iemand ervaring hypereutectic pistons
iemand ervaring hypereutectic pistons
Wie heeft er ervaring met keith black hypereutectic pistons op lpg.
Lees hier en daar slechte berichten erover.
gr caddy123
Lees hier en daar slechte berichten erover.
gr caddy123
Re: iemand ervaring hypereutectic pistons
zitten er bij mij in, loopt prima. Kan er na ca 7000km niks geks aan ontdekken, ik rij zuiver op LPG, zit geen benzine meer in..
Re: iemand ervaring hypereutectic pistons
bron?caddy123 wrote: Lees hier en daar slechte berichten erover.
Re: iemand ervaring hypereutectic pistons
Hypereutectische zuigers houden meer warmte vast bovenin, bij de top en 1e ring land. Zuigerveer slotspeling wat vergroten op aanbevolen specs. Die claimer zuigers kosten geen drol.
Voor std motor prima spul. Ik heb nog wel een setje .030 trw l82 gesmede zuigers liggen. Zijn de overmaat van de 46466$ corvette zuigers. 1 valve relief, 5.7 rods, geschikt voor pressed en floater pin. Nos in doos.
Sent from my GT-I9000 using Tapatalk
Voor std motor prima spul. Ik heb nog wel een setje .030 trw l82 gesmede zuigers liggen. Zijn de overmaat van de 46466$ corvette zuigers. 1 valve relief, 5.7 rods, geschikt voor pressed en floater pin. Nos in doos.
Sent from my GT-I9000 using Tapatalk
Re: iemand ervaring hypereutectic pistons
Sjak dit bedoel ik:
Piston Failure
Pistons & Rings, Larry Carley, Automotive Rebuilder.
With each new generation of engines come changes that are designed to reduce emissions and extend durability. Key among these have been changes in piston and ring materials.
Piston changes
One of the "tricks" that the OEMs are using to reduce hydrocarbon emissions is to position the top compression ring closer to the top of the piston. This reduces the volume of the dead space between the piston and cylinder wall above the top ring that traps unburned fuel and contributes to incomplete combustion.
But moving the ring up places it closer to the combustion chamber and exposes it to higher operating temperatures. Consequently, the rings need to be thinner to reduce inertia and made of tougher materials such as ductile iron or steel so they can withstand the heat. If ordinary gray cast iron rings are used in such an application, it would greatly increase the risk of ring breakage.
Another consequence of moving the top ring up is that it reduces the thickness of the piston land area above the ring, which also increases the risk of the piston cracking if the engine experiences detonation. For this reason, many of the newer engines today have hypereutectic pistons instead of ones made of ordinary cast aluminum
Hypereutectic alloys are much tougher than the alloys used in ordinary cast aluminum pistons. Hypereutectic pistons (which are also cast, not forged) have a very high silicon content ranging anywhere from 16-22%. The excess silicon forms little hard spots in the alloy, giving the piston improved wear and scuff resistance at high temperatures. However, the added hardness also makes the pistons much more brittle than ordinary cast pistons, which means hypereutectic pistons must be handled more carefully.[/color]
Another change is that many pistons are getting shorter as the OEMs reduce deck heights for shorter blocks and reduced hood clearance. To maintain torque output, longer rods are used – which requires moving the wrist pin higher on the piston. This leaves less room for the rings, which means smaller rings must be used and crowded together more closely.
Reducing the thickness of the piston lands ad inserts as some pistons do to prevent land pound outlso increases the risk of breakage, so that's another reason for using hypereutectic pistons. The harder hypereutectic pistons experience less ring groove wear and do not nee
Hypereutectic pistons expand less than ordinary cast aluminum alloys, and CNC machining of the piston profile allows piston-to-bore clearances to be reduced. This also eliminates the need for steel struts inside the piston to control thermal expansion, which reduces piston weight and complexity. Eliminating the steel struts inside the piston also eliminates a potential source of trouble that may, under certain circumstances, lead to piston cracking and failure.
Piston Failure
Pistons & Rings, Larry Carley, Automotive Rebuilder.
With each new generation of engines come changes that are designed to reduce emissions and extend durability. Key among these have been changes in piston and ring materials.
Piston changes
One of the "tricks" that the OEMs are using to reduce hydrocarbon emissions is to position the top compression ring closer to the top of the piston. This reduces the volume of the dead space between the piston and cylinder wall above the top ring that traps unburned fuel and contributes to incomplete combustion.
But moving the ring up places it closer to the combustion chamber and exposes it to higher operating temperatures. Consequently, the rings need to be thinner to reduce inertia and made of tougher materials such as ductile iron or steel so they can withstand the heat. If ordinary gray cast iron rings are used in such an application, it would greatly increase the risk of ring breakage.
