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The break-in procedures for air-cooled motorcycles is very similar to that for
(air-cooled) aircraft piston engines. Because the clearances are greater in
air-cooled engines--to allow for greater and varying metals expansion
rates--the emphasis is on bedding-in the rings (although these engines also
have flat-tapped, OHV valve trains). That should be somewhat less of a
concern--but still a concern--in our water cooled engines, where cam/tappet
break-in appears to be critical.
A point not mentioned in the motorcycle procedure is that breaking in an engine
at high altitude might be problematic, since you won't get the same BMEP at,
say, 5,000 feet that you would at sea level (non-turboed and non-supercharged
engines, of course). For an aircraft engine you are advised to run at 1) low
altitude, 2) full power (WOT or close to it) and 3) full rich for the first few
hours (up to 50). The rich mixture is to used to wash oil off the cylinder
walls to promote break-in and prevent oil glazing (I've heard of desperate
airplane owners--who may have spent $50K or more on an engine rebuild--dumping
Bon Ami into cylinders in the hope it will break the glaze). Since an SU carb's
mixture can be set across the RPM range it might be a good idea to run them
extra rich for the first 500 miles or so.
Bob
I always drove gently for first 100 miles changing rpms and speed, changed oil,
then continued to drive and change oil again at 500 miles. Varying speed and
RPM. Not sure why we did this, something about seating the piston rings.
Clearly many ways to run in a new engine
Ira Erbs
Portland,OR
_______ _______
(______ \____1959 BN4____/ _______)
(_________________________)
BT7 engine and disk brakes
Please excuse random auto corrects and misspelled words
On Sun, Aug 28, 2016 at 10:11 PM, Michael MacLean < rrengineer.mike@att.net >
wrote:
A friend who recently past away in January that had been rebuilding Healey
motors for over forty years told me he just gets them started and idles them
for a while and then runs them gently for a 100 miles or so, changes the oil
and then it's your choice how careful of a break in you want to do. He said he
never had a problem with them or the cams during break in. Go figure. I also
have an article that says as soon as you get the motor started, run it at high
rpm to seat the rings properly. They are talking about a motorcycle, so I am
not sure if applies in our case, but an interesting read.
New Engine Break-in Procedure
New Engine Break-in Procedure
When a cylinder is new or overhauled the surface of it's walls are honed with
abrasive stones to produce a rough surface that will help wear the piston rings
...
View on www.ntnoa.org
Preview by Yahoo
Mike MacLean
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<html><body><div style=3D"font-family: Arial; font-size: 12pt; color: #0000=
00"><div aria-label=3D"Compose body">The break-in procedures for air-cooled=
motorcycles is very similar to that for (air-cooled) aircraft piston engin=
es. Because the clearances are greater in air-cooled engines--to allo=
w for greater and varying metals expansion rates--the emphasis is on beddin=
g-in the rings (although these engines also have flat-tapped, OHV valve tra=
ins). That should be somewhat less of a concern--but still a concern-=
-in our water cooled engines, where cam/tappet break-in appears to be criti=
cal. </div><div aria-label=3D"Compose body"><br></div><div aria-label=
=3D"Compose body">A point not mentioned in the motorcycle procedure is that=
