Compression Test

[kevinhughes13]

Hello I am looking to do a compression test on my f22A1 sometime this week before I take it into the mechanics shop to get the exhaust fixed what I need to know is what fuses do I pull to stop fuel/spark? Do I do the compression test when the engine is warm or cold? How many times do I crank the engine to get a proper reading? Because I see some do 6 some do 9-12 not accurate on some of these videos. As far as I know already the results should be around 178 with a maximum variation number of 28 I am doing this test because of the blue smoke I get around 6k RPM'S I know I probably shouldn't even take a engine with this many miles and do that but yeah lol. I just want to confirm that my engine is in at-least good shape to last me 2-5 more years probably going to do a leak-down test too within the next couple weeks so please any tips or suggestions on how to do it please post. Thank you in advanced. BTW like I said the main reason why I am doing this is to find out if it is a healthy motor and to see if I should be putting more money into it then it is necessarily needed just in case the motor is no good although I could put another F22 motor in if it is bad.

[sonikaccord]

Main relay fuse would do it.

I normally do it cold, you are looking for consistent numbers across all cylinders more than a specific number.

You want the piston to compress so it really depends on what part of the cycle it's on.

Well, if you want it to last you'll have to not rag on it. Revving to redline on an old motor will show it's age. Just keep up with basic maintenance and watch the oil and you should be fine.

Edit: I push my motor to redline several times and I am pushing 260k

[Granite CB7]

This link sums it up. Engine warm. All plugs yanked. Fuel and spark disabled. Wide open throttle. Same number of strokes to be consistent.
http://www.gregsengine.com/cylinder-...n-testing.html

[illinois_erik]

This link sums it up. Engine warm. All plugs yanked. Fuel and spark disabled. Wide open throttle. Same number of strokes to be consistent.
http://www.gregsengine.com/cylinder-...n-testing.html

its not good to remove the spark plugs from a warm engine. chance of stripping things.

Id do it cold, and first a dry test, write down your numbers, then a wet test throwing a spoon full of oil down the plug holes and write down those numbers. Youll get a better idea of whats going on that way. stock numbers are about, i believe 180-190 PSI. as long as they dont differ more than about 10% from each other is within specs.