Machining racing 2 stroke head turning, compression ratio, squish band, tuning

Рет қаралды 26,501

2 жыл бұрын

Processo completo di tornitura, incassatura e riprofilatura testa moto 125 2 tempi.
Rapporto di compressione misurato a fine lavoro è risultato di 13,4 a 1, ottimale per l'applicazione.
Questo lavoro viene fatto per variare il diagramma/fasature del cilindro, ma senza intervenire con fresino in canna modificando le luci, (cosa che eventualmente si può fare, ma non prima di questa fase, che porta ad allineare le luci con il cielo del pistone a PMI ( cosa che aumenta la sezione di passaggio utile, e migliora la fluidodinamica aldilà del discorso fasature).
Questo è il primo step da considerare in una preparazione nella quale il motore di serie esce con fasature volutamente basse per molteplici motivi. Ma chiaramente per un risultato ancora più marcato si andrà lavorare sull'area di scarico, luci, condotti, incrocio travasi, lanci e tutti gli altri interventi che portano a un aumento di coppia, potenza e anche un aumento dei giri che male non fà, considerando il motore che è un 54*54,5.
Grazie per la visione, alla prossima

Пікірлер: 18

@VildeFX 2 жыл бұрын

👍👍

@Dsm152 Жыл бұрын

Hi there. Why did you leave a step on the transition between squish band and head sealing face?

@genk94 Жыл бұрын

Hi, that's for transpose all the ports higher, increasing the timings. Then raising the cylinder with an alu shim to compensate and obtain a proper squish height. Then from there i tweak manually all the ports sections and timings 👍🏻

@janeali1174 2 ай бұрын

Sir i have two stroke cylinder i want to increase its rpm power please help me how i can increase the speed from its ports. Please help me tell me sir

@monej-gaming632 2 жыл бұрын

l'utensile per ri fare la camera, lo hai comprato o lo hai fatto tu?

@genk94 2 жыл бұрын

L'ho ricavato io da una barretta trapezoidale hss-co10, ne ho preparati 4 con diversa raggiatura che utilizzo in base alla cilindrata e al profilo/volume che punto a ottenere👍🏻

@jo098 8 ай бұрын

Hi thank for the video I look for the tool "HSS co10 radius " but I found nothing. It is DIY?

@genk94 8 ай бұрын

Yes it's a hss lathe tool bit that i've grinded with the radius i need, actually i have made 4 tools with different radiuses for this job. co10 stands for 10%cobalt in the alloy

@exormos 11 ай бұрын

hi can you tell me please how you attached the head to the lethe?

@genk94 11 ай бұрын

Sure, It's very simple. You Just need a round stock threaded with the same thread as the head, M14 and you're good to go. It works for any head that have a central sparkplug hole

@exormos 11 ай бұрын

@@genk94 when you mean round stock threaded you mean something like a bolt with the same threads?

@genk94 11 ай бұрын

@@exormos a round stock that you put on the lathe and cut the thread on It so you can grab the head on the chuck. It works for all the head with central sparkplug. For the head with lateral spark plug hole you'll need a special setup

@exormos 11 ай бұрын

@@genk94 Thank you for your explanation my uncle has a lathe and i did it today on my AM6 50mm piston engine

@Dzajs Жыл бұрын

You shouldn't polish the cylinder head to a mirror, because then the gasoline condenses

@genk94 Жыл бұрын

Never heard something like that before, can you explain what you mean? Probably have something to do with the boundary layer theory?

@themotocrossmodchannelWulfMX Жыл бұрын

I have researched this as well and all I can find is in relation to fuel in "fluid" form, not gaseous. Since the pressurized gas mixed with air is ignited prior to TDC and don't come into contact with with the surface of the head, I am not sure it would condense. This is of course, a theory and not proven as of yet. I can say that of all the years I have modified engines and polished heads, power valve parts, and exh ports, (basically anything that sees combustion), all it really has done was make for an easier time in servicing the cyl and removing carbon build up and offers no performance gain or performance decrease.

@matthewmoilanen787 7 ай бұрын

Ya that's not true and testing has shown that any rough surface in the combustion area is a spot that may cause pre-ignition. Combustion chamber temperatures will also prevent "condensation" of fuel. This heat is also a factor that requires richening of the fuel charge due to heat evaporation losses in the intake tract. This effect is rarely directly adjusted for but done in the overall jetting of that engine.