Date: Thu, 26 Jan 2006 18:45:36 -0500
Reply-To: Jonathan Farrugia <jfarrugi@UMICH.EDU>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Jonathan Farrugia <jfarrugi@UMICH.EDU>
Subject: Re: Compression Test
In-Reply-To: <43DA9B43.80401@videotron.ca>
Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
okay you ready for my guess at why this has been the case on all the
boxers i have done a compression test on? i think it is due to the main
bearings near the flywheel getting beat out of round. the excess slop in
the crank allows (over time) the rods to move at a greater angle relative
to the bore thus wearing the rings on those two cylinders. this is part
of the reason that i suggest doing a line bore when ever you do a rebuild
on a boxer.
now the question i have for all you old air cooled wrench types is... is
the same pattern of low compression in the two cylinders nearest the
flywheel the same as in the boxer? maybe we can even get a comment or two
from boston bob on the theory :).
jonathan
On Fri, 27 Jan 2006, Ben wrote:
> Yeap... they seem to be the the weak one's
>
> Cheers, Ben
>
> Jonathan Farrugia wrote:
>
>> ben
>>
>> just curious if you see the same thing as me when you do wasserboxer
>> compression tests. do you always seem to get lower readings on the
>> two cylinders closest to the flywheel? that would be cylinders 1 and 3.
>>
>> jonathan
>>
>> On Fri, 27 Jan 2006, Ben wrote:
>>
>>> ****************************************************
>>> Larry Chase wrote:
>>>
>>> Bro,
>>>
>>> Do you have a short write up on your site on the proper way to check
>>> compression.
>>> I've looked everywhere but can't find anything.
>>> BTW .... when do we see photos frm the Keys trip 06.
>>>
>>> ***************************************************
>>>
>>>
>>> http://pages.infinit.net/eurokit/floride2006.htm (sexy pictures of me
>>> included)
>>>
>>> Compression test:
>>> -Remove all plugs
>>> -Disconnect (mark them) every wires on the "coil" (left side firewall)
>>> (just to be safe)
>>> -Insert the compression tester in plug hole
>>> -Gas pedal to de floor (to let air IN)
>>> -One guy inthe front cranking the engine and holding the gas pedal
>>> -One guy in the back checking the gage until this one stop going up (i
>>> hope for you), just a few turn of the engine is enough
>>>
>>> -If compression is low, put 2 spoon of oil into cylinder, test again, if
>>> higher,
>>> cylinder/pistons problem, if nothing happen, heads proplem...
>>>
>>> Should be around 125-150PSI (forget the 160+, inyour dream)
>>>
>>> Cheers, Ben
>>> http://www.benplace.com/
>>>
>>>
>>>
>>
>>
>
>
>
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