The BSA A7-A10 Forum
Technical (Descriptive Topic Titles - Stay on Topic) => A7 & A10 Engine => Topic started by: RoyC on 09.09. 2017 08:53
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I've had an email from SRM pushing pressure release valves.
http://shop.srmclassicbikes.com/product-category/oil-pressure-release-valves Are they worth the money ?
Thanks,
Roy.
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Snap! I got just received the same add, was looking at the Trumpy type and was thinking if they made a pop out type for us we would know we had oil pressure instead of believing we have oil pressure! *eek*
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Fitted one along time ago and happy with it.
One issue with any PRV is getting suitable washers to seal them. I tried fibre and copper and eventually settled on aluminium crush washers as giving the best seal. Very cheap from a number of e bay sellers.
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Snap! I got just received the same add, was looking at the Trumpy type and was thinking if they made a pop out type for us we would know we had oil pressure instead of believing we have oil pressure! *eek*
The BSA one and the pop out one both claim to fit the T120, so would the pop out one also fit the BSA ?
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Fitted one along time ago and happy with it.
Ditto
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Fit a new SRM oil pump and the OPRV
"Worth every pound"
Oil pressure, controle and flow is vital for the BSA engine.
Thank "the lord" we don't have a Triumph oil pump in our BSA motor...
My late farther and I have used the new OPRV since 1995 and new oil pums since they came out from SRM.
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I can second the praise of them. An add that a very clever man in the Danish OC devised a test rig for the PRV's and all SRM ones checked out perfect, which many old original ones didn't.
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I think I jammed one in mine and I haaven't blown it up yet after 10k+miles *doubt*
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Surely its a ball and a spring what can go wrong?
A new ball, a new spring and provided it does not leak why would you spend 50 + quid on one?
I must be missing something somewhere cos I have had the same A10 since 1973 and other than a few new springs and balls on rebuilds I would not even know I had a PRV.
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Surely its a ball and a spring what can go wrong?
A new ball, a new spring and provided it does not leak why would you spend 50 + quid on one?
I may be wrong, but I have a feeling they revised the design and now have a piston and spring (?)... *dunno*
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SRM design has been piston and spring for years and a nice part it is.
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Yes a very well made prv as with most of their products. *smiley4*
ELLIS
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I have SRM PRV and oil pump on my A10
Worth the money in my opinion
S
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I had an interesting conversation where it was highlighted to me that we should not assume the blow off hole in the cases aligns to the PRV vent (we should check they are aligned so that the blow off can do so) AND that it is worth sealing the several threads on end of the PRV so that we don't lose any oil pressure at idle.
Just something to consider.
I do run plunger rather than ball type valves on all my A10's
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I like the stainless steel construction as well as the revised design. Price is (Cough cough) a little steep IMHO but nature of the beast catering to small batch manufacturing.
I personally would NOT opt for the little willy version like early Triumphs had because its pretty obvious they can have challenges long term with leakage with a moving willy going in and out like that with fluctuations of pressure.
Only a plus if you have phallic exhibition tendencies.
However its is worth noting Triumph stopped using that design for similar reasons.
Better choice is a liquid filled Oil pressure gauge mounted in your choice of location. You can source vintage style gauge faces if you like. I personally believe fitting a gauge makes you a better rider, owner and caretaker of a vintage bike. (Dont flog the beast with cold oil!)
I also often make my own LED idiot lights for pressure warnings.
Despite the improved design, even Triumph had issues with ther PRV and circa 66-67 there was a factory service bulletin for testing the PRV and what to watch out for. But cleaning and service usually does the trick. Norton INOA tech guide has also suggestions for the Norton versions and there is a procedure for testing and spring pressure. I still have 3-4 new replacement springs in inventory for Nortons and every rebuild gets a good servicing of the PRV,,
They tend to be an item nobody looks at or thinks about until there is a problem