Register now to get rid of these ads!

What the heck is a whistle test?

Discussion in 'The Hokey Ass Message Board' started by motion corvette, Nov 26, 2012.

  1. motion corvette
    Joined: Aug 29, 2012
    Posts: 32

    motion corvette
    Member
    from CT

    Ok maybe I am to young to have heard this term used before? Has anyone ever heard this term to diagnose an engine?
     
  2. I've never heard that term before. I'm guessing it has something to do with vacuum? Enlighten us, if you know.
     
  3. theHIGHLANDER
    Joined: Jun 3, 2005
    Posts: 7,554

    theHIGHLANDER
    Member

    I think if the car's right you get away with whistling at women. Just a guess...
     
  4. motion corvette
    Joined: Aug 29, 2012
    Posts: 32

    motion corvette
    Member
    from CT

    Guy at work was talking about a car he built and mentioned he had done this. Trying to figure out what the guy is talking about. I have not a clue what the test would be for.
     
    Register now to get rid of these ads!

  5. Zerk
    Joined: May 26, 2005
    Posts: 1,419

    Zerk
    Member

    Heard of a whistle used to find TDC. Not that popular and I'd guess not real precise.
     
  6. tb33anda3rd
    Joined: Oct 8, 2010
    Posts: 14,171

    tb33anda3rd
    ALLIANCE MEMBER
    1. Connecticut HAMB'ers

  7. The only thing that comes when I whistle is the dog:mad:

    Maybe this
    COMPRESSION COMPARISON

    How does a cylinder leakage test differ from a conventional compression test? Instead of checking how well each cylinder pumps air, a cylinder-leakage test checks each cylinder's ability to hold air.

    The sequence for cylinder leakage is testing is virtually the same for all engines. The engine should be warmed up first because a cold engine allows more blow-by gases than a hot one.

    Remove the air cleaner and prop the throttle open. This makes it easier for you to hear if air is leaking into the intake manifold.Remove the oil-filler cap, pull the PCV valve out of its grommet (if equipped) and let it hang off to the side. Relocating the valve prevents air that may leak into the crankcase from traveling back into the intake manifold, which could mislead you into thinking the engine has a bad intake valve.Using extreme care, release the pressure from the radiator by slightly loosening the cap, then remove it and top off the radiator with coolant. Removing the cap lets you see if any bubbles rise during the leakage test, a sign that air is leaking into the cooling system.Remove the spark plug from the cylinder to be tested. It's up to you to pull as many plugs as you want to.Disable the ignition system by disconnecting and grounding the coil wire. On engines with distributorless ignition, disconnect the ignition coil primary supply to the coil pack.Turn the engine over (manually or with the starter and ignition disabled) until the piston in the cylinder to be tested is at top dead center on its compression stroke. The piston must be at TDC for three reasons: a) so the valves are closed, b) to position the rings at the most worn part of the cylinder, and c) to prevent the piston from being shoved back down by the compressed air.There are a number of ways to find TDC, but the easiest way that works for all cylinders and engines is to use the engine's ability to pump air. Thread the adaptor hose into the cylinder you're going to test and connect a whistle to the end of the adapter. If you don't have a whistle handy, hold your thumb over the adapter's end. Turn the engine over (bumping the starter with a remote switch works nicely) just until you hear the whistle start to blow or air come out of the end of the adapter. Slowly turn the engine to the point where the whistle (or air) just stops. This is TDC. You may have to try this trick a few times to get the hang of it, but it saves a lot of time compared to figuring out TDC by degrees.Connect the leakage tester to your shop's air supply. Follow the equipment maker's recommendations for maximum inlet air pressure. Then, zero the gauge with the adjustment knob.Connect the tester's outlet hose to the adapter and read the leakage on the gauge. If the crankshaft turns when you feed compressed air into the cylinder, reposition it back to TDC and prevent the crank from turning by holding it with a wrench. Leaving the other spark plugs in place will lessen the odds of this happening.
    REASONING WITH READINGS
     
  8. motion corvette
    Joined: Aug 29, 2012
    Posts: 32

    motion corvette
    Member
    from CT

  9. falcongeorge
    Joined: Aug 26, 2010
    Posts: 18,499

    falcongeorge
    Member
    from BC

    yup.
     
  10. metal man
    Joined: Dec 4, 2005
    Posts: 2,950

    metal man
    Member

    Why not ask him?
     
  11. Why don't you just asking the guy using the term?

    ~Alden


    Ha! Posted at the same time as Metal man!
     
    Last edited: Nov 26, 2012
  12. motion corvette
    Joined: Aug 29, 2012
    Posts: 32

    motion corvette
    Member
    from CT

    I am thinking he made it up? Maybe fun to ask though?
     
