turbo: blow thru vs. draw thru

Discussion in 'Forced Induction Mopar' started by kittypancake, May 3, 2012.

  1. pishta

    pishta I know I'm right....

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    So...how do you control boost? That's deadly! :thumbsup:
     
  2. mrproffitt

    mrproffitt Member

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    Boost is controlled by the A/R ratio of the turbine housing size and it has a small bypass hole the housing that can be adjusted. Also ignition timing has a part of it. Correct A/R housing (mine are 1.0), hole is plugged, timing under boost is 21 degrees. Starts making 5 psi boost at 3000 rpm and 10-15 at 5000. But I can’t hold on to the handlebars long enough to stay at rpm. Gears are 2.73 (C4 Corvette trans and transaxle) trike weighs 1250 pounds. Halfway through 3rd gear I’m hitting 150 and climbing fast. Never have maxed it out because I can’t hold on from the instant acceleration and pull from the torque.

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  3. YY1

    YY1 Well-Known Member

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    That's pretty bad-ass!
     
  4. mrproffitt

    mrproffitt Member

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    Thanks, that’s 5 years of not wasting time in front of the TV. All built in the garage.
     
  5. mrproffitt

    mrproffitt Member

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    Inside the plenum. I added a “priority valve” by using some carbon fiber reed valves. This is so it does not bog down when you floor it. This was done by the factory many years later as the technology progressed in n the early 70’s.

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  6. mrproffitt

    mrproffitt Member

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    This is a result of 24 psi and the wrong timing.

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  7. pishta

    pishta I know I'm right....

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    I wonder what the worlds fastest trike is? you should put a sissy bar on it and a headrest and go for it at Bonneville. When you get tired of it, put the motor and rear in a Manx buggy with some slicks!
     
  8. mrproffitt

    mrproffitt Member

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    I was originally building it for the salt flats when the SCTA informed me there is no “Trike” class and that any “motorcycle” class engine had to be built using 90% motorcycle parts. The Arizona Timing Association does have a run what you bring class with a $5000 prize for fastest time and $5000 for $5000 for top speed of the meet. I was calling it White Noise then for a cool salt racer name. Now it’s called Mental Illness. If you consider the Bloodhound SSC, it’s around 900 mph. But its a jet powered and rocket boosted sled sitting on three aluminum wheels.

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    • oliver

      oliver Well-Known Member

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      Looks like too tight of ring gap. what gaps were you running? are those hypers? On boosted engines with hypers im running close to .030 end gap on top ring and .032 on 2nd.
       
    • mrproffitt

      mrproffitt Member

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      Yes, as a matter of fact the pistons knocked all the ring lands off due to too tight of clearance on the factory ring gaps. That was a junk motor with 200k miles I used to experiment with and learned a lot from it. Now running .040” on top, .035” on 2nd ring on a rebuilt 5.3 with new factory rods, floating pistons, and ported heads. Timing at boost is now 19-21 degrees so there’s a better cushion to prevent detonation. If I run a water/meth injection, I can raise the timing and get more power, but it has plenty enough already.
      This is my first trike I built with a 383 stroker making 450hp. DEI did the balance work on the engine and it was an amazing engine, all forged internals. Split the transmission in half twice on it spinning the engine hard! TCI replaced it both times, said they never seen it before other than mud bog trucks.

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    • mrproffitt

      mrproffitt Member

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      You know what’s really odd is the fact that it knocked the ring lands off 7 of the 8 pistons in the exact same place on the pistons, but the top ring gaps where in various positions and not where the chunks broke out. I think the #6 was the only one that didn’t. But all the others in the exact same position. Which happened to be where the high squish and largest squish area of the combustion chamber is.