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Author Topic: Which compression tester should I get?  (Read 1677 times)
stopintime
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S2R 800 '07
« on: September 24, 2023, 02:41:43 AM »
My engine guy asked me to do a compression test to help our diagnostic work.

Fuel prices makes it cheaper to buy a kit and do it myself, rather than travel two hours t/r to my dealer (after just one use).

The cheapest kit has 14 and 18 mm thread mounting pieces, but also a coned rubber thingy. https://www.biltema.no/en-no/car---mc/workshop-equipment/test-instruments/compression-testers/compression-tester-2000016979

The other has more stuff  https://www.biltema.no/en-no/car---mc/workshop-equipment/test-instruments/compression-testers/compression-tester-petrol-2000022140
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ducpainter
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DILLIGAF
« Reply #1 on: September 24, 2023, 03:22:13 AM »
If the cheaper one has the threaded adapters, it will be fine. It doesn't show any in the photos.  Huh?

The rubber cones work, but can be a PITA.
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stopintime
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« Reply #2 on: September 24, 2023, 03:39:42 AM »
Quote from: ducpainter on September 24, 2023, 03:22:13 AM
If the cheaper one has the threaded adapters, it will be fine. It doesn't show any in the photos.  Huh?

The rubber cones work, but can be a PITA.

The cheaper one has a 14mm adapter. Our plugs are 12, I believe. Rubber PITA because?
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ducpainter
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DILLIGAF
« Reply #3 on: September 24, 2023, 03:45:01 AM »
Quote from: stopintime on September 24, 2023, 03:39:42 AM
The cheaper one has a 14mm adapter. Our plugs are 12, I believe. Rubber PITA because?
Sometimes it's a pain to hold it in place and operate the starter switch.
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stopintime
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« Reply #4 on: September 24, 2023, 11:40:00 PM »
For a more specific piston to cylinder test, they recommend pouring a teaspoon of oil in the spark plug hole. That should spread out nicely in the vertical combustion chamber, but what about the horizontal? Spray another liquid in the hole? WD40? Silicone spray? Chain lube?
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Howie
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« Reply #5 on: September 25, 2023, 04:17:44 AM »
Quote from: stopintime on September 24, 2023, 11:40:00 PM
For a more specific piston to cylinder test, they recommend pouring a teaspoon of oil in the spark plug hole. That should spread out nicely in the vertical combustion chamber, but what about the horizontal? Spray another liquid in the hole? WD40? Silicone spray? Chain lube?

Good question.  My best guess would be fogging oil.
https://www.bing.com/shop/productpage?q=engine+fogging+oil&filters=scenario%3a%2217%22+gType%3a%2212%22+gId%3a%22156673970157%22+gIdHash%3a%220%22+gGlobalOfferIds%3a%22156673970157%22+AucContextGuid%3a%220%22+GroupEntityId%3a%22156673970157%22+NonSponsoredOffer%3a%22True%22&productpage=true&FORM=SHPPDP&browse=true 

A more conclusive test would be a cylinder leak down test.



The tool is awfully expensive for a one time use, but any competent local shop should be able to perform this test.
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stopintime
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« Reply #6 on: September 25, 2023, 12:33:30 PM »
Adapter is fitted finger tight?
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ducpainter
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DILLIGAF
« Reply #7 on: September 25, 2023, 12:50:59 PM »
Quote from: stopintime on September 25, 2023, 12:33:30 PM
Adapter is fitted finger tight?
Yes. The o-ring should seal it.
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"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
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    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent.”
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