Whistle Alert (Flexible)


Whistle Alert (Flexible)

  • ipa_engine_calibration_kit_7891_03_1
  • Innovative Products of America #7894 In Use

Whistle Alert (Flexible)

(20 customer reviews)

Identifies compression stroke in hard-to-reach areas.

Find A Distributor
For International Customers
Distributor Information

To locate a distributor near you, please call 888-786-7899 or email us here.

International Sales

To place an order from outside of the United States, please call 888-786-7899 or email us here

Price $19.95

In Stock
Ships Within 2 Business Days


No More Burning Fingers and Hands! Just Listen for the Whistle to Find the TDC Compression Stroke.

The Whistle Alert (Flexible) performs the same job as the rigid version but can be placed in hard-to-reach places where the rigid version would be difficult or impossible to place. It screws into a spark plug hole to quickly indicate compression stroke.


Features and Benefits:

  • Eliminates the need for an extra hand
  • Can be used in hard-to-reach places
  • After installation, your hands are free to complete the job
  • Excellent for use on deep, recessed spark plug threads
  • Rigid model also available (#7882)

20 reviews for Whistle Alert (Flexible)


    works used to check when cylinder pistion at top dead center

  2. David

    Does its job perfectly Gets you a rough estimate of tdc. I used it in a few diesels using the glowplug hole. It saved a lot of time pulling a valve cover. It isnt perfect, you will then go to a dial indicator setup before timing the pump.

  3. Amazon Customer

    Must have tool I’m a professional aircraft mechanic and have inspector authorization. I need to put an engine I’m inspecting on TDC on the compression stroke for each cylinder to check compression. This tool saves me time which is money. I have two of them.

  4. Alan L. Young

    Great tool to have Works like its suppose too. No need to put thumb over hole to determine comp stroke.

  5. Jim home mechanic

    Good product This product works great, I wish I had it sooner.

  6. Cody

    Nice tool for the diy engine tuner Nice, makes finding top dead center quick and easy for one person

  7. Harry Jongen

    Need for any toolbox. Good product when you working alone on any vehicle.

  8. stephen tucker

    Great product Work perfect

  9. alanp

    super easy to use for finding compression stroke i bought this for finding the compression stroke on my small block. product works super easy. remove the spark plug and turn the engine over by hand or with the starter. helps when looking for TDC on the compression stroke- takes out the guess work.

  10. Robert Riedinger

    Five Stars Worked great for me. Very useful.

  11. Pontisteve

    Worked great on a 5.0L Ford! Seems good. I used this the other day for the first time, to find TDC compression. It worked just fine. I don’t care for the lazy feeling of just pushing a rubber tip into the spark plug hole, but I suppose it was convenient. And it did work. It just doesn’t feel all that positive going in, leaving you to wonder if it will work. I used it on a 302 EFI Ford Mustang though, and #1 is at a bit of an angle to get at it. And yet it worked just fine. I would buy it again.

  12. Tim Valencia Louden

    Five Stars works great love it!! little loud though ha

  13. jake1

    Five Stars works great

  14. The OG

    Works well Excellent tool

  15. Amazon Customer

    Five Stars Very simple but works like a champ.. Listen for the whistle and your at TDC..

  16. Christopher Adam Maloney

    Five Stars Works great.

  17. Amazon Customer

    Finding TDC on 2003 Indian Chief Powerplus 100 Motorcycle Best invention ever to find TDC. It was a snap to adjust the 4 push rods on my 2003 Indian Chief Vintage Motorcycle, with a Powerplus 100 cu. in. motor, After jacking the motorcycle up on a floor jack motorcycle lift, I put the transmission in 5th gear, then rotated the rear wheel until I heard the whistle on each of the 4 push rods (2 intake and 2 exhaust). That whistle told me that each valve was exactly Top Dead Center (TDC). It took more time (20 minutes required per valve spring) to bleed down each of the 4 valve springs before making the necessary wrench adjustments on the 4 push rods, than it did to find TDC. Before I bought this remarkable tool on Amazon, I could not adjust the the push rods like I can now. Great tool to have in your tool box.

  18. michael rice

    Great product Works better than I expected. Great, useful product. Thanks.

  19. Bruce Sumner

    Five Stars works real good

  20. Tim Bryant

    Highly recommend. Worked perfectly, Found TDC in 2 minutes. Highly recommend.

Add a review

Your email address will not be published. Required fields are marked *

Materials: Rubber, Steel
Package Weight: .16 lbs.
Package Dimensions: 12" L x 1.5" W x 1.5" H
Warranty: Lifetime Warranty

    Your Cart
    Your cart is emptyReturn to Shop
      Calculate Shipping