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OK, so now you have me worried about my Harley Davidson next time I freshen=
up the top end.=C2=A0 It is an air cooled flat tappet cam engine.=C2=A0 I =
don't remember when I brought it home new in 2002, the owner's manual sayin=
g run flat out to seat the rings.Mike MacLean
=20
On Monday, August 29, 2016 6:14 PM, Bob Spidell <bspidell@comcast.net> =
wrote:
=20
=20
The break-in procedures for air-cooled motorcycles is very similar to that=
for (air-cooled) aircraft piston engines. =C2=A0Because the clearances are=
greater in air-cooled engines--to allow for greater and varying metals exp=
ansion rates--the emphasis is on bedding-in the rings (although these engin=
es also have flat-tapped, OHV valve trains). =C2=A0That 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. =C2=A0
A point not mentioned in the motorcycle procedure is that breaking in an en=
gine at high altitude might be problematic, since you won't get the same BM=
EP at, say, 5,000 feet that you would at sea level (non-turboed and non-sup=
ercharged engines, of course). =C2=A0For 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). =C2=A0The rich mixture is to used =
to wash oil off the cylinder walls to promote break-in and prevent oil glaz=
ing (I've heard of desperate airplane owners--who may have spent $50K or mo=
re on an engine rebuild--dumping Bon Ami into cylinders in the hope it will=
break the glaze). =C2=A0Since an SU carb's mixture can be set across the R=
PM range it might be a good idea to run them extra rich for the first 500 m=
iles 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 spe=
ed and RPM. Not sure why we did this, something about seating the piston =
=C2=A0rings.=C2=A0Clearly many ways to run in a new engine
Ira ErbsPortland,OR=C2=A0 =C2=A0 =C2=A0 _______ =C2=A0 =C2=A0 =C2=A0 =C2=A0=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0_______
=C2=A0 =C2=A0=C2=A0 (______ \____1959 BN4____/ _______)
=C2=A0 =C2=A0 =C2=A0 =C2=A0=C2=A0 (_________________________)=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 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:
=C2=A0A friend who recently past away in January that had been rebuilding H=
ealey motors for over forty years told me he just gets them started and idl=
es them for a while and then runs them gently for a 100 miles or so, change=
s the oil and then it's your choice how careful of a break in you want to d=
o.=C2=A0 He said he never had a problem with them or the cams during break =
in.=C2=A0 Go figure.=C2=A0 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.=C2=A0=
They are talking about a motorcycle, so I am not sure if applies in our ca=
se, but an interesting read.New Engine Break-in Procedure
| =C2=A0 |
| =C2=A0 | | =C2=A0 | =C2=A0 | =C2=A0 | =C2=A0 | =C2=A0 |
| New Engine Break-in ProcedureWhen a cylinder is new or overhauled the sur=
face of it's walls are honed with abrasive stones to produce a rough surfac=
e that will help wear the piston rings ... |
|=20
|
| View on www.ntnoa.org | Preview by Yahoo |
|=20
|
| =C2=A0 |
Mike MacLean
_______________________________________________
Archive: http://www.team.net/archive
Healeys@autox.team.net
http://autox.team.net/mailman/listinfo/healeys
r.mike@att.net
=20
=20
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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 id=
=3D"yui_3_16_0_ym19_1_1472506099114_97757">OK, so now you have me worried a=