breaking in an engine at high altitude might be problematic, since you won=
't get the same BMEP at, say, 5,000 feet that you would at sea level (non-t=
urboed and non-supercharged engines, of course). For an aircraft engi=
ne you are advised to run at 1) low altitude, 2) full power (WOT or close t=
o it) and 3) full rich for the first few hours (up to 50). The rich m=
ixture is to used to wash oil off the cylinder walls to promote break-in an=
d prevent oil glazing (I've heard of desperate airplane owners--who may hav=
e spent $50K or more on an engine rebuild--dumping Bon Ami into cylinders i=
n the hope it will break the glaze). Since an SU carb's mixture can b=
e set across the RPM range it might be a good idea to run them extra rich f=
or the first 500 miles or so.</div><div aria-label=3D"Compose body"><br></d=
iv><div aria-label=3D"Compose body">Bob</div><div><br></div><div style=3D"c=
olor:#000;font-weight:normal;font-style:normal;text-decoration:none;font-fa=
mily:Helvetica,Arial,sans-serif;font-size:12pt;" data-mce-style=3D"color: #=
000; font-weight: normal; font-style: normal; text-decoration: none; font-f=
amily: Helvetica,Arial,sans-serif; font-size: 12pt;"><br><div><br></div><di=
v dir=3D"ltr">I always drove gently for first 100 miles changing rpms and s=
peed, changed oil, then continued to drive and change oil again at 500 mile=
s. Varying speed and RPM. Not sure why we did this, something about seating=
the piston rings. <div>Clearly many ways to run in a new engine=
</div></div><div class=3D"gmail_extra"><br clear=3D"all"><div><div class=3D=
"gmail_signature"><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"l=
tr"><div dir=3D"ltr">Ira Erbs<div>Portland,OR</div><div><span style=3D"font=
-family:'Times New Roman',serif" data-mce-style=3D"font-family: 'Times New =
Roman',serif;"> _______ &nb=
sp; &=
nbsp; _______</span><br style=3D"font-family:'Times New Roman',serif"=
data-mce-style=3D"font-family: 'Times New Roman',serif;"><span style=3D"fo=
nt-family:'Times New Roman',serif" data-mce-style=3D"font-family: 'Times Ne=
w Roman',serif;"> (______ \____1959 BN4____/ _______)</s=
pan><br style=3D"font-family:'Times New Roman',serif" data-mce-style=3D"fon=
t-family: 'Times New Roman',serif;"><span style=3D"font-family:'Times New R=
oman',serif" data-mce-style=3D"font-family: 'Times New Roman',serif;"> =
; (_________________________)</span></div><div>&=
nbsp; BT7 engine and disk brakes</div><div><br>=
</div><div>Please excuse random auto corrects and misspelled words</div></d=
iv></div></div></div></div></div></div></div><br><div class=3D"gmail_quote"=
>On Sun, Aug 28, 2016 at 10:11 PM, Michael MacLean <span dir=3D"ltr"><<a=
href=3D"mailto:rrengineer.mike@att.net" target=3D"_blank" data-mce-href=3D=
"mailto:rrengineer.mike@att.net">rrengineer.mike@att.net</a>></span> wro=
te:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-=
left:1px #ccc solid;padding-left:1ex" data-mce-style=3D"margin: 0 0 0 .8ex;=
border-left: 1px #ccc solid; padding-left: 1ex;"><div><div style=3D"color:=
#000;background-color:#fff;font-family:times new roman,new york,times,serif=
;font-size:16px" data-mce-style=3D"color: #000; background-color: #fff; fon=
t-family: times new roman,new york,times,serif; font-size: 16px;"><div>&nbs=
p;A friend who recently past away in January that had been rebuilding Heale=
y motors for over forty years told me he just gets them started and idles t=
hem for a while and then runs them gently for a 100 miles or so, changes th=
e oil and then it's your choice how careful of a break in you want to do.&n=
