re power

Discussion in 'Diesel Engines' started by bigmac25, Aug 15, 2012.

  1. bigmac25
    Joined: Aug 2012
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    Location: ireland

    bigmac25 New Member

    hi everyone im new to this site. i have a volvo 270 leg coupled to an izuzu 3.1,l turbo 130hp diesel its in a fairline fury at the minute. i was wondering would the 270 leg cope with more horse power and if so how much? i have an fl6 volvo engin6 cyl that came out of a small lorry hoping to use it. its 180hp. thanks to anyone who can help.:D
     
  2. WestVanHan
    Joined: Aug 2009
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    WestVanHan Not a Senior Member

    It's torque rating is more important.
     
  3. CDK
    Joined: Aug 2007
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    CDK retired engineer

    Stick with the Isuzu if the engine is in good shape. With a different turbo charger setting and some minor modifications you can get the power you want.
    Much cheaper and faster than converting a truck engine!
     
  4. whitepointer23

    whitepointer23 Previous Member

    the 270 is a strong leg. they were factory fitted to 225 hp v8's.
     
  5. Aliboy
    Joined: May 2011
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    Aliboy Junior Member

    As mentioned above, it is the torque of the engine that is the concern, not the hp. A leg that might take a 225hp petrol engine making it's hp at 4000rpm+, won't necessarily take the torque of a 180hp diesel that makes it's hp at a WOT of 2800rpm. If however your 180hp diesel turns 3800 - 4000rpm at WOT the leg may take it OK.
     
  6. gonzo
    Joined: Aug 2002
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    gonzo Senior Member

    That is correct, gears are rated for torque. The RPM range is quite wide, which changes the HP.
     
  7. WestVanHan
    Joined: Aug 2009
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    WestVanHan Not a Senior Member

    Three seconds to find that Volvo engine- 430 lb ft of torque.

    If you're going slow and not using boost-it should be OK but I'm thinking with a proper prop that hooked up-you may be asking for a broken drive right quick.

    I've seen this happen- Cummins 6BT in place of a gas engine- first good pull on the throttle and a very loud noise out the back.
    I told him,he didn't want to listen.

    BTW that Volvo is 600 kg /1300 pounds dry...into a 27 footer planing boat??
     
  8. Aliboy
    Joined: May 2011
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    Aliboy Junior Member

    If that FL6 engine is the 5.5l one, then no, the drive almost certainly won't handle it.
     
  9. WestVanHan
    Joined: Aug 2009
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    Location: Vancouver

    WestVanHan Not a Senior Member

    Google- Volvo 180 FL6- and it comes up on wiki as the 5.5
     
  10. whitepointer23

    whitepointer23 Previous Member

    if it only does 2800 wot then the boat will probably not plane anyway . you have to get a custom prop made with a lot of pitch and blade area. pitch is easy but getting enough blade area with a 16" max diameter is the hard part.
     
  11. whitepointer23

    whitepointer23 Previous Member

    [was it a volvo or mercruiser that broke. or omc.]
     
  12. WestVanHan
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    WestVanHan Not a Senior Member

    Ten years ago...don't remember.
     
  13. whitepointer23

    whitepointer23 Previous Member

    i bet it wasn't a volvo.
     
  14. bigmac25
    Joined: Aug 2012
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    bigmac25 New Member

    hi cdk, the izuzu is in top notch condition. what kind of tweaks could you suggest?
     

  15. CDK
    Joined: Aug 2007
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    Location: Adriatic sea

    CDK retired engineer

    First step is cutting the vacuum line to the turbo charger waste gate and installing a T with a needle valve there, so you can increase the amount of air pumped to the manifold. With more air you can burn more fuel, but don't overdo things because it increases the thermal load on the engine. Measure the turbine pressure with the needle valve closed, then slowly open it to rise the pressure by 20-25%.

    On a mechanical injection pump there is a set screw for the maximum injection amount, often with a red plastic cap over it. By turning it anti clockwise you can increase the amount injected. That is done in small increments of 10-20 degrees, using an exhaust gas temperature gauge. A sudden increase in temperature means you have gone too far and combustion continues with the exhaust valves already opening.
    Electronically controlled pump may need reprogramming or replacement of the memory chip. Specialist firms keep stock of such chips for a lot of engines.

    The higher power setting is of course not intended for continuous duty.
     
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