Stag Breather Tee - Size Please

[rlubikey]

For some time now I've a cunning plan for my PI to give an automagic idle speed control - so no need for a fast idle cable on the choke. But one implementation I have in mind needs a Tee piece on one of the two PI manifold balance pipes.

While browsing Fleabay, I came across part number 152341 - Stag Tee Piece Breather - which fits on the back of the air box and seems to feed to each inlet manifold - or possibly each carb.

Would some kind soul happen to know - or be able to measure - what size pipe it's meant to fit please?

Thanks, and happy new year everyone, Richard

[Firefly]

 

                    Stag Tee  is  7.7mm I/D   &   12mm O/D.

[rlubikey]

Thank you Firefly. Sadly too small for the balance pipes which I think are 1/2"

Anyone know of a 1/2" rubber tee?

Cheers, Richard

[Peter Truman]

Have you looked at the plastic/nylon drip irrigation tees and elbows that is what we use here for the breather pipes

[rlubikey]

Thanks for the suggestion Pete. Yes, I've rummaged endlessly through the parts bins at work but, because the PI manifolds are so close together, there's little space for a tee. Especially when you consider it also needs a little section of hose each end to connect the balance pipes. Besides, I was also hoping for the central arm to go downwards so that the pipe to the idle valve was largely hidden until pointed out.

Cheers, Richard

[Gary Flinn]

I'm not sure if you have enough room for this, but could you fit this 'T' piece meant for the breather pipes (1/2" ID) on a late Spitfire.

You might just have enough room to fit it with 2 shorts sections of 1/2" ID Rubber Pipe

Regards

Gary

[rlubikey]

Same problem Gary. The central section is too wide for the narrow gap. I'd like a single moulded rubber tee.

My alternative plan is a take-off on the threaded hole on one of the manifolds. I already have a 1/4" take-off and tube to a manual valve under the dash which proves the concept. This is fine for idle, but not enough for starting - a little throttle is required. A 3/8" or 1/2" would easily suffice. But as you can imagine, on the final implementation inquisitive eyes would follow the tube looking for the brake booster, only to find an idle valve!

Cheers, Richard

[Gary Flinn]

4 minutes ago, rlubikey said:

Same problem Gary. The central section is too wide for the narrow gap. I'd like a single moulded rubber tee.

My alternative plan is a take-off on the threaded hole on one of the manifolds. I already have a 1/4" take-off and tube to a manual valve under the dash which proves the concept. This is fine for idle, but not enough for starting - a little throttle is required. A 3/8" or 1/2" would easily suffice. But as you can imagine, on the final implementation inquisitive eyes would follow the tube looking for the brake booster, only to find an idle valve!

Cheers, Richard

I wondered if it may be too long?

You can get rubber Tee pieces for Pond Water Systems but I don't think they go as small as 1/2" ID

Regards

Gary

 

[Gary Flinn]

Could this be made to fit?

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwiQuMed-r6DAxW7gv0HHVVVD2YQFnoECBQQAQ&url=https%3A%2F%2Ftameson.co.uk%2Fproducts%2Ff278k-1-2inch-tee-push-in-fitting-pbt-nbr&usg=AOvVaw2ARk_ZowLLKswte48KD3Wb&opi=89978449

Gary

[rlubikey]

Thanks for the suggestion. I'd rather not remove/disturb a manifold to fit a John Guest style tee, whereas a rubber part can be twisted on.