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Marty, I think Peter is right. The GT motor I am about to rebuild had simil=
ar 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 tea=
rdown, I had a a couple of big end rod bearings showing some copper, and ot=
hers indicating wear also, all on the compression stroke side (opposite sid=
e of oil journal). Mains were all OK. I run street Mobil One 15-50, but thi=
nk I will change after rebuild.
Would welcome a few race oil opinions from FOT
BestBrian
26A GT6+, 28 TR6Brian Schirano
585-305-0349 Cell=C2=A0
BSchirano@yahoo.com
From: Peter Vucinic <pvucinic@netspace.net.au>
To: 'marty' <trmarty@hotmail.com>; 'FOT' <fot@autox.team.net>=20
Sent: Tuesday, July 12, 2016 9:54 AM
Subject: Re: [Fot] Oil Pressure Conundrum
=20
#yiv0474239424 #yiv0474239424 -- _filtered #yiv0474239424 {panose-1:2 4 5 3=
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v0474239424 Marty,Sounds like some of the bearings clearances are larger th=
an they should be and you are losing oil pressure as the oil warms up and s=
tarts leaking through the journal(s) faster once you are at operating temps=
. If you are running an aggressive cam profile and/or high valve spring rat=
es? This will adversely affect cam bearing wear for sure. =C2=A0 =C2=A0"You=
can Make a Small Fortune From Motor Racing. As long as You Started With A =
Lage Fortune!"Kind RegardsPeter VucinicTR4 - TR7 V8 - Spitfire MkII________=
_______________________________________fot@autox.team.net =C2=A0http://www.=
fot-racing.com =C2=A0Donate: http://www.team.net/donate.htmlArchive: http:/=
/www.team.net/archiveForums: http://www.team.net/forums =C2=A0 =C2=A0 =C2=
=A0 =C2=A0From: Fot [mailto:fot-bounces@autox.team.net] On Behalf Of marty
Sent: Tuesday, 12 July 2016 4:09 AM
To: FOT
Subject: [Fot] Oil Pressure Conundrum =C2=A0=C2=A0 I could use some opinion=
s. Some history. Spitfire small journal 1296 engine, rebuilt 6 race weekend=
s ago included all new bearings. I tore it down this spring to check it ove=
r 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 hav=
e the actual numbers in front of me at the present. Cam bearings appeared t=
o have some slight visual wear at the bottoms but I did not actually measur=
e them. I run Brad Pen 20W50. Oil temps run 210 and water temps run 190. EG=
T 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 do=
wn to 35psi. If I add enough springs to the pressure relief valve I see ove=
r 125 psi cold so I am thinking my pump is putting out enough pressure. I t=
ried shimming to get 50/60 cold at idle and it drops to 35 at operating tem=
ps at 7000 rpm. I tried a new pressure gage over the weekend and the number=
s 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.=C2=A0 I believe this =
situation actually started a season ago because I added a washer to the pre=
ssure relief valve last season.=C2=A0 I=E2=80=99m thinking it most likely i=
s cam bearing wear even though all the bearings were fresh 6 events ago. An=
y guidance? One thing I did learn this weekend is my accusump pressure gage=
is incorrect.=C2=A0 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 r=
eplaced my electric dash gage with a mechanical gage=C2=A0and its reading m=
atched the gage I just disconnected. Oil pressure readings are taken at the=
port below the distributer. =C2=A0Side note. Car ran awesome. I ran a 2.22=
at PittRace Sunday and that was 6 seconds faster than my previous best lap=
there. =C2=A0Thanks,Marty=20
_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://www.team.net/archive
oo.com
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<html><head></head><body><div style=3D"color:#000; background-color:#fff; f=
ont-family:times new roman, new york, times, serif;font-size:16px"><div dir=
=3D"ltr" id=3D"yui_3_16_0_1_1468327401121_163568"><span id=3D"yui_3_16_0_1_=
1468327401121_163255">Marty, I think Peter is right. The GT motor I am abou=
t to rebuild had similar symptoms. Great pressure cold, 75-80, then droppin=
g 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 showi=
ng some copper, and others indicating wear also, all on the compression str=
oke side (opposite side of oil journal). Mains were all OK. I run street Mo=
bil One 15-50, but think I will change after rebuild.</span></div><div id=
=3D"yui_3_16_0_1_1468327401121_163838" dir=3D"ltr"><span id=3D"yui_3_16_0_1=
_1468327401121_163255"><br></span></div><div dir=3D"ltr"><span id=3D"yui_3_=
