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Author Topic: Stelanje - tajming bregastog vratila  (Read 4813 times)
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Robi
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« Reply #15 on: September 04, 2007, 08:01:49 PM »

pa smanji overlap, sta je to tolka filozofija? obican
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Zeljko
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« Reply #16 on: September 05, 2007, 06:42:27 AM »

nisam ja vec dobrim djelom iz teksta pjesme josipe lisac
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The First, DASTEK UNICHIP TECHNICALLY THE BEST; If you need more POWER, you need more AIR(cmf)
gonzohr
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« Reply #17 on: September 06, 2007, 11:21:34 AM »

evo alfa moda ti ovo malo pomogne
http://www.alcester-racing-sevens.com/cam_timing.htm
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ALFALUDjAK
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« Reply #18 on: September 06, 2007, 11:36:39 AM »

jebeno!!! ::::::


ali ja neznam engleski :::ljutko:
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gonzohr
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« Reply #19 on: September 06, 2007, 11:42:08 AM »

o na njemački:Crash:
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« Reply #20 on: September 06, 2007, 11:43:43 AM »

evo ti jo jedan jednostavniji
http://www.max-boost.co.uk/max-boost/cylhead/cams_C20LET.htm
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Zeljko
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« Reply #21 on: September 06, 2007, 12:07:35 PM »

ma to je sve bezveze... to su "filozofije" to se ide odokativnom metodom strucnije... oko puta pi
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The First, DASTEK UNICHIP TECHNICALLY THE BEST; If you need more POWER, you need more AIR(cmf)
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« Reply #22 on: October 05, 2007, 08:09:49 PM »

Evo diagrama kako bi to izgeldalo na mjerenju ukoliko tajming bregaste je pravilan, retardiran ili advansiran.
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The First, DASTEK UNICHIP TECHNICALLY THE BEST; If you need more POWER, you need more AIR(cmf)
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« Reply #23 on: October 05, 2007, 08:14:37 PM »

Quote
Originally posted by gonzohr
evo ti jo jedan jednostavniji
http://www.max-boost.co.uk/max-boost/cylhead/cams_C20LET.htm


Dobra stranica.
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fire
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« Reply #24 on: October 05, 2007, 09:12:05 PM »

Nebi na grafu crveni trebao biti malo veci od plavog na niskim okretajima? I nebi vrh zelenog trebao biti iznad vrha plavog(znaci veca vrijednost)?
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« Reply #25 on: October 05, 2007, 09:19:54 PM »

Uvjeri se sam...
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sime
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« Reply #26 on: November 01, 2007, 12:07:20 PM »

Ako imate bregastu o  kojoj neznate nista  onda je ugradite ( tu mislim za SOHC motor ali isto je za svaki) i prvo izmerite komparatorom otvaranje usisnog ventila u TDC  onda se prebacite i izmerite visinu izduvnog  i sakupite obe vrednosti i podelite na 5 dela  3 dela stavite da otvara usisni a 2 dela izduvni to je mozda idealno ali moze treba i malo jos podesiti. + - ali za bregastu o kojoj nemate pojma netreba misliti da je nemoze ustelati .....
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« Reply #27 on: January 23, 2011, 10:16:05 PM »

Calculating Overlap
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    At the end of the exhaust stroke and the beginning of the intake stroke both the intake and exhaust valves are open at the same time. This period of time (in degrees) is know as the Overlap Period. The overlap period has a profound influence on the running characteristics of the engine. It effects both the low speed and high speed characteristics the engine.

    There are a couple different ways to calculate the overlap of the cam.

    1) The easiest way is to add the intake opening times to the exhaust closing time. Seat to seat times (advertised duration) must be used. .050" durations or timings will not give the correct overlap.

    Example:
    Comp Cams EX268H
    Adv dur: int 268, exh 280
    110 LSA, 106 ILC (4 advance)
    Valve timing @ .006"
    intake opens @ 28 BTDC
    Intake closes @ 60 ABDC
    Exhaust opens @ 76 BBDC
    Exhaust closes @ 26 ATDC

    In this example the overlap is 54 (28+26)
     

    2) If the seat to seat opening and closing times are not known, the overlap can be calculated using the advertised duration and the Lobe Separation Angle (LSA). This formula works for both single and dual pattern cams.

    Add the intake and exhaust adv durations
    Divide the results by 4
    Subtract the LSA
    Multiply the results by 2

    Using the example cam above:
    268+280=548
    548/4=137
    137-110=27
    27*2=54
    The overlap is 54
     

    Here's another example:
    Comp Cams XE294H
    Adv Dur: int 294, exh 306
    110 LSA, 106 ILC (4 advance)
    Valve timing @ .006"
    Int opens @ 41 BTDC
    Int closes @ 73 ABDC
    Exh opens @ 87 BBDC
    Exh closes @ 39 ATDC

    Adding the int open and exh close times (41+39) the overlap is 80

    Using the formula above:
    294+306=600
    600/4=150
    150-110=40
    40*2=80
    The overlap is 80
     

    These are the valve timing overlap ranges that are most likely to work correctly (thanks to David Vizard for providing this):
                           trucks/good mileage towing 10-35 degs overlap
                           daily driven low rpm performance 30-55degs overlap
                           hot street performance 50-75 degs overlap
                           bracket/oval track racing 70-95degs overlap
                           dragster/comp eliminator engines 90-115 degs overlap

    As you can see the XE268H cam falls at the top of the daily range and the bottom of the hot street range. It will have a civil but noticeable idle with good vacuum. The XE294H cam is in the middle of the bracket/oval track range. It has a radical idle and low vacuum.
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The First, DASTEK UNICHIP TECHNICALLY THE BEST; If you need more POWER, you need more AIR(cmf)
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