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Recent content by Ibrahim M

  1. Ibrahim M

    Turbocharger manifold design

    What effect the angle of the merge collector have on turbo manifold design ? Will a acute angled merge provide better spool because less K.E is lost (due to the pipes being almost inline with turbine inlet )? Or will a obtuse angle merge works better at that due to lower volume ? Also when...
  2. Ibrahim M

    Turbocharger turbine to compressor sizing

    Thank you for your answer, i didnt connect for a lomg time
  3. Ibrahim M

    Turbocharger turbine to compressor sizing

    Hello, What is the theory behind sizing of turbine wheel to compressor wheel ? I take that compressor inducer to turbine exducer is what matters the most ? But why did we see "hybrid" turbos appear ? Like a t4 compressor with a t3 turbine ?
  4. Ibrahim M

    Turbine map corrected mass flow ?

    Hi, Can someone explain to me what are these 3 different way of calculating Mred for turbine maps ? Top group is the normal formula, the one i use usually Middle circled in red is new one i came across, what is "s" before bar ? And why not just use sqrt instead of K^0.5 ? And bottom one...
  5. Ibrahim M

    Torsional vibration book

    Hello, Can anyone share PDF version of the 5 volumes of Ker Wilsons books on torsional vibration ? Not that i dont want to buy them, but i simply cant find them new, used or pdf for sale. Libraries that have them will not share access unless im a student, which i am not. Thank you
  6. Ibrahim M

    Bolted flange/ friction / torque

    Lets say i have a bolted flange type of drive, operating solely on the friction between the 2 faces. Keeping things simple, at equal bolt preload , will more bolt equal more torque to be transfered ???
  7. Ibrahim M

    Turbocharger Balancing

    How do they exactly clock the turbocharger shaft to grind exactly where its needed on these machines ??? https://www.youtube.com/watch?v=R6CGnRZv620 I believe the magnetic sensor at front measure speed and phase. But then they remove the sensor of the way and turn the shaft to grind...
  8. Ibrahim M

    Engine cooling

    Howdy, Can someone help me understand the relationship between cooling flow rate and radiator sizing ? For a given engine, if cooling isnt sufficient, you can : Increase flow rate, which increase energy removal rate but delta T across radiator will stay the same ? Increasing radiator area...
  9. Ibrahim M

    Turbo size, pressure and tq/hp figures ?

    Often enough, when you use a bigger turbocharger on a given engine, all things being equal ( same pressure / hardware etc... ) you find that the engine will make more power with the bigger turbocharger at the same boost ? Is the higher compressor efficiency and lower EMP the only 2 factors...
  10. Ibrahim M

    Two stroke motor / thermal barrier coatings

    Hi, What would be the effect of thermal barrier coating on the combustion chamber ( piston face and head ) on a 2 stroke ? Some say it will cause detonation, i dont see why ? Higher end of compression temp maybe but this would mean more pressure and also faster burn rate so that you could...
  11. Ibrahim M

    WRC cars, locked center diff, handbrake turns ?

    Well maybe not actual ones then , i meant the ones about 2014/2018 about. They had no center diff at this time.
  12. Ibrahim M

    WRC cars, locked center diff, handbrake turns ?

    Hello, I know for a fact that actual WRC cars is no center diff, it is locked between front and rear axle. What happens when they use the E brake for a tight turn ? Is the driveline elasticity enough to lock the rear wheels and not the front at the same time, just long enough to break rear...
  13. Ibrahim M

    Lean condition = Idle hang, why, the scientific reasoning ?

    Hello, Why does usually a lean idle causes the rpm to drop very slowly when you shut the throttle ? Rather than very quickly when it is too rich ? Is it because it burns hotter and 100%of the fuel is burned ? Thanks
  14. Ibrahim M

    Steering wheel twitchy on bumps / racecar

    Ciba, sadly tjis isnt my video but i could probably film my car next time i go to the track. Can you explain how caster reduces the Maximum Fy ???
  15. Ibrahim M

    Steering wheel twitchy on bumps / racecar

    Hi What geometry problem causes the steering wheel to twich when passing small bumps / road defects like on this video : https://youtu.be/X1i90PivtaU Around 0:20 you can see it going in the turn Excessive scurb radius ?
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