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    kelebihan dan keburukan port & polish Head

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    nomo
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    04062008

    http://i38.servimg.com/u/f3 kelebihan dan keburukan port & polish Head

    Post by nomo

    saya nak tau apa kelebihan dan keburukan kalau kita port and polish head enjin
    Share this post on: Excite BookmarksDiggRedditDel.icio.usGoogleLiveSlashdotNetscapeTechnoratiStumbleUponNewsvineFurlYahooSmarking

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    Post on 5/6/2008, 11:13 am by lentugi

    erm....kalau head tu kasi polish saja???

    P/s: apa bah maksud dia Polish ni??? kasi kilat pakai autosol ka?? Suspect
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    Post on 5/6/2008, 11:24 am by blugu

    Porting maksudnya kasi besar, lepastu polish kasi licin permukaan yg di porting tuh mcm cermin, autosol pun bleh pakai, tapi dia ada bahan khas utk polish... itu yg sy taulah...
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    Post on 5/6/2008, 11:26 am by lentugi

    blugu wrote:Porting maksudnya kasi besar, lepastu polish kasi licin permukaan yg di porting tuh mcm cermin, autosol pun bleh pakai, tapi dia ada bahan khas utk polish... itu yg sy taulah...


    ooo...jadi klu polish pakai kikir atau kertas pasir pun blh la ni??

    Post on 5/6/2008, 1:38 pm by drakult

    pjayk wrote:port and polish mmg bagus klu mau enjin kuat... but 1st mmg klu angin dah banyk, minyak pun kena big flow... penjimatan petrol mmg nda wujud lagi...

    klu port n polish jak, ndada guna klu piston masi std.. at least low compression, valve tukar besar.. aku pernah try pakai valve toyota... setakat 38psi no problem.. but at least engine management kena ada mcm 5 button.

    tepuk dada tanya selera.. buat apa port and polish klu stakat mau pakai keta tu pi kerja atau pi pasar atau bw anak bini pi tg aru makan jagung... klau mcam gila kuasa lenlah... terpulang dgn individu itulah klu mau kuat, jgn mengomel klu pulang balik kk-putatan minyak rm10.. lol!

    reply yang penuh makna..hehehee

    Thanx to bro pjayk and blugu for thier honest advice..MANTAP!!?!! Very Happy

    Post on 5/6/2008, 3:03 pm by LoLLiPoP

    drakult bahagian bawa anak bini pi mkn jagung tu yg MANTAP??!?? kan... hehehehe...

    pakai 99 atau auto sol pun boleh bah... dah nama polisher... lol!
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    Post on 5/6/2008, 4:09 pm by blugu

    lentugi wrote:
    blugu wrote:Porting maksudnya kasi besar, lepastu polish kasi licin permukaan yg di porting tuh mcm cermin, autosol pun bleh pakai, tapi dia ada bahan khas utk polish... itu yg sy taulah...


    ooo...jadi klu polish pakai kikir atau kertas pasir pun blh la ni??

    boleh, senang saja... cuma kena ada kesabaran & konsentrasi, licinkan semua lubang2 head tuh, lagi senang kalau ada spare head utk di projek

    Post on 5/6/2008, 4:34 pm by ProjectD

    cip blugu sudah berkata2....kalau men 4age choke trus tu butterfly yg di intake manifold...baru power cepat datang...
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    Post on 6/6/2008, 5:05 am by blugu

    Gunakan yg kasar dan halus punya kertas pasir....
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    Post on 6/6/2008, 5:57 am by pioneer_syntium

    sa x berani buat p&p ni, manala tau cip silap habis.
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    Post on 6/6/2008, 6:50 am by shalina7981

    kasar/halus tu polish bagi aku utk gene semua masih ok jgnlah tp klu sudah tahapnya overhaul, lain critalahkan
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    Post on 6/6/2008, 4:16 pm by blugu

    shalina7981 wrote:kasar/halus tu polish bagi aku utk gene semua masih ok jgnlah tp klu sudah tahapnya overhaul, lain critalahkan

    tidak difahami bahasa mu ni bro... 8)
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    Post on 6/6/2008, 11:48 pm by lentugi

    shalina7981 wrote:kasar/halus tu polish bagi aku utk gene semua masih ok jgnlah tp klu sudah tahapnya overhaul, lain critalahkan

    tejuling mata saya mo baca ni Shocked
    cuba test susun ayat nya supaya senang di baca Very Happy
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    Post on 10/6/2008, 1:36 pm by blugu

    Porting Cylinder Heads - Port or Abort?

