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SVTPerformance's Chain of Restaurants
Road Side Pub
Leak down test results suspicious....need input.
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<blockquote data-quote="tallfreak" data-source="post: 14714168" data-attributes="member: 70717"><p>I have a matco leakdown tester. It tells you the percentage of leak. It has one gauge for pressure and one for percentage. I think the percentage gauge is just the pressure in the cylinder. </p><p></p><p>You have to pull the heads to remove the valves. Since you have the valve covers off, verify the engine is still in time. Go get a real leakdown tester and bore scope. It sounds like your test is similar to a real tester but you don't know what your results mean. If you can't read the results the test is invalid. </p><p></p><p>Cylinders are not like a balloon at all. The rings will leak a little no matter how new or old or clean the engine is. The valves should have no leaks. A general rule of thumb is 20% leakage or less. Preferably 10% or less. When I am testing an engine I know hasn't been run in a while I will accept a little higher number than an engine that drove into the shop. The cylinders on a engine that hasn't been running will have no oil. </p><p></p><p>Spray some brake clean on the back of the intake valves when they are closed then again open. Blow the ports out with air. Try to get all the trash out you can. </p><p></p><p>Do you know how many miles are on it?</p></blockquote><p></p>
[QUOTE="tallfreak, post: 14714168, member: 70717"] I have a matco leakdown tester. It tells you the percentage of leak. It has one gauge for pressure and one for percentage. I think the percentage gauge is just the pressure in the cylinder. You have to pull the heads to remove the valves. Since you have the valve covers off, verify the engine is still in time. Go get a real leakdown tester and bore scope. It sounds like your test is similar to a real tester but you don't know what your results mean. If you can't read the results the test is invalid. Cylinders are not like a balloon at all. The rings will leak a little no matter how new or old or clean the engine is. The valves should have no leaks. A general rule of thumb is 20% leakage or less. Preferably 10% or less. When I am testing an engine I know hasn't been run in a while I will accept a little higher number than an engine that drove into the shop. The cylinders on a engine that hasn't been running will have no oil. Spray some brake clean on the back of the intake valves when they are closed then again open. Blow the ports out with air. Try to get all the trash out you can. Do you know how many miles are on it? [/QUOTE]
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SVTPerformance's Chain of Restaurants
Road Side Pub
Leak down test results suspicious....need input.
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