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  #21  
Old 04-25-2008, 09:58 AM
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Old 04-25-2008, 12:09 PM
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  #23  
Old 04-25-2008, 12:41 PM
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I now have 3,300 miles on my rebuilt motor(22RE) in my 88 Pickup. It took till about 3,000 miles for the rings to seat themselves. However, I plan to wait till 5K to change over to Mobil 1 Syn. My two cents.....
Also, I fill mine to the full 5 qts. with a filter to bring the oil to the top line on the dipstick. I know that the books says 4.5, but that puts it about halfway between the lines on the dipstick.
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  #24  
Old 04-25-2008, 01:21 PM
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How did you determine your rings seated? Compression check? If so, what are you getting for a ratio?

I just did an oil change (regular GTX) this past weekend. Using the common Toyota filter (90915-YZZ-something, made in Thailand) it took a splash more than 4.5 quarts to hit the top of the hatching on the dip stick. That's the way it's always been for me. In the course of about 3500 miles I was down about 1/4 of the hatching, so maybe 1/8 to 1/4 of a quart.
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Old 04-25-2008, 01:25 PM
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You can try 'dry' and 'wet' compression checks and compare, I would think. The well seasoned 22REs I've done recently (93 truck, 88 truck) came in at >160psi (more like 170psi) dry and at operating temps. Do full throttle.
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  #26  
Old 04-25-2008, 02:20 PM
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You can try 'dry' and 'wet' compression checks and compare, I would think. The well seasoned 22REs I've done recently (93 truck, 88 truck) came in at >160psi (more like 170psi) dry and at operating temps. Do full throttle.
OK, I've never measured higher than 160 psi on 22R and 22R-E engines here in Denver (sample size of 4, 3 of which were admittedly at least 150K or older). A stock 22R-E should have a 9.3:1 ratio, which at sea level (14.7 psi) should result in 186 psi when compressed. This agrees with the FSM, which says 181 psi is the max pressure. My old engine was around 140 psi at last check, which was at least a year before the timing chain incident. That 1984 Dean and I bought-n-sold, Dean's 20R and now my new 22R-E are all have been in the 135 to 155 psi range.

When you correct for the typical ambient air pressure here at 5,280' AMSL (12.2 psi), that gives a compressed pressure of 155 psi with a 9.3:1 ratio. That's in the range of value I was getting when I stopped obsessing about it. My compression ratio is a bit lower than stock because of the enlarged combustion chambers and stock deck height and so I figured I should expect more like 151 psi with a ratio of 9.1:1 to 9.2:1. I have not done the calculations to find my exact ratio because I forgot to measure the piston-to-deck height before I put the head on. So I dunno my exact combustion chamber volume. But in any case, I figured with minimal carbon build-up I should expect 150 to 155 psi with regular weather. I do them at full operating temp (minus the time it takes for me to burn my arms pulling the plugs), WOT and plenty of cranks. The needle stops moving + 3 or 4 more cranks.

All of this also agrees with the rule of thumb about altitude compensation.

http://www.pelicanparts.com/techarti..._rebuild-2.htm

Altitude Factor
500 0.987
1500 0.960
2500 0.933
3500 0.907
4500 0.880
5500 0.853
6500 0.826
7500 0.800
8500 0.773

181 psi * 0.853 = 154.4 psi

I was doing a wet test and there was some question as to how much oil to squirt in there (I'd heard to shoot for 2 tablespoons and that's hard to estimate with a leaky turkey baster). I was getting such wildly varying pressure, from just a slightly bump to 160 psi all the way up to 190 psi, that I just figured that I was too inconsistent with the oil in the chamber to be useful. With what I would call a heavy mist of oil my pressure only jumped around 5 psi and that I think is most useful in convincing me my rings are seated. My dry tests are even across all 4 cylinders, well within the 5% from highest to lowest (~5 psi).

Also, my compression checker is not a particular good one. It was $20 or something at Sears. There could be some accuracy inconsistencies between tools and so I'm happy if I'm within about 5% of my expected value of 151 psi, which would be 144 psi to 159 psi. So, yeah, I've thought about it a little...
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Last edited by DaveInDenver; 04-25-2008 at 02:46 PM.
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  #27  
Old 04-25-2008, 03:06 PM
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Wow! That's alot of information there Dave, but good info.... After about 1500 miles on my new engine it started going through oil, total about 3.5 quarts in a span of about another 1,300 miles(so lets say 2,800miles on the engine) which made me nervous, but after speaking with my mechanic and reading more about rings seating I calmed down, and sure enough the engine quit going through oil. Now, let me clarify where the oil was going I have no idea. No leaks, no blumes of smoke, kind of mystery because nothing was visible to the naked eye. After many checks of the oil level for the past 500 miles it has held steady and has needed no more oil added, so I assume that the rings finally did get seated.
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  #28  
Old 04-27-2008, 08:54 AM
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Not sure if you've got your supplies yet Dave, but I saw in this morning's paper that Checker is running a sale/rebate on Valvoline Synpower for .99 / qt. That's pretty tough to beat for fully synthetic!
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  #29  
Old 04-27-2008, 09:37 AM
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Wow, a buck a quart. That's even way cheaper than regular dino oil.
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Old 04-27-2008, 07:56 PM
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No kidding. I usually wait for deals like that, and then stock up. I've found Penn Platnium and Valvoline both run deals like that if you pay attention. For Mobil1, I just by the $22 jug from Walmart.
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