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yet another OPRV question #365594
03/29/11 7:24 pm
03/29/11 7:24 pm
Joined: Mar 2006
Posts: 3,718
gastonia nc
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raf940 Online content OP
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ok so my A65 bitsa has 66 cases and flatfaced/ball type OPRV....the OPRV on my pal calvin's 72 A65T had domed face and piston innards...so does the OPRV on my 72 T120....ok..so are Triumph and late BSA OPRVs interchangeable with early ball type??? just ponderigng another bit of tinkering but dont want to open a can o worms
PS I see lots o the Triumph domed type on eBay some new some used

Last edited by raf940; 03/29/11 7:25 pm.

1972 Triumph T120
1968 BSA A65
1968 MGB Roadster
1979 Chevrolet Camaro Berlinetta
1969 Honda Mini Trail
1939 farmall f30 tractor
2004 Honda Shadow Aero
1972 BSA Thunderbolt
1975 yamaha xs650b
1972 Norton commando project
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Re: yet another OPRV question [Re: ] #365615
03/29/11 8:58 pm
03/29/11 8:58 pm
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Posts: 3,718
gastonia nc
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raf940 Online content OP
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raf940  Online Content OP
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but is it the dome/piston type the same piece for both BSA and Triumph??


1972 Triumph T120
1968 BSA A65
1968 MGB Roadster
1979 Chevrolet Camaro Berlinetta
1969 Honda Mini Trail
1939 farmall f30 tractor
2004 Honda Shadow Aero
1972 BSA Thunderbolt
1975 yamaha xs650b
1972 Norton commando project
Re: yet another OPRV question [Re: raf940] #365627
03/29/11 8:33 pm
03/29/11 8:33 pm
Joined: Sep 2002
Posts: 7,813
Seattle
Alex Offline

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Alex  Offline

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Seattle
Originally Posted By: raf940
but is it the dome/piston type the same piece for both BSA and Triumph??


They fit, they may even work (are you willing to try?) but they are not the same.


A smattering:
'53 Gold Flash
'67 Royal Star
'71 Rickman Metisse
'40 Silver Star
'37 Rudge Special
sixtyseventy Lightboltrocket road racer...and many more.
Re: yet another OPRV question [Re: raf940] #366278
04/02/11 8:55 pm
04/02/11 8:55 pm
Joined: Oct 2008
Posts: 4,994
Gnashville
DavidP Offline

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Gnashville
The BSA OPRV opens at 50psi, the Triumph at 60psi. As I recall, the SRM opens at 60psi (one reason it results in better oil pressure?)
The one you really don't want is the OPRV for triples. That one opens at 75psi.


Stepping on others doesn't make you stand tall.

71 A65L "Zelda"
92 BMW K100rs "Gustav"
72 T120V cafe project "Mr. Jim"
Re: yet another OPRV question [Re: raf940] #366315
04/03/11 12:19 am
04/03/11 12:19 am
Joined: Aug 2001
Posts: 3,884
Cape Carteret, NC
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Mr Mike Offline
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Cape Carteret, NC
Raf,
I took a domed one out of a late b44 or B50 I think. Could not see why it would't work. I was not much concerned about 50, 60 , or 75 psi. I want 40 psi cruising and at least 10-20 at idle and so far I have it.

Mr Mike

Re: yet another OPRV question [Re: raf940] #366336
04/03/11 3:19 am
04/03/11 3:19 am
Joined: Jan 2004
Posts: 3,697
ca, us
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DMadigan Offline
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ca, us
I am not sure of the setting for a B50 but it has a needle bearing rod and roller/ball crank do it does not need nearly the pressure of a plain bearing.

Re: yet another OPRV question [Re: raf940] #366359
04/03/11 6:49 am
04/03/11 6:49 am
Joined: Dec 2004
Posts: 9,324
Scotland
kommando Offline
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Scotland
The B50 one is set for 50psi, it just never operates.

Re: yet another OPRV question [Re: kommando] #366390
04/03/11 1:33 pm
04/03/11 1:33 pm
Joined: Aug 2001
Posts: 3,884
Cape Carteret, NC
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Mr Mike Offline
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What is a safe operating pressure? Modern cars run about 70 maybe 75 psi. I am not so concerned about my bush as it is a much harder material that the original Vandervell. The rods have aftermarket shells. Early bearings were soft to provide embedability so grit would not damage the crank. With modern filtering systems, is that any longer important??? I dunno!

Mr Mike

Re: yet another OPRV question [Re: raf940] #366401
04/03/11 2:13 pm
04/03/11 2:13 pm
Joined: Dec 2004
Posts: 9,324
Scotland
kommando Offline
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BSA seemed to use Whitemetal bearings which are soft and need greater protection from cavity erosion caused by excessive pressure, both Triumph and Norton look to have used Copper lead plated with lead indium which is a stronger base material with a very thin soft surface so need less protection.

All the replacements made by Glacier are aluminium tin with no plating and this is a harder surface than whitemetal or the plated lead indium surface, but the core is not so stong as Cu/Pb, so it performs in between. It is the material used in the majority of todays cooking autos. http://www.mahle.com/C12570B3006C0D49/CurrentBaseLink/W27P6HZ2575STULEN For high performance auto engines today they use exotic materials such as sputter http://www.mahle.com/C12570B3006C0D49/CurrentBaseLink/W26MAE7Q320STULEN .

So if you use the Glacier replacements you can go to 60 psi on a BSA.

I am sure the whitemetal in the A65 was a partial cause of the problems the A65 is percieved as having as the margin for error is decreased in the oil supply by using a soft bearing material as it overheats easily once the oil layer in the bearing is compromised.

Last edited by kommando; 04/03/11 2:18 pm.
Re: yet another OPRV question [Re: kommando] #366420
04/03/11 5:00 pm
04/03/11 5:00 pm
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EWebster Offline
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Rod bearings : VP-D2 Microbabbit lined steel

Last edited by EWebster; 04/03/11 6:42 pm. Reason: corrected mis informaion
Re: yet another OPRV question [Re: raf940] #366425
04/03/11 5:06 pm
04/03/11 5:06 pm
Joined: Dec 2004
Posts: 9,324
Scotland
kommando Offline
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Big end bearings are whitemetal, I was not refering to the bush.

Re: yet another OPRV question [Re: kommando] #366435
04/03/11 6:40 pm
04/03/11 6:40 pm
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EWebster Offline
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okay, I see that now

Re: yet another OPRV question [Re: raf940] #366597
04/04/11 3:58 pm
04/04/11 3:58 pm
Joined: Dec 2004
Posts: 9,324
Scotland
kommando Offline
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Scotland
The B25 Unit Single bearings I have seen out of old engines are Whitemetal too, can only think this was BSA purchasing in league with Vandervell whose only option if forced to provide a cheaper bearing than the proper VP2 Trimetal had to supply Whitemetal (babbit) as they did not have the Aluminium/Tin technology in the 60's, they finally got Al/Tin in the 80's when they bought a bearing factory in Italy.


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