Compression Whistle Alert

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Rigid Flex
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No more burning your fingers and hands! Just Listen! Insert Whistle Alert™ into any 14mm spark plug hole and bump the engine until you hear the whistle. You are now on the compression stroke!
California Prop 65 Warning Symbol

WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.


  • Easily find Top Dead Center compression stoke
  • Turn engine over from inside the car and listen for the whistle.
  • Made of steel and aluminum
  • Made and assembled in the USA.



Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: What is the thread size? Does this fit aircraft engines?

It is for 14mm plug holes so it would work with Rotax and similar engines. It does not work with Continental/Lycoming engines.

Q: How long is the hose?

This unit has a rigid tube, and the overall length of the unit is 10-1/4".

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