[ROVERNET - UK] Re: Rover P5 compression ratio and fuel
p6rovers at yahoo.com
Fri Aug 10 02:42:41 BST 2007
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.
--- 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
> > acquired a new (for him) 3 Litre Rover. He has a
> > question about engine compression and fuel needs.
> > you give him some idea? I'll pass the answer
> > Geoff Murgatroyds P5 could be a 7.5:1 or and
> > compression ratio car and I dont know how to make
> > 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
> > 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:
> 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 That is an outdated page, photo-wise, and the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
> rovernet mailing list
> rovernet at lyris.ccdata.com
> To unsubscribe, go to this web page, look near the
> bottom and follow instructions:
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