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<DIV>Marty, I experienced low to no oil pressure at idle on my 4A street
car several years ago, and what fixed it for me was new rod bearings and mostly
I think was a close inspection of the oil pump and maintaining those clearances.
So new rotor assembly and a careful removal of all of the scratches and worn
areas of the bottom plate on the pump where the rotors set. Emery paper and a
flat piece of glass and a lot of hand work getting it flat. I am assuming the
oil pump is similar to a 4a pump in it’s construction. Many highway miles later
hot idle is 30 or above and at 3000 rpm it’s been a steady 65 to 70 pounds.
Maybe look there if you haven't already done so.</DIV>
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<DIV>JVV</DIV>
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<DIV style="font-color: black"><B>From:</B> <A title=bschirano@yahoo.com
href="mailto:bschirano@yahoo.com">Brian Schirano</A> </DIV>
<DIV><B>Sent:</B> Wednesday, July 13, 2016 8:12 AM</DIV>
<DIV><B>To:</B> <A title=trmarty@hotmail.com
href="mailto:trmarty@hotmail.com">'marty'</A> ; <A title=fot@autox.team.net
href="mailto:fot@autox.team.net">FOT List</A> </DIV>
<DIV><B>Subject:</B> Re: [Fot] Oil Pressure Conundrum</DIV></DIV></DIV>
<DIV> </DIV></DIV>
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<DIV id=yui_3_16_0_1_1468327401121_163568 dir=ltr><SPAN
id=yui_3_16_0_1_1468327401121_163255>Marty, I think Peter is right. The GT motor
I am about to rebuild had similar symptoms. Great pressure cold, 75-80, then
dropping to 20-25 hot at idle, sometimes less and I had to keep RPMs up to
ensure lubrication. Uppon teardown, I had a a couple of big end rod bearings
showing some copper, and others indicating wear also, all on the compression
stroke side (opposite side of oil journal). Mains were all OK. I run street
Mobil One 15-50, but think I will change after rebuild.</SPAN></DIV>
<DIV id=yui_3_16_0_1_1468327401121_163838 dir=ltr><SPAN
id=yui_3_16_0_1_1468327401121_163255><BR></SPAN></DIV>
<DIV dir=ltr><SPAN id=yui_3_16_0_1_1468327401121_163255>Would welcome a few race
oil opinions from FOT</SPAN></DIV>
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<DIV id=yui_3_16_0_1_1468327401121_163374> </DIV>
<DIV id=yui_3_16_0_1_1468327401121_163739>Best</DIV>
<DIV id=yui_3_16_0_1_1468327401121_163760>Brian<BR></DIV>
<DIV id=yui_3_16_0_1_1468327401121_163376> </DIV>
<DIV id=yui_3_16_0_1_1468327401121_163378>26A GT6+, 28 TR6</DIV></DIV>Brian
Schirano<BR>585-305-0349 Cell <BR>BSchirano@yahoo.com</DIV>
<DIV id=yui_3_16_0_1_1468327401121_163346 class=qtdSeparateBR><BR><BR></DIV>
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<B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> Peter Vucinic
<pvucinic@netspace.net.au><BR><B><SPAN
style="FONT-WEIGHT: bold">To:</SPAN></B> 'marty' <trmarty@hotmail.com>;
'FOT' <fot@autox.team.net> <BR><B><SPAN
style="FONT-WEIGHT: bold">Sent:</SPAN></B> Tuesday, July 12, 2016 9:54
AM<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> Re: [Fot] Oil
Pressure Conundrum<BR></FONT></DIV>
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<DIV class=yiv0474239424MsoNormal><SPAN
style="FONT-SIZE: 11pt">Marty,</SPAN></DIV>
<DIV class=yiv0474239424MsoNormal><SPAN style="FONT-SIZE: 11pt">Sounds like some
of the bearings clearances are larger than they should be and you are losing oil
pressure as the oil warms up and starts leaking through the journal(s) faster
once you are at operating temps. </SPAN></DIV>
<DIV class=yiv0474239424MsoNormal><SPAN style="FONT-SIZE: 11pt">If you are
running an aggressive cam profile and/or high valve spring rates? This will
adversely affect cam bearing wear for sure.</SPAN></DIV>
<DIV class=yiv0474239424MsoNormal><SPAN
style="FONT-SIZE: 11pt"></SPAN> </DIV>
<DIV class=yiv0474239424MsoNormal><SPAN
style="FONT-SIZE: 11pt"></SPAN> </DIV>
<DIV class=yiv0474239424MsoNormal><B><SPAN style="FONT-SIZE: 11pt">"You can Make
