Re:

[Peter Roberts]

Hi Bob! Your pressure levels certainly agree with what I read in my TC. I had the valve train rebuilt last Winter after about 25 years of moderate use. Top end pressure rose from 50-55 psi to 60-65 psi, hot. Idle (700 rpm) hovers around 35-40 cool and 15-20, hot. I have just received a Packet on Penrite Auto Lubes from Classic Auto Lubes (jfm@spyderinternet.com), with a specification sheet for MG models from 1929 through 1976. The discussion in the packet makes the point that modern, multiviscosity, oils are thinner than those specified for our engine, contain additives that were unknown when the engine was built, and produce viscosities across a range of temperatures that were never contemplated when our engines were built. On reflection, about the only thing they mention that might have some value is the "thickness" of modern oils. I believe we all have encountered the remarkable difference between dino oil and synthetic oil in this regard. (My persistent front seal leak miraculously healed itself when I switched from Mobil 1 to a 10w30 dino oil.) Although, the thickness issue seems counter-intuitive to the "flow" requirement, I wonder if the flow requirement is somewhat moot in the relatively open tolerances of our engines? BTW, Penrite Steering Box Lube is $10.95 for a 500ml bottle. _Peter

----- Original Message ----- From: "Bob Grunau" grunau.garage@sympatico.ca> To: "Mark Stolzenburg" stolzy40@sbcglobal.net>; "John Patterson" jwp_mgtc@chartermi.net>; "T-ABCs Forever" mg-tabc@yahoogroups.com> Sent: Tuesday, August 16, 2005 9:07 AM Subject: RE: [mg-tabc] > Hi Mark, > I like to see 50 to 60 psi hot running down the road at 3500 to 4200 rpm. > My > comfort level mninimum of 40 psi is also at 3500 to 4200 rpm. I really > don't > care what idle oil pressure reads, but 20 psi or above is good. > > I'm waiting for the response from members who will swear that the car only > needs 5 psi oil pressure as flow is more important than pressure. Some > truth > to that. To those with lower than recommended oil pressure, I dedicate the > following verse written by W.H.Charnock, titled O.P. > > O.P. > "Oil pressure at two thousand, hot, is forty pounds or so, > And if it is not forty pounds, your motor will not go." > Thus spake the learned makers in their clever little book, > And so, at that small instrunment, I seldom dare to look. > > Sometimes on biting winter morn, when bitter frost abides, > The needle crawls to shaky ten, then sleepily subsides; > Oh clueless clot though I may be, is not this car a hero, > Have we not gone ten thousand miles, oil pressure, hot, at zero? > > > The Collected Motoring Verses of W.H.Charnock was originally published in > hard cover in 1959 and is difficult, and expensive, to find. However a > re-print titled Harry Charnock's Motoring Verse was published in 2002 as a > soft cover book. UK price was 7.50 pounds, cheap and a good book if you > can > find it. No doubt also out of print?? > > Bob Grunau > > > > Bob, At what RPM are you suggesting 50 to 60 psi hot? I take it you are > suggesting the minimum 40 psi at idle? > Mark Stolzenburg > St. Louis, Missouri > TC 7812 >> John, >> I'd suggest using 20W-50 oil, 10W-30 is really too light for our XPAG >> engines. Cold oil pressure should be about 70 psi. I like to see 50 to 60 >> psi hot. My minimum hot pressure to run is 40 psi, but I hate to see it > that >> low. >> Regards, Bob Grunau > > > > > Yahoo! Groups Links > > > > > >