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Cartridge Filter on A65 #740642
07/03/18 4:45 pm
07/03/18 4:45 pm
Joined: Nov 2007
Posts: 115
uk
trig Offline OP
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trig  Offline OP
BritBike Forum member

Joined: Nov 2007
Posts: 115
uk
I fitted the Norton Commando style set up to my 1966 A65 years ago. At the time I am sure the advice on a BSA UK website was to puncture the rubber diaphragm through the small outer holes in the face of the filter. I seem to remember that this was to improve the oil flow on the return. I burn the rubber away using a hot metal rod.
I just did a search and couldn't find any reference to doing this. Have I been doing the wrong thing?
Thanks.

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Re: Cartridge Filter on A65 [Re: trig] #740656
07/03/18 7:33 pm
07/03/18 7:33 pm
Joined: Mar 2006
Posts: 1,441
Magnolia, TX
htown Online content
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htown  Online Content
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Joined: Mar 2006
Posts: 1,441
Magnolia, TX
Well I run the commando setup on commandos and have never done that or heard of anyone in the Norton world ever mention it.


1978 Bonneville T140E
1974 Trident
1970 BSA Thunderbolt
1971 Norton Commando
1972 Norton Commando
1973 Norton Commando
1974 Norton Commando
2004 XL 1200R Sportster

Everything will be alright in the end. If its not alright, its not the end.
Re: Cartridge Filter on A65 [Re: htown] #740661
07/03/18 8:36 pm
07/03/18 8:36 pm
Joined: Mar 2006
Posts: 3,830
gastonia nc
R
raf940 Offline
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raf940  Offline
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R

Joined: Mar 2006
Posts: 3,830
gastonia nc
i have commando head/filter on my A65 for several years never been thar nor done that


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
2 olive drab WWII military bicycle replicas
Re: Cartridge Filter on A65 [Re: htown] #740662
07/03/18 8:36 pm
07/03/18 8:36 pm
Joined: Mar 2006
Posts: 3,830
gastonia nc
R
raf940 Offline
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raf940  Offline
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R

Joined: Mar 2006
Posts: 3,830
gastonia nc
i have commando head/filter on my A65 for several years never been thar nor done that....my engine is 66 as well


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
2 olive drab WWII military bicycle replicas
Re: Cartridge Filter on A65 [Re: trig] #740673
07/03/18 11:38 pm
07/03/18 11:38 pm
Joined: Jan 2014
Posts: 4,346
Aus
N
NickL Online content
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NickL  Online Content
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N

Joined: Jan 2014
Posts: 4,346
Aus
There is a myth that the pressure required to push oil through some of these filters causes the bike to wet sump.
That's probably why some genius came up with the idea of puncturing the rubber non return valve disc to lower the forward resistance to flow.
If the bike has the 3 port oil tree then this may be true but the correct method of piping the feed to the rocker gear is after the filter anyway.


No-one expects the Spanish Inquisition................
Bring in the 'Comfy Chair'
Re: Cartridge Filter on A65 [Re: trig] #740845
07/05/18 4:50 pm
07/05/18 4:50 pm
Joined: Nov 2007
Posts: 115
uk
trig Offline OP
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trig  Offline OP
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Joined: Nov 2007
Posts: 115
uk
I have a 66 which has the rocker oil feed at the top of the oil tank. If it lowers the resistance to flow, isn't that a good thing to do? Will I have done any potential harm by puncturing the rubber?

Re: Cartridge Filter on A65 [Re: trig] #740870
07/05/18 8:27 pm
07/05/18 8:27 pm
Joined: Dec 2004
Posts: 9,805
Scotland
kommando Offline
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kommando  Offline
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Joined: Dec 2004
Posts: 9,805
Scotland
No, but don't bother again.

Re: Cartridge Filter on A65 [Re: trig] #740905
07/05/18 11:48 pm
07/05/18 11:48 pm
Joined: Nov 2011
Posts: 213
Nova Scotia, Canada
K
koncretekid Offline
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koncretekid  Offline
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K

Joined: Nov 2011
Posts: 213
Nova Scotia, Canada
I don't believe the Emgo ones have the non-return diaphragm, and neither do the NAPA 1032's which I use. How much pressure does it take to open that flap when it is present?
Tom


Life's uncertain - go fast now!

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