Bob,
As it was explained to me, the 20 is the pour index when cold and the 50 is
the load bearing when hot. In short, the running pressure would be the most
important. I know that when the engines are built for racing, and the oil
passages are fully modded as well as the pump, the OP isn't that high. It
has a different engine, but my Tiger only has about 20 psi at idle and 50
at full chat because of the clearanced rods. Since all of the engines that
I have stuffed into the Tigers have been modded, all have had about the
same OP, and all have proven very reliable.
I have a friend at Pennzoil who may be able to get me a list, but I suspect
that it would favor the Pennzoil brand.If I can find something else out, I
will let you know.
I know that Valvoline once had a foaming problem at high rpm, but I assume
that that problem is history.
How about you petroleum engineers out there? There must be at least 2 of
you guys left in Houston.
Regards, Ray
At 04:19 PM 11/18/97 EST, ROBERT G. HOWARD wrote:
>
>On Tue, 18 Nov 1997 14:06:58 -0600 Ray McCrary <spook01@mindspring.com>
>writes:
>Ray,
> Is the 20/50 then a rating of the load bearing index when oil is hot
>and the 20 the index of cold oil dripping out of the engine?
> Have you any load bearing index ratings of various oils to compare?
>Bob
>
>>Back to something of importance; I called the friendly folks at
>>Castrol
>>about the oil pressure difference between the Valvoline and Castrol.
>>It
>>appears that the oils are rated as to the load bearing ability at
>>operating
>>temp range and not at the pour index when hot. When cold, they are
>>rated
>>at only the pour index. It appears tht the load bearing index is the
>>most
>>important thing, both hot and cold. I cannot swear to the above, but a
>>similar story was told by the guys at Pennzoil.
>>
>>Regards, Ray
>>
>> At 09:37 PM 11/11/97 -0500, Trevor Boicey wrote:
>>>Ray McCrary wrote:
>>>>
>>>> Phillippe,
>>>>
>>>> There are some terminally sensitive people out there....or is that
>>>> 'thenthative'? Oops.
>>>
>>> Great. Like we don't have enough nut cases on this list
>>>now we have a resident homophobe.
>>>
>>>--
>>>Trevor Boicey
>>>Ottawa, Canada
>>>tboicey@brit.ca
>>>http://www.brit.ca/~tboicey/
>>>
>>
>
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