Blower Manifold - Pop Off Valve

Jayde Deverson · Posted: Thu Apr 25, 2024 3:51 am Post subject: Blower Manifold - Pop Off Valve

Hi all, I'm currently designing the blower output manifold for fitment to my special. I am attempting to copy the visual styling of the original WO Bentley Blowers.

One thing I am stuck on is the detailing of the blow-off-valve (pop-off-valve) (backfire-valve), as fitted in three places on the original; 1 on the output manifold on the blower and 2 on the engine intake manifold.

Can anyone help with drawings, photos, sketches, advice of where to look for one, buy one, copy one? Any clues would be greatly appreciated.

John Murch · Posted: Sun Apr 28, 2024 2:56 pm Post subject:

You could ask Ewen Getley at Kingsbury Racing at Bicester Heritage. A google should find his contact details.
He has recently built up a blown 4.5 so will either have made valves or know where to buy one.

Stephen Blakey · Posted: Mon Apr 29, 2024 3:40 pm Post subject:

Hi Jayde,
You're lucky to live in a country where building vintage-style specials is still allowed (if not, well done for doing it anyway!).
You may care to email former chairman Ron Warmington who is a helpful chap, and has a '29 blower rep. He may be able to help you with photographs and measurements.
It's also worth contacting Wroxton which has a lot of blueprints which were rescued from the service centre after the takeover by RR. Of course the original drawings were burnt by their new owners.
Stephen

Jayde Deverson · Posted: Mon May 06, 2024 10:57 am Post subject:

Thanks John and Stephen, I appreciate the leads.
Very interested your comment about not being able to build specials anymore? How very dissapointing.