Subject: Re: [Fot] Race Engine Refreshing Frequency - compression results

From: Tony Garmey via Fot <[email-masked]>
Date: Sat, 28 Oct 2023 21:13:35 +0000

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_______________________________________________
[email-masked]

http://www.fot-racing.com

Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot

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From: Ken Knight via Fot <[email-masked]>
Date: Sat, 28 Oct 2023 16:06:23 -0700

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If you can barrow a leak down tester that is still the best tool to assess =
engine health.  I also change oil filters after each race and cut it open t=
o see what is trapped inside.   A well built TR race motor can easily do do=
uble those hours on the bottom end.  In my opinion the key to long tern mot=
or health, assuming a good build, is a high quality race oil.  My choice is=
 Joe Gibbs Driven XP-3 10-30, I have bearings that look almost new at 50 hr=
s. using this oil.  No such thing as =E2=80=9Ccheap=E2=80=9D racing oil.  =
=E2=80=9CNever be beaten by parts=E2=80=9D K. Kastner.

Ken

Sent from Mail for Windows

From: James Trudeau via Fot
Sent: Saturday, October 28, 2023 2:06 PM
To: [email-masked]
Subject: [Fot] Race Engine Refreshing Frequency - compression results

I finished a 9 weekend race/school/track day season that started in April a=
nd finished at Thompson in October with no obvious performance problems. To=
tal of 38 engine hours including warmup, grid, race, cool down.=C2=A0

Did a dry compression test today:
1. 210
2. 225
3. 195
4. 200

I get some oil blow by at the valve cover cap and maybe some drips from low=
er end seals (not sure if oil starts at valve cover).=C2=A0

I=E2=80=99m sure I=E2=80=99ll hear a suggestion to do a leak down test and =
/ or wet compression.=C2=A0

Oil filter forensics?

