Post by willy3pigs on May 2, 2021 16:57:28 GMT
I've just used my recently purchased "Mickey Mouse" ebay compression tester. For the grand sum of £10.99, I wasn't expecting much in the way of accuracy, it was more for a comparison from cylinder to cylinder on an engine that had not run for 22 years. I blew compressed air through the aluminium tube fitting with the squishy rubber cap seal on the end with a known 90 psi air supply to get some idea of how well it was calibrated, it showed 75 psi.
Tested the cylinders with the screw in rubber hose fitting, and noted the results, then out of curiosity retested using the push to seal aluminium tube fitting and got results exactly 25 psi per cylinder higher. From what I've now seen on youtube reviews this is due to the one way valve being fitted on the gauge, instead of on the plug end of the numerous connection fittings supplied in the kit.
Fellow suckers/purchasers on youtube claimed to have stripped engines on the strength of the results from these testers, according to the comments below some of the vid's.
I would recommend anyone counting on accurate results to go for a test gauge with the valve on the spark plug end of the connection fitting, such as the positively reviewed Machine Mart offering, twice the price but still good value.
Tested the cylinders with the screw in rubber hose fitting, and noted the results, then out of curiosity retested using the push to seal aluminium tube fitting and got results exactly 25 psi per cylinder higher. From what I've now seen on youtube reviews this is due to the one way valve being fitted on the gauge, instead of on the plug end of the numerous connection fittings supplied in the kit.
Fellow suckers/purchasers on youtube claimed to have stripped engines on the strength of the results from these testers, according to the comments below some of the vid's.
I would recommend anyone counting on accurate results to go for a test gauge with the valve on the spark plug end of the connection fitting, such as the positively reviewed Machine Mart offering, twice the price but still good value.