  13. hoggyrubber
    Joined: Aug 30, 2008
    Posts: 568

    hoggyrubber
    Member

    maybe he was talking about the old grey whislte test.:D
     
  14. Bruce Lancaster
    Joined: Oct 9, 2001
    Posts: 21,547

    Bruce Lancaster
    ALLIANCE MEMBER

    Dim memory here, but wasn't one of the early methods used by NHRA to try to determine displacement without a teardown called the whistle test??
     
  15. Dick's Beaters
    Joined: Apr 27, 2008
    Posts: 203

    Dick's Beaters
    Member

    Used to tell the FNGs to check out aircraft engines with the echo test. They would yell "echo" into the engine intake and another would listen to the exhaust for the "echo." If they raised the B.S. flag, they were good to go, if they were yelling at an engine, everyone would have a laugh and then they'd be let in on the joke. Not as mean as sheetmetal guys handing their cherries a quarter and sending them out to find "hollow" rivits.

    If the test involves you whistleing in any way shape or form, it's B.S.
     
  16. motion corvette
    Joined: Aug 29, 2012
    Posts: 32

    motion corvette
    Member
    from CT

    Ah, like a lefthanded screwdriver, a bucket of purple steam and a pocket Bridgeport machine?
     
  17. B.A.KING
    Joined: Apr 6, 2005
    Posts: 3,409

    B.A.KING
    Member

    ^^^^^ this
     

  18. and a gallon of prop wash and 50' of flight line.
     
  19. motion corvette
    Joined: Aug 29, 2012
    Posts: 32

    motion corvette
    Member
    from CT

    Thank you!! The guy did run cars waaay back in his day...
     
  20. uneasyrider
    Joined: Sep 23, 2012
    Posts: 163

    uneasyrider
    Member

    Oh! Where I work I think that would be a "Take cover" alarm. :D I guess I'm on the wrong topic. lol
     
  21. motion corvette
    Joined: Aug 29, 2012
    Posts: 32

    motion corvette
    Member
    from CT

    Thanks!
     
  22. snaptwo
    Joined: Apr 25, 2011
    Posts: 696

    snaptwo
    Member

    I believe the "whistle" test only involves engines with either a dispop convertor or a left handed homosonard valve. I was racing when NHRA decided to use the P&G CID tester, guys were drilling teeny holes in the header tubes and proping the exhaust valve off its seat using a piece of broomstraw. Just confused the heck out of the techs. When asked about the teeny holes , we used the excuse of checking the flame color in the exhaust.
     
  23. Hotrod95
    Joined: Jun 15, 2009
    Posts: 1,136

    Hotrod95
    Member

    It's basically sayin, if your motor whistle will call girls like when you whistle for a dog


    Posted from the TJJ App for iPhone & iPad
     
  24. raengines
    Joined: Nov 6, 2010
    Posts: 227

    raengines
    Member
    from pa.

    Last edited: Nov 27, 2012
  25. Normbc9
    Joined: Apr 20, 2011
    Posts: 1,123

    Normbc9
    Member

    I am a fireman and the primers on our Centrifugal fire pumps has a "Whistle Valve" as a part of the assembly. These primers are driven by an 8 volt starter motor receiving 12 volts. They reduce the vacuum in the hard rubber "Suction Hose." We have a gauge on the pump operators panel that reads Vacuum and when it dips into the negative readings we know we have primed the fire pump with water. I have a Fairbanks Morse single jack motor powering a pump on our ranch. It too has a "Whistle Valve." Could this be what you were thinking about?
    Normbc9
     
  26. 28dreyer
    Joined: Jan 23, 2008
    Posts: 1,063

    28dreyer
    Member
    from Minnesota

    From the manufacturers info on the link

    ..."Enter the number of cylinders, CID, and temperature of the engine...

    I'd sure like someone to explain what the number of cylinders has to do with compression ratio.
     
  27. firingorder1
    Joined: Dec 15, 2006
    Posts: 2,131

    firingorder1
    Member

    Used enjoy that show when I was in Ireland. Miss old buck tooth.
     
  28. sickboi55
    Joined: Aug 14, 2005
    Posts: 25

    sickboi55
    Member

    you use an I.D.10T form
     
  29. Toymaker
    Joined: Mar 26, 2006
    Posts: 3,918

    Toymaker
    Member
    from Fresno,CA

    Isn't listening to multi Carbs in the throat with a tube and making them the same (to the ear) is method of sync'g them?
     
  30. raengines
    Joined: Nov 6, 2010
    Posts: 227

    raengines
    Member
    from pa.

    the computer has to know the volume of one cylinder and since you enter the engine displacment, it needs to know what to devide it by to get just one. it is a very accurate insturment, I use one on all my builds. accurate compresson ratio includes the area between the piston and cylinder wall down to the top ring and also behind the top ring, lots of calculations (nitpicking) also gets you just a little more hp.
    let the shitstorm begin now
     

Share This Page

Register now to get rid of these ads!

Archive

Copyright © 1995-2013 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Terms of Service. Privacy Policy.

Atomic Industry
Forum software by XenForo™ ©2010-2014 XenForo Ltd.