    The worst head porting mistakes and how to avoid them!
    By David Vizard

    illustrators: George Trosley

    Pro head
    porters often say the guy who pays their bill without questioning it is
    usually one who has already tried porting and has an idea of the work
    involved. Success at head porting does not happen overnight. It takes
    skill and practice. Most beginners dive into a porting project without
    really knowing what they are doing and almost inevitably bite off more
    than they can chew.Result--disappointment and a set of
    half-finished or half-ruined heads. By following the guidelines here,
    that need not be the case. Given the right directions you can get about
    70 percent the results of a pro porting job for cents on the dollar, so
    let's look at the failure paths leading to the most common pitfalls.Be Careful
    Consider where the worst flow restriction is in the head. It is not, as
    most novice porters assume, near the intake manifold face. Check the
    basic small-block Chevy port in Figure 1 which is divided into three
    sections. Between the two arrows of the first part is a high flow zone
    of some 95-percent efficiency. The turn into and the bowl (valve
    pocket) is a medium flow zone of typically 75 percent efficiency while
    the zone into and immediately from the valve seat only averages about
    50 percent. The efficiencies of these individual sections indicate your
    port reworking priorities. Typically two-thirds of the airflow gains to
    be made from an 'as cast' head are found from a half-inch into the
    combustion chamber to about a half-inch past the port's guide boss.
    Basically this can be described as "deep pocket porting." It finds the
    fastest, easiest gains and, other than cleaning up, should represent
    the limit of your initial porting efforts.For valve lift values
    up to about 20 percent of the valve's diameter, the valve seat, and the
    approach to and from it is more important than the port itself. The
    rule here is that poor valve seat jobs produce poor results almost
    regardless of how good the port might otherwise be. Parallel two-valve
    combustion chambers, typical of American V-8s, suffer from a problem
    called valve shrouding (Figure 3). This is more common on OE heads than
    aftermarket heads. On production closed-chamber SB Chevy heads where
    valve shrouding is prominent, be aware that if larger valves are
    installed shrouding will get worse, as will flow. The installation of
    larger valves must be accompanied by a like amount of valve
    de-shrouding.

    Go Easy
    About as ambitious as you should get for your first porting job is to blend seats into the port, skinny down guide bosses and de-shroud the intake valve by about a sixteenth of an inch. After this, just clean up the rest of the ports and chambers with course emery rolls.

    Take Your Time

    Porting takes time and aluminum cuts faster than iron. Figure (with the
    recommended tools) spending about 8-12 hours on the actual porting job.
    To avoid wasting time on half a job ask yourself the following: are you
    good for completion and are the heads crack-free.

    Shape It, Don't Shine It
    Pro-ported heads often have a high shine finish, but understand that this is done to add perceived value for those with limited porting knowledge. It is
    shape not shine that makes horsepower.Use Correct Tools
    The right porting tools must be used or you will be defeated before ever
    starting. A small eighth-inch collet and an electric die-grinder is
    totally inadequate because they lack power. If you have an air
    compressor, an inexpensive air die grinder is the way to go for fast
    metal removal. Since shine is not on the agenda, only 60 and 80 grit
    emery rolls and flat pads for finish work will be needed. If no air
    access exists then (though more cumbersome and expensive) an electric
    die grinder is the answer.Although carbides are often best spun at
    15,000 -22,000 rpm, the same cannot be said for emery rolls and the
    like. For either air or electric, some form of speed reduction is
    essential. For an air-powered grinder, a cheap pressure regulator gets
    the job done. Although not intended for such, a light dimmer switch is
    a cheap and effective answer to speed control for an electric die
    grinder.Cheap high-speed steel cutters are available from many
    cut-price tool stores. Unfortunately they are totally inadequate for
    the job. In this area it is true to say that anything cheap will not
    work. Your cutters must be carbide and, while not expensive, they are
    certainly not cheap. Two places that have excellent prices and cutters
    explicitly for cutting heads are CHA (Cylinder Head Abrasives) and
    Roger Helgesen. The porting mods described here need only two or three
    cutters to get the job done. These are a three-eighths and half-inch
    olive and a three-eighths ball. For cast iron, you will need a
    fine-tooth form and for aluminum a course tooth. To reduce cutters
    loading up when working aluminum, a kerosene/WD-40 mix can be used, but
    to completely eliminate loading and to speed cutting, the special fluid
    sold by Roger Helgesen is the choice of pros.Chamber reworking calls
    for seat protection. This is best done utilizing valves of the
    appropriate size having the seats ground with only a few thousands
    margin left for a near flush fit in the chamber.Machining
    Unless you intend to rework a pair of new heads, do not overlook the fact they may need machine work done. If the CR is to be raised while retaining
    the pistons currently in the motor then, even new heads, will need at
    least a milling operation. The most likely job that will have to be
    done on an OE head is a new valve seat job, but there are exceptions.
    Some factory existing seat jobs are sufficiently wide (an eighth inch)
    to allow the inside edge to be radiused into the port body. If so then
    a new seat job is not essential. If the heads being reworked are used,
    then they may require face milling to true them up. Your machine shop
    can check this out for you with a machinist's straight edge. If you are
    looking for more compression then the head can usually be faced 40-60
    thousandths-if the casting is good for it. However, doing so will mean
    the intake manifold will have to be machined to realign the ports.

    Guides Are Critical

    If the guides are worn or the seat design is far removed from a 3-angle
    pattern or is worn, then a guide job and seat re-cutting will be
    mandatory. Be aware that worn guides can cost as much as 10-15 hp and
    can also lead to the head coming off the valve. Do not use guide
    knurling as a fix for worn guides as this does not last and compromises
    exhaust valve stem heat transfer. Just bite the bullet on this one and
    go for new cast-iron or bronze guides as it will pay off.

