[Vwdiesel] Blow-by test?

[Arkady Mirvis]

The best blow-by indicator is oil color change. Oils in my early days, 60 
years ago ) were very clear, light honey color. We ( I and my mentor Hans 
Joachim Augustin Freiherr Jeronim von zu Putlitz - a Luftwaffe mechaniuc at 
age 14 ) could compare fresh oil color  ( sample in 50 ml graduate ) to oil 
after 250 km. If oil was much darker, we with the help of densitometer 
estimated the blow-by. Today I wouldn't care about blow-by as long I am not 
adding into an oil leaker a quart of oil every 500 km and  not draining a 
tar.
A good oil test lab has the best answer.  Ark
----- Original Message ----- 
From: <LBaird119 at aol.com>
To: <vwdiesel at vwfans.com>
Sent: Wednesday, August 18, 2010 6:04 AM
Subject: Re: [Vwdiesel] Blow-by test?


> In a message dated 8/17/2010 2:44:14 PM Pacific Daylight Time,
> joe at haasenpfeffer.com writes:
>
>> What does this mean?  And what is an acceptable
>> amount of "percolation"?  Because my 82 Rabbit does it quite well.
>>
>
>  Actually, at an idle they seem to have more blowby than at higher
> rpms.  Could be a smoothing out of the pistions pushing air around,
> or it could be a more consistent pressure holding the rings tighter.
> There's also the issue of an overhead cam whirling around right
> below the filler cap.
>  Overall, they seem to have a lot more blowby than you'd think is
> acceptable, but it seems to be acceptable.
>   Loren
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