<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content="text/html; charset=UTF-8" http-equiv=Content-Type>
<META name=GENERATOR content="MSHTML 11.00.9600.18666"></HEAD>
<BODY id=role_body style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; COLOR: #000000"
bottomMargin=7 leftMargin=7 rightMargin=7 topMargin=7><FONT id=role_document
color=#000000 size=2 face=Arial>
<DIV>Interesting.</DIV>
<DIV> </DIV>
<DIV>Main bearing wear is greatest on start up as no hydrodynamic oil film has
been established, and to a lesser extend on the other rod bearings. I'm
not sure about piston ring and bore wear but guess that's were the 90% wear
takes place until the engine is warmed up because everything is tighter?</DIV>
<DIV> </DIV>
<DIV>At race mechanics school they might teach that 90% of ring and
bore wear occurs when driving through a gravel trap or someone else's
gravel trap excursion generated dust without an air filter. Or maybe they
don't teach that!</DIV>
<DIV> </DIV>
<DIV>Other info that I need, is to convert F to C so:</DIV>
<DIV> </DIV>
<DIV>190F = 88C Oil temp</DIV>
<DIV> </DIV>
<DIV>175-205F = 79-96C Coolant temp - </DIV>
<DIV> </DIV>
<DIV>The thing with temp readings is that they vary with where you take them
from. The water (actually water + antifreeze) temp in the Pierce head on
my car is way hotter than the water temp reading I see in the rad.</DIV>
<DIV> </DIV>
<DIV>The other thing is how much the power figure varies with air temp - I'm
guessing the richer the mixture (up to full race strength's) the less the power
drop is with warmer air. I'd like an air temp sensor in the engine
bay.</DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 13/06/2017 21:14:19 GMT Daylight Time,
billyzoom@billyzoom.com writes:</DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><FONT
style="BACKGROUND-COLOR: transparent" color=#000000 size=2 face=Arial>
<BLOCKQUOTE type="cite"><SPAN
style="FONT-SIZE: small; FONT-FAMILY: Arial">For power or for
economy?</SPAN></BLOCKQUOTE><BR>
<DIV>How about for longevity? In mechanic’s school, we were always taught that
90% of engine wear occurred during warmup, and that the thermostat was there
to reduce warmup time. They also taught us that running hotter wasn’t a
problem as long as the coolant didn’t boil. Were our textbooks
incorrect?</DIV></FONT></BLOCKQUOTE></DIV></FONT></BODY></HTML>