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Thread: Supercharging a 4BD1

  1. #1
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    Supercharging a 4BD1

    G,day guys just asking if any one has supercharged there 4BD1 and if so what type of supercharger did you use? Not iterested in turbocharging my engine as dont really what the hasstle of fitting an intercooler and all the dramas with heat and high exhaust temps.
    1950 80" #R06105221
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    Not a good result I'd imagine, part of the efficiency of turbocharging a diesel engine comes from utilising the waste energy from the exhaust gasses, a diesel engine is perfect for this as the rate of gas burn (actually a degree of afterburn) is perfect for driving a turbine. Supercharging on the other hand is a mechanical process, robbing power from the crankshaft rather than the rate of expansion and velocity of waste gasses.

    The other issue is a problem that exists with any diesel 4 cylinder engine is the destructive torsional vibrations, enough to do most superchargers a hard time in the shafts and bearings.

    I would be thinking down the turbocharging route, maybe picking a particular housing and turbine wheel combination to reduce lag, and intercooling isn't all that necessary below 10psi anyway.

    Mine has got almost 600,000km up now, a 4BD1 doesn't need all that much fuelling to produce decent torque figures which in turn keeps the exhaust gas temps at a reasonable level.

    JC

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    Quote Originally Posted by Lost Landy View Post
    G,day guys just asking if any one has supercharged there 4BD1 and if so what type of supercharger did you use? Not iterested in turbocharging my engine as dont really what the hasstle of fitting an intercooler and all the dramas with heat and high exhaust temps.
    A lot of the heat that the intercooler removes is due to adiabatic processes and compressor inefficiency. In short - superchargers also need intercoolers.

    There is a reason there are no factory supercharged diesels.

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    Quote Originally Posted by isuzurover View Post
    A lot of the heat that the intercooler removes is due to adiabatic processes and compressor inefficiency. In short - superchargers also need intercoolers.

    There is a reason there are no factory supercharged diesels.
    GM 671/871 ??
    PaulT

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    Quote Originally Posted by pop058 View Post
    GM 671/871 ??
    2 strokes need scavenge air. They aren't really a super in the sense the OP was talking about. GM's were later turboed and intercooled (6V/8V92TA; T=Turbocharged, A = Aftercooled etc etc) to be more powerful and efficient.
    Was overtaken by a big tour coach in WA once, I was doing about 95 and this thing just pulled out and went round me and as it went past, the little '6V92 Turbo' badge was for all to see. A big coach pushing some BIG air at that speed, with a V6 92 cube per cyl turbocharged 2 stroke, didn't sound like it was working all that hard, either....
    Great engines

    JC

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    and the 53 and the 93 but they're also 2 strokes...

    hmmm multiple force fed pistons going bang every down stroke....can you say more torque than a bunch of beer swilling yota drivers bragging about how their "truck/Rig" is better than a landy.?.
    Dave

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  7. #7
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    Quote Originally Posted by pop058 View Post
    GM 671/871 ??
    No. They are not true superchargers. 2-stroke diesels cannot run without air scavenging.

  8. #8
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    Shame about the weight of the buggers though....trying to find a alloy one would be near impossible I'd imagine...

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    Quote Originally Posted by isuzurover View Post
    No. They are not true superchargers. 2-stroke diesels cannot run without air scavenging.
    they are if you shorten the exhaust cam close ramp timing a couple of degrees (and up the ratio on the blower)
    Dave

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

    For spelling call Rogets, for mechanicing call me.

    Fozzy, 2.25D SIII Ex DCA Ute
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    Archaeoptersix 1990 6x6 dual cab(This things staying)


    If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
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  10. #10
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    Shame about the weight of the buggers though....trying to find a alloy one would be near impossible I'd imagine...as the rest said it's not a true supercharger it relies on scavenging effect pressurized sump etc etc...only bad thing I've heard about them is run on from oil ingress but they sound so good

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