<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Correct: The purpose of the oil is to retard the rise of the piston. Why do that? If you can watch the fuel flow out of the orifice, you’ll see that slowing the piston rise gives a temporary enrichment, similar to the accelerator pump in a fixed- Venturi carburetor. <div>This is needed because opening the throttle raises the pressure in the manifold ( remember it is running as a vacuum) and so raising the pressure makes the fuel condense onto the walls of the manifold ( like rain!) and so you temporarily need more of it in the air stream to compensate.<br><div>Unlike street engines, race engines are tuned extra-rich to begin with, so they are less sensitive to this phenomenon. You can get away with no oil in the carbs sometimes. </div><div>I run 10 W (when I can get it) or cheap ATF. Why? I find the engine is more responsive under part throttle conditions such as when I am feathering the throttle in controlled oversteer conditions (I run a welded diff so the throttle is part of my steering mechanism.)</div><div>Try it both ways and see how it works in your car at the altitude you run. It’s more about driveability than absolute power.</div><div>Phil Gott</div><div><br><div><br><div dir="ltr">Sent from my iPhone</div><div dir="ltr"><br><blockquote type="cite">On Nov 24, 2020, at 3:20 AM, Rocky Entriken via Fot <fot@autox.team.net> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr">
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<div>Re Oil:</div>
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<div style="FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: "Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; DISPLAY: inline">I
once did a race at Woody Creek Raceway, Aspen, CO (8000 feet) and could not get
the car to rev over 5000 rpm. A friend diagnosed the problem ... got out his
wire cutters and snipped the posts off the rods in the SU caps. Never had a
problem again! </div></div>
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<div style="FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: "Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; DISPLAY: inline">He
about gave me a heart attack when he did it. Thing is, the purpose of the oil in
the SUs is to retard the piston going up and down, mostly up. It was explained
to me, you don’t WANT to retard the carb piston on a race engine. You hit the
gas you want it WOT. RIGHT NOW! Street car, sure. Race car, no. </div></div>
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<div style="FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: "Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; DISPLAY: inline">But
a tip: Clean the inside of the carb, piston & cylinder, regularly. Before
each race. Brakleen. Fuel residue will gum it up if you don’t. </div></div>
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<div style="FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: "Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; DISPLAY: inline">--Rocky</div></div>
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<div style="font-color: black"><b>From:</b> <a title="fot@autox.team.net">Henry
Giffin via Fot</a> </div>
<div><b>Sent:</b> Tuesday, November 24, 2020 12:58 AM</div>
<div><b>To:</b> <a title="fot@autox.team.net">fot@autox.team.net</a> ; <a title="fot-bounces@autox.team.net">fot-bounces@autox.team.net</a> </div>
<div><b>Subject:</b> [Fot] SU oil/refurbishing race suit?</div></div></div>
<div> </div></div>
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<p class="MsoNormal"><span style="FONT-SIZE: 14pt">FOTs, I have two questions for
the knowledgeable ones.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="FONT-SIZE: 14pt"> Do you use
light oil in your SUs on your racing engines? I have heard both sides of
this. I have not been using any oil, but have heard from friends I should
be. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="FONT-SIZE: 14pt"> A
number of years ago when my son-in-law started racing we sent my old racing suit
to someone to be refurbished. It came back in great condition. My
current suit could use some work. We lost the name of the company who did
the work. Can anyone recommend a source for refurbishing my
suit?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="FONT-SIZE: 14pt">
Thanks, Hank<o:p></o:p></span></p>
<p class="MsoNormal"><span style="FONT-SIZE: 14pt"><o:p></o:p></span> </p>
<p class="MsoNormal">Hank Giffin<o:p></o:p></p>
<p class="MsoNormal">757-375-1491<o:p></o:p></p>
<p class="MsoNormal"><o:p></o:p> </p></div>
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</p><hr>
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