If this is your first visit, be sure to
check out the FAQ by clicking the
link above. You may have to register
before you can post: click the register link above to proceed. Registration to this Forum is open to Members of The Stag Owners Club (SOC) and Affiliated Overseas Clubs. Non members with an interest in the Triumph Stag may avail of a 30 day trial membership of the Forum. Details in the FAQ section. Registration is not necessary if you just wish to view the forums. To start viewing messages,
select the forum that you want to visit from the selection below.
The purpose of the one way valve is also to ensure the brake servo always has enough vacuum to operate.
so it’s not a great idea to leave the one way valve out, unless the port is blocked off.
Another reason may be to maintain vacuum at the air-intake actuator. Without the non-return valve, then, when you put your foot down and the manifold pressure rises, then the actuator "drive" would be lost. Another theory into the pot! The brake servo reservoir has a similar NRV.
I am a believer in this mechanism as it does speed the warm up time, particularly at this time of year. So if you experience cold winters, it is well worth getting going (IMHO).Also, if you like to run your car at the optimum mixture, then it saves you re-adjusting the mixture between winter and summer.
Last edited by MikeParker; 13 January 2023, 19:14.
Spent a couple of hours in the shed yesterday re-visiting three used examples of the non-return valve in the pedestal. Two of them were blocked with accumulated debris, but after dismantling were easily cleared with pipe cleaners and smear of metal polish. The fibre washer WF510 was originally 7/16 inch ID x 11/16 inch OD, but 10 mm ID x 21 mm OD works well (OD not critical). This is effectively captive once installed, a 7/16 inch socket and soft hammer work well as a means of keeping it square while pushing it over the threads. Pub quiz question - is this the smallest spring you'll find on a Triumph Stag?
I do know that if you don't block it completely whilst tuning the carbs (you need the air filter off so you can fit an airflow meter) then it really mucks things up. No, don't ask me how I know.
Comment