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> Compression on the SIX, what do you think?
Trekkor
post Jan 20 2005, 08:34 PM
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1. 162
2. 155
3. 148
4. 145
5. 140
6. 162

Not too alarming, is it?

KT
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Dr Evil
post Jan 20 2005, 08:35 PM
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Is it broken in yet? Have the rings fully seated? Does that matter?
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Joe Bob
post Jan 20 2005, 08:41 PM
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It ain't great....did you do it with all the plugs out, hot engine and WOT?

Have you done a leak down?

Have you tried a little oil in the low holes and recheck?
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Trekkor
post Jan 20 2005, 08:45 PM
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Did it bone ( freezing ) cold, WOT and only plug out for each hole being tested.

KT
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jim912928
post Jan 20 2005, 08:50 PM
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what mike said...engine should be warm and all the plugs out. If you find any cylinders low squirt some oil down there and recheck. If the pressure comes up to be more inline with the others then it points to rings. If it doesn't matter it could be valves. Leak down will be your next test.
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Trekkor
post Jan 20 2005, 08:56 PM
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Why do the other plugs need to be out?

KT
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scotty914
post Jan 20 2005, 09:00 PM
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you dont want the starter fighting the compression stroke on the other cylinders, or drawing a vacumn on the intake
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McMark
post Jan 20 2005, 09:09 PM
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(IMG:http://www.914world.com/bbs2/html/emoticons/agree.gif) The engine spins easier and faster with all the plugs out.
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Joe Bob
post Jan 20 2005, 09:13 PM
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AND it simulates real time running....at high rpms....you're trying do a check at highest operating level....
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Joe Bob
post Jan 20 2005, 09:15 PM
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QUOTE (trekkor @ Jan 20 2005, 06:56 PM)
Why do the other plugs need to be out?

KT

JUST DO IT AND STOP ARGUING.....


Works with my kids..... (IMG:http://www.914world.com/bbs2/html/emoticons/biggrin.gif)
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boxstr
post Jan 20 2005, 09:18 PM
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KT I have a freshly rebuilt 2.0 four I'll trade you for the weak six. (IMG:http://www.914world.com/bbs2/html/emoticons/laugh.gif)
CCLINSORRYCAN"THELPMYSELF
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Trekkor
post Jan 20 2005, 09:19 PM
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So, a warmed up motor and plugs out will give me improved numbers?

KT
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scotty914
post Jan 20 2005, 09:20 PM
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one word..... yup
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jim912928
post Jan 20 2005, 09:21 PM
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might not be improved but they will be more accurate. Oil will be all around the cylinder walls and tolerances will be better with things being alittle warmer.
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Trekkor
post Jan 20 2005, 09:28 PM
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Where should the numbers be?

KT
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iiibdsiil
post Jan 20 2005, 09:37 PM
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Consistency is the key thing. I think the allowed tolerance is 12 psi, but I could be wrong. Looks like you should be about 160.
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Joe Bob
post Jan 20 2005, 09:42 PM
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170 and above is great.....
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Trekkor
post Jan 20 2005, 09:50 PM
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A local mechanic said no more than a 25% differance between best and worst.

I'm at 14% (IMG:http://www.914world.com/bbs2/html/emoticons/confused24.gif)

KT
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jim912928
post Jan 20 2005, 09:58 PM
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post your new numbers...they should get closer. But even if they do not improve I don't think they are drastic enough or low enough to warrant tearing anything apart. Just drive and have fun!
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Gint
post Jan 20 2005, 10:01 PM
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I've run worse. 14% isn't great, but it'll run OK. Don't worry about it.
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