16_0_1_1468327401121_163255">Would welcome a few race oil opinions from FOT=
</span></div><div id=3D"yui_3_16_0_1_1468327401121_163248" class=3D"signatu=
re"><div id=3D"yui_3_16_0_1_1468327401121_163249"><div id=3D"yui_3_16_0_1_1=
468327401121_163374"><br></div><div id=3D"yui_3_16_0_1_1468327401121_163739=
">Best</div><div id=3D"yui_3_16_0_1_1468327401121_163760">Brian<br></div><d=
iv id=3D"yui_3_16_0_1_1468327401121_163376"><br></div><div id=3D"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=3D"yui_3_16_0_1_146=
8327401121_163346" class=3D"qtdSeparateBR"><br><br></div><div style=3D"disp=
lay: block;" id=3D"yui_3_16_0_1_1468327401121_163352" class=3D"yahoo_quoted=
"> <div id=3D"yui_3_16_0_1_1468327401121_163351" style=3D"font-family: tim=
es new roman, new york, times, serif; font-size: 16px;"> <div id=3D"yui_3_1=
6_0_1_1468327401121_163350" style=3D"font-family: HelveticaNeue, Helvetica =
Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div =
id=3D"yui_3_16_0_1_1468327401121_163349" dir=3D"ltr"> <font id=3D"yui_3_16_=
0_1_1468327401121_163348" face=3D"Arial" size=3D"2"> <hr id=3D"yui_3_16_0_1=
_1468327401121_163347" size=3D"1"> <b><span style=3D"font-weight:bold;">Fro=
m:</span></b> Peter Vucinic <pvucinic@netspace.net.au><br> <b><span s=
tyle=3D"font-weight: bold;">To:</span></b> 'marty' <trmarty@hotmail.com&=
gt;; 'FOT' <fot@autox.team.net> <br> <b><span style=3D"font-weight: b=
old;">Sent:</span></b> Tuesday, July 12, 2016 9:54 AM<br> <b><span style=3D=
"font-weight: bold;">Subject:</span></b> Re: [Fot] Oil Pressure Conundrum<b=
r> </font> </div> <div class=3D"y_msg_container"><br><div id=3D"yiv04742394=
24"><style>#yiv0474239424 #yiv0474239424 --
=20
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=09{}
#yiv0474239424 </style><div><div class=3D"yiv0474239424WordSection1"><div c=
lass=3D"yiv0474239424MsoNormal"><span style=3D"font-size:11.0pt;">Marty,</s=
pan></div><div class=3D"yiv0474239424MsoNormal"><span style=3D"font-size:11=
.0pt;">Sounds like some of the bearings clearances are larger than they sho=
uld be and you are losing oil pressure as the oil warms up and starts leaki=
ng through the journal(s) faster once you are at operating temps. </span></=
div><div class=3D"yiv0474239424MsoNormal"><span style=3D"font-size:11.0pt;"=
>If you are running an aggressive cam profile and/or high valve spring rate=
s? This will adversely affect cam bearing wear for sure.</span></div><div c=
lass=3D"yiv0474239424MsoNormal"><span style=3D"font-size:11.0pt;"> </=
span></div><div class=3D"yiv0474239424MsoNormal"><span style=3D"font-size:1=
1.0pt;"> </span></div><div class=3D"yiv0474239424MsoNormal"><b><span =
style=3D"font-size:11.0pt;">"You can Make a Small Fortune From Motor Racing=
. As long as You Started With A Lage Fortune!"</span></b></div><div class=
=3D"yiv0474239424MsoNormal"><span style=3D"font-size:11.0pt;">Kind Regards<=
/span></div><div class=3D"yiv0474239424MsoNormal"><span style=3D"font-size:=
11.0pt;">Peter Vucinic</span></div><div class=3D"yiv0474239424MsoNormal"><s=
pan style=3D"font-size:11.0pt;">TR4 - TR7 V8 - Spitfire MkII</span></div><d=
iv class=3D"yiv0474239424MsoNormal"><span style=3D"font-size:11.0pt;">_____=
__________________________________________</span></div><div class=3D"yiv047=
4239424MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas;colo=
r:#1F497D;"><a rel=3D"nofollow" shape=3D"rect" ymailto=3D"mailto:fot@autox.=
team.net" target=3D"_blank" href=3D"mailto:fot@autox.team.net";><span style=
=3D"color:blue;">fot@autox.team.net</span></a></span></div><div class=3D"yi=
v0474239424MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas;=
color:#1F497D;"> </span></div><div class=3D"yiv0474239424MsoNormal"><=
span style=3D"font-size:10.5pt;font-family:Consolas;color:#1F497D;"><a rel=
=3D"nofollow" shape=3D"rect" target=3D"_blank" href=3D"http://www.fot-racin=
g.com/"><span style=3D"color:blue;">http://www.fot-racing.com</span></a></s=
pan></div><div class=3D"yiv0474239424MsoNormal"><span style=3D"font-size:10=
.5pt;font-family:Consolas;color:#1F497D;"> </span></div><div class=3D=
"yiv0474239424MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consol=
as;color:#1F497D;">Donate: <a rel=3D"nofollow" shape=3D"rect" target=3D"_bl=
ank" href=3D"http://www.team.net/donate.html";><span style=3D"color:blue;">h=
ttp://www.team.net/donate.html</span></a></span></div><div class=3D"yiv0474=
