Your presssure is about what is to be expected. The Rover motor does not make
high pressures. I am not aware of a kit to increase the output of the late
model cam driven pump. The kits that I am aware of were to increase the gear
length of earlier versions. You can increase the pressure by increasing spring
pressure on the relief valve, but be careful. You just eat up power and
increase strain on the gear drive which is a weak point. The bottom end is
pretty stout. John
BROWN DAVID E (DAVE) wrote:
> I used my existing 3.5 heads on my 4.6 block, but I
> had them ported first. I don't know what the stats are for the 4.6 heads.
>
> I haven't been able to post to the list, but I'll
> try again:
> I have a 4.6 Rover block with '87 (3.5L) front cover
> and oil pump. Is there a high output oil pump that I can buy to fit this?
> I guess the block is unimportant, since the pump is entirely in the cover,
> right?
>
> I recently installed an oil gauge and discovered
> that my NEW (well, 17K miles now) 4.6 block is only getting 8-10 psi at
> idle. I reused all the 3.5L components, front cover, intake, heads
> (ported), etc. So my oil pump actually has 130K miles on it. I think this
> is the "newer" style oil pump with the taller gears - but is there anything
> more I can do to increase oil pressure?
>
> I haven't taken it apart yet, so I don't know if the
> bottom plate is worn, or gear(s) worn. I have a "rebuilding kit" but all
> that has is new bypass spring and strainer screen, nothing that will
> increase low rpm pressure. My cruise pressure is around 35-40psi, so not
> too bad.
>
> What can I do to beef up the 3.5L oil pump?
>
> Regards, Dave...
> Phone: 602-236-3544 Fax: 602-236-2303
> 6:00 AM - 4:30 PM Mon-Thurs, Off Fridays
> E-mail: debrown@srpnet.com
> <mailto:debrown@srpnet.com> * AM/FM <http://www.srpnet.com/>
> Much of our work should be about planting seeds, not
> putting out fires.
> - Unknown
>
> -----Original Message-----
> From: Susan and John Roper
> [mailto:vscjohn@huntnet.net]
> Sent: Thursday, August 31, 2000 6:48 PM
> To: FOSmith@aol.com
> Cc: fab@dcs.warwick.ac.uk;
> buick-rover-v8@autox.team.net
> Subject: Re: Rover blocks
>
> Fred, the new heads have a chamber that ccs
> 28-31. Just did mine, 29 to 29.5. SD1 heads are about 36cc, about 1/2
> point compression diff. New heads have a litle biger ports, but less than
> 10% diff. Valves are the same size. John
>
> FOSmith@aol.com wrote:
>
> > Franc Buxton <fab@dcs.warwick.ac.uk>
> writes:
> > In general, what are the specification and
> feature differences
> > > between 3.9 s and 4.0 s? Are they the
> same bore and stroke dimensions?
> > > This is one little part of the Rover
> puzzle I would like to learn more
> > > about.
> > Hi all, I'm new to this list. I have a
> TR8 for which I'v just purchased a '98 Rover 4.0 short block (with cross
> bolted mains)to replace my 3.5. I'm now pondering what to do about heads,
> etc. My question is this... Besides the deletion of the lower row of holes
> for the head bolts, what are the differences between the 4.0 and 4.6 heads
> and the earlier (SD1 type) heads. Is the combustion chamber size the same?
> How about the flow characteristics and valve sizes? Do the 4.0 and 4.6
> engines use the same heads? If the newer heads are a significant
> improvement I want to try to track down a pair. If not, I'll just use the
> heads from my 3.5. Any information would be greatly appreciated. Thanks,
> >
> > Fred Smith
> > Orinda, CA
> > > T I A.
> > >
> > > Regards,
> > >
> > > Dave Kernberger
> > >
> >
> > I have just checked with some local
> Rover contacts of mine, and
> > for general information, the difference
> between 3.9 and 4.0 engines is
> > this:
> >
> > The 'interim' engine is a 3.9 -
> actually 3947cc, with some of the
> > improvements applied to the 4.6, namely
> the same 'crossbolter' block, but
> > without the crossbolt holes being drilled.
> It may or may not have main
> > bearing caps suitable for crossbolting,
> some of the earlier ones had old
> > pattern caps which did not sit flush with
> the sides of the housings, so
> > nowhere to drill the holes. (I know that
> bit from experience!) The main
> > journals are of the smaller size, despite
> the common block with the 4.6.
> > The 'interim' front cover has the
> new-design concentric oil pump on the
> > crank nose, but has a distributor hole. A
> worthwhile modification to any
> > Rover V8, if you ask me! (see website).
> This engine came equipped with
> > Lucas type 14CUX 'hotwire' fuel injection.
> >
> > The '4 litre' engine is the
> fully-evolved version, distributorless
> > and with the large-journal crank. Capacity
> is the same at 3947cc, as are
> > bore (94mm) and stroke (71mm). This one
> uses the Lucas 'GEMS' engine
> > management system.
> >
> > Hope this helps/informs!
> >
> > Regards,
> > Franc.
> >
> > (Have I ever contributed here before,
> or just lurked? If the latter,
> > Hi, guys, interesting reading - keep 'em
> coming!) F.
> > --
> > W------W
> > WW--- ---WW fab@dcs.warwick.ac.uk
> > W(-(+)^^(+)-)W
> > (| L |)
> fab@StunnedBuffalo.com
> > \ /WW\ /
> > X\____/X tel.: +44 (0)705 060
> 4-FAB
> > XXXXXX (+44 (0)705 060
> 4 322)
> > XXXX
> http://www.StunnedBuffalo.com
> > >>
>
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