Another consequence of moving the top ring up is that it reduces the thickness of the piston land area above the ring, which also increases the risk of the piston cracking if the engine experiences detonation. For this reason, many of the newer engines today have hypereutectic pistons instead of ones made of ordinary cast aluminum
Hypereutectic alloys are much tougher than the alloys used in ordinary cast aluminum pistons. Hypereutectic pistons (which are also cast, not forged) have a very high silicon content ranging anywhere from 16-22%. The excess silicon forms little hard spots in the alloy, giving the piston improved wear and scuff resistance at high temperatures. However, the added hardness also makes the pistons much more brittle than ordinary cast pistons, which means hypereutectic pistons must be handled more carefully.[/color]
Another change is that many pistons are getting shorter as the OEMs reduce deck heights for shorter blocks and reduced hood clearance. To maintain torque output, longer rods are used – which requires moving the wrist pin higher on the piston. This leaves less room for the rings, which means smaller rings must be used and crowded together more closely.
Reducing the thickness of the piston lands ad inserts as some pistons do to prevent land pound outlso increases the risk of breakage, so that's another reason for using hypereutectic pistons. The harder hypereutectic pistons experience less ring groove wear and do not nee
Hypereutectic pistons expand less than ordinary cast aluminum alloys, and CNC machining of the piston profile allows piston-to-bore clearances to be reduced. This also eliminates the need for steel struts inside the piston to control thermal expansion, which reduces piston weight and complexity. Eliminating the steel struts inside the piston also eliminates a potential source of trouble that may, under certain circumstances, lead to piston cracking and failure.
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Re: iemand ervaring hypereutectic pistons
Prima spul zeker voor standaard motoren,lt1 generatie motoren zitten ze ook in en die draaien toch met een knappe compressie.
Poweradders is spelen met je motorleven,detonatie betekend dan snel einde ringlands en volgende revisie.
Poweradders is spelen met je motorleven,detonatie betekend dan snel einde ringlands en volgende revisie.
Re: iemand ervaring hypereutectic pistons
Ok dan, Ik heb in de usa geinformeerd en mts cadillac performance raad ze te strengste af ( die verkoopt ze ook niet meer hebben meerdere failures mee gehad), en cadcompany zegt gewoon doen verkoopt ze al jaren geen probleem!)
Vandaar mijn vraag!
Bedankt ga er 10.5 compressie mee draaien op lpg. is dat te doen met de hypereutectic?
Wilde eerst 11.5 compressie maar durf dat niet zo aan
gr caddy123
Vandaar mijn vraag!
Bedankt ga er 10.5 compressie mee draaien op lpg. is dat te doen met de hypereutectic?
Wilde eerst 11.5 compressie maar durf dat niet zo aan
gr caddy123
Re: iemand ervaring hypereutectic pistons
ik heb cr 11
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Re: iemand ervaring hypereutectic pistons
"Hypereutectic alloys are much tougher"
"also makes the pistons much more brittle"
En ik maar denken dat "tougher" het zo'n beetje het tegenovergestelde betekend als "more brittle": http://en.wikipedia.org/wiki/Toughness.
Als je niet gaat racen zijn die Hypereutectec dingen volgens mij prima.
"also makes the pistons much more brittle"
En ik maar denken dat "tougher" het zo'n beetje het tegenovergestelde betekend als "more brittle": http://en.wikipedia.org/wiki/Toughness.
Als je niet gaat racen zijn die Hypereutectec dingen volgens mij prima.
Re: iemand ervaring hypereutectic pistons
die met hypereutectic rijden wil jij niet op 1 avond aan je dinertafel hebben hoor...
zelfs jongens die lage 10 seconde rijden op de 1/4 mile.. ook met lachgas...
zelfs jongens die lage 10 seconde rijden op de 1/4 mile.. ook met lachgas...
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Re: iemand ervaring hypereutectic pistons
Iedere serieuze engine builder gebruikt die troep ook niet.. of het nou voor stok of high performance is.caddy123 wrote:Ok dan, Ik heb in de usa geinformeerd en mts cadillac performance raad ze te strengste af ( die verkoopt ze ook niet meer hebben meerdere failures mee gehad), en cadcompany zegt gewoon doen verkoopt ze al jaren geen probleem!)
Vandaar mijn vraag!
Bedankt ga er 10.5 compressie mee draaien op lpg. is dat te doen met de hypereutectic?
Wilde eerst 11.5 compressie maar durf dat niet zo aan
gr caddy123
even wat
meer betalen en betere kopen.
Re: iemand ervaring hypereutectic pistons
Jongens ik weet genoeg bedankt voor de reacties.
gr Caddy123
gr Caddy123
Re: iemand ervaring hypereutectic pistons
Ja? Wat weet je dan nou?
Re: iemand ervaring hypereutectic pistons
Ik ga voor de hypereutectic, en forged rods Cadcompany werkt er al jaren mee en geen problemen mee tot 500 pk.
Ik ga met een comp van 10.2-1 tot 450 pk en 4500 rpm dus dat moet zeker kunnen!
gr caddy123
Ik ga met een comp van 10.2-1 tot 450 pk en 4500 rpm dus dat moet zeker kunnen!
gr caddy123
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