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Polyquad Cylinder Head (Video 87) English Version скачать в хорошем качестве

Polyquad Cylinder Head (Video 87) English Version 3 года назад

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Polyquad Cylinder Head (Video 87) English Version
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Polyquad Cylinder Head (Video 87) English Version

Polyquad Cylinder Head Quick History : Polyquad was patented by David Vizard from U.S, where in 4 valves/cylinder engine, the valves diameter will be different for each valve, some manufacturers was using this configuration, but in the end, no big manufacturers use this configuration again (especially in the US) Polyquad Cylinder Head Purpose : To create "Swirl" or enough calculated turbulence in the chamber to increase engine volumetric efficiency that will increase chamber pressure, perfecting engine combustion in short, it will produce more torque and horse power Science behind Polyquad Cylinder Head : Creating "swirl" by making 2 different inlet/exhaust port area, that in the end will increase the air flow speed to the chamber (or from the chamber), that will increase the debit of the air mixture in the chamber Disadvantages of Polyquad Cylinder Head: The speed of the air flow depends on the RPM, the higher the RPM, the higher the air flow speed, the higher the air flow speed, the greater the turbulence that exists, in the end, if the compressed air due to turbulence becomes the thing that adds pressure in the engine, in the a certain engine RPM actually reverses, the turbulence will provide a vacuum due to fluid movement (AFM) such as forming a wall, not to mention other turbulence produced by the dome shape and the shape of the piston itself, while in the racing world, low VE at high RPM will be very detrimental, because the power achieved will not be optimal When is the use of a Polyquad Cylinder Head considered appropriate? 1. Low RPM limit, for us personally, we set the peak power limit at 8,000 RPM with a 10,000 RPM limit (can be tolerated a little) 2. Cannot use the exhaust area for engine breathing (Examples are the case of using standard exhaust on a tune up engine, or small header exhaust) 3. Has good material strength in the piston sector, piston ring, connecting rod, and crankshaft Example of implementation Yamaha NMax 2016 Non ABS Piston 6 cm (2.36 inch) Stroke 6.2 cm (2.44 inch) Inlet Valve 1.95 cm (0.77 inch) & 2.3 cm (0.9 inch) Exhaust Valve 2.1 cm (0.83 inch) & 1.75 cm (0.69 inch) Programmable ECU Stock Fuel Line Stock Exhaust Gearbox 14/33 Piston Gap 0.02 mm (0.0007874016 inch, i don't know how they measure this small amount of length with inch, so i will just copy and paste it from google measurement in inch) 1st version : 1st Piston Ring Gap 0.17 mm (0.006692913 inch) Static Compression Ratio 10.5:1 It turns out that using RON 92, AFR 10-13:1 (0.7-0.8 lambda) there are still symptoms of detonation (tingling), which indicates the pressure in the engine was too high, even though engine oil temperature is normal even considerably low, it is always below 95°C, but this configuration has entered the maximum limit of engine material strength. V2 is out, just a lil bit of change Piston Ring Gap 0.12 mm (0.004724409 inch) Static Compression Ratio 9.8:1 detonation symptoms are gone, power is still very good starting from the lower RPM, EOT is normal too In the near future we will be brought the motorcycle to the dyno, even with 175.3cc , but the power gain will not be much different from the 166cc NMax engine in the previous project, possibly the power at the rear wheels is still around 16-17 WHP, it's just that the torque is high enough to reach 21 Nm on the same dyno In the end it takes careful calculations for the implementation of the Polyquad Cylinder Head, and only in some cases this can be implemented (it is also pretty expensive) Who is involved in this project Decision Maker : Andri Eldana Head of Mechanic : Mad Husni Secondary Mechanic : Alfian Helper : Vian Pratika Backsound : Andy Prasetyo Author & Editor : Andri Eldana Footnote Give Away Jupiter MX 331.75 cc and Spacy is still continuing if this video reaches 20 million dislikes, then spacy supercharger will be given away If before the give away this video reached 35 million dislikes, then MX 331.75cc was given away If it reaches 55 million dislikes, then the 2 motorbikes will be given away give away from reaching subs target also still continue #yamaha #nmax #boreup

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