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Thread: MPX additional porting. MAMMOTH inlet!

  1. #316
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    But not great for a 4000mile engine.
    1994 Supercoupe 5spd Custom, first to buy a 2.1L Big Bore Kenne Bell Twin Screw for an SC
    Old numbers on 1.7l AR SC: 415WHP off the bottle-12.2535 @112.18 off the bottle. Best TQ to date 516ft/lbs, New numbers 480whp on dream crusher.
    1990 35th 5spd 2011 Carlisle 1st place class winner. 12.9@108MPH 1.9
    2013 GT/CS 5.0L FRPP 2.3l Whipplecharged family weekend car
    2005 SAAB 9-3 Aero 2.0L TURBO Work Mule

  2. #317
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    Well then it isn't even broke in yet.
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    Bettie Riding jack stands
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  3. #318
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    I'm going to do a comp test on my blue car. Wish me luck if that engine is hurt there will be some parts for sale in the classifieds. Two broken SC is too fancy for my wallet.
    1994 Supercoupe 5spd Custom, first to buy a 2.1L Big Bore Kenne Bell Twin Screw for an SC
    Old numbers on 1.7l AR SC: 415WHP off the bottle-12.2535 @112.18 off the bottle. Best TQ to date 516ft/lbs, New numbers 480whp on dream crusher.
    1990 35th 5spd 2011 Carlisle 1st place class winner. 12.9@108MPH 1.9
    2013 GT/CS 5.0L FRPP 2.3l Whipplecharged family weekend car
    2005 SAAB 9-3 Aero 2.0L TURBO Work Mule

  4. #319
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    Quote Originally Posted by BLOWN38 View Post
    Well then it isn't even broke in yet.
    it might have more than 4k less than 10k for sure.

    Lets see, Carlisle once and shootout twice and a few more miles around my neck of the woods.
    1994 Supercoupe 5spd Custom, first to buy a 2.1L Big Bore Kenne Bell Twin Screw for an SC
    Old numbers on 1.7l AR SC: 415WHP off the bottle-12.2535 @112.18 off the bottle. Best TQ to date 516ft/lbs, New numbers 480whp on dream crusher.
    1990 35th 5spd 2011 Carlisle 1st place class winner. 12.9@108MPH 1.9
    2013 GT/CS 5.0L FRPP 2.3l Whipplecharged family weekend car
    2005 SAAB 9-3 Aero 2.0L TURBO Work Mule

  5. #320
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    When you did the test.... did you remove the rockers to insure the valves stay closed when the air pressure pushes the piston to the bottom of the cylinder ?
    1991 SC AOD 4.2..2.3 Whipple..........10.910 @ 125.61
    2016 SRT Challenger Hellcat...............707HP/650TQ

    My Garage

  6. #321
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    Quote Originally Posted by David Neibert View Post
    When you did the test.... did you remove the rockers to insure the valves stay closed when the air pressure pushes the piston to the bottom of the cylinder ?
    Lets just say a highly regarded engine builder did the test. I was not involved in the procedure.


    For the test im about to do to the blue car tonight, rockers are off!
    I just need to know if it matters that the engine has not been ran in over two years, and oil has settled down to the bottom and if it matters the position of the piston, I dont want to rotate the engine.
    1994 Supercoupe 5spd Custom, first to buy a 2.1L Big Bore Kenne Bell Twin Screw for an SC
    Old numbers on 1.7l AR SC: 415WHP off the bottle-12.2535 @112.18 off the bottle. Best TQ to date 516ft/lbs, New numbers 480whp on dream crusher.
    1990 35th 5spd 2011 Carlisle 1st place class winner. 12.9@108MPH 1.9
    2013 GT/CS 5.0L FRPP 2.3l Whipplecharged family weekend car
    2005 SAAB 9-3 Aero 2.0L TURBO Work Mule

  7. #322
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    This is a good time to talk about leakdown testers.

    How are you supposed to do it? What is adequate pressure and adequate leakdown. David, is it easy to see/feel the air coming up through the valve? I want to try this on one of my ATC110 engines and have a tester, just never messed with it.

