Overhead camshaft

Overhead camshaft, commonly abbreviated to OHC, is a valvetrain configuration which places the camshaft of an internal combustion engine of the reciprocating type within the cylinder heads ('above' the pistons and combustion chambers) and drives the valves or lifters in a more direct manner compared to overhead valves (OHV) and pushrods.

Overview

Compared to OHV pushrod systems with the same number of valves, the reciprocating components of the OHC system are fewer and have a lower overall mass. Though the system that drives the camshafts may be more complex, most engine manufacturers accept that added complexity as a trade-off for better engine performance and greater design flexibility. The fundamental reason for the OHC valvetrain is that it offers an increase in the engine's ability to exchange induction and exhaust gases. (This exchange is sometimes known as 'engine breathing'. ) Another performance advantage is gained as a result of the better optimised port configurations made possible with overhead camshaft designs. With no intrusive pushrods, the overhead camshaft cylinder head design can use straighter ports of more advantageous cross-section and length. The OHC design allows for higher engine speeds than comparable cam-in-block designs, as a result of having lower valvetrain mass. The higher engine speeds thus allowed increases power output for a given torque output.

OHC (disambiguation)

OHC is a three-letter acronym that may refer to:

  • Overhead camshaft
  • Ocean heat content
  • Order of the Holy Cross, a monastic community
  • Outer hair cell, a vertebrate body cell
  • Office for Humanities Communication, co-publisher of Humanist and affiliate of King's College London School of Arts and Humanities and University of Oxford
  • Ontario Housing Corporation
  • Occupational health clinic, a health clinic that specializes in occupational health
  • Organizational health center, an industrial organization in occupational health psychology
  • Oxford Harmonic Choir
  • Open House Chicago, an annual architecture festival hosted by the Chicago Architecture Foundation
  • See also

  • OHCS, Oregon Housing and Community Services Department
  • POHC, reporting mark for the Pittsburgh and Ohio Central Railroad
  • Podcasts:

    PLAYLIST TIME:

    My World

    by: O.C.

    Uh, yeah y'know, shit is wild he, heh
    Can't complain though I'm alive
    Healthy and all a that knahmsayin?
    Just tryin' to do my thang, praise to all
    Bust it that nigga Slick Rick said, I waited long time sweatin' it
    I got jerked but now I'm gettin' it, hazy like asthma bizarre disaster
    Stress almost held me down from bein' a master
    The faster preacher, poet, a teacher, it's been so long like Monifah
    Believe that I'm needed, in rappin', I breathe this
    Some pick up a microphone and can't even achieve this
    Oscar award winning your shit, I'm bored with it
    Stop copy-catting son
    (Why?)
    'Cause your dog did it
    Get your own lingo, make up your own jingle
    Ten years later you be bitin' my single
    Primo, take it downtown, swing it
    Intervenin' on the board, sensimil steamin', yeah
    Catch the vibe like a tribal dance
    In the clubs on the low with the boy stance
    Money rubbin' with a shorty got bumped by a chump
    Tell him, step off, I'm doin' the hump, yeah
    I say it's my world and I won't stop
    And if you stand in my way you bound to get dropped
    Some wish that I was gone 'cause they know I'ma win
    In a minute, I'll be makin' six G's times ten
    I'm the computer, printin' out data take notes
    Then analyze the information and press send
    Freaky like porno, Ron Jeremy saw no
    Obstacle or pussy to stop him from bonin' a hoe
    Me and the mic double trouble
    Chicks look at us like twins, all lovable and huggable
    Prognosis, on the, mic I choke out
    Had the same effects from coughin', blowin' smoke out
    Architect, rap technician, man listen
    It's no doubt you gonna pump this in your system
    My skills ill and all of that above
    Confidence, I'm not worried 'bout a street buzz
    I'm O.C., who you? I never heard of ya
    Get out my face 'fore I turn into a motherfuckin' murderer
    I want the green like indo, a mansion, a car
    A wife who's never been a bimbo
    Too much to ask, well, to me that's simple
    Wanna retire on a yacht called the S. S. Minnow
    I say it's my world and I won't stop
    And if you stand in my way, you bound to get dropped
    I say it's my world and I won't stop
    And if you stand in my way, you bound to get dropped
    I say it's my world and I won't stop
    And if you stand in my way, you bound to get dropped
    I say it's my world and I won't stop
    And if you stand in my way, you bound to get dropped
    Top choice, this here nigga got poise
    Ain't a man alive who could stop my noise
    I snatch a star from the sky, spark up your lye
    You stand astounded wonderin' how I did it
    Now you're star struck, like I truck gold
    Treatin' me like a nigga havin' a million records sold
    Now a star child, phenomenon like the X-Files
    Rappers know I'm comin' so they go in exile
    Czar in this rap shit, comin' on your mattress
    Microphone fiend, I make beats do back flips
    Fear me like genocide, serious
    How I do it through your stereo, mysterious
    O.C. do demolition, nil competition
    Like robot Kong on a destroy mission
    A matter of life and death you try to fight for breath
    I snatch your heart from a slice through your chest
    Who the best from New York to Bogota?
    Who got face thinkin' they scare me with a scar, shit?
    What I be bringin' is a terrible sight
    A performance never again performed on the mic
    I say it's my world and I won't stop
    And if you stand in my way, you bound to get dropped
    I say it's my world and I won't stop
    And if you stand in my way, you bound to get dropped
    I say it's my world and I won't stop
    And if you stand in my way, you bound to get dropped
    I say it's my world and I won't stop
    And if you stand in my way, you bound to get dropped




    Latest News for: ohc

    PROTECTIVE GEAR: OHCE club makes hats, seat belt covers

    Tahlequah Daily Press 28 Mar 2025
    Patients with cancer often lose their hair, leaving their heads exposed to the chill of winter and air conditioning. Seat belts are often abrasive to thinning skin, and homeless individuals need protection from the elements ... .

    County OHCE to host plant swap in April

    The Duncan Banner 17 Mar 2025
    For anyone who wants to start digging in their garden this year, the Stephens County Oklahoma Home and Community Education clubs will help provide the first steps at the end of April ... .
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