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Both are used to describe sequences.
The answer is Compression Ratio. You should try reading the Study Unit it really helps!
yes ones on the right
Describe is what it is and explain is why it is as it is
Technically, a cylinder is a prism, as it has a fixed shape at the end.
It is there to stop the fluids and compression from leaking out.
Compression ratio is the difference in the volume of a engine cylinder between when the cylinder is at it's largest volume, compared against when the cylinder is at it's smallest volume. Gasoline engines use 8:1 to 12:1 compression ratio. Diesel fuel engines use 14:1 to 25:1.
I have a 2005 and compression should be close to 120 psi. Normally a good engine will have compression between 115 and 130 psi but a leak down test should be performed also to know the full condition of a cylinder.
Bore is the diameter of the piston/cylinder, stroke is the distance the piston can travel between its highest position and its lowest position in the cylinder.
150 psi per cylinder with +/- 20 psi difference between cylinders
A compression test can tell you many things such as if you're getting blow by. which means one of two things either all the compression ring gaps on the piston line up in sync or possibly you have a crack in your cylinder. Also if you have the distributor shaft apart from the engine a compression test will help indicate when the proper piston is at TDC (top dead center). If you get low compression on one cylinder, put a teaspoon of engine oil down the bore. If the compression improves, then you have a worn bore or rings. If there is no difference, you have a burnt valve. If two adjacent cylinders are low, it is very likely that you have a blown cylinder head gasket between those cylinders. This could also include a warped cylinder head and may need skimming.
NO, an unplugged wire is electrical, and the turning of the ingnition lock cylinder is purely mechanical. Therefore there is no cause/effect relationship between the two. What you describe is pure coincidence, and not a cause for the sticking lock cylinder.
The spark plug gap is .054 inch Another fellow did a compression test on his 1991 or ? and his lowest cylinder was 145 PSI and his highest cylinder was 150 PSI It is the difference between the lowest and highest cylinders, so his engine was in good shape.
There are no gasketsused between the cylinder head and the cylinder, but there can be shims used to control compression ratio. The shims are used when the head has been flycut (machined) when it is being rebuilt. You can have the heads flycut to raise compression ratio if desired. Be careful with the air cooled engines because too high a compression ratio can be disasterous! A competent VW machine shop can give you more details
I'm not sure of the exact values; they should be in your Haynes repair manual. However, if you compression test all of the cylinders and find one that is lower you have a compression problem with that cylinder. It is also possible to have 2 that are lower, this would most likely indicate a warp in the head between those two cylinders. Other causes for compression loss are damaged or gunked up valves that do not close all the way or a crack in the head.
The 1992 model, 25 hp Evinrude outboard will usually run between 120-140 psi. The main thing here is that there is no more than 10 psi difference between cylinder readings.
should be at least 100 PSI and the difference between cylinders should be less than 10% of each