[Vwdiesel] Lorens specs toooo Stringent

[Gary Shea]

Last fall I got a new set of pistons for my '85 1.6 TD.  Right on top of
the piston it says .001.

        Gary

On Mon, 27 Sep 2004, at 16:53 [+0100], Mark Shepherd (mark at shepher.fsnet.co...:

> Now I'm all lost! 
> 25.4 mm to 1"
> 1 thou = 25.4/1000 
>            =0.0254mm
> 
> 1mm is 1/25.4  of1000 thou...
>  or  39.4 thou
> 
> 0.03mm is 39.4 x 3/100
> or  1.2 thou
> 
> So the Haynes is wrong for piston to cylinder gap ...
> 
> BUT is a 1 thou gap correct?...  0.5 of a thou on the radius!!! or were the conversions to imperial measure wrong from a metric engine...
> Although in this case (haynes ) its the metric that I'd say is out....
> Oh hell I dunno... This looks like an interesting debate that might get me to change oil from the misers 'Walmart' brand to something decent... perhaps my economy will go up from 69mpg imp to challenge Hagars 70's
> 
> With a gap that small isnt there a risk of seizure? Is this what makes lube viscosity crucial?
>   ----- Original Message ----- 
>   From: LBaird119 at aol.com 
>   To: mark at shepher.fsnet.co.uk ; vwdiesel at vwfans.com 
>   Sent: Monday, September 27, 2004 3:49 PM
>   Subject: Re: [Vwdiesel] Lorens specs toooo Stringent
> 
> 
>     Ok, from Bentley this time:
>     Piston to cylinder clearance, new  .03mm (.001")
>     Wear limit .07mm (.0025")
> 
>     I think maybe you mean TEN thou. :)
>        Loren
> 
>   In a message dated 9/27/2004 2:54:31 AM Pacific Standard Time, mark at shepher.fsnet.co.uk writes:
> 
> 
>     According to Haynes:
>     Cylinder to Piston gap
> 
>     New part 0.03mm (11 thou)
>     Wear limit 0.07mm (27 thou)
> 
>     Perhaps Loren's engines run without rings :oD
> 
>     Ring wear (gap) 12 to20thou
>     wear limit  1mm (39thou)
> 
> 
> 
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