bout my Harley Davidson next time I freshen up the top end. It is an =
air cooled flat tappet cam engine. I don't remember when I brought it=
home new in 2002, the owner's manual saying run flat out to seat the rings=
.</div><div id=3D"yui_3_16_0_ym19_1_1472506099114_97806" dir=3D"ltr">Mike M=
acLean<br></div><div id=3D"yui_3_16_0_ym19_1_1472506099114_97500"><span></s=
pan></div> <div class=3D"qtdSeparateBR"><br><br></div><div style=3D"display=
: block;" class=3D"yahoo_quoted"> <div style=3D"font-family: times new roma=
n, new york, times, serif; font-size: 16px;"> <div style=3D"font-family: He=
lveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; f=
ont-size: 16px;"> <div dir=3D"ltr"><font size=3D"2" face=3D"Arial"> On Mond=
ay, August 29, 2016 6:14 PM, Bob Spidell <bspidell@comcast.net> wrote=
:<br></font></div> <blockquote style=3D"border-left: 2px solid rgb(16, 16, =
255); margin-left: 5px; margin-top: 5px; padding-left: 5px;"> <br><br> <div=
class=3D"y_msg_container"><div id=3D"yiv2014220911"><div><div style=3D"fon=
t-family:Arial;font-size:12pt;color:#000000;"><div>The break-in procedures =
for air-cooled motorcycles is very similar to that for (air-cooled) aircraf=
t piston engines. Because the clearances are greater in air-cooled en=
gines--to allow for greater and varying metals expansion rates--the emphasi=
s 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 st=
ill a concern--in our water cooled engines, where cam/tappet break-in appea=
rs to be critical. </div><div><br clear=3D"none"></div><div>A point n=
ot mentioned in the motorcycle procedure is that breaking in an engine at h=
igh altitude might be problematic, since you won't get the same BMEP at, sa=
y, 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 a=
t 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 o=
il 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 th=
e 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 s=
o.</div><div><br clear=3D"none"></div><div>Bob</div><div class=3D"yiv201422=
0911yqt6069211393" id=3D"yiv2014220911yqtfd99192"><div><br clear=3D"none"><=
/div><div style=3D"color:#000;font-weight:normal;font-style:normal;text-dec=
oration:none;font-family:Helvetica, Arial, sans-serif;font-size:12pt;"><br =
clear=3D"none"><div><br clear=3D"none"></div><div dir=3D"ltr">I always drov=
e gently for first 100 miles changing rpms and speed, changed oil, then con=
tinued to drive and change oil again at 500 miles. Varying speed and RPM. N=
ot sure why we did this, something about seating the piston rings.&nb=
sp;<div>Clearly many ways to run in a new engine</div></div><div class=3D"y=
iv2014220911gmail_extra"><br clear=3D"all"><div><div class=3D"yiv2014220911=
gmail_signature"><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"lt=
r"><div dir=3D"ltr">Ira Erbs<div>Portland,OR</div><div><span style=3D"font-=
family:'Times New Roman', serif;"> _______  =
; &nb=
sp; _______</span><br style=3D"font-family:'Time=
s New Roman', serif;" clear=3D"none"><span style=3D"font-family:'Times New =
Roman', serif;"> (______ \____1959 BN4____/ _______)</sp=
an><br style=3D"font-family:'Times New Roman', serif;" clear=3D"none"><span=
style=3D"font-family:'Times New Roman', serif;">  =
; (_________________________)</span></div><div> &=
nbsp; BT7 engine and disk brakes</div><div><br clear=3D"none"></div>=
<div>Please excuse random auto corrects and misspelled words</div></div></d=