In the absence of obvious issues, how much of a tear down is warranted?=C2=
=A0

Jim
Sent from my iPhone

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--></style></head><body lang=3DEN-US link=3Dblue vlink=3D"#954F72" style=3D=
'word-wrap:break-word'><div class=3DWordSection1><p class=3DMsoNormal>If yo=
u can barrow a leak down tester that is still the best tool to assess engin=
e health.=C2=A0 I also change oil filters after each race and cut it open t=
o see what is trapped inside.=C2=A0 =C2=A0A well built TR race motor can ea=
sily do double those hours on the bottom end.=C2=A0 In my opinion the key t=
o long tern motor health, assuming a good build, is a high quality race oil=
.=C2=A0 My choice is Joe Gibbs Driven XP-3 10-30, I have bearings that look=
 almost new at 50 hrs. using this oil.=C2=A0 No such thing as =E2=80=9Cchea=
p=E2=80=9D racing oil.=C2=A0 =E2=80=9CNever be beaten by parts=E2=80=9D K. =
Kastner.</p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>=
Ken</p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal><o:p>=
&nbsp;</o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNor=
mal>Sent from <a href=3D"https://go.microsoft.com/fwlink/?LinkId=3D550986">=
Mail</a> for Windows</p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><div styl=
e=3D'mso-element:para-border-div;border:none;border-top:solid #E1E1E1 1.0pt=
;padding:3.0pt 0in 0in 0in'><p class=3DMsoNormal style=3D'border:none;paddi=
ng:0in'><b>From: </b><a href=3D"mailto:[email-masked]">James Trudeau vi=
a Fot</a><br><b>Sent: </b>Saturday, October 28, 2023 2:06 PM<br><b>To: </b>=
<a href=3D"mailto:[email-masked]">[email-masked]</a><br><b>Subject:=
 </b>[Fot] Race Engine Refreshing Frequency - compression results</p></div>=
<p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal>I finished a=
 9 weekend race/school/track day season that started in April and finished =
at Thompson in October with no obvious performance problems. Total of 38 en=
gine hours including warmup, grid, race, cool down.&nbsp;<o:p></o:p></p><di=
v><p class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p class=3DMsoNormal=
>Did a dry compression test today:<o:p></o:p></p></div><div><ol style=3D'ma=
rgin-top:0in;-webkit-text-size-adjust: auto' start=3D1 type=3D1><li class=
=3Dli1 style=3D'margin-top:0in;margin-bottom:0in;mso-list:l0 level1 lfo1;fo=
nt-stretch: normal'><span class=3Ds1>210</span><o:p></o:p></li><li class=3D=
li1 style=3D'margin-top:0in;margin-bottom:0in;mso-list:l0 level1 lfo1;font-=
stretch: normal'><span class=3Ds1>225</span><o:p></o:p></li><li class=3Dli1=
 style=3D'margin-top:0in;margin-bottom:0in;mso-list:l0 level1 lfo1;font-str=
etch: normal'><span class=3Ds1>195</span><o:p></o:p></li><li class=3Dli1 st=
yle=3D'margin-top:0in;margin-bottom:0in;mso-list:l0 level1 lfo1;font-stretc=
h: normal'><span class=3Ds1>200</span><o:p></o:p></li></ol><div><p class=3D=
MsoNormal><o:p>&nbsp;</o:p></p></div><div><p class=3DMsoNormal>I get some o=
il blow by at the valve cover cap and maybe some drips from lower end seals=
 (not sure if oil starts at valve cover).&nbsp;<o:p></o:p></p></div><div><p=
 class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p class=3DMsoNormal>I=
=E2=80=99m sure I=E2=80=99ll hear a suggestion to do a leak down test and /=
 or wet compression.&nbsp;<o:p></o:p></p></div><div><p class=3DMsoNormal><o=
:p>&nbsp;</o:p></p></div><div><p class=3DMsoNormal>Oil filter forensics?<o:=
p></o:p></p></div><div><p class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div=
><p class=3DMsoNormal>In the absence of obvious issues, how much of a tear =
down is warranted?&nbsp;<o:p></o:p></p></div><div><p class=3DMsoNormal><o:p=
>&nbsp;</o:p></p></div><div><p class=3DMsoNormal style=3D'margin-bottom:12.=
0pt'>Jim<o:p></o:p></p></div></div><p class=3DMsoNormal>Sent from my iPhone=
<o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p></div></body></htm=
l>=

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From: fubog1 via Fot <[email-masked]>
Date: Sun, 29 Oct 2023 14:32:49 +0000 (UTC)

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 Every engine will have a different service life, depending on state of dev=
elopment, tune, rpm range, general maintenance, etc.A competitive full-tilt=
 National spec engine will likely get a freshen-up every weekend, a mild-tu=
ne/low rev Vintage engine can last seasons w/regular maintenance.Leakdown, =
oil filter inspection, valve lash check, oil pressure & temp readings, & pl=
ug check will give an idea of the engines health.Next step is a bearing che=
ck; anything beyond that involves full teardown & hands-on inspection.Also =
set valve lash prior to compression test, & realize that the compression te=
st is of limited value; a leaking cylinder can still pump up pretty good...=
HTH
Glen Efinger
.

    On Saturday, October 28, 2023 at 05:02:44 PM EDT, James Trudeau via Fot=
 <[email-masked]> wrote: =20
=20
 I finished a 9 weekend race/school/track day season that started in April =
and finished at Thompson in October with no obvious performance problems. T=
otal of 38 engine hours including warmup, grid, race, cool down.=C2=A0
Did a dry compression test today:  =20
   - 210
   - 225
   - 195
   - 200