bsp; He said he never had a problem with them or the cams during break in.&=
nbsp; Go figure. I also have an article that says as soon as you get =
the motor started, run it at high rpm to seat the rings properly. The=
y are talking about a motorcycle, so I am not sure if applies in our case, =
but an interesting read.</div><div dir=3D"ltr"><a href=3D"http://www.ntnoa.=
org/enginebreakin.htm" target=3D"_blank" data-mce-href=3D"http://www.ntnoa.=
org/enginebreakin.htm">New Engine Break-in Procedure</a><br></div><div styl=
e=3D"width:450px;font-family:'Georgia','Times','Times New Roman','serif';ma=
rgin-top:5px;margin-bottom:5px;background-color:#ffffff" data-mce-style=3D"=
width: 450px; font-family: 'Georgia','Times','Times New Roman','serif'; mar=
gin-top: 5px; margin-bottom: 5px; background-color: #ffffff;"><table style=
=3D"width:450px;height:170px;display:block" border=3D"0" cellpadding=3D"0" =
cellspacing=3D"0" data-mce-style=3D"width: 450px; height: 170px; display: b=
lock;" class=3D"mceItemTable"><tbody><tr><td colspan=3D"8" style=3D"height:=
1px;background-color:#e5e5e5;font-size:1px;border-collapse:collapse" data-m=
ce-style=3D"height: 1px; background-color: #e5e5e5; font-size: 1px; border-=
collapse: collapse;"><div style=3D"min-height:1px;background-color:#e5e5e5;=
font-size:1px;line-height:0px" data-mce-style=3D"min-height: 1px; backgroun=
d-color: #e5e5e5; font-size: 1px; line-height: 0px;"> </div></td></tr>=
<tr><td rowspan=3D"5" style=3D"width:1px;background-color:#e5e5e5;font-size=
:1pt;border-collapse:collapse" data-mce-style=3D"width: 1px; background-col=
or: #e5e5e5; font-size: 1pt; border-collapse: collapse;"><div style=3D"widt=
h:1px;background-color:#e5e5e5;font-size:1pt" data-mce-style=3D"width: 1px;=
background-color: #e5e5e5; font-size: 1pt;"> </div></td><td rowspan=
=3D"5" style=3D"vertical-align:middle;width:168px;height:168px;background-c=
olor:rgb(255,255,255);border-collapse:collapse" data-mce-style=3D"vertical-=
align: middle; width: 168px; height: 168px; background-color: #ffffff; bord=
er-collapse: collapse;"><div style=3D"width:168px" align=3D"center" data-mc=
e-style=3D"width: 168px;"><a href=3D"http://www.ntnoa.org/enginebreakin.htm=
" style=3D"text-decoration:none!important;text-decoration:none;color:#00000=
0!important" target=3D"_blank" data-mce-href=3D"http://www.ntnoa.org/engine=
breakin.htm" data-mce-style=3D"text-decoration: none; color: #000000!import=
ant;"><img alt=3D"image" style=3D"display:block;margin:auto" height=3D"168"=
width=3D"168" src=3D"https://s.yimg.com/vv//api/res/1.2/Z4Ek_5CNIidXeHIv3g=
Tdxg--/YXBwaWQ9bWFpbDtmaT1maWxsO2g9MTY4O3c9MTY4/http://www.ntnoa.org/images=
/breakin.gif.cf.jpg" data-mce-style=3D"display: block; margin: auto;" src=
=3D"https://s.yimg.com/vv//api/res/1.2/Z4Ek_5CNIidXeHIv3gTdxg--/YXBwaWQ9bWF=
pbDtmaT1maWxsO2g9MTY4O3c9MTY4/http://www.ntnoa.org/images/breakin.gif.cf.jp=
g"></a></div></td><td rowspan=3D"5" style=3D"width:1px;background-color:#e5=
e5e5;font-size:0pt;border-collapse:collapse" data-mce-style=3D"width: 1px; =
background-color: #e5e5e5; font-size: 0pt; border-collapse: collapse;"><div=
style=3D"width:1px;background-color:#e5e5e5;font-size:1pt" data-mce-style=
=3D"width: 1px; background-color: #e5e5e5; font-size: 1pt;"> </div></t=
d><td rowspan=3D"5" style=3D"width:14px;background-color:#ffffff;font-size:=
0pt;border-collapse:collapse" data-mce-style=3D"width: 14px; background-col=
or: #ffffff; font-size: 0pt; border-collapse: collapse;"><div style=3D"widt=
h:14px;background-color:#ffffff;font-size:14pt" data-mce-style=3D"width: 14=
