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Old 08-04-2016, 11:26 AM   #1
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Compression Test

Started doing a compression test on my 03. So far passenger side has been 180 with the exception of #6 cylnder which was 172/175. What are the normal withn range numbers suposed to be? This was a dry test.

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Old 08-04-2016, 11:31 AM   #2
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I've always considered all cylinders within 10 psi of one another above 140. What lead you to do a compression check? #6 is often the cylinder that has spring problems. Have you upgraded the springs yet?
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Old 08-04-2016, 03:20 PM   #3
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I've always considered all cylinders within 10 psi of one another above 140. What lead you to do a compression check? #6 is often the cylinder that has spring problems. Have you upgraded the springs yet?
no problems, just bought the truck used about a month ago and was just going over it checking stuff out. As far as I know it has the stock springs.
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Old 08-04-2016, 03:53 PM   #4
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There are a few 03/04 that had valve springs that broke. Often it seemed #6 was the cylinder. There was no rhyme or reason, some were low mileage, some high mileage, some while sitting at a light some at high rpm. Sometimes there was only a miss, other times there was a bent valve and broken piston with scored cylinder wall. I think it's something that 03 owners should be aware of but not lose sleep over. When an opportunity presents itself then replace the springs with oem 6.1 springs or your favorite aftermarket spring. Often this during a cam change or a valve job. If you develop a miss or throw a misfire code, immediately check the springs, it can get ugly. The other thing is that the 03 pcm is the first year for the hemi and has limited tuning. There are some work arounds which I have tried as others and have spent considerable time and resources trying to make it more tunable. Simple truth is the pcm cannot support big cams or being boosted. The good news is it isn't a big deal to swap the pcm with an 05 pcm. It is intimidating when you look at the wiring but you just do it wire by wire. Good luck..
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Current 60' PB 1.351 (2019) mechanical issue for 1/4m

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Old 08-05-2016, 05:16 PM   #5
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Quote:
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replace the springs with oem 6.1 springs

6.1 exhaust valve springs all around. They fit the 5.7 heads better.
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