Re: [DML] Re: Red Oil Herring (B27 vs B28)

[Martin Gutkowski <martin@xxxxxxxxxxxxxx>]

The PRV's external design specs changed very little but the internals, 
with respect to the crank changed massively, roughly around the time of 
the Z7U Renault 2458cc single turbo unit, of which I have one. 
Subsequent Renault units, normally aspirated or forced unduction, 
carried this same bottom end and only the pistons were changed. This 
helped with the PRV's reputation as a very sturdy engine - The most 
desirable still being the 24 valve 3 litre engines which were sold as an 
option in the Citroen XM, Peugeot 605 and various big Renaults (eg the 
Laguna and Espace) but it's very easy to confuse with the later PSA 3 
litre 24v engine which is completely different and 60 degree. The PRV 
was around till 1997.

The camshafts very definitely were changed due to high rate of failure 
in the Volvo 260's in the late 70's

Martin

content22207 wrote:

>Oil passages are identical B27 to B28. Douvrin produced 2.7 and 2.8
>liter blocks side by side through 1987 (Renault Z7 series alongside
>Volvo B28). Volvo literature makes no mention of ever modifying the
>oil passages (I have both B27 and B28 manuals through 1985). Volvo
>newsgroups make no such mention either (nor do they mention "soft" B27
>camshafts). For some reason DeLorean owners love to tout their engines
>as new & improved. But the simple fact is: Douvrin only made one basic
>block unchanged 1974-1988 (dimensional differences in some components
>to accomodate varying compression ratios, cylinder displacements, etc). 
>
>I previously thought Volvo instigated redesign of the PRV into even
>fire B280 (Chrysler 3.0) for the 1988 model year. But a Peugeot
>website claims that honor goes to their 1986 Model 505.





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