[DeTomaso] Oil Pump Pressure

Thu Jan 31 14:22:35 EST 2013

But wouldn't a high volume pump more if the engine is worn - I.e. Greater
tolerances?  So, it should make up for loose bearings.

BTW, my understanding is a 351C pump is already the largest of the classic
Ford V8s, including the 429/460 and FEs.

--
Will

On 1/31/13 11:51 AM, "Julian Kift" <julian_kift at hotmail.com> wrote:

>
>Yes, oil pumps have an internal relief spring, the high pressure pump
>just uses a higher resistance spring. The actual pressure your gauge
>reads is will be is a function of tolerances in your engine, oil
>viscosity and location of the pressure sender.
> 
>Julian
> 
>
>> Date: Thu, 31 Jan 2013 08:33:13 +0100
>> From: thomas at hax.se
>> To: detomaso at poca.com
>> Subject: Re: [DeTomaso] Oil Pump Pressure
>> 
>> The "hi volume" refers to the amount of oil through the oil pump, not
>> through the engine.
>> 
>> If only the oil pump is changed, it will mean that more oil passes
>> directly back into the oil pan through the bypass, and as a hi volume
>> pump takes more power from the distributor gear, it means more wear and
>> more heat.
>> 
>> Thomas
>> 
>> 2013-01-31 07:16, shawkins777 at comcast.net skrev:
>> > I think the term Hi-volume is misleading, if nothing else is changed
>>in an engine but the oil pump, you can't increase volume without
>>increasing pressure.
>> >
>> > Steve
>> >
>> > ----- Original Message -----
>> > From: "michael at michaelshortt.com"<michaelsavga at gmail.com>
>> > To: detomaso at poca.com
>> > Sent: Wednesday, January 30, 2013 10:07:46 PM
>> > Subject: [DeTomaso] Oil Pump Pressure
>> >
>> > Worth sharing I thought.
>> >
>> > Michael Shortt
>> > ---------- Forwarded message ----------
>> > From: "Ronak, T.P. (Timothy)
>> >
>> >> Karl,
>> >> The term Hi-Output pump is not descriptive enough ... it is either
>> > Hi-Volume
>> >> standard pressure or Hi-Volume High Pressure. All you need for a
>>stock
>> > engine
>> >> is 10 Pounds of pressure for each 1000 RPM of engine speed. Any
>>pressure
>> >> beyond that and you are introducing parasitic HP losses by forcing
>>the
>> > engine
>> >> to work harder to spin the pump. The max pressure you need in a stock
>> > 6000 RPM
>> >> engine is 60 pounds when revving at 6000. I personally feel best
>>with a
>> >> minimum pressure at idle of 25-28 lbs. Unless you are starting the
>>car at
>> > -40
>> >> or you have a mechanical interference inside the pump it is not
>>likely you
>> >> will twist off the oil pump drive or excessively wear the Cam
>>distributer
>> >> drive due to the additional loads generated by the High VOLUME pump.
>> >>
>> >> I am assuming you were sold a Hi-Volume standard pressure pump and
>>the
>> >> pressure bypass spring in the pump itself will ensure you do not
>>create an
>> >> excessive oil pressure in the system. I would leave the pump alone
>>and
>> > simply
>> >> observe the oil pressure at startup. Ideally you want to run 10/30 or
>> >> equivalent synthetic oil and after breakin simply note the oil
>>pressure
>> > once
>> >> warm and know that you may be able to mitigate some of the pressure
>>by
>> > running
>> >> a thinner or lower viscosity oil like 10/20. I would not advocate a
>>'0'
>> > weight
>> >> oil as the tolerances we run on the older V8 engines are too large
>>and
>> > require
>> >> some oil wedge to develop to prevent bearing contact. It does depend
>>on
>> > the
>> >> climate you intend to operate the car and weather there will be lots
>>of
>> > COLD
>> >> sub zero starts.
>> >>
>> >> Sounded like you were looking for a recommendation ... so here it is
>>...
>> > If
>> >> you are running a Hi-Volume pump leave it in and you will be fine
>>just
>> > look to
>> >> observe that Oil pressure does not exceed 60 PSI when revving above
>>4500
>> > RPM
>> >> and that you have at least 25 pounds at idle ... If you KNOW for a
>>fact
>> > you
>> >> are running a HI-PRESSURE pump (Not a HIGH VOLUME pump) you might
>>want to
>> >> reconsider your choice. I can not imagine that you used a hi-pressure
>> > pump as
>> >> they are very difficult to obtain and are not easily purchasable
>>from a
>> > NON
>> >> performance company as they are rarely stocked or sold so most
>>likely the
>> > term
>> >> hi-output refers to Volume and NOT pressure. If you have your
>>receipt for
>> > the
>> >> pump we could look up the part number and stop speculating and
>>determine
>> > which
>> >> pump you have.
>> >>
>> >> Lunati actually recommended that I NOT EXCEED 60 PSI on my stroker
>>motor
>> > as
>> >> they said it would create too much windage at RPM inside the
>>crankcase
>> > and it
>> >> would make the oil rings work too hard to prevent oil in the
>>combustion
>> >> chamber and felt that the 58psi regulated Hi-Volume pump they sold
>>me was
>> > the
>> >> best alternative next to a dry sump.
>> >>
>> >> If you have any questions feel free to call me.
>> >> Best Regards,
>> >> Tim Ronak
>> >> Senior Services Consultant
>> >> AkzoNobel Automotive and Aerospace Coatings NA
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>> 
>> 
>> -- 
>> Real life: Thomas Törnblom Email: thomas at hax.se
>> Snail mail: Banvallsvägen 14 Phone: +46 18 32 31 18
>> S - 754 40 Uppsala, Sweden Mobile: +46 76 209 8320
>> 
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