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  1. #1
    Nismo Super GT
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    Default Autech Camshaft Specs

    Gday All

    I recently got a set of Genuine AUtech SR20DE cams profiled.

    Here are the results:


    Lift on the lobe at TDC on overlap is 7.08mm. Rocker ratio of 1.6 gives us 11.38MM worth of actual lift.

    Centerline is roughly .5/.6

    Advertised valve timing @ .050"
    Inlet Opening: 115.6 BTDC
    Inlet Close -64.3 ABDC
    Exhaust Opens -64.3 BBDC
    Exhaust Opens 115.6 ATDC


    With this cam, and 11.5:1 compression you would exepect to see about 190PSI of cylinder cranking pressure. Dynamic compression ratio will be somewhere near 9.2:1 taking into account duration etc

    With cam gears you could easily play around with the motor and gain around 3% extra compression, but that sort of thing should be left to a workshop and dyno's to see how it all runs.
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  2. #2
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    Default

    Interesting. First I've seen of anyone posting the Autech cam profile specs, EVER.
    SR20DEEPMD
    '12 Subaru Legacy

  3. #3
    Nismo Super GT
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    Default

    Quote Originally Posted by TeKKiE View Post
    Interesting. First I've seen of anyone posting the Autech cam profile specs, EVER.
    Well after purchasing the car 2 years ago, i made it my goal to find out exactly what is done to the autech motor. For a "factoryish" setup (ie modified but form factory) their a tough motor, and the engine certainly has a lot more driveable torque than most other cammed DE's.

  4. #4
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    Default

    I saw a 190psi with my s4's and I am thinking I do have a 10.1 compression motor according to this link. check it out!
    http://www.sr20forum.com/sr20de-tech...-sr20de-2.html

    also have you done a compression check on yours?

  5. #5
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    Quote Originally Posted by ser007 View Post
    I saw a 190psi with my s4's and I am thinking I do have a 10.1 compression motor according to this link. check it out!
    http://www.sr20forum.com/sr20de-tech...-sr20de-2.html

    also have you done a compression check on yours?
    ^Huh,

    Well g'day mate,

    It is good to see the specs for an Autech cam, gives a good guideline for setting up any other lumpy cam and to have a sensible starting point.

    Mike

  6. #6
    Jah Guide
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    Quote Originally Posted by Autech View Post
    Well after purchasing the car 2 years ago, i made it my goal to find out exactly what is done to the autech motor. For a "factoryish" setup (ie modified but form factory) their a tough motor, and the engine certainly has a lot more driveable torque than most other cammed DE's.

    Well it is obvious that the Autech motor would have more drivability torque than most cammed SR20s. Why you ask? Well Autech has 11.5 to 1 compression and most SR20DEs are 9.5 or 10 to 1 compression. 1.5-2 points in compression is alot.
    Good Thoughts Bring Good Vibes Which Bring Good Reasoning

    I Am A JWT Dealer And VRS Dealer.

    If you need any help 305-282-3643

    I sell SR20VE, SR20DE and SR20DET motors

  7. #7
    Nismo Super GT
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    Quote Originally Posted by Andreas Miko View Post
    Well it is obvious that the Autech motor would have more drivability torque than most cammed SR20s. Why you ask? Well Autech has 11.5 to 1 compression and most SR20DEs are 9.5 or 10 to 1 compression. 1.5-2 points in compression is alot.
    Yes that is right.

    But most cammed DE motor we have over here, dont hold on up top as well as down low as this does. This has been refelected ont he dyno.


    There were once rumour the DE autech head had portwrok done, do you know if this is correct Andreas?

  8. #8
    Jah Guide
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    I have no clue if the head has been ported.
    Good Thoughts Bring Good Vibes Which Bring Good Reasoning

    I Am A JWT Dealer And VRS Dealer.

    If you need any help 305-282-3643

    I sell SR20VE, SR20DE and SR20DET motors

  9. #9
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    What piston does an Autech use?

    Mike

  10. #10
    Pulsar SSS N/A
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    Default

    sr16ve..

  11. #11
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    Quote Originally Posted by vumnoo View Post
    sr16ve..
    That would be about 12.8:1, I just looked at my spreadsheet, it has to be the SR16V N1 piston with a 6.6 cc dome.

    Mike

  12. #12
    Nismo Super GT
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    Quote Originally Posted by UK-SRi View Post
    That would be about 12.8:1, I just looked at my spreadsheet, it has to be the SR16V N1 piston with a 6.6 cc dome.

    Mike
    O_o

    Every bit of info that we ever read on the old SR20 forum always stated that their sr16 pistons as thats the only way to achieve this comp....

  13. #13
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    I will go back to the spreadsheet and check the cells are calculating the right things then.

    Regards,

    Mike

 

 

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