Løfter Ventilløfteren sidder mellem knastakslen og resten af ventiltoget En ventilløfter er den del af motoren, der overfører bevægelsen fra knastakslen videre til resten af ventilsystemet. Hver gang en knast på akslen passerer, presser den løfteren opad, og den bevægelse føres videre, enten direkte til en ventil eller via en stødstang og en vippearm, afhængigt af motorens opbygning og placeringen af knastakslen i motorblokken. En hydraulisk ventilløfter har derudover den funktion, at den automatisk holder ventilspillerummet på nul, hvilket betyder, at der ikke opstår unødig slør i systemet, mens motoren varmer op og køler ned, og temperaturen i topstykket ændrer sig. Denne funktion gør, at man normalt ikke behøver at justere ventilspillerummet manuelt, som det ellers er tilfældet med mekaniske løftere, hvor spillerummet skal kontrolleres og efterspændes med jævne mellemrum. Fordi løfteren indgår i en kæde af bevægelige dele, kan selv en enkelt slidt eller defekt løfter påvirke, hvordan hele cylinderens ventiler åbner og lukker, hvilket i sidste ende går ud over motorens samlede funktion, ofte hørbart som en tikkende lyd fra motoren. Hydrauliske, mekaniske og rulleløftere Der findes tre hovedtyper af ventilløftere: hydrauliske, mekaniske og rulleløftere. Hydrauliske løftere er de mest almindelige i almindelige gadebiler, fordi de kræver mindre vedligeholdelse og automatisk holder korrekt spillerum, uden at ejeren løbende skal justere på systemet. Mekaniske løftere kræver til gengæld regelmæssig justering, men foretrækkes ofte i mere ydelsesorienterede opbygninger, hvor man ønsker fuld kontrol over ventiltimingen uden den lille forsinkelse, en hydraulisk løfter kan give ved høje omdrejninger, og hvor motoren ofte køres tættere på sin grænse. Rulleløftere adskiller sig ved, at kontakten mellem løfteren og knastakslen sker via et lille rullehjul i stedet for en flad kontaktflade, hvilket reducerer friktionen og slitagen mellem delene og samtidig gør det muligt at bruge mere aggressive knastprofiler uden overdreven slitage. Valget mellem de tre typer afhænger derfor både af, hvordan bilen bruges, og hvilken knastaksel den skal arbejde sammen med, da løftertype og akseltype normalt skal matche hinanden for at fungere korrekt og undgå unødig slitage på begge dele. Løftere til den rigtige motorblok og det rigtige mærke Ventilløftere er ikke universelle dele, og de skal passe til den specifikke motorblok, de skal monteres i. Der findes varianter til blandt andet Small Block, Big Block, LS og Flathead, samt til mærker som Chevrolet, Ford, Chrysler og flere andre klassiske amerikanske fabrikater, hvor hver motorfamilie stiller sine egne krav til løfterens dimensioner og form. Mærker som Clevite, Comp Cams, Edelbrock, Egge, Ford Performance og Melling Engine Parts tilbyder løftere til mange af disse motorfamilier, ofte i alle tre typer: hydraulisk, mekanisk og rulle, så man kan finde en løsning, der matcher både motorblokken og den måde, bilen skal bruges på. Når du skal vælge løftere, bør du derfor tage udgangspunkt i både motorblokkens type og den knastaksel, løfteren skal arbejde sammen med, så hele ventiltoget fungerer som en samlet, korrekt afstemt enhed, i stedet for at vælge dele isoleret fra hinanden og risikere, at komponenterne ikke spiller sammen som tiltænkt. Udvalget dækker blandt andet Small Block, Big Block, Cleveland, Hemi, Modular, LS, LT, L6 og V6, samt fabrikater som American Motors, Buick, Cadillac, Chevrolet, Chrysler, Ford, Oldsmobile og Pontiac, så der findes løftere til både ældre og nyere amerikanske motorkonstruktioner. Da løftere fra forskellige producenter kan være beregnet til lidt forskellige knastprofiler og driftsforhold, er det en god idé at holde sig til løftere, der er udviklet til at matche den konkrete knastaksel, frem for blot at vælge efter motorblokken alene.

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ENG VALVE LIFTER LOCKING BAR
COM0894-L

ENG VALVE LIFTER LOCKING BAR

Roller Lifter Link Bar For Cylinders 1,3, 6 And 8 In Chevrolet Sb2

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ENG VALVE LIFTER LOCKING BAR
COM0895-L

ENG VALVE LIFTER LOCKING BAR

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ENG VALVE LIFTER KIT

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COM15821-1

Løfter

This Non-Link Bar Hydraulic Roller Lifter Features Short Travel. This Lifter's Short Travel Allows For Light Pre-Load And Reduced Oil Volume For The Highest Revving Lifter For Gen Iii Chrysler 6.4l He ...Vis mere

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COM15821-16

HYDRAULIC ROLLER

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COM2901-1

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COM2910-1

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This Performance Series Solid Lifter Features A Precision-Ground Crown Radius And Surface Finish, Perfect For High-End Street And Race Engines With Higher Spring Pressures. For Ford 289-351w/c-400m An ...Vis mere

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Comp Cams' Basic Dod Delete Kit For Gen Iv 6.0 Includes A Set Of 8 Premium Lifters, Lifter Trays, Head Gaskets And Bolts Along With An Ls3 Valley Cover.

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ENG VALVE LIFTER KIT
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The Gm L83 Dod Delete Kit Includes Everything Needed To Properly Remove Problematic Displacement On Demand Lifters. This Kit Includes Block-Off Plugs, Lifter Trays, Head Gaskets, Head Bolts And Lifter ...Vis mere

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COM5563-KIT

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COM800-1

Løfter

This Performance Series Edm Solid Lifter Features A Precision-Ground Crown Radius And Finish, Along With An Edm Oiling Hole, Perfect For High-End Street And Race Engines With Higher Spring Pressures F ...Vis mere

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ENG VALVE LIFTER
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COM801-1

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Designed And Manufactured To The Tightest Tolerances, This Solid Lifter For Amc 290-401 And Chrysler 273-360 Features An Exactly Milled Oil Meter Band As Well As A Precisely Ground Lifter Face.

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ENG VALVE LIFTER KIT
COM801-16

ENG VALVE LIFTER KIT

Designed And Manufactured To The Tightest Tolerances, These Solid Lifters For Amc 290-401 And Chrysler 273-360 Feature An Exactly Milled Oil Meter Band As Well As Precisely Ground Lifter Faces.

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COM802-1

Løfter

With A Patented Orifice Metering Valve And A Lightweight Check Valve Disc This High Energy Hydraulic Flat Lifter For Chevrolet 173, 207 And 2.8-3.4l Engines Provides Quicker Response And Better Perfor ...Vis mere

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