px; background-color: #ffffff; font-size: 14pt;"> </div></td><td colsp=
an=3D"2" style=3D"height:6px;background-color:#ffffff;font-size:0pt;border-=
collapse:collapse" data-mce-style=3D"height: 6px; background-color: #ffffff=
; font-size: 0pt; border-collapse: collapse;"><div style=3D"min-height:6px;=
background-color:#ffffff;font-size:6pt" data-mce-style=3D"min-height: 6px; =
background-color: #ffffff; font-size: 6pt;"> </div></td><td rowspan=3D=
"5" style=3D"width:20px;background-color:#ffffff;font-size:0pt;border-colla=
pse:collapse" data-mce-style=3D"width: 20px; background-color: #ffffff; fon=
t-size: 0pt; border-collapse: collapse;"><div style=3D"width:20px;backgroun=
d-color:#ffffff;font-size:20pt" data-mce-style=3D"width: 20px; background-c=
olor: #ffffff; font-size: 20pt;"> </div></td><td rowspan=3D"5" style=
=3D"width:1px;background-color:#e5e5e5;font-size:1pt;border-collapse:collap=
se" width=3D"1" data-mce-style=3D"width: 1px; background-color: #e5e5e5; fo=
nt-size: 1pt; border-collapse: collapse;"><div style=3D"width:1px;backgroun=
d-color:#e5e5e5;font-size:1pt" data-mce-style=3D"width: 1px; background-col=
or: #e5e5e5; font-size: 1pt;"> </div></td></tr><tr><td colspan=3D"2" s=
tyle=3D"width:100%;vertical-align:middle;font-family:'Georgia','Times','Tim=
es New Roman','serif'" data-mce-style=3D"width: 100%; vertical-align: middl=
e; font-family: 'Georgia','Times','Times New Roman','serif';"><div style=3D=
"line-height:16.5px;background-color:#ffffff;min-height:135px;width:245px" =
data-mce-style=3D"line-height: 16.5px; background-color: #ffffff; min-heigh=
t: 135px; width: 245px;"><div style=3D"word-wrap:break-word;word-break:brea=
k-all" data-mce-style=3D"word-wrap: break-word; word-break: break-all;"><sp=
an></span><span></span><a href=3D"http://www.ntnoa.org/enginebreakin.htm" s=
tyle=3D"text-decoration:none!important;text-decoration:none;color:#000000!i=
mportant;line-height:100%;font-size:18px;display:block" target=3D"_blank" d=
ata-mce-href=3D"http://www.ntnoa.org/enginebreakin.htm" data-mce-style=3D"t=
ext-decoration: none; color: #000000!important; line-height: 100%; font-siz=
e: 18px; display: block;"><span style=3D"margin:0;font-weight:normal;margin=
-bottom:3px;font-size:18px;line-height:21px;max-height:43px;color:#000000;o=
verflow:hidden!important;display:inline-block" data-mce-style=3D"margin: 0;=
font-weight: normal; margin-bottom: 3px; font-size: 18px; line-height: 21p=
x; max-height: 43px; color: #000000; overflow: hidden!important; display: i=
nline-block;">New Engine Break-in Procedure</span></a><div style=3D"font-si=
ze:13px;line-height:20px;color:#999999;max-height:81px;font-family:'Georgia=
','Times','Times New Roman','serif';overflow:hidden" data-mce-style=3D"font=
-size: 13px; line-height: 20px; color: #999999; max-height: 81px; font-fami=
ly: 'Georgia','Times','Times New Roman','serif'; overflow: hidden;">When a =
cylinder is new or overhauled the surface of it's walls are honed with abra=
sive stones to produce a rough surface that will help wear the piston rings=
...</div></div></div></td></tr><tr><td colspan=3D"2" style=3D"height:4px;b=
ackground-color:#ffffff;font-size:0pt;border-collapse:collapse" data-mce-st=
yle=3D"height: 4px; background-color: #ffffff; font-size: 0pt; border-colla=
pse: collapse;"><div style=3D"min-height:4px;background-color:#ffffff;font-=
size:4pt" data-mce-style=3D"min-height: 4px; background-color: #ffffff; fon=
t-size: 4pt;"><br></div></td></tr><tr><td style=3D"vertical-align:middle;fo=
nt-family:'Arial','Helvetica Neue','Helvetica','sans-serif'" data-mce-style=