iv></div></div></div></div></div></div><br clear=3D"none"><div class=3D"yiv=
2014220911gmail_quote">On Sun, Aug 28, 2016 at 10:11 PM, Michael MacLean <s=
pan dir=3D"ltr"><<a rel=3D"nofollow" shape=3D"rect" ymailto=3D"mailto:rr=
engineer.mike@att.net" target=3D"_blank" href=3D"mailto:rrengineer.mike@att=
.net">rrengineer.mike@att.net</a>></span> wrote:<br clear=3D"none"><bloc=
kquote class=3D"yiv2014220911gmail_quote" style=3D"margin:0 0 0 .8ex;border=
-left:1px #ccc solid;padding-left:1ex;"><div><div style=3D"color:#000;backg=
round-color:#fff;font-family:times new roman, new york, times, serif;font-s=
ize:16px;"><div> A friend who recently past away in January that had b=
een 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 mil=
es 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 ca=
ms 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 a=
pplies in our case, but an interesting read.</div><div dir=3D"ltr"><a rel=
=3D"nofollow" shape=3D"rect" target=3D"_blank" href=3D"http://www.ntnoa.org=
/enginebreakin.htm">New Engine Break-in Procedure</a><br clear=3D"none"></d=
iv><div style=3D"width:450px;font-family:'Georgia', 'Times', 'Times New Rom=
an', 'serif';margin-top:5px;margin-bottom:5px;background-color:#ffffff;"><t=
able class=3D"yiv2014220911mceItemTable yahoo-compose-table-card" style=3D"=
width:450px;min-height:170px;display:block;" border=3D"0" cellpadding=3D"0"=
cellspacing=3D"0"><tbody><tr><td colspan=3D"8" rowspan=3D"1" style=3D"min-=
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;"> </div></td></tr><tr><td colspan=3D"1" rowspan=3D"5" styl=
e=3D"width:1px;background-color:#e5e5e5;font-size:1pt;border-collapse:colla=
pse;"><div style=3D"width:1px;background-color:#e5e5e5;font-size:1pt;">&nbs=
p;</div></td><td colspan=3D"1" rowspan=3D"5" style=3D"vertical-align:middle=
;width:168px;min-height:168px;background-color:rgb(255,255,255);border-coll=
apse:collapse;"><div style=3D"width:168px;" align=3D"center"><a rel=3D"nofo=
llow" shape=3D"rect" target=3D"_blank" href=3D"http://www.ntnoa.org/engineb=
reakin.htm" style=3D"text-decoration:none!important;text-decoration:none;co=
lor:#000000!important;"><img alt=3D"image" style=3D"display:block;margin:au=
to;" src=3D"https://s.yimg.com/vv//api/res/1.2/Z4Ek_5CNIidXeHIv3gTdxg--/YXB=
waWQ9bWFpbDtmaT1maWxsO2g9MTY4O3c9MTY4/http://www.ntnoa.org/images/breakin.g=
if.cf.jpg" height=3D"168" width=3D"168"></a></div></td><td colspan=3D"1" ro=
wspan=3D"5" style=3D"width:1px;background-color:#e5e5e5;font-size:0pt;borde=
r-collapse:collapse;"><div style=3D"width:1px;background-color:#e5e5e5;font=
-size:1pt;"> </div></td><td colspan=3D"1" rowspan=3D"5" style=3D"width=
:14px;background-color:#ffffff;font-size:0pt;border-collapse:collapse;"><di=
v style=3D"width:14px;background-color:#ffffff;font-size:14pt;"> </div=
></td><td colspan=3D"2" rowspan=3D"1" style=3D"min-height:6px;background-co=
lor:#ffffff;font-size:0pt;border-collapse:collapse;"><div style=3D"min-heig=
ht:6px;background-color:#ffffff;font-size:6pt;"> </div></td><td colspa=
n=3D"1" rowspan=3D"5" style=3D"width:20px;background-color:#ffffff;font-siz=
e:0pt;border-collapse:collapse;"><div style=3D"width:20px;background-color:=
#ffffff;font-size:20pt;"> </div></td><td colspan=3D"1" rowspan=3D"5" s=
tyle=3D"width:1px;background-color:#e5e5e5;font-size:1pt;border-collapse:co=
llapse;" width=3D"1"><div style=3D"width:1px;background-color:#e5e5e5;font-=
size:1pt;"> </div></td></tr><tr><td colspan=3D"2" rowspan=3D"1" style=
