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UTERUS

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Posts posted by UTERUS

  1. Ok so for years i've been wondering why tractor pullers take so long to build rpm and boost, and only just thought to google it.

    Sorry if this is really obvious to you guys, but this blew my mind.

     

    The diesel pullers run a low compression engine..   Engine compression heats the  air hot enough to ignite the injected diesel fuel.   With the lower compression, diesel fuel has trouble igniting in the cylinder. This is why you see many of the diesel puller engine start with LOTS of ether assist.                        To build heat in the cylinder the puller will very slowly advance the throttle to speed the engine.  If he pushes the throttle too quickly the additional fuel will cool the cylinder enough that the engine will die.   As he advances the throttle he will load the engine by slipping the clutch.  As the engine takes more load, the turbo, or turbos will start to build manifold pressure.  As the manifold pressure increases the cylinder pressure rises allowing more fuel to burn.  The more fuel that burns, the faster the turbo spins,  the faster the turbo spins the more fuel.  (you get the picture)   As HP and RPM build the engine will finally be making maximum horsepower and the clutch can be released.  And the pull is ON.. 

     

     

    P.S.   The low compression is so the turbo can pack more air into the cylinder without blowing a head gasket or worse. 

    How amazing is that, it's squirting in so much fuel that it can put out the fire.

    • Like 8
  2. 2 hours ago, Yowzer said:

    Why not run a whateverthosethingsarecalled that make make single phase into three-phase?

     

    2 hours ago, kyteler said:

    Or just buy a single phase motor and bolt it up?

     

     

    So I've recently been through this, as my flatmate purchased a three phase hoist and we only have single phase. 

    Here's my shit yarn about the subject. 

    I've repaired 5 different vehicle lifts over the last couple of years too. 

     

     

    Having a hoist without clear floor sucks, I don't care if you put bits of wood either side and say its fine, it is a pain in the ass and worth paying another $1000 to not have to deal with it. 

     

    A service history means fuck all, technicians are lazy and will cut corners. 

     

    Setting up a VSD to run a hoist is many hours of wiring and programming, doable but a pain. 

     

    Phase converters are expensive. 

     

    I decided the best option was to convert to a single phase motor, as it was reasonably priced and only needed wiring changed. 

    I could re use the existing contactors (in hindsight I should have changed it for a higher current rated one but $$$), only needed to run a new cable from motor to control box and re wire the controls. 

    What I didn't think about was that the single phase 4 pole motor runs faster than the old star wired three phase motor. This was a problem as the hoist is screw type with flogged out nuts, so it would be nudging 40A at times which is pushing my luck if lots of things in the house are running and I send a truck up in the air. 

    The original drive was triple A section pulleys, but they don't make them small enough to get the reduction we needed. 

    So we welded smaller and bigger motorbike sprockets to the pulleys, which helped a lot to the bring the current down. However its now horrifically loud as the chain transmits all the hard working motor noise into the hoist, for it to vibrate your brain. 

     

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  3. If you just wanted to run the trike for now, I wouldn't be worried about the 02 sensors. 

    I had a 92 UZZ30 and unplugged the 02 sensors and afm when trying to narrow down an issue. It ran mildly more rich but still ran great. 

    • Like 1
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