SpitListers,
remember that the Spitfire has an oil pressure bypass
valve built into it. ISTR 70 psi is the spec.
Except for the pumping power losses, there should be
no problem with excess pressure.
There is a procedure mentioned in the Factory Shop
Manual for adjusting pressure with shims, and the Comp
manual suggests lapping the bypass valve/seat assembly
to get a good seal.
Though I have built many Spifire motors, both stock
and comp, I have never performed this procedure.
I do plan to pay close attention and do this when I
build the bottom end of my turbo 1500. The turbo needs
additional oil, so I want to use a GT6 pump.
Carter Shore
--- Craig Smith <CraigS@iewc.com> wrote:
>
> High volume is relative.
>
> My rebuilt 71 runs 75 cold and 20 hot.
> High volume is relative.
> At 7,500 RPM 20 PSI is still a positive.
> What do you need ?
> A reading of any kind is usually taken from right
> off the pump below the
> dizzy.
>
> 20 PSI @ 10,000 RPM or 20 PSI @ 7,500 RPM
> Same thing
>
> More PSI doesn't equate to squat
>
> There is a foaming quotient at high RPM, but I don't
> think ANY Triumph has
> to worry about that !
>
>
> -----Original Message-----
> From: Max Brewster [mailto:brewsjl@hotmail.com]
> Sent: Tuesday, January 09, 2001 10:49 PM
> To: sos@kymtnnet.org; spitfires@autox.team.net
> Subject: Re: High Volume Oil Pump
>
>
>
> Larry, I rebuilt my 79 1500 last spring with a stock
> pump. 75 psi cold, 45
> psi hot at speed, and 20 psi at idle when hot. This
> is plenty of oil
> pressure. Be careful with too high a psi you could
> blow out oil filters
> unless you can get high pressure one. I don't know
> if they are available for
>
> the 1500. You can also stress the oil pump drive
> shaft,
> although the 1500 shaft is pretty hefty. If you go
> with a high volume pump,
> let your engine warm up for a while before getting
> on it. I ran across the
> filter problem on my 68 Mustang with a high volume
> pump. It pegged my 100
> psi oil pressure gage when cold and I did blow out a
> stock filter. It came
> apart at the seams!! The high pressure filter fixed
> this problem.
>
> Good Luck,
> Max Brewster
> 79 Spitfire 1500
>
>
> >From: Larry Elswick <sos@kymtnnet.org>
> >Reply-To: Larry Elswick <sos@kymtnnet.org>
> >To: Spitfires mailing list
> <spitfires@autox.team.net>
> >Subject: High Volume Oil Pump
> >Date: Mon, 08 Jan 2001 14:43:47 -0500
> >
> >I'm just about ready to start re-assembly of
> >my 1500 engine. I was told a high volume oil
> >pump isn't really necessary. I had the center
> >oil gallery drilled out to 5/16" . How about
> >some opinions. Thanks!
> >Larry
>
>
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