=3D"vertical-align: middle; font-family: 'Arial','Helvetica Neue','Helvetic=
a','sans-serif';"><div style=3D"font-size:0pt" data-mce-style=3D"font-size:=
0pt;"><a href=3D"http://www.ntnoa.org/enginebreakin.htm" style=3D"color:bl=
ack;text-decoration:none!important;text-decoration:none" target=3D"_blank" =
data-mce-href=3D"http://www.ntnoa.org/enginebreakin.htm" data-mce-style=3D"=
color: black; text-decoration: none;"><span style=3D"display:inline-block;l=
ine-height:11px;max-width:145px;min-width:85px;overflow:hidden;max-height:1=
3px;word-break:break-all" data-mce-style=3D"display: inline-block; line-hei=
ght: 11px; max-width: 145px; min-width: 85px; overflow: hidden; max-height:=
13px; word-break: break-all;"><span style=3D"vertical-align:middle;font-si=
ze:9px;line-height:11px;color:#999999" data-mce-style=3D"vertical-align: mi=
ddle; font-size: 9px; line-height: 11px; color: #999999;">View on <span sty=
le=3D"font-weight:bold" data-mce-style=3D"font-weight: bold;">www.ntnoa.org=
</span></span></span></a></div></td><td style=3D"vertical-align:middle;widt=
h:100px;font-family:'Arial','Helvetica Neue','Helvetica','sans-serif'" data=
-mce-style=3D"vertical-align: middle; width: 100px; font-family: 'Arial','H=
elvetica Neue','Helvetica','sans-serif';"><div style=3D"max-width:100px;min=
-width:80px;overflow:hidden;text-align:right;line-height:11px;max-height:13=
px;font-size:0pt" data-mce-style=3D"max-width: 100px; min-width: 80px; over=
flow: hidden; text-align: right; line-height: 11px; max-height: 13px; font-=
size: 0pt;"><span style=3D"vertical-align:middle;font-size:9px;line-height:=
11px;color:#999999" data-mce-style=3D"vertical-align: middle; font-size: 9p=
x; line-height: 11px; color: #999999;">Preview by Yahoo</span></div></td></=
tr><tr><td colspan=3D"2" style=3D"height:9px;background-color:#ffffff;font-=
size:0pt;border-collapse:collapse" data-mce-style=3D"height: 9px; backgroun=
d-color: #ffffff; font-size: 0pt; border-collapse: collapse;"><div style=3D=
"min-height:9px;background-color:#ffffff;font-size:9pt" data-mce-style=3D"m=
in-height: 9px; background-color: #ffffff; font-size: 9pt;"><br></div></td>=
</tr><tr><td colspan=3D"8" style=3D"height:1px;background-color:#e5e5e5;fon=
t-size:1px;border-collapse:collapse" data-mce-style=3D"height: 1px; backgro=
und-color: #e5e5e5; font-size: 1px; border-collapse: collapse;"><div style=
=3D"min-height:1px;background-color:#e5e5e5;font-size:1px;line-height:0px" =
data-mce-style=3D"min-height: 1px; background-color: #e5e5e5; font-size: 1p=
x; line-height: 0px;"> </div></td></tr></tbody></table></div><div dir=
=3D"ltr"><span>Mike MacLean</span></div><div><br><div><br></div></div><div =
style=3D"display:block" data-mce-style=3D"display: block;"><div style=3D"fo=
nt-family:times new roman,new york,times,serif;font-size:16px" data-mce-sty=
le=3D"font-family: times new roman,new york,times,serif; font-size: 16px;">=
<div style=3D"font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Luci=
da Grande,sans-serif;font-size:16px" data-mce-style=3D"font-family: Helveti=
caNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif; font-size: =
16px;"><div dir=3D"ltr"><br></div></div></div></div></div></div></blockquot=
e></div></div><div><br></div></div><div><br></div></div></body></html>
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_______________________________________________
Archive: http://www.team.net/archive
Healeys@autox.team.net
http://autox.team.net/mailman/listinfo/healeys
--===============4838220801848942903==--
|