zorbek
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25-04-2008, 21:16:16 -
EG6 KJconception a écrit :zorbek a écrit :KMS ne fabrique pas de pistons, sur la photo ça ressemble fort a des supertech. et ca vaut quoi
413$
conneries mises a part, c'est du forgé, c'est des pistons. ce qui importe c'est de respecter les tolérences..
Supertech pistons are manufactured from extruded high silicon, enhanced 4032 alloy that low thermal expansion, excellent wear resistance and higher thermal conductivity. A phosphate dry lubricant coating is applied to pistons to protect against ring micro welding and ehance skirt lubrication.
Supertech Performance has more than 30 years of experience under its belt in the design of racing pistons and the utilization of the latest CAD software & Finite Element Analysis enables them to design strong high-performance lightweight pistons for each application. Supertech pistons are manufactured from extruded high-silicon, enhanced 4032 alloy (with additional Cu, Ni & Mg) that has low thermal expansion, excellent wear resistance and higher thermal conductivity. A three step forging process yields a fine structural grain oriented in fibers in the same direction of the stresses. Several heat treatments provide the piston with a high tensile strength and evenly distributed hardness that will withstand boost up to 42psi. The slugs are CNC machined with special diamond tools for dimensional precision, perpendicularity and flatness of the ring grooves. Contact reduction grooves are standard. A phosphate dry lubricant coating is applied to protect the rings against micro welding and enhance lubrication on the skirt/cylinder area.
Attention, je suis un con!!
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ti pat
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26-04-2008, 00:04:53 -
Je peux pas dire pour les supertech, mais un préparateur très connu aux states (Don Flores) m'avait conseiller de prendre des pistons Wiseco ou Cp.
Que c'était le top. Avec des trucs comme le traitement des jupes comme les type R, le phénomène de rollerwave, le dessus polit, la supression de tout les angles vifs sur le dessus du piston, l'axe avec le diamètre intérieur conique, les jupes diminuées, avec des bonnes hauteurs de pistons pour avoir des bonnes chasses, etc.... J'arrête là mais bon y a bien encore quelques ruses.
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ti pat
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26-04-2008, 01:44:50 -
En gros c'est ça... le bombage est plus prononcé d'un côté du piston pour justement créer ça, et puis normalement y a pas la même hauteur aussi au niveau des chasses pour amplifier le truc.
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ti pat
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26-04-2008, 22:06:17 -
Un peu mieux d'explication pour ceux que ça intéresse
Citation : Roller-Wave....What Is It?
In the mid-to-late '70's, I found that biasing the mixture to the exhaust-side of the piston netted lower fuel consumption, as well as considerably less tendency for detonation in 2-valve NASCAR and drag race engines. Those experiments ultimately lead to swirl combustion technology that dominates 2-valve race head design today. Today's 4-valve pent-roof combustion chambers don't lend themselves to conventional swirl combustion as readily, so a rethink was required to mechanically enhance their combustion properties.
Since confining mixture and initiating the burn on the exhaust-side of the piston takes full advantage of exhaust-valve heat for mixture ionization, I utilized tighter (and larger area) quench clearance on the intake-side of the piston to force a mixture wave to flow toward the exhaust-side of the chamber as the piston approaches TDC. I've incorporated less piston dome volume on the exhaust-side with both more piston to head (quench) clearance, as well as the trough that incorporates both exhaust valve relief's. This trough lines up precisely with the down-sloping combustion chamber at TDC, reflecting and rolling the mixture that's traveling toward it from the intake-side. Confining a rolling turbulence to the exhaust-side of the piston insures that more mixture components will be lighted during ignition, and a faster, more complete combustion event will result....permitting one to use less spark advance and fuel, to achieve more power and less detonation in any application, whether normally-aspirated or forced-induction.
When one has the ability to shape the combustion event using mechanical design, it's possible to also design the tuning parameters the engine will "want", rather than living with compromised tuning and performance created by the use of more generic combustion space designs.
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ti pat
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26-04-2008, 22:11:32 -
Wiseco ou Wossner???Par contre JE apparement c'est pas top sur voiture.
J'ai un ami qui a eu des soucis avec. Au niveau de la segmentation, le chrome je crois c'est barré et rayé les cylindres.
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