[DeTomaso] Oil Pump Pressure

Will Kooiman will.kooiman at gmail.com
Thu Jan 31 14:57:14 EST 2013 

Until the clearances are too great for the pump to keep up with the leaks.

Otherwise, worn engines wouldn't show low oil pressure.

--
Will





On 1/31/13 2:55 PM, "shawkins777 at comcast.net" <shawkins777 at comcast.net>
wrote:

>Yes it would but, so would a standard volume pump.
>
>Steve 
>
>----- Original Message -----
>From: "Will Kooiman" <will.kooiman at gmail.com>
>To: "Julian Kift" <julian_kift at hotmail.com>, thomas at hax.se,
>detomaso at poca.com 
>Sent: Thursday, January 31, 2013 1:22:35 PM
>Subject: Re: [DeTomaso] Oil Pump Pressure
>
>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
>>> > _______________________________________________
>>> > 
>>> > Detomaso Forum Managed by POCA
>>> > 
>>> > DeTomaso mailing list
>>> > DeTomaso at poca.com
>>> > http://poca.com/mailman/listinfo/detomaso
>>> > _______________________________________________
>>> > 
>>> > Detomaso Forum Managed by POCA
>>> > 
>>> > DeTomaso mailing list
>>> > DeTomaso at poca.com
>>> > http://poca.com/mailman/listinfo/detomaso
>>> > 
>>> > !DSPAM:510a0c75287182419826346!
>>> > 
>>> 
>>> 
>>> -- 
>>> 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
>>> 
>>> _______________________________________________
>>> 
>>> Detomaso Forum Managed by POCA
>>> 
>>> DeTomaso mailing list
>>> DeTomaso at poca.com
>>> http://poca.com/mailman/listinfo/detomaso
>> 
>>_______________________________________________
>> 
>>Detomaso Forum Managed by POCA
>> 
>>DeTomaso mailing list
>>DeTomaso at poca.com
>>http://poca.com/mailman/listinfo/detomaso
>
>
>_______________________________________________
>
>Detomaso Forum Managed by POCA
>
>DeTomaso mailing list
>DeTomaso at poca.com 
>http://poca.com/mailman/listinfo/detomaso
>_______________________________________________
>
>Detomaso Forum Managed by POCA
>
>DeTomaso mailing list
>DeTomaso at poca.com
>http://poca.com/mailman/listinfo/detomaso

More information about the DeTomaso mailing list