For this reason, it's next to impossible to find suggested compression test results for most engines. You may not know the answer just from using a compression tester, but you will know one answer: Whether or not you need to open up the engine for a closer look. This kit is rated to handle a maximum of 300 PSI, and is suitable for all gas motors in automobiles, motorcycles, and even marine equipment. Each option in our selection has been given careful consideration, since faulty compression results could end up costing significantly more than any of these tools. Insert the leak-down tester hose into the spark plug hole, then connect it to a compressed air source of at least 100 psi.

It seems to me, exactly as Mr Ninja says above

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If you take the valve cover off you can "POP" the valves slightly with a wooden dowel and a small hammer. This is a common question, particularly from racers who are considering rebuilding their own engines for the first time (and usually followed up with a comment about the higher cost of a leak-down tester).Further complicating things, nonstandard restriction orifice sizes will cause different indicated leakage percentages with the same cylinder leakage. Each tester comes in a durable case except for the Innova 3612, chosen for its versatility of application and caliber. Learn how to trip your single stage compressor into running before it reaches its normal "on" pressure. Leakage is given in wholly arbitrary percentages but these “percentages” do not relate to any actual quantity or real dimension.

There is no standard regarding the size of the restriction orifice for non-aviation use and that is what leads to differences in readings between leak-down testers generally available from different manufacturers. A leak down tester sized for automotive engines (usually 600-700 cc cylinders) will NOT work properly for a much larger or much smaller cylinder sizes. This tester is a great tool for any mechanic that is serious about performance finding leaks is simple and effective especially in snowmobiles we have found that the exhaust is always suspect to leaks and should always be addressed.

Re zero the gauge between each test, do multiple tests on each cylinder, get the feel of how this stuff is working. Testing is done on an engine which is not running, and normally with the tested cylinder at top dead center on compression, although testing can be done at other points in the compression and power stroke. You can watch the leakage "rate" increase as the feed pressure drops below 110 psi on the gauge on your compressor.

The threads for each 14mm hose coupler are well machined and will accommodate additional adapters while still holding pressure. Designed to detect a variety of common engine faults such as worn piston rings, cylinder head cracks, worn valves and blown head gaskets. Most instruments use 100 psi (690 kPa) as the input pressure simply because ordinary 100psi gauges can be used which corresponds to 100% but there is no necessity for that pressure beyond that.Your pulse can show an indication of a problem (if you have no pulse, you probably need a rebuild), but "normal" can vary depending on the individual and the circumstances. Now you read the second gauge on the leak-down tester, which indicates the amount of pressure actually in the cylinder. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship.