STOP Using the WRONG Compression Tester! ( There Are 2 Types )

Comments · 708

• ST

  @StevesSmallEngineSaloon · 1 year ago · pinned

  ✅ SMALL ENGINE COMPRESSION TESTER ➜ <a href="https://amzn.to/4gQb6Cw">https://amzn.to/4gQb6Cw</a><br>✅ AUTOMOTIVE COMPRESSION TESTER ➜ <a href="https://amzn.to/4hcOYCL">https://amzn.to/4hcOYCL</a><br>👉 Drop Starting VIDEO ➜ <a href="https://www.youtube.com/watch?v=PsF2SEWEa18">https://youtu.be/PsF2SEWEa18</a>

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• CH

  @chadrogers4635 · 1 year ago

  I believe the one with a schrader valve holds the compression in the hose so it doesn&apos;t have to rebuild that pressure back up, whereas the one without loses the compression out the exhaust each time the piston opens up the exhaust port.

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• KE

  @kevinjohansen8149 · 1 year ago

  And if you replace the Schrader don&apos;t use a tire valve because it has a heavy spring. It will read low. A tire chuck has a pin in the middle that opens the Schrader. The one specifically for the compression testers have a very light spring

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• MI

  @mikebuckley5740 · 1 year ago

  Never seen a tester with out a shredder valve

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• KR

  @kr4dh4x0r · 1 year ago

  The main reason I think this matters is because it&apos;s a 2 stroke small engine vs a 4 stroke w/ valves that seal the chamber. &nbsp;The 2 stroke is letting compression go back out the intake/exhaust ports on each cycle.

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• LE

  @Leonardokite · 1 year ago

  Well you had me worried there. I immediately ran out to the garage to check my tester. Fortunately it had the Schrader valve. I had tested a chainsaw at 45 PSI and after seeing what you did I wanted to make sure I hadn&apos;t condemned it improperly. Another fine lesson from Steve&apos;s Small Engine Saloon!

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• IN

  @integr8er66 · 1 year ago

  It&apos;s very simple, the hose effectively lowers the compression ratio, its like having more cc&apos;s in the head spacing, or dishing the piston. By having the valve right at the start of the hose the pressure in the hose itself won&apos;t bleed back, so you can eventually fill up the hose to the actual compression of the cylinder.

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• BO

  @bobbylibertini · 1 year ago

  I had no idea..... This will come in handy one day and save me a lot of trouble (and time...and money). Thank you, Steve- This is simply the BEST small engine channel out there!

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• 86

  @86daytonaz · 1 year ago

  Well, &nbsp;thank god I watched this video cause I just purchased the wrong one. Back to the store I go!.

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• WI

  @Willy7212 · 1 year ago

  For your viewers, I bought the Mityvac compression tester exactly like yours and it is awesome. <br>Good to mention too that it comes with 5 spare shrader valve replacements and replacement O rings.<br>Can not remember what I paid for it in Canadian dollars, but it was worth every penny.<br>Cheers Steve

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• MA

  @maxwebster7572 · 1 year ago

  Removing the Schrader was done for 2 reasons. 1, to use &nbsp;for a running compression test and 2, for checking head gasket leak down with shop air. Running compression used to be an advanced diagnostic that we did after finding issues with vacuum gauges under load and at running temp. These tests can now be done with a Pico scope electrically. Most cheaper gauges were not accurate enough for these tests to show the fluctuations at running rpm.

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• BO

  @bobbyschroeder7068 · 1 year ago

  I literally just had this problem couldn&apos;t figure out why the cheaper gauge wouldn&apos;t work. Now it make sense. Thank you. I bought an OTC set that one works great

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