Changes to the exit tip:  

     On the outside, the simple 3/8" hex is replaced with a smaller 5/16" hex that has a smooth taper down to the nozzle exit.  The idea of the transition is to smooth flow of the entrained.  Herb de la Porte has observed eddy currents around standard jets at the nozzle and this seems like a way to help rectify that.  He also has a set of old jets he found somewhere that have a similar design.  He lent me one I used to copy the head.


     On the inside, I added a 5 degree taper at the exit of the inner hole to create a diverging nozzle.  Since the flow is sonic and therefore choked, the diverging nozzle should allow further acceleration of the fuel flow and hopefully more air entrainment.  I used about a 2:1 area ratio for the diverging nozzle assuming a #56 jet.  With smaller jets, it will be a expanded a little more.  I then added a 1/8" radius right at the exit after the taper to help the "pricker" find the hole, but hopefully these don't need to be pricked very often due to the changes in the backside of the jet 

Backside:

   Even though I use the multi port jets from Vintage Steam, I have noticed when the rearward centre hole clogs, the flow goes way down even though there are 12 other holes for it to go through.  A simple prick usually opens things right back up and I have never seen the radial holes clog when I remove the jets.  I took some measurements and the diameter of the holy section of the current multiport jets is 0.196" and the drill for a 1/4-28 hole is 0.213 so there is only 0.0085" radial clearance for fuel flow.  That gives about 0.0055 sq inch of area which is almost 4 times my # 57 jet area, (# 57 = 0.0015 sq inch) but empirically it doesn't flow when the back hole gets plugged.  Maybe there is a boundary layer issue with such small clearances, or maybe carbon dust plugs up the circumference.

     To help, I made several changes to the backside of the jet.  First I reduced the minor diameter to 0.175".  This should allow much more flow to get to the radial holes perpendicular to the main flow axis.  The other big change was the addition of 6 holes on the tapered surface around the main rear hole.  These holes are perpendicular to the chamfer pass through the axial hole and also open to the cylindrical surface.  I would think these holes eliminate the need for the radial holes, but I started thinking they all converge at a single point which was a potential area for a blockage so I added a dozen radial holes as well.   The back of this jet is now Swiss cheese...

It looks like a pretty tricky part to make, but my first preliminary quote came back at $10.06 each in a quantity of 100.  Before I get deeper into the quoting process, I wanted to get feedback / see if you guys have any design change ideas.  Also if anyone is interested in splitting up the order I can keep you posted as I work through the quote process.  

I've made a couple of changes based on some great feedback, which I really appreciate. I will wait a couple more days for further feedback then send them out for production:

1) I've increased the length of the bullet shaped outer tip per feedback from Howard.

2) Changed the spacing of the holes perpendicular to the chamber at the fuel inlet, such that they all do not intersect at the same point giving a potential clog point.  They are now in 2 arrays of 3 giving 2 intersection points.

3) All holes are now #66 which was the smallest size anyone I know uses.  They can easily be drilled out to any larger size needed.

Dear Basil,
The committee of the steam Car Club of Great Britain all agree that your presence at any of its events as an entrant or guest would not be well received by a majority of its members. At this moment in time we are not willing to compromise on this decision and it is not open for debate.

Regards Harold Bell – chairman of the Steam Car Club of Great Britain.

The committee of the club continues to carry a 10 year vendetta against Basil Craske. Hiding behind the members.
Most if not all members are disgusted by the committee members who behave in such a way, not all committee members truly agree.

We regret to report that Brent Campbell, one of the most prominent members of the Steam Car Community, passed away on the 24th October, after a long illness. Brent had been around Stanleys since the early 1950's, when he rode in his grandfather George Monreau's (who had worked for the Stanley Factory) 1913 Model 65. A keen driver, Brent believed in using his car's rather than just displaying them; his first Stanley clocked more than 35,000 miles in the 13 years of his ownership. Indeed, in his Stanley model 85 he clocked 424 miles in one day, and regularly took part in the Trans Continental  and Red Rock Tours. 

He was an absolute authority on Stanleys, and was a great help to many Stanley Owners, always offering help, as well as historical information. Indeed, his contribution to the Stanley Steamer Book, written by Kit Foster,and produced by the Stanley Museum, was invaluable. 

Brent was not a person who believed in the brake pedal. In 2006, the Buick Hot Rod he owned crashed when a rear tyre blew, throwing the car firstly into the central reservation, then back across the highway to the nearside followed by five somersaults, destroying the car. Brent suffered multiple injuries in addition to three vertebrae in his spine needing to be frozen together. After a long rehabilitation period, Brent was back driving his Stanleys. 

Brent had a great collection of steamers over the years, including a Stanley CX (sadly lost at the bottom of the Atlantic after taking part in the centenary of the London to Brighton Veteran Car Run, when the container ship broke in two), a Stanley Model K, a Stanley Model 74, a Stanley 731, Stanley 82 and Stanley 85. But perhaps the cars he is known best for are the two Raymond Stanley Specials he owned, Effie, a 1911 30HP Roadster, and a 1912 30HP Roadster, the latter a painstaking multi year recreation by Brent.

With Brent, alot of Stanley and Steam Car information passes. He will be sadly missed. 

Images in slideshow above courtesy of Wumf Tuxworth.