  8. #323
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    Quote Originally Posted by ricardoa1 View Post
    Lets just say a highly regarded engine builder did the test. I was not involved in the procedure.


    For the test im about to do to the blue car tonight, rockers are off!
    I just need to know if it matters that the engine has not been ran in over two years, and oil has settled down to the bottom and if it matters the position of the piston, I dont want to rotate the engine.
    Are you doing compression or leak down on the blue car? If its compression you have to turn it over and the valves would have to move to let air into the cylinder.

    If leak down then you can just do it as is with the pistons where they are if all the rockers are loose. You may want to fix the crank with something or it will likely move when you get to a cylinderthat is on the up or down stroke. It won't hurt anything if it moves tho.
    Last edited by BLOWN38; 12-30-2013 at 06:19 PM.
    ~Chris
    SCCoA Member #1826
    Bettie Riding jack stands
    SCARlet on drag duty now

  9. #324
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    Quote Originally Posted by Micahdogg View Post
    This is a good time to talk about leakdown testers.

    How are you supposed to do it? What is adequate pressure and adequate leakdown. David, is it easy to see/feel the air coming up through the valve? I want to try this on one of my ATC110 engines and have a tester, just never messed with it.
    The left gauge on the tester shows your input pressure from the compressor and the right gauge is the input pressure less the air that is leaking past something. So a good number to have your input pressure at is 100 psi so that it is easy to calculate the percentage leaking. If you have a tester like I posted it tells you the percent. EDIT You also need to equalize the 2nd gauge to the 1st gauge before you hook the tester to the cylinder.

    If you are doing a 2 stroke motor you will want to hold the crank so it doesn't turn and will want the piston at the top of the cylinder. On a 4 stroke you want the compression stroke and you should also keep the crank from moving unless the rockers are off so the valves stay closed.
    Last edited by BLOWN38; 12-30-2013 at 06:27 PM.
    ~Chris
    SCCoA Member #1826
    Bettie Riding jack stands
    SCARlet on drag duty now

  10. #325
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    Here are the instructions for my tester.
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    ~Chris
    SCCoA Member #1826
    Bettie Riding jack stands
    SCARlet on drag duty now

  11. #326
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    Quote Originally Posted by BLOWN38 View Post
    Are you doing compression or leak down on the blue car? If its compression you have to turn it over and the valves would have to move to let air into the cylinder.

    If leak down then you can just do it as is with the pistons where they are if all the rockers are loose. You may want to fix the crank with something or it will likely move when you get to a cylinderthat is on the up or down stroke. It won't hurt anything if it moves tho.
    Chris I was saying I don't know the Annie engine was tested, but im sure it was done correctly

    As for me I have a clue but I am uncertain if the engine needed be lubed up or something stupid. When I did the leak down test on the #3 cylinder trying to find the sludgy spark plug issue the test went fine. Little did I know the number two bank was the real problem. It makes sense because of the excessive oil build up in the manifold and intake track. Which # 3 cylinder gets to ingest first. But a full analysis will come much later after a teardown.

    Ok enough typing let me get my compressor started.
    1994 Supercoupe 5spd Custom, first to buy a 2.1L Big Bore Kenne Bell Twin Screw for an SC
    Old numbers on 1.7l AR SC: 415WHP off the bottle-12.2535 @112.18 off the bottle. Best TQ to date 516ft/lbs, New numbers 480whp on dream crusher.
    1990 35th 5spd 2011 Carlisle 1st place class winner. 12.9@108MPH 1.9
    2013 GT/CS 5.0L FRPP 2.3l Whipplecharged family weekend car
    2005 SAAB 9-3 Aero 2.0L TURBO Work Mule

  12. #327
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    also, cold engines will have more leakage than warm engines. Forged piston engines will have more leakage than Cast or Hyper pistons.

    The goal is consistent numbers for all cylinders more than a particular number. Problems are indicated by variations cylinder to cylinder. Adjustable valves with loose adjusters can easily show issues on leakage and compression tests and KOER cylinder balance tests.

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