239424MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas;color=
:#1F497D;">Archive: <a rel=3D"nofollow" shape=3D"rect" target=3D"_blank" hr=
ef=3D"http://www.team.net/archive";><span style=3D"color:blue;">http://www.t=
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"><span style=3D"font-size:10.5pt;font-family:Consolas;color:#1F497D;">Foru=
ms: <a rel=3D"nofollow" shape=3D"rect" target=3D"_blank" href=3D"http://www=
.team.net/forums"><span style=3D"color:blue;">http://www.team.net/forums</s=
pan></a></span></div><div class=3D"yiv0474239424MsoNormal"><span style=3D"f=
ont-size:11.0pt;"> </span></div><div class=3D"yiv0474239424MsoNormal"=
><span style=3D"font-size:11.0pt;"> </span></div><div class=3D"yiv047=
4239424MsoNormal"><span style=3D"font-size:11.0pt;"> </span></div><di=
v class=3D"yiv0474239424MsoNormal"><span style=3D"font-size:11.0pt;">  =
;</span></div><div class=3D"yiv0474239424yqt6998646359" id=3D"yiv0474239424=
yqt20896"><div><div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;pad=
ding:3.0pt 0cm 0cm 0cm;"><div class=3D"yiv0474239424MsoNormal" style=3D"mar=
gin-left:36.0pt;"><b><span style=3D"font-size:10.0pt;">From:</span></b><spa=
n style=3D"font-size:10.0pt;"> Fot [mailto:fot-bounces@autox.team.net] <b>O=
n Behalf Of </b>marty<br clear=3D"none"><b>Sent:</b> Tuesday, 12 July 2016 =
4:09 AM<br clear=3D"none"><b>To:</b> FOT<br clear=3D"none"><b>Subject:</b> =
[Fot] Oil Pressure Conundrum</span></div></div></div><div class=3D"yiv04742=
39424MsoNormal" style=3D"margin-left:36.0pt;"> </div><div><div class=
=3D"yiv0474239424MsoNormal" style=3D"margin-left:36.0pt;"><span style=3D"">=
</span> <span style=3D""></span></div><div class=3D"yiv0474239424MsoN=
ormal" style=3D"margin-right:0cm;margin-bottom:8.0pt;margin-left:36.0pt;">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 en=
d 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 o=
il pressure at running temps all weekend. Once my oil temps come up on trac=
k 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 o=
ut 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 auxiliar=
y oil line to the head, I removed it at one point over the weekend and it h=
ad 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 ad=
ded a washer to the pressure relief valve last season. I=E2=80=99m th=
inking 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 hig=
her that my dash gage. I was thinking it was probably correct and my dash g=
age was wrong until I replaced my electric dash gage with a mechanical gage=
and its reading matched the gage I just disconnected. Oil pressure re=
adings are taken at the port below the distributer. </div><div class=3D"yiv=
0474239424MsoNormal" style=3D"margin-right:0cm;margin-bottom:8.0pt;margin-l=
eft:36.0pt;"> </div><div class=3D"yiv0474239424MsoNormal" style=3D"mar=
gin-right:0cm;margin-bottom:8.0pt;margin-left:36.0pt;">Side note. Car ran a=
wesome. I ran a 2.22 at PittRace Sunday and that was 6 seconds faster than =
my previous best lap there. </div><div class=3D"yiv0474239424MsoNormal" sty=
le=3D"margin-right:0cm;margin-bottom:8.0pt;margin-left:36.0pt;"> </div=
><div class=3D"yiv0474239424MsoNormal" style=3D"margin-right:0cm;margin-bot=
tom:8.0pt;margin-left:36.0pt;">Thanks,</div><div class=3D"yiv0474239424MsoN=
ormal" style=3D"margin-right:0cm;margin-bottom:8.0pt;margin-left:36.0pt;">M=
arty </div></div></div></div></div></div><br><div class=3D"yqt6998646359" i=
d=3D"yqt08447">_______________________________________________<br clear=3D"=
none"><a shape=3D"rect" ymailto=3D"mailto:fot@autox.team.net"; href=3D"mailt=
o:fot@autox.team.net">fot@autox.team.net</a><br clear=3D"none"><br clear=3D=
"none"><a shape=3D"rect" href=3D"http://www.fot-racing.com/"; target=3D"_bla=
nk">http://www.fot-racing.com</a><br clear=3D"none"><br clear=3D"none">Dona=
te: <a shape=3D"rect" href=3D"http://www.team.net/donate.html"; target=3D"_b=
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ww.team.net/archive</a><br clear=3D"none">Forums: <a shape=3D"rect" href=3D=
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a><br clear=3D"none">Unsubscribe/Manage: <a shape=3D"rect" href=3D"http://a=
utox.team.net/mailman/options/fot/bschirano@yahoo.com" target=3D"_blank">ht=
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_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://www.team.net/archive
--===============1371587695900356139==--
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