Date: Tue, 27 Dec 2011 12:32:27 -0800
Reply-To: Scott Daniel - Turbovans <scottdaniel@TURBOVANS.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Scott Daniel - Turbovans <scottdaniel@TURBOVANS.COM>
Subject: Re: Compression test results for '84 Vanagon 1.9L with rebuilt
right head
Content-Type: text/plain; format=flowed; charset="utf-8"; reply-type=original
that's good ..
points more to valves then.
I commonly find the exhaust valves not sealing perfectly.
when the a head is off the engine I like to stand one on end, and fill the
exh. port with gasoline.
If it's sealing well...it'll hold that liquid for a long time...24 hrs.
if it leaks out in an hour say ...you know that valve is leaking.
The valves hang in their amazingly well...
but the exhaust valve sealing gets weak after many miles.
It's three main wear areas of course.
the heads/head gaskets are one main area ..and traditionally on opposed VW
four cylinder engines...the valves are the weakest part ..( and they are
darn good on wbxr's, compared to air-cooleds )
next .pistons, barrels , rings...those barely wear at all usually.,
Honed barrels and new rings, or a complete new set of pistons and barrels
restores a lot of sealing and power there ..but even with say 150K miles on
them ...they are usually still quite good.
the bottom end ..
bearings and oil clearance...eventually those are too worn to be safe.
1.9 wbxr bottom ends....can easily do 250K miles often. Really long-lifed
there.
have fun !
Scott
www.turbovans.com
----- Original Message -----
From: "John Lauterbach" <jhlauterbach@BELLSOUTH.NET>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Monday, December 26, 2011 10:24 PM
Subject: Re: Compression test results for '84 Vanagon 1.9L with rebuilt
right head
> Hello Scott,
>
> I added the oil as you suggested. No change. #2 stayed around 120, #1
> stayed around 90.
>
> John
>
> On Mon, 2011-12-26 at 11:53 -0800, Scott Daniel - Turbovans wrote:
>> I like to put in maybe 3 squirts..
>> then spin the engine over a time or two to swish the oil around ..
>> then check it.
>>
>> it's very typical for 3 cylinders to be in the low 100's..
>> and one to be 90-ish.
>> Not what we'd really like..but very typical.
>>
>> scott
>> ----- Original Message -----
>> From: "John Lauterbach" <jhlauterbach@BELLSOUTH.NET>
>> To: <vanagon@GERRY.VANAGON.COM>
>> Sent: Monday, December 26, 2011 10:40 AM
>> Subject: Compression test results for '84 Vanagon 1.9L with rebuilt right
>> head
>>
>>
>> > Here are the numbers:
>> >
>> > First round:
>> >
>> > #1, 105, #2, 95, #3, 120, #4, 115
>> >
>> > Retest on right head:
>> >
>> > #1, 90, 90 #2, 120, 120
>> >
>> > Engine is a Boston Engine rebuild installed September 2003. Has about
>> > 45K kilometers on it.
>> >
>> > Plugs from left head were more fouled than plus from right head.
>> >
>> > After lunch, planning to retest with a squirt of oil in each cylinder,
>> >
>> > John
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