Date: Mon, 4 Jun 2007 08:11:32 -0400
Reply-To: benoit <huotb@VIDEOTRON.CA>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: benoit <huotb@VIDEOTRON.CA>
Subject: Re: What's Wrong With my Compression?
In-Reply-To: <852471.89257.qm@web82706.mail.mud.yahoo.com>
Content-Type: text/plain; charset=us-ascii; format=flowed
HI, i have never seen a wasser engine with totaly even compression,
never. The best was +-10psi
The highest was 175psi, the average is 140-160, very strong runner older
engine run's in the 125.
Most vans have one weaker cylinder (lower compression), most engine
re-seal/top end i do are in the 150 all around but with new heads, those
will reach the 160 with time....
Drive your van and have fun....
Regards, Ben
David Kao wrote:
>Hi Benny, I did not pay attention who said it. Any way, I think it makes sense
>that the gaps were factory trimmed to proper gaps already. To me the risk of
>breaking one or more rings is too high. Handling rings is not trivial. Now that
>3 of my cylinders get excellent compression it is unlikely the cause of the
>#3 problem now.
>
>I did another round of compression check again today with the engine hot. The #3
>became 115 PSI. After I squirted some oil into the spark plug hole it shot up
>to 140 but after one more round of checking it was really about 125. This
>seems indicate that the rings are not completely seated yet. It may still be
>a valve sealing problem though. I will try to find a place to do a leak down
>test for me.
>
>I added some miles to it today and now it has reached 300 miles. I can feel that
>the engine is gaining horses every few days. It's really not bad at the current
>state. I bet most people who test drive it will not suspect anything. I have
>oil level in between the max and min marks but I have 10w-40 in the engine.
>
>Hope this engine will be ready for my next Yosemite camping trip in about 3 weeks.
>
>David
>
>
>
>
>--- Benny boy <huotb@VIDEOTRON.CA> wrote:
>
>
>
>>Hi David, i a'm the one who told so about me stop checking all new COFAP
>>pistons kit. I have checked more than 10 before i stop checking, i still do
>>it once in a wile. As for now, i had good result with those and nothing bad
>>to say about it.
>>
>>150 sound very good for news one, 90 is kind of strange, even if all ring
>>gap were align, you should be close to your 150, have a leak down test done,
>>no way out. I would blame the EX valve on that #3... but hey, who knows!!!
>>
>>Ben
>>
>>On Sun, 3 Jun 2007 11:44:58 -0700, David Kao <dtkao0205@YAHOO.COM> wrote:
>>
>>
>>
>>>Before I dropped the engine to replace the liner the #1 and #3 had a
>>>
>>>
>>compression
>>
>>
>>>of 90 PSI only. The engine consumed a lot of oil and was powerless before the
>>>the rebuild. All other 2 were around 120 only. I believed I needed a new set of
>>>liner.
>>>
>>>I checked quite carefully the heads before installing them. They were put on my
>>>westy by a VW dealer 30k miles ago. I also have a set of used AMC heads for
>>>comparison. The rebuilt heads from VW showed virtually no valve guide wear and
>>>no damage that can be visually seen.I lapped them really well and my alcohol
>>>leak test showed no leak before I put them on.
>>>
>>>Do you think I still need more miles to make the rings on #3 to seat? I
>>>
>>>
>>have had
>>
>>
>>>only 250 miles on them. Am I worrying anout it too early?
>>>
>>>David
>>>
>>>
>>>
>>>
>>>
>>>
>>>--- Kenneth Lewis <kdlewis@NORTHSTATE.NET> wrote:
>>>
>>>
>>>
>>>>David,
>>>>What was the compression before you started? A leakdown test might narrow
>>>>down the problem area. For instance, the exhaust valve might be going out of
>>>>round.
>>>>
>>>>Ken Lewis
>>>>http://neksiwel.20m.com/
>>>>Vanagon mods, tech info and O2 sensor help
>>>>O2 Sensor monitoring Gadget sold here
>>>>
>>>>
>>>>
>>>
>>>
>>>
>>>
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>>
>>
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>
>
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