[ROVERNET - UK] Re: Rover P5 compression ratio and fuel

[Eric Russell]

Thanks Jim,
I'll forward your page to Bill.  He wanted to extend
his appreciation to Steve and I'm sure he'll do the
same to you.

Eric

--- j <jhdolan at sover.net> wrote:

> 
> > Message: 4
> > Date: Wed, 8 Aug 2007 17:16:40 -0700 (PDT)
> > From: Eric Russell <p6rovers at yahoo.com>
> > Subject: [ROVERNET - UK] Rover P5 compression
> ratio and fuel
> > To: Rovernet at lyris.ccdata.com
> > Message-ID:
> <569449.57850.qm at web34308.mail.mud.yahoo.com>
> > Content-Type: text/plain; charset=iso-8859-1
> > 
> > 
> > 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
> 
> > 
> > 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
> 
> 
> Hi Eric and Steve-
>   I have a chart of P5 models which includes
> compression ratios here:
> http://www.sover.net/~jhdolan/p5%20page.htm
> The info there and Steve's provision of engine
> prefix numbers might 
> help. If you'd like any numbers looked up for a P5,
> just let me know.
>   Been well here in Vermont, and hope this finds all
> the same. Time 
> flies- just the other day I was remembering when
> Rovernet had 6 members- 
> how it has grown! I still follow it, but, as you can
> tell, mostly just 
> lurk. That is an outdated page, photo-wise, and the
> vehicle is no longer 
> for sale.
> jim in VT
> '61 LR SWB
> '60 P5 MkI LHD 4 spd w/OD
>    and a few other P5's
> 
> 
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> 


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Website:  http://www.roverclub.ca/
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