Hall Scott: Breather Valves and VSCC Prescott Long Course 2024

Never one to sit still, Ivan tried another modification on the breathers on the Hall Scott. This was suggested by one of his followers, Roger Jackson and involved him fitting one way valves in the breathers.
This video shows him and John making and fitting them, then it shows Ivan in his new race gear at the VSCC Prescott Long Course Hill Climb.
Plus he gets excited by a very original early Morgan Standard
Thanks to Noel Skeats for some fabulous photographs and to Chris Plowman for the video clip.
Next stop Portimao.

[@carlt570]

"getting old is a bloody nuisance" - priceless 🙂

[@unbalancedcrank]

It’s great to see young chaps like that Morgan owner, preserving the old stuff! That car is safe now.

[@michaelmason5459]

Glad he kept his thumb on right side of starting handel with his fingers. A lesson I learnt to do at 15 years old after 6 months in a plaster cast, 55 years ago.

[@tommyrot7276]

I can't get enough of these videos. Susie, who ever is in the driving seat, you, and only you, know the way to Ivan's heart. What a team, the presentation is first class, well done everyone.

[@daviddjerassi]

Every time you make a video you bring me pure happiness im grinning from ear to ear Thank you all Team Shed Racing for a great Prescott in good weather love the racing overalls Ivan WHAT A BLAST.

[@ChrisPlow]

Fabulous content as ever, I knew very little about vintage sports cars, found the Shed Racing channel, I’m now hooked. It was a pleasure to meet Ivan and Suzie at Prescott, lovely friendly folk with time for everyone, super to see. And great to see my video clip of Ivan burning up the hill. Thanks for the tee shirt and the stickers, already in pride of place in my shed !

[@MARTINA-gc3tq]

Every modern car has a PCV ……the vented pressure recirculates into the intake .

[@neilcurson4505]

A standard 2cv has a non return valve in the oil filter tube with a breather to the air intake. When you consider that the 2cv has piston Comming together then apart it results in significant pressure changes in the crankcase. A common cause of oil leaks on the split crankcase of the 2cv is a failed non return valve. I built a 2cv special in 79 and still drive it as a youngster of a near 83 years! Love your channel, long may you tinker.

[@neilcurson4505]

Oil filler not filter

[@Lemma01]

There's "tinkering", and then theres Ivan and Jon. ❤

[@timjames7869]

Wonderful just to shake your hand and say thank you for my favourite channel! And there’s Suzie over there! 😂😂😂

[@v12mike30]

A non-return valve in the crankcase breather can sometimes cause problems. I don't think they apply to the Hall and Scott, but you should be aware: If the pistons and crankcase make an efficient pump (as they could on a single cylinder or a horizontally opposed two cylinder engine) the crankcase pressure can fall well below atmospheric and the oil pump (on a conventional sump) or scavenge pump (on a dry sump) are pulling against a partial vacuum, reducing their efficiency, potentially to zero. I heard from a first hand source (a very experienced engine designer) who had to diagnose a prototype horizontally opposed twin engine that was continually running its bearings, and it turned out that the vacuum in the sump was completely stopping the oil pump delivery at high RPM. Maybe it also tends to suck oil out from around the crank bearings? A vacuum relief valve should also be fitted to the sump, for safety. The main purpose of a PCV valve on a modern engine is to keep the crankcase pressure within a reasonable range.

[@roberthocking9138]

Only Ivan could include a video of a blue glove madly waving, classic 😂

[@clivebergman1783]

At 16:39 I am literally your follower😁. It was an excellent day's motorsport.

[@matthewhodder3029]

Great idea, well executed as usual. That Morgan is a sweetie.

[@johnhancock4236]

Excellent, as always !

[@martinkavanagh196]

BRILLIANT.

[@blackhouseengineering5386]

Have a look in Dave Vizards A series book. I'm sure he goes into some detail about using a venturi in the exhaust and a check valve to deliberately create negative crankcase pressure.

[@paulbriant4693]

Can I just sit in your workshop!!!

[@davidforeman8347]

Another wonderful entertaining video! Is there more to the story of your new friend with the purple hair!??? Cheers from Alberta Canada!

[@gazzafloss]

The Hall & Scott is definitely a "work in progress" vehicle but development takes more than a few steps Ivan, keep powering on.

[@HanstheTraffer]

Hahahahah. That glove looked like a ghost inside waving surrender.

[@michaelmason5459]

They could charge a pound a time to be slapped by the Hall and Scott for charity.

[@RobertGott-c3f]

Amazing man😮😮😊 great video😊😊

[@modelengineeringadventures]

Ivan lapp the brass disc for a better seal

[@petercousins4767]

Great watch keep up the good work👍👍👍🌞🌞

[@JohnSmith-pl2bk]

A PCV valve with diaphragm was fitted to the breather tube above the oil vapour separator from the crankcase....on a 1969 Wolseley 1300...with the coir filter in the oil filler cap providing the inward air. Always kept the "mayonnaise" out of the valve cover with a one way air flow through the engine.....

