[Vwdiesel] Blow-by test?

[Joe]

Ark, your answers are certainly the most entertaining!  And yes, I've got a
leaker which needs a quart every 500 miles (not km) and whose oil turns
black almost instantly so I guess I'm looking at a rebuild sometime... Or
perhaps sale?  I doubt if I'll get this car past PA inspection this year,
due to rust alone.  I'll find out soon enough.

Thanks again to all replies,

Joe

 

-----Original Message-----
From: vwdiesel-bounces at vwfans.com [mailto:vwdiesel-bounces at vwfans.com] On
Behalf Of Arkady Mirvis
Sent: Wednesday, August 18, 2010 2:25 AM
To: LBaird119 at aol.com; vwdiesel at vwfans.com
Subject: Re: [Vwdiesel] Blow-by test?

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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> Vwdiesel mailing list
> Vwdiesel at vwfans.com
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