Author Topic: New pressure release valve  (Read 1476 times)

Offline a10gf

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Online bsa-bill

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Re: New pressure release valve
« Reply #1 on: 16.03. 2009 10:35 »
I have one of these fitted to my A10 project, I use the later type with piston replaceing the ball.
I went this route after reading an article from someone we all know

http://www.a7a10.net/BSA/oilrelief.htm

All the best - Bill
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Online Triton Thrasher

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Re: New pressure release valve
« Reply #2 on: 16.03. 2009 13:18 »
I use the later type with piston replacing the ball.

Some people call it the Triumph type.

Offline Dynamo Regulators Mike

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Re: New pressure release valve
« Reply #3 on: 16.03. 2009 14:12 »
Surely only the Triumph type has the tit on it. ;)
I have one of these on my A10 as well. They are supplied by SRM with two washers which preload the spring. With both washers in plase cold oil pressure was 72 psi, with one removed 65 psi and with none fitted 58 psi. SRM did not menton it when I bought mine, but for the A10 the lowest pressure is nearest the book figure of 50/60 psi.
Perhaps the  only difference with overly high pressure in practice is more chance of leaks around feed side whilst the oil is cold, and a bit more load on the pump gears which is probably insignificant.
Mike
Mike Hutchings
A10, B50, T800; 1,2,3 (& DVR2)
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Offline dpaddock

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Re: New pressure release valve
« Reply #4 on: 21.03. 2009 04:23 »
Note, however, that this valve is located in the passage which feeds the camshaft and followers, and any paucity of lubricant in that region can get very expensive. One wag refers to the A7-A10 system as "a part time cam oiler". Thus, opt for a pressure on the low side of the specification.
     David
David
'57 Spitfire