[ROVERNET - UK] Rover P5 compression ratio and fuel

[Eric Russell]

Steve,
Thanks very much.
I'll send your messsage off to Bill.

Eric

--- S Manwell <s_manwell at alum.swarthmore.edu> wrote:

> Eric,
> 
> According to the P5 MkI through III parts book,
> these are the possibilities:
> 
> MkI and Ia: 7.5 (engine # prefix 631 or 731) or
> 8.75:1 (prefix 630 or 730)
> MkII Auto: 8.0:1
> MkII 4spd/OD: 8.0 (prefix 771) or 8.75 (770)
> MkIII 4sp: 8.0 or 8.75 (796 or 795)
> MkIII auto: 8.0 or 8.75 (801 or 800)
> 
> I believe the 8.75 ratio is more common on the LHD
> export MkII 4spd and 
> MkIII's, but I'm not sure of that.
> 
> If the pistons have been replaced, then the
> compression ratio may have 
> changed...
> 
> 8.75 pistons probably require 89 or 93 octane
> depending on where the 
> spark is set.
> 
> --Steve
> 
> 
> Eric Russell wrote:
> > One of club members in eastern Washington state
> has
> > acquired a new (for him) 3 Litre Rover.  He has a
> > question about engine compression and fuel needs. 
> Can
> > you give him some idea?  I'll pass the answer
> along.
> >
> >  Geoff Murgatroyd’s P5 could be a 7.5:1 or and
> 8.5:1
> > compression ratio car and I don’t know how to make
> the
> > determination.  Since this affects the type of
> > gasoline to use in the engine, it is something
> that I
> > need to know.
> >
> > Question:  How does a person determine if a 3
> Litre
> > engine has a 7.5:1 ratio or a 8.5:1 ratio?
> >
> > Eric
> >
> >
> > Webmaster of The Rover Car Club of Canada
> > Website:  http://www.roverclub.ca/
> > Webmaster of a variety of sites from:
> > http://www.websrus.ca
> >
> >
> >        
> >
>
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Webmaster of The Rover Car Club of Canada
Website:  http://www.roverclub.ca/
Webmaster of a variety of sites from:
http://www.websrus.ca


       
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