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I assemble ODs using the original metal rings and have not had any=0Aiss=
ues with pressure or engagement/disengagement.=0AWhen Mr. DeNormanville=
stayed up in the middle of the night to=0Aengineer the operation of the=
unit, I think he decided that the use of=0Asofter rings (sacrificial me=
tal) against a hardened casing was the=0Abest solution for control and w=
ear. If a rubber o-ring was a better=0Asolution, he would have used one=
with the proper buna rating.=0AI think the bigger problem, now-a-days,=
is the availability of the=0Ametal piston rings. Rubber O rings are a d=
ime-a-dozen. If you contact=0AOverdrive Spares in the UK, they should be=
able to supply the proper=0Arings. If they too, have decided to go with=
rubber, then plan on a=0Abreakdown/rebuild in a shorter period of time=
than units equipped with=0Athe original parts that last a long, long ti=
me. Hank=0A=0A=09-----------------------------------------From: "Michael=
Salter" =0ATo: "healeys@autox.team.net"=0ACc: =0ASent: Wednesday August=
3 2022 9:38:15AM=0ASubject: Re: [Healeys] DW overdrive piston=0A=0A I=
have a question about the "O" ring type of accumulator. The way=0Athe a=
ccumulator works is that when it is fully charged the piston=0Amoves aga=
inst the spring until the rings reach the radial holes in the=0Awall of=
the housing which acts to relieve any excess pressure. My=0Aconcern is=
that at 3 - 400 p.s.i. oil will obviously get behind the=0A"O" ring and=
force the material of the "O" ring into those radial=0Aholes and then,=
as the piston moves back over them, a piece of the=0Aring will shear of=
f. I'm guessing that Laycock-DeNormanville used the=0Acomplex cast iron=
rings rather than "O" rings because they recognized=0Athe possibility o=
f this happening.=0A I'm sure that tiny pieces of the "O" ring would be=
found in the=0Afilter if this was a problem. Anyone found them or notic=
ed damage to=0Atheir accumulator "O" ring upon disassembly?=0A=0A M=0A=
=0A On Wed, Aug 3, 2022 at 9:08 AM Bob Spidell wrote:=0A I put one in=
my BJ8's O/D. It's subjective*--O/Ds seem to work a=0Alittle=0A quicker=
with cold, thick oil than hot oil--but it cuts maybe a third=0Aoff=0A e=
ngagement time on average. I had the O/D on the bench and=0Adisassembled=
,=0A and the current one had a scored barrel so, why not? Engagement isn=
't=0A much, if any, harsher than before which, I believe is the reason D=
MH=0A wanted the weaker, smaller spring. If I'd known about it, I might=
=0Ahave=0A bought AHSpares' with an O-ring instead.=0A=0A * I've never r=
eally 'timed' O/D functioning, it would be a bit=0Aawkward;=0A anyone do=
ne it? I usually tap the clutch pedal when engaging O/D, and=0A give a l=
ittle throttle when disengaging. I thought mine engaged a=0Alittle=0A qu=
icker when I switched to synthetic fluid from engine oil, but in=0Aall=
=0A cases confirmation bias may be involved.=0A=0A On 8/2/2022 8:09 PM,=
Joseph Costa wrote:=0A > Has anyone installed their upgraded overdrive=
piston? If so, is it=0A > worth the trouble ?=0A >=0A > Joe=0A > BN1 #9=
23=0A >=0A=0A _______________________________________________=0A Support=
Team.Net [1]http://www.team.net/donate.html [2]=0A Suggested annual do=
nation $12.75=0A=0A Archive: [3]http://www.team.net/pipermail/healeys [=
4] =0A[5]http://autox.team.net/archive/healeys [6]=0A=0AHealeys@autox.te=
am.net=0A [7]http://autox.team.net/mailman/listinfo/healeys [8]=0A=0A Un=
subscribe/Manage: =0A[9]http://autox.team.net/mailman/options/healeys/mi=
chaelsalter@gmail.com=0A[10]=0A=0A =0A=0ALinks:=0A------=0A[1] http://w=
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m.net/archive/healeys=0A[7] http://autox.team.net/mailman/listinfo/heale=
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<html><body>I assemble ODs using the original metal rings and have not h=
ad any issues with pressure or engagement/disengagement.<div><br></div><=
div>When Mr. DeNormanville stayed up in the middle of the night to engin=
eer the operation of the unit, I think he decided that the use of=
softer rings (sacrificial metal) against a hardened casing was the best=
solution for control and wear. If a rubber o-ring was a better so=
lution, he would have used one with the proper buna rating.</div><div><b=
r></div><div>I think the bigger problem, now-a-days, is the availability=
of the metal piston rings. Rubber O rings are a dime-a-dozen.&nbs=
p; If you contact Overdrive Spares in the UK, they should be able to sup=
ply the proper rings. If they too, have decided to go with rubber,=
then plan on a breakdown/rebuild in a shorter period of time than units=
equipped with the original parts that last a long, long time. Hank<br><=