[@andyday4535]

My BSA 1946 had a "clack" valve, vented positive pressure, closed under negative crankcase pressure. A similar idea.

[@gregbarnard2465]

As usual a delight to watch and learn. I have some acquaintances from New Zealand running a Bentley in Portugal, you are sure to meet them they are great characters All the best

[@gordonmcgregor6431]

Big old ship engines had clacker valves on the crankcases as well. At some engine speeds it almost sound as though the engine had hay fever sneezing away to themselves

[@shedbythetracks]

Fantastic! I'd never be able to go up the hill in my Model T speedster... When it stops flinging out oil it means I don't have any! Cheers from my shed

[@tomday7309]

Excellent video Ivan. Great driving as well. That new suit looks smashing on you. Must have taken 30 years off your age!

[@shed_racing]

I wish!

[@retromechanicalengineer]

Great result team. Loved the Morgan too.

[@gryfandjane]

Splendid episode, Ivan. Thoroughly enjoyed this one! Best regards from Missouri, USA.

[@NiftyNifty-ws8rj]

Multi cylinder engines normally balance out their crankcase pulses, except for ring blow-by. Single cylinder and boxer twin engines like BMW mc & 2CV have the worst case breathing. IMO reed valves work best, with your design ideal is very light valve flapper and very light spring required. The 70up BMW mc came with breather very similar to your design, it used a light phenolic (micarta) disc, this improved later with reed valve. Possibly another problem with HS is air sucked into engine by incomplete sealing. For example when F1 first discovered the importance of negative crankcase pressure, they used bigger scavenge pumps to achieve it, but then had to reverse the oil seals to prevent atmospheric air from entering crankcase. Keep up the great work!

[@blackhouseengineering5386]

Just a thought Ivan, replace the brass disc and spring with a Reed made from a bit of very thin spring steel. Will be lighter and more responsive taking less crankcase pressure to lift. A lot of old stationary engines used a leather disc as the check valve so you could try that, couldn't be much simpler, just don't cut up your favourite Oxfords😂

[@geoffreypiltz271]

Or you could use a modern two stroke reed valve. They are very sensitive to pressure changes.

[@frogandspanner]

1:35 Every vehicle should have a Marigold to indicate crankcase pressure! The Norton Dominator (my 650SS is a variant) had a timed valve on the end of the camshaft that connects externally (it was he norm to feed back into the oil tank) when pressure would be positive relative to atmosphere.

[@Fintoman]

"Will that fit in the van with that?" Why do women always come up with these awkward questions. My wife does this all the time Women's intuitions, possibly. What would we without them? 😂

[@lanceneuman9528]

As you said Ivan, others will chime in...yep, my '67 MGB has a PCV as original

[@grahamcuthbert783]

Another fantastic video, I know little about the mechanics of an aero engine,but it is so interesting watching your posts. Keep the channel going, Graham.

[@goldcountryruss7035]

I'm concerned that more vacuum in the crankcase will cause the manually applied valve train lube to be quickly sucked into the engine resulting in excessive valve train wear.

[@chuckschultz7028]

You may want to study the crankcase breathers used on Offenhausers. They also suffer from high pressure in the crankcase due to the dimensions of the barrel design.

[@erichlausch9886]

As I can see ivan got a nice romper suit 😁👍👍👍👍👍🛠

[@shed_racing]

yes and on its first outing, got a few traces of oil and mud...

[@andrewbuckley5048]

Evening team, the old 'Petter' single & twin air cooled & water cooled diesel engines used a small non return crankcase breather that used a thin flat rubber washer as the sealing valve 👌👍😉

[@bryduhbikeguy]

Brilliant plan and execution of the idea. Thank you for yet another great video. Glad you had a good day at the track,(No rain) and got to test the new parts set-up.

[@johngibson3837]

Hey up mate nice work and a good video thanks

[@mmmmmmmmmmmmmmm420]

It's Hall-Scott. Not sure why Ivan keeps calling it ' Hall & Scott'.

[@shed_racing]

Habit

[@JD-hh9io]

I find that hard to believe too.

[@grahamrowley-n7k]

Ivan,have you thought of a non metalic breather valve? A metal one would give you a noise when working.

[@JohnSmith-pl2bk]

Rubber?

[@grahamrowley-n7k]

@@JohnSmith-pl2bk Rubber like conveyer belt or similar.

[@stephenhenion8304]

I have the same problems with my sump too.... i blow the gaskets all the time!!!

[@russellwhite7407]

👍🇦🇺

[@sonnymoorehouse1941]

A very Large PCV valve

[@Lemma01]

never had a red flag before? 16:28 "I find that hard to believe..."🤣

[@louisesamchapman6428]

Then you jiggle this bit and tickle that , release the dogs and you're off to the races ! TT FN !

[@makomadeira5799]

What a fantastic and interesting channel ! Love it. Ivan is a star !