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Thread: cam profile mod gains

  1. #31
    Junior Member Domestic Engineer
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    Default Re: cam profile mod gains

    I was just guessing =P I figured the less space between the valve and bore wall the less flow... hehe.
    My Daily: NooB's Delivery Vehicle
    My wife's Daily: Series B RA40 Liftback 22RE, power steering, AC. Cushy as.
    Current Project: NooB 3TGTE swap
    Back Burner: 1964 Toyopet ToyoAce, and a Series B TA45 GT coupe
    Too many cars

  2. #32
    Junior Member Grease Monkey
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    Default Re: cam profile mod gains

    Quote Originally Posted by J-M kujala View Post
    Depends. There is different springs/age and different km:s behind them

    Weakest double springs was 17kg at intake side !! What i have measure. Up to ~30kg (seat pressure)
    .
    Can please let me know how to measure the spring force?

  3. #33
    Junior Member Backyard Mechanic J-M kujala's Avatar
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    Default Re: cam profile mod gains

    Quote Originally Posted by metcap View Post
    Can please let me know how to measure the spring force?
    Just buy a valve spring load test bench. Or weight scale what is made to use in that purpose with hydraulic press or with bench drill.

    Classic personal weight scale can use also, but usually had to add some sheet metal over scale to stop bending the scale cover.

    Rates are measured install height, and open. = install height + lift.


    To that 2TG valve clearance to bore, its faaar away... There is squish ;-) like ~5mm. And with same size bore than combustion chamber, the valve is in angle, so its not cut flow. 2valve real hemis always accept as big as possible, but if that needed, depends at some other things also. With stock intake ports.. No needed.
    - Celica TA-22 -74 2T-G Turbo
    - IQ 1.0 -09
    - Lexus IS250 -06

  4. #34
    Junior Member Grease Monkey
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    Default Re: cam profile mod gains

    Hi Mate,



    Sorry for the late reply, I have the specs now.



    Spring height 1.85”

    OD of Outer spring 1.325”

    ID of inner spring .710”

    Seat Pressure 1.650:65 & 1.530:95

    Open Pressure 1.160:220 & 1.100:240

    Coil Bind .895

    V.S.I Shim 302



    I hope this helps.
    Ok guys here are the spring specs I got from Sleeka Spares, what does it all mean?

  5. #35
    Junior Member Backyard Mechanic J-M kujala's Avatar
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    Default Re: cam profile mod gains

    Spring height in inches & rated pressure Lbs

    A lot stiffer than stock ones,
    - Celica TA-22 -74 2T-G Turbo
    - IQ 1.0 -09
    - Lexus IS250 -06

  6. #36
    Junior Member Grease Monkey styler's Avatar
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    Default Re: cam profile mod gains

    What that means is RR4's, 310lbs/inch as in the best springs for 2tg/3tgeu/3tgeu.
    Don't bother with any others they are the shizzle or go look at other specs if you like...

  7. #37
    Junior Member Grease Monkey styler's Avatar
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    Default Re: cam profile mod gains

    Camshaft duration is all about the Lift @ Duration not the "Advertised duration"
    If you look at charts of Lift/Duration you will see the difference.
    Will leave it at that.

  8. #38
    Junior Member Grease Monkey
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    Default Re: cam profile mod gains

    Quote Originally Posted by J-M kujala View Post
    Spring height in inches & rated pressure Lbs

    A lot stiffer than stock ones,
    Ok I understand spring height but please explain Seat Pressure 1.650:65 & 1.530:95, Open Pressure 1.160:220 & 1.100:240

    And excuse my dumbness but what is RR4?

  9. #39
    Junior Member Grease Monkey styler's Avatar
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    Default Re: cam profile mod gains

    It's a part number of performance springs.
    Have sussed out other spring manufactrures "but to no avail"

    Means as you say:

    1.650"inch at 65 lbs per inch
    1.100"inch at 240 lbs per inch

    What is your cam lift?

    0.400"?
    0.410"?
    0.420"?

  10. #40
    Junior Member Grease Monkey styler's Avatar
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    Default Re: cam profile mod gains

    Lets just say RR4's are great lb's / inch and good coil bind rate.

  11. #41
    Junior Member Backyard Mechanic J-M kujala's Avatar
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    Default Re: cam profile mod gains

    This calculator give good info ... just need to know all these details...

    http://dairally.net/daihard/chas/Mis...alveSpring.htm
    - Celica TA-22 -74 2T-G Turbo
    - IQ 1.0 -09
    - Lexus IS250 -06

  12. #42
    Olde mechanic Carport Converter oldeskewltoy's Avatar
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    Default Re: cam profile mod gains

    Quote Originally Posted by andrew_mx83 View Post
    ive never seen the logic in using oversize valves unless the seats are bored out or replaced with larger ones to suit. as you say if anything OS valves on stock seats would seem to impede flow.
    In a 4AGE you will get one advantage using O/S valves on machined, but otherwise stock seats.... the first .100" of lift you will SUBSTANTIALLY improve flow... but the advantage goes away quickly.

    The reason you can't just open up a stock seat to O/S specs is there would not be enough seat left for the head to retain. It would be likely that the seat would not last.

    Information is POWER... learn the facts!!

  13. #43
    Junior Member Backyard Mechanic gixer's Avatar
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    Default Re: cam profile mod gains

    Quote Originally Posted by oldeskewltoy View Post
    don't forget the head has to be capable to flow...

    A stock head will often hit a wall where it just stops flowing more... So cams only tell part of the story.

    for example... 4AG head... without proper porting, there is little reason to run lifts much above stock, but with proper porting....
    Well said, I have flow benched many 4AGE heads, 16v and 20v, when selecting a cam, the first thing I do is flow bench the head, no point putting 11.00mm lift cams in, if the head runs flat at 8.00mm, once I have got the lift worked out, then it's onto the duration depending on what sort of rev range is required.

    It amazes me how many people port their heads without doing a before and after on a flow bench, it's rare I see someone do a before and after and actually get a gain, some heads look awesome but flow worse than standard.

  14. #44
    Junior Member Automotive Encyclopaedia
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    Default Re: cam profile mod gains

    i go for more lift if its shim under and stay around 250 to 260 duration at 50 thou ,cams with to fat a nose are getting up there any cam after 265 duration at 50 thou is going on full race cam

  15. #45
    Olde mechanic Carport Converter oldeskewltoy's Avatar
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    Default Re: cam profile mod gains

    Quote Originally Posted by gixer View Post

    It amazes me how many people port their heads without doing a before and after on a flow bench, it's rare I see someone do a before and after and actually get a gain, some heads look awesome but flow worse than standard.



    I have to admit I don't do it all the time...
    Information is POWER... learn the facts!!

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