![]() ![]() I hope this helps you to understand how we do the leakdown if you have any questions though please ask. You constantly feed the 100lbs of air into the cylinder and bring the piston up to top dead center seeing how much air it holds before it breaks over center and dumps the air back out the exhaust port. ![]() Typically on a good set of sealing rings they will hold 90lbs or more of air but if the cylinder holds say 80lbs of air, which is a 20% leakdown, then you need rings. Professional-level functionality for reading and clearing OBD2 powertrain emission-related fault codes. Featuring several different sized adapters, including long reach, the 3614 provides functionality all different kinds of engine applications. We then rotate the piston clockwise until it comes up against the head of air and then we put a socket on a breaker bar on the clutch bolt and rotate the piston up slowly it will then start to raise the air pressure in the cylinder and keep your eye on the pressure as it starts to rise you will see it come up and then it will start to go down note the point at where it starts to go down. The Innova 3614 is designed with a stainless-steel hose for ultimate reliability and longevity. We set the pressure at 100lbs and then put the air in the top of the head through the spark plug hole. "We use a snap on EEPV309A00 leak down tester, it has the pressure regulator right on the guage. You also want to make sure the compression is equal in all cylinders. Anything below 110 could signal a potential issue, and an engine typically won’t run with much less than 100 psi compression. You don't want to take my word for it maybe you'll believe Bill's. What is considered low compression on a snowmobile The optimal compression is 120 psi (pounds per square inch) or greater. Since some appear to think this test is not possible here is a copy of the response from Bill Cudney to a similar topic on another site. I do use a compression tester but use it only to quickly verify that both cylinders are within 10%. It all depends on how hot or cold the engine is, how many pulls and how hard you pull etc. I performed the test (using 2 compression testers) using the same method kccats suggests and the readings were exactly 110 psi per cylinder. I have an 82 Indy 500 (triple) that I thought had low compression. Another reason I hate compression tests is that there is too many variables. Im curious what the compression should be on a smaller 2 stroke like a 340cc. Sled Mods & Tech-Tips zr 900 compression. in this thread in this sub-forum in the entire site. I have 3 different compression testers in my tool box and each one gives a different reading. 2003 zr 900, 2800 miles, runs great still, loads of power Did a compression test for the heck of it the other day. I wanted to add that if you are using a $10 compression tester don't expect much from it. ![]()
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