP were almost never un at that power unless in combat. They took off, cruised, and landed at greatly reduced pwoer. They typically went to WEP only in combat when really scared.

    An Allison V-1710-111 was probably run at take off at 1,100 HP or so, cruised at 750 - 900 HP, and was used at 1,600 - 1,750 HP when scared or trying to pursue a potential victim that was trying desperately to get away. Landing, it was probably run at 450 HP in the pattern unless trying to climb.

    In the war, Merlins were run the same ... at greatly reduced pwoer settings unless the power was needed RIGHT NOW. Ditto for raidals, but they were typically cruised at 45 - 55% power instead of 65 - 75%. A Bearcat was usually cruised at under 200 mph unless higher speed was required for the mission.
     
  5. tomo pauk

    tomo pauk Creator of Interesting Threads

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    Thanks for the input, fellas :)

    Perhaps someone could provide some info about that curious Birmann turbo?
     
  6. tomo pauk

    tomo pauk Creator of Interesting Threads

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    A further question: was P-38 ever equipped with ADI system for it's 1710's, either experimentally, or operationally?
     
  7. GregP

    GregP Well-Known Member

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    As to the P-38 having ADI, the answer is yes. The P-38K had water-alcohol ADI that took the F-series -75 engines from 1,425HP in miitary power to 1,600 HP at War Emergency Power (WEP).

    Most of the G-series engines also had ADI. If you look up the Allison and see a power level as "wet," that means ADI injection. "Dry" means no ADI.
     
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