Sent from my iPhone_______________________________________________
[email-masked]

m

 =20
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<html><head></head><body><div class=3D"ydp38579740yahoo-style-wrap" style=
=3D"font-family:Arial, Helvetica, sans-serif;font-size:16px;"><div></div>
        <div dir=3D"ltr" data-setdir=3D"false">Every engine will have a dif=
ferent service life, depending on state of development, tune, rpm range, ge=
neral maintenance, etc.</div><div dir=3D"ltr" data-setdir=3D"false">A compe=
titive full-tilt National spec engine will likely get a freshen-up every we=
ekend, a mild-tune/low rev Vintage engine can last seasons w/regular mainte=
nance.</div><div dir=3D"ltr" data-setdir=3D"false">Leakdown, oil filter ins=
pection, valve lash check, oil pressure &amp; temp readings, &amp; plug che=
ck will give an idea of the engines health.</div><div dir=3D"ltr" data-setd=
ir=3D"false">Next step is a bearing check; anything beyond that involves fu=
ll teardown &amp; hands-on inspection.</div><div dir=3D"ltr" data-setdir=3D=
"false">Also set valve lash prior to compression test, &amp; realize that t=
he compression test is of limited value; a leaking cylinder can still pump =
up pretty good...</div><div dir=3D"ltr" data-setdir=3D"false">HTH</div><div=
 dir=3D"ltr" data-setdir=3D"false"><br></div><div dir=3D"ltr" data-setdir=
=3D"false">Glen Efinger<br></div><div dir=3D"ltr" data-setdir=3D"false">.<b=
r></div><div><br></div>
       =20
        </div><div id=3D"ydp1782500ayahoo_quoted_8817326337" class=3D"ydp17=
82500ayahoo_quoted">
            <div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, s=
ans-serif;font-size:13px;color:#26282a;">
               =20
                <div>
                    On Saturday, October 28, 2023 at 05:02:44 PM EDT, James=
 Trudeau via Fot &lt;[email-masked]&gt; wrote:
                </div>
                <div><br></div>
                <div><br></div>
                <div><div id=3D"ydp1782500ayiv2186919804"><div>I finished a=
 9 weekend race/school/track day season that started in April and finished =
at Thompson in October with no obvious performance problems. Total of 38 en=
gine hours including warmup, grid, race, cool down.&nbsp;<div><br></div><di=
v>Did a dry compression test today:</div><div><ol class=3D"ydp1782500ayiv21=
86919804ol1"><li style=3D"margin:0px;font-stretch:normal;line-height:normal=
;" class=3D"ydp1782500ayiv2186919804li1"><span class=3D"ydp1782500ayiv21869=
19804s1">210</span></li><li style=3D"margin:0px;font-stretch:normal;line-he=
ight:normal;" class=3D"ydp1782500ayiv2186919804li1"><span class=3D"ydp17825=
00ayiv2186919804s1">225</span></li><li style=3D"margin:0px;font-stretch:nor=
mal;line-height:normal;" class=3D"ydp1782500ayiv2186919804li1"><span class=
=3D"ydp1782500ayiv2186919804s1">195</span></li><li style=3D"margin:0px;font=
-stretch:normal;line-height:normal;" class=3D"ydp1782500ayiv2186919804li1">=
<span class=3D"ydp1782500ayiv2186919804s1">200</span></li></ol><div><br></d=
iv><div>I get some oil blow by at the valve cover cap and maybe some drips =
from lower end seals (not sure if oil starts at valve cover).&nbsp;</div><d=
iv><br></div><div>I=E2=80=99m sure I=E2=80=99ll hear a suggestion to do a l=
eak down test and / or wet compression.&nbsp;</div><div><br></div><div>Oil =
filter forensics?</div><div><br></div><div>In the absence of obvious issues=
, how much of a tear down is warranted?&nbsp;</div><div><br></div><div>Jim<=
br><br><div dir=3D"ltr">Sent from my iPhone</div></div></div></div></div>__=
_____________________________________________<br><a href=3D"mailto:fot@auto=
x.team.net" rel=3D"nofollow" target=3D"_blank">[email-masked]</a><br><b=
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