br><div class=3D"reply-new-signature"></div><p>-------------------------=
----------------</p>From: "Michael Salter" <michaelsalter@gmail.com><br>=
To: "healeys@autox.team.net"<br>Cc: <br>Sent: Wednesday August 3 2022 9:=
38:15AM<br>Subject: Re: [Healeys] DW overdrive piston<br><br>=0A<div dir=
=3D"ltr">=0A<div class=3D"gmail_default" style=3D"font-family:arial, san=
s-serif;font-size:small;">I have a question=0Aabout the "O" ring type of=
accumulator.</div>=0A<div class=3D"gmail_default" style=3D"font-family:=
arial, sans-serif;font-size:small;">The way the=0Aaccumulator works is t=
hat when it is fully charged the piston moves=0Aagainst the spring until=
the rings reach the radial holes in the=0Awall of the housing which act=
s to relieve any excess=0Apressure.</div>=0A<div class=3D"gmail_default"=
style=3D"font-family:arial, sans-serif;font-size:small;">My concern is=
that=0Aat 3 - 400 p.s.i. oil will obviously get behind the "O" ring and=
=0Aforce the material of the "O" ring into those radial holes and=0Athen=
, as the piston moves back over them, a piece of the ring will=0Ashear o=
ff.</div>=0A<div class=3D"gmail_default" style=3D"font-family:arial, san=
s-serif;font-size:small;">I'm guessing that=0ALaycock-DeNormanville used=
the complex cast iron rings rather than=0A"O" rings because they recogn=
ized the possibility of this=0Ahappening.<br></div>=0A<div class=3D"gmai=
l_default" style=3D"font-family:arial, sans-serif;font-size:small;"></di=
v>=0A<div class=3D"gmail_default" style=3D"font-family:arial, sans-serif=
;font-size:small;">I'm sure that tiny=0Apieces of the "O" ring would be=
found in the filter if this was a=0Aproblem. Anyone found them or notic=
ed damage to their accumulator=0A"O" ring upon disassembly?<br></div>=0A=
<div class=3D"gmail_default" style=3D"font-family:arial, sans-serif;font=
-size:small;"><br></div>=0A<div class=3D"gmail_default" style=3D"font-fa=
mily:arial, sans-serif;font-size:small;">M<br></div>=0A<div class=3D"gma=
il_default" style=3D"font-family:arial, sans-serif;font-size:small;"><br=
></div>=0A</div>=0A<br><div class=3D"gmail_quote">=0A<div dir=3D"ltr" cl=
ass=3D"gmail_attr">On Wed, Aug 3, 2022 at 9:08 AM=0ABob Spidell <<a>b=
spidell@comcast.net</a>>=0Awrote:<br></div>=0A<blockquote class=3D"gm=
ail_quote" style=3D"margin:0px 0px 0px .8ex;border-left:1px solid rgb(20=
4,204,204);padding-left:1ex;">=0AI put one in my BJ8's O/D. It's subject=
ive*--O/Ds seem to work a=0Alittle<br>=0Aquicker with cold, thick oil th=
an hot oil--but it cuts maybe a=0Athird off<br>=0Aengagement time on ave=
rage. I had the O/D on the bench and=0Adisassembled,<br>=0Aand the curre=
nt one had a scored barrel so, why not? Engagement=0Aisn't<br>=0Amuch, i=
f any, harsher than before which, I believe is the reason=0ADMH<br>=0Awa=
nted the weaker, smaller spring. If I'd known about it, I might=0Ahave<b=
r>=0Abought AHSpares' with an O-ring instead.<br><br>=0A* I've never rea=
lly 'timed' O/D functioning, it would be a bit=0Aawkward;<br>=0Aanyone d=
one it? I usually tap the clutch pedal when engaging O/D,=0Aand<br>=0Agi=
ve a little throttle when disengaging. I thought mine engaged a=0Alittle=
<br>=0Aquicker when I switched to synthetic fluid from engine oil, but i=
n=0Aall<br>=0Acases confirmation bias may be involved.<br><br><br><br>=
=0AOn 8/2/2022 8:09 PM, Joseph Costa wrote:<br>=0A> Has anyone instal=
led their upgraded overdrive piston? If=0Aso, is it<br>=0A> wor=
th the trouble ?<br>=0A><br>=0A> Joe<br>=0A> BN1 #923<br>=0A>=
;<br><br>=0A_______________________________________________<br>=0ASuppor=
t Team.Net <a href=3D"http://www.team.net/donate.html";></a><a href=3D"ht=
tp://www.team.net/donate.html">http://www.team.net/donate.html</a><br>=
=0ASuggested annual donation $12.75<br><br>=0AArchive: <a href=3D"=
http://www.team.net/pipermail/healeys";></a><a href=3D"http://www.team.ne=
t/pipermail/healeys">http://www.team.net/pipermail/healeys</a> <a href=
=3D"http://autox.team.net/archive/healeys";></a><a href=3D"http://autox.t=
eam.net/archive/healeys">http://autox.team.net/archive/healeys</a><br><b=
r><a>Healeys@autox.team.net</a><br><a href=3D"http://autox.team.net/mail=
man/listinfo/healeys"></a><a href=3D"http://autox.team.net/mailman/listi=
nfo/healeys">http://autox.team.net/mailman/listinfo/healeys</a><br><br>=
=0AUnsubscribe/Manage: <a href=3D"http://autox.team.net/mailman/options/=
healeys/michaelsalter@gmail.com"></a><a href=3D"http://autox.team.net/ma=
ilman/options/healeys/michaelsalter@gmail.com">http://autox.team.net/mai=
lman/options/healeys/michaelsalter@gmail.com</a><br><br></blockquote>=0A=
</div>=0A</michaelsalter@gmail.com></div></body></html>
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