=3D"width:100%;vertical-align:middle;font-family:'Georgia', 'Times', 'Times=
New Roman', 'serif';"><div style=3D"line-height:16.5px;background-color:#f=
fffff;min-height:135px;width:245px;"><div style=3D"word-wrap:break-word;"><=
span></span><span></span><a rel=3D"nofollow" shape=3D"rect" target=3D"_blan=
k" href=3D"http://www.ntnoa.org/enginebreakin.htm"; style=3D"text-decoration=
:none!important;text-decoration:none;color:#000000!important;line-height:10=
0%;font-size:18px;display:block;"><span style=3D"margin:0;font-weight:norma=
l;margin-bottom:3px;font-size:18px;line-height:21px;max-height:43px;color:#=
000000;overflow:hidden!important;display:inline-block;">New Engine Break-in=
Procedure</span></a><div style=3D"font-size:13px;line-height:20px;color:#9=
99999;max-height:81px;font-family:'Georgia', 'Times', 'Times New Roman', 's=
erif';overflow:hidden;">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 ...</div></div></div></td></tr><tr><td cols=
pan=3D"2" rowspan=3D"1" style=3D"min-height:4px;background-color:#ffffff;fo=
nt-size:0pt;border-collapse:collapse;"><div style=3D"min-height:4px;backgro=
und-color:#ffffff;font-size:4pt;"><br clear=3D"none"></div></td></tr><tr><t=
d colspan=3D"1" rowspan=3D"1" style=3D"vertical-align:middle;font-family:'A=
rial', 'Helvetica Neue', 'Helvetica', 'sans-serif';"><div style=3D"font-siz=
e:0pt;"><a rel=3D"nofollow" shape=3D"rect" target=3D"_blank" href=3D"http:/=
/www.ntnoa.org/enginebreakin.htm" style=3D"color:black;text-decoration:none=
!important;text-decoration:none;"><span style=3D"display:inline-block;line-=
height:11px;max-width:145px;min-width:85px;overflow:hidden;max-height:13px;=
"><span style=3D"vertical-align:middle;font-size:9px;line-height:11px;color=
:#999999;">View on <span style=3D"font-weight:bold;">www.ntnoa.org</span></=
span></span></a></div></td><td colspan=3D"1" rowspan=3D"1" style=3D"vertica=
l-align:middle;width:100px;font-family:'Arial', 'Helvetica Neue', 'Helvetic=
a', 'sans-serif';"><div style=3D"max-width:100px;min-width:80px;overflow:hi=
dden;text-align:right;line-height:11px;max-height:13px;font-size:0pt;"><spa=
n style=3D"vertical-align:middle;font-size:9px;line-height:11px;color:#9999=
99;">Preview by Yahoo</span></div></td></tr><tr><td colspan=3D"2" rowspan=
=3D"1" style=3D"min-height:9px;background-color:#ffffff;font-size:0pt;borde=
r-collapse:collapse;"><div style=3D"min-height:9px;background-color:#ffffff=
;font-size:9pt;"><br clear=3D"none"></div></td></tr><tr><td colspan=3D"8" r=
owspan=3D"1" style=3D"min-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;"> </div></td></tr></tbody></tabl=
e></div><div dir=3D"ltr"><span>Mike MacLean</span></div><div><br clear=3D"n=
one"><div><br clear=3D"none"></div></div><div style=3D"display:block;"><div=
style=3D"font-family:times new roman, new york, times, serif;font-size:16p=
x;"><div style=3D"font-family:HelveticaNeue, Helvetica Neue, Helvetica, Ari=
al, Lucida Grande, sans-serif;font-size:16px;"><div dir=3D"ltr"><br clear=
=3D"none"></div></div></div></div></div></div></blockquote></div></div><div=
><br clear=3D"none"></div></div><div><br clear=3D"none"></div></div></div><=
/div></div><br><div class=3D"yqt6069211393" id=3D"yqtfd44418">_____________=
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_______________________________________________
Archive: http://www.team.net/archive
Healeys@autox.team.net
http://autox.team.net/mailman/listinfo/healeys
--===============8962657971314485020==--
|