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| Compression https://auszookers.com/forum/viewtopic.php?f=5&t=3135 |
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| Author: | Mike [ Sat Oct 11, 2008 5:09 am ] |
| Post subject: | Compression |
i wanted to test the compression on my zook to see if the rings are going or if its the valve stem seals what should the compression be on a 1.3 and what would be acceptable? Cheers |
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| Author: | Damo [ Sat Oct 11, 2008 12:52 pm ] |
| Post subject: | Re: Compression |
Mike wrote: i wanted to test the compression on my zook to see if the rings are going or if its the valve stem seals
what should the compression be on a 1.3 and what would be acceptable? Cheers As per the FSM, the standard compression should be 199 PSI. The service limit is 170 PSI. Maximum difference between any two cylinders should be 14.2 PSI. |
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| Author: | 11_evl [ Sat Oct 11, 2008 1:52 pm ] |
| Post subject: | Re: Compression |
and thats pretty std figures for almost any N/A petrol engine around. turbo can get away with a little lower pressures but still should be within the same range from cyl to cyl and diesel is another story altogether |
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| Author: | Mike [ Sun Oct 12, 2008 9:52 pm ] |
| Post subject: | Re: Compression |
so 185 to 190 across all 4 cylinders is pretty good? |
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| Author: | Damo [ Sun Oct 12, 2008 11:05 pm ] |
| Post subject: | Re: Compression |
Mike wrote: so 185 to 190 across all 4 cylinders is pretty good?
Yep, beautiful. Tell us how you did the compression test. And what's the problem you are having? |
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| Author: | Mike [ Sun Oct 12, 2008 11:12 pm ] |
| Post subject: | Re: Compression |
i disconnected the leads took out the plugs then screwed the compression tester into the first cylinder then turned over the motor a couple times if the compression is good that means the rings are alright right? |
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| Author: | Scrawny [ Sun Oct 12, 2008 11:21 pm ] |
| Post subject: | Re: Compression |
I hope you disabled the ignition system somehow too. Did you hold the throttle open too? Sounds like rings and valves are ok to me. It won't guarantee non-leaking valve stem seals or anything like that though. |
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| Author: | Mike [ Sun Oct 12, 2008 11:23 pm ] |
| Post subject: | Re: Compression |
what would happen if i didn't disconnect the ignition system? |
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| Author: | Scrawny [ Mon Oct 13, 2008 12:21 am ] |
| Post subject: | Re: Compression |
Puts massive strain on the coil. The spark still has to go somewhere and it takes a lot of effort to jump the spark to a ground |
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| Author: | Mike [ Mon Oct 13, 2008 12:24 am ] |
| Post subject: | Re: Compression |
would disconnecting the earth off the coil be enough? |
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| Author: | Rockhopper [ Mon Oct 13, 2008 12:47 am ] |
| Post subject: | Re: Compression |
Mike wrote: what would happen if i didn't disconnect the ignition system?
from a safety point of view, a stray spark could also ignite any unburnt fuel that may escape the cylinder through the spark plug hole. Not saying it will happen, but it could happen (I have seen it before). If there is a plug on the distributor wiring, you could disconnect that or either the positive or negative coil connection. |
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| Author: | JrZook [ Mon Oct 13, 2008 2:42 pm ] |
| Post subject: | Re: Compression |
Mike wrote: would disconnecting the earth off the coil be enough?
Yes |
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| Author: | rustylj [ Wed Oct 15, 2008 2:43 am ] |
| Post subject: | Re: Compression |
opening the throttle is bullshit.the engine will draw enough air pass the butteriflies,remember it's only winding on the stsrter motor. compression testing won't tell you if the oil rings or valve stem seals are worn.there the ones that cause oil usage. |
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