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Saturn 2001 SL1 has 1 cylinder 100 compression and other cylinders have 125 Is this bad?
Wiki User
∙ 17y ago
There should only be a 10% difference between all the cylinders so using the math, the lowest a cylinder should be 112-113. Your lowest cylinder is 20% off, not 10%. I don't think it's to bsd yet, keep an eye on it, if it gets worse it could have a bad valve or ablone head gasket.
Wiki User
∙ 17y ago
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Why do twin scroll turbos need 2 wastegates?
They don't. You will lose a little bit of HP because the wastegated cylinders will run a bit more rich at full boost, however, this may be good, and act to gradually round off the hp as it approaches the wastegate full-open/full-boost position. When the wastegate opens on a single wastegate/twin scroll installation, half of the cylinders will see a decrease in exhaust pressure. Temp=pressure*volume/boltzmann constant*# of moles. The ONLY thing that changes when the wastegate opens is the EXHAUST pressure on half the cylinders. A reduction in exhaust pressure equals a corresponding DECREASE in EGT in the wastegated cylinders. As long as the single wastegate can vent off enough exhaust to ensure there is no overboost condition occuring, it works just fine. The cylinders are a constant displacement device, which means that the compression in the cylinder and the amount of exhaust exiting any one of the cylinders WILL BE THE SAME no matter WHAT happens on the exhaust side. The ONLY thing that changes is exhaust PRESSURE and, subsequently, EGT. If you are running high-overlap cams, there will be a slight increase in the amount of blow-through seen by the engine during the overlap condition. In that case, the wastegated cylinders will ingest more air/fuel charge due to overlap. The air/fuel in the wastegated cylinders actually DECREASES and it runs MORE rich. Why? Because air moves faster than fuel, and moves out of the cylinder easier and faster. Once the exhaust valve closes, the trapped air/fuel charge is enriched slightly, usually by about -0.5 AF. Any differences seen an be tuned around, so no big issue, esp. if you have per cylinder trim on your ECU. The reason to run two wastegates is to ensure that the cylinder AF balance is "perfect" all the time, and, that there is enough vented exhaust to ensure no overboost condition. No other reason to do it.
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It all depends on your riding.racers change 25hrs or so.I ride every other week end 3-4 hrs,its giong on 3yrs since last top end.Buy compression tester 170psi needs top end,my compression 220.KTMs piston are forged like wisco,But austria quality.Usually bike has lost power,runs but not as peppy ,depending on compression. tbiker67@yahoo.com
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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.
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It varies from one engine to the next but, what you want to see is that all the cylinders compression readings are within 10% of each other.
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Is the head bad if there is no compression or is it the oil pump that operates the lifters on a 1988 323?
No compression on all cylinders would indicate a broken cam belt. i think this motor has hydralic lifter, but for them to cause no compression it would be unlikly. when you say no do you mean none at all or low compression? a broken cam belt could be the cause if all cylinders have no compression. if the cylinders are down it could be bad valve seats (the point of contact between the valve and the head). if it is one or two cylinders it could be cracked head or cracked/broken head gasket. the only other possablilities are broken rings or broken piston. you need to know compression reading of all cylinders in a dry and wet situation. to do this 1:take the compesssion of a cylinder 2:then remove compression guage and squirt two good squirts of engine oil in the cylinder through the plug hole. 3:retake comperssion reading of cylinder. if the compression reading increases you have bad rings, if it doesnt the rings are fine. hope that helped and not confused you Geoff
What should the cylinder compression be on a 1997 Nissan sentra series 3 with a 1.6 liter engine?
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What should be the compression in each cylinder be for 2003 Chevy s10 4.3 l?
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Why is my 2007 Nissan Verse giving me a reading of a misfire in cylinder 1 when i changed all my coils fuel injectors and spark plugs?
Do a compression test on all cylinders and compare findings. All cylinders should be within 10% of each other.
How do you run a compression test for 2001 Saturn SL?
Running a compression test is pretty much the same for all internal combustion engines.Remove all sparkplugs, marking where the wires went; you don't want to connect the wrong wires to the plugs when you're finished.Start with cylinder 1, screw in a compression gauge where the sparkplug just came out. Some compression gauges just press in, but I prefer the screw in type.Have an assistant engage the starter as though trying to start the engine. Obviously the engine won't start without plugs.You should hear and/or feel the engine compression on the single cylinder with the gauge in place; make sure that cylinder goes through compression cycle at least 3 times.Read the value on the gauge. The gauge should hold the compression reading, allowing you to record the reading.Write down the compression reading and the cylinder number.CLEAR THE COMPRESSION GAUGE. You can release the compression reading, usually by pressing a button or turning a knob. It's different for different style gauges.Repeat the process for all cylinders.Compare the compression value for all cylinders; they should be within a few percent of each other. Any small variance can be attributed to cylinder or valve wear. Large differences indicate severe problems. If any two adjacent cylinders have zero compression, you probably have a blown head gasket.
What can be done if Saturn sl1 has burnt valve what are symptoms?
The definitive way to determine if there is a burned valve or blown head gasket is to run a compression test. Mark the spark plug wires; either a piece of tape with the cylinder number or you can buy wire marker labels... your choice. Remove the spark plugs. Using a compression gauge, start at cylinder 1. Some gauges press into the sparkplug hole, some thread in, either way, make certain that the gauge is being used properly, then have an assistant engage the starter as though you are trying to start the engine. Make certain that the piston in question comes to the top of the compression cycle at least 3 times. Write down the pressure that the gauge reports, then proceed to the next cylinder. Perform the test for all 4 cylinders. If any of the cylinders is incapable of producing pressure that is about the same as the other 3, you PROBABLY have a burned valve. If the pressure in 2 adjacent cylinders is low, you probably have a blown head gasket. Either way, if any cylinder has low compression on the compression test, you will not be able to repair the engine without removing the head. If the compression on all 4 cylinders is reasonably good (close to 90 PSI or more) you probably don't have a burned valve. Good luck.
How do you test cylinders?
Conducting a Cylinder Compression Test. Before conducting a compression test, disable the ignition and the fuel injection system if the engine is so equipped. Connect a remote starter button to the starter system. Connect a battery charger to the car to allow the engine to crank at consistent and normal speeds needed for accurate test result. Depress the remote starter button and observe the gauge's reading after the first engine revolution. Allow the engine to turn through four revolutions and observe the reading after the fourth. After testing all the cylinders. If one or more cylinders is much lower than the other, continue nder with testing those cylinder with the test. Squirt a small amount of oilring sealing into weak cylinder. Reinstall the compression gauge into that cylinder and conduct the test. If the reading increases with the presence of oil in the cylinder,.