a Small Fortune From Motor Racing. As long as You Started With A Lage
Fortune!"</SPAN></B></DIV>
<DIV class=yiv0474239424MsoNormal><SPAN style="FONT-SIZE: 11pt">Kind
Regards</SPAN></DIV>
<DIV class=yiv0474239424MsoNormal><SPAN style="FONT-SIZE: 11pt">Peter
Vucinic</SPAN></DIV>
<DIV class=yiv0474239424MsoNormal><SPAN style="FONT-SIZE: 11pt">TR4 - TR7 V8 -
Spitfire MkII</SPAN></DIV>
<DIV class=yiv0474239424MsoNormal><SPAN
style="FONT-SIZE: 11pt">_______________________________________________</SPAN></DIV>
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<DIV id=yiv0474239424yqt20896 class=yiv0474239424yqt6998646359>
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<DIV
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<DIV class=yiv0474239424MsoNormal style="MARGIN-LEFT: 36pt"><B><SPAN
style="FONT-SIZE: 10pt">From:</SPAN></B><SPAN style="FONT-SIZE: 10pt"> Fot
[mailto:fot-bounces@autox.team.net] <B>On Behalf Of </B>marty<BR
clear=none><B>Sent:</B> Tuesday, 12 July 2016 4:09 AM<BR clear=none><B>To:</B>
FOT<BR clear=none><B>Subject:</B> [Fot] Oil Pressure
Conundrum</SPAN></DIV></DIV></DIV>
<DIV class=yiv0474239424MsoNormal style="MARGIN-LEFT: 36pt"> </DIV>
<DIV>
<DIV class=yiv0474239424MsoNormal style="MARGIN-LEFT: 36pt"><SPAN> </SPAN>
<SPAN></SPAN></DIV>
<DIV class=yiv0474239424MsoNormal
style="MARGIN-BOTTOM: 8pt; MARGIN-LEFT: 36pt; MARGIN-RIGHT: 0cm">I could use
some opinions. Some history. Spitfire small journal 1296 engine, rebuilt 6 race
weekends ago included all new bearings. I tore it down this spring to check it
over prior to last weekend PVGP event. Cam and crank end floats were to spec.
Rod and main bearings checked between .002 and .003 clearance. I do not have the
actual numbers in front of me at the present. Cam bearings appeared to have some
slight visual wear at the bottoms but I did not actually measure them. I run
Brad Pen 20W50. Oil temps run 210 and water temps run 190. EGT are 1200/1250
range on track. I was fighting low oil pressure at running temps all weekend.
Once my oil temps come up on track the pressure drops down to 35psi. If I add
enough springs to the pressure relief valve I see over 125 psi cold so I am
thinking my pump is putting out enough pressure. I tried shimming to get 50/60
cold at idle and it drops to 35 at operating temps at 7000 rpm. I tried a new
pressure gage over the weekend and the numbers did not change. I am currently
running an auxiliary oil line to the head, I removed it at one point over the
weekend and it had no effect. I tried a new pressure relief valve assy and it
had no effect. I believe this situation actually started a season ago
because I added a washer to the pressure relief valve last season. I’m
thinking it most likely is cam bearing wear even though all the bearings were
fresh 6 events ago. Any guidance? One thing I did learn this weekend is my
accusump pressure gage is incorrect. It was reading about 30 psi higher
that my dash gage. I was thinking it was probably correct and my dash gage was
wrong until I replaced my electric dash gage with a mechanical gage and its
reading matched the gage I just disconnected. Oil pressure readings are taken at
the port below the distributer. </DIV>
<DIV class=yiv0474239424MsoNormal
style="MARGIN-BOTTOM: 8pt; MARGIN-LEFT: 36pt; MARGIN-RIGHT: 0cm"> </DIV>
<DIV class=yiv0474239424MsoNormal
style="MARGIN-BOTTOM: 8pt; MARGIN-LEFT: 36pt; MARGIN-RIGHT: 0cm">Side note. Car
ran awesome. I ran a 2.22 at PittRace Sunday and that was 6 seconds faster than
my previous best lap there. </DIV>
<DIV class=yiv0474239424MsoNormal
style="MARGIN-BOTTOM: 8pt; MARGIN-LEFT: 36pt; MARGIN-RIGHT: 0cm"> </DIV>
<DIV class=yiv0474239424MsoNormal
style="MARGIN-BOTTOM: 8pt; MARGIN-LEFT: 36pt; MARGIN-RIGHT: 0cm">Thanks,</DIV>
<DIV class=yiv0474239424MsoNormal
style="MARGIN-BOTTOM: 8pt; MARGIN-LEFT: 36pt; MARGIN-RIGHT: 0cm">Marty
</DIV></DIV></DIV></DIV></DIV></DIV>
<DIV> </DIV>
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