    Safety First

    A carbide cutter driven at high speed means high-speed chips of metal
    flying around. If you do not protect your eyes with safety glasses, a
    hospital visit is an absolute certainty. When it comes time to use
    emery on your head casting, be sure to wear a mask to filter out the
    dust and metal particles. Even short exposure times can cause
    respiratory problems. To assist keeping the air you breath and that
    around your workspace clean, use a shop vac to s*c* the work debris
    directly out of the ports as you work.

    Keep It Clean
    After grinding a couple of sets of heads in a work area, getting rid of the
    resulting grit and metal dust is a major job. Use an enclosed workspace
    that is completely separate from wherever you may subsequently build
    your engine.

    Testing Your Work

    The porting moves described so far are almost 100 percent certain to work, so a flow bench is not needed to get results, only to quantify them. If the
    intent is airflow optimization, the situation changes and a method of
    measuring flow becomes essential. A big 'main frame' flow bench such as
    the Super Flow 600 used here may ultimately be what you want. However,
    it is possible to get into a surprisingly accurate, entry-level,
    shop-vac powered flow bench for as little as $800.

    Results

    By porting your heads and observing our 10 "don'ts," how much extra
    flow and power can you expect? You've seen what was achieved when the
    techniques described were applied to a set of World Products Chevy
    Sportsman II heads. The result, on motors of 350 inches or more is 45
    (or more) extra hp. Similar porting exercises on 5.0 small-block Ford
    can show an additional 25-30hp.

    Spoiler:







    Hits the spoiler for some PORTING picture to share
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    Post on 11/6/2008, 8:40 am by shalina7981

    sorry bro-2 sekalina ayat aku tu tak tersusun hari tu...sambil kerja sambil taip kat forum ni..maaf saya tak sedar apa yg di taip tu...(kelam kabut)maaf...........
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    Post on 26/7/2008, 3:43 am by blugu

    DIY A Porting Job

    GUIDES TO HIGHER LEARNING

    Free instructions for your automotive projects! CLICK ON EACH FOR INSTRUCTIONS.

    Gasket Removal
    HTML PDF

    Basic Cylinder Head Porting
    HTML PDF

    Engine Block Preparation
    HTML PDF


    Last edited by blugu on 26/7/2008, 3:53 am; edited 2 times in total
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    Post on 26/7/2008, 3:51 am by Ujang87

    Fuh!!!mau sa P&P ni..sa test tanya mekanik sa ni..hahaha..tq for info BLUGU,, Very Happy
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    Post on 26/7/2008, 6:49 am by te37

    mataiiii la ujang ni..kena bakar...hahahah..
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    Post on 26/7/2008, 12:45 pm by xiaomao

    Port and polish dgn overhaul tidak sama kah?
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    Post on 27/7/2008, 2:16 am by blugu

    xiaomao wrote:Port and polish dgn overhaul tidak sama kah?

    Berbezala bro, Top Overhaul cuma mengganti part≤ kepada yg baru sahaja, Porting adalah salah satu cara modified, membesarkan lubang≤ intake & outake
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    Post on 27/7/2008, 3:34 am by Ujang87

    te37 wrote:mataiiii la ujang ni..kena bakar...hahahah..
    Bkn kna bakar bah bro..kekekeke..mau bakar bah..hahaha Very Happy
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    Post on 27/7/2008, 4:43 am by xiaomao

    blugu wrote:
    xiaomao wrote:Port and polish dgn overhaul tidak sama kah?

    Berbezala bro, Top Overhaul cuma mengganti part≤ kepada yg baru sahaja, Porting adalah salah satu cara modified, membesarkan lubang≤ intake & outake

    kalao general overhaul tu lain lagi ka?

    Post on 27/7/2008, 4:57 am by ProjectD

    lau general tu maksudnya kacau sampai block injin sudah,mcm tukar ring,conrod bearing dll.....kalau bawah x kacau,cuma head jak kcu tu Top ovhl.....


    Last edited by ProjectD on 25/9/2008, 9:22 am; edited 1 time in total
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    Post on 9/8/2008, 2:09 am by blugu

    xiaomao wrote:
    blugu wrote:
    xiaomao wrote:Port and polish dgn overhaul tidak sama kah?

    Berbezala bro, Top Overhaul cuma mengganti part≤ kepada yg baru sahaja, Porting adalah salah satu cara modified, membesarkan lubang≤ intake & outake

    kalao general overhaul tu lain lagi ka?

    General O/Haul ini umpama servis utk komponen dalaman enjin, maksudnya... semua bearing, seal & ring2 bahagian dalam enjin diganti baru, samada komponen tersebut adalah tulen, campalang/cikai ataupun performance, tepuk poket samada tebal atau nipis, terpulang dgn anda utk option yang terbaik utk enjin anda.
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    Post on 9/8/2008, 2:11 am by blugu

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    Post on 17/9/2008, 6:32 am by DeDiCooL

    emm, macam mana pula kalau porting lubang valve kasi masuk oversize valve? ada engineering yang sanggup bikin ni ka di kk?

    extra air flow + extra fuel = extra hp ?

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