Deep 6 valve stems questions

[71gold]

Guys
I have reviewed the history of posts in various locations for these valves and have some comments & questions
- seems the Napa 90-415 (TR 415) 1-1/4” L .625 rim hole don't work ( my tire installer confirmed no go today ) assume these are the newer long vs the short fat - whatever that means since no-one has provided dimensional differences ?
- One post offered that the Dil TR415 which is shorter fatter dies fit ? Is this true
- one post suggested that the Bobcat valve works ( assume its the 7310CC ) ? can anyone confirm
- one post suggested that Summit offers a Keyers mfg valve 100 7786 that works ? anyone confirm

I would be happy to have the rim opening matched to have incorporate a step that Harvey does of his
But I would rather not pay to ship rims to California - what is the dimensional specs for me to nave a local machinist accomplish this - if I can’t fin a working valve stem
Thanks for assistance
Frank

[gulf908]

Frank - what date are your wheels ?
Dennis

[71gold]

Mine are 1970…

[Scott A]

I have deep 6 from 70. Not modified.
I was able to find the valves that work.
I have a few extra. I’ll go see what they say on them. And try to see if I have a note where I got them.
So at least I know you can find them.

Update:
I have 7.
It looks like the say DILL TR-415


Above: this one I took off the rim after 30 or 40 yrs.


Above: this is the new one from 2022.
This was exact shape as old and has worked flawless.



I would search DILL.






Above: none of these worked from eBay.
(it is possible that the middle one is dill, and worked, but I cannot say if middle was a dill)




Above: the 700 mile S, deep 6 with heart.
Doesn’t seem to be a tube.

[Orange71S]

Frank,
I've dealt with this too and ordered a set from Stoddard: https://www.stoddard.com/sic90041300.html
But, you should probably call and verify those stems will work.
Good luck.
Jay

[cbpiii]

I am using the Milton TR415's on my Deep 6's and 7R's. They seem to work fine. I had at set of the TR425's (don't know the brand) but 4 out of 5 just snapped off at base of the stem.

[Imtwils]

Frank let me share my recent experience.

I have two sets of Fuchs recently restored for my 70 T, a complete set of original 14’s and a set of deep 6’s dated early 1970. From the restorer, I requested that valve stems be installed in all the wheels as I would be running tubeless Pirelli CN36 tires. On the 14 inch wheels, the tires could not be mounted because the stems would fall inside the rim when attempting to air the tire to seat the bead. The set up was absolutely unsafe and thankfully the installer refused.

On the 15’s, the inference stem fit was better but still not as designed. The stem did not pull over the rim lip because the Fuchs aluminum is too thick. Remember that both sets of rims were designed to run tubes and do not have safety humps. I mounted the tires anyway. Less than 50 miles later a stem failed on the rear and the tire suddenly deflated. I was driving 60 mph on a two lane road and I thankfully pulled over without ripping off the rear fender. The tire stayed on the rim but barely and ruined the new CN36 tire.

Both sets of tires now have Michelin tubes at the guidance of Longstone Classic Tire. Although the tires are tubeless ready, the 70 series tire, and only 70, can be installed with tubes according to Pirelli.

With 40 years of Porsche experience, I should have known better. Some on the forums will tell you they have run this setup for years without a problem. Some will also tell you that because of the wheel construction tubes are also almost impossible to mount, my tire installer had no problem at all.

[cbpiii]

Imtwils, how did the stem "fail"?

[911MRP]

Pleased no one was hurt a sudden loss of pressure at 60mph could have had significant consequences both to safety and maybe financially — it’s not as if no one knew certain configurations are advised against by the OEM and its suppliers.

For example some discussion of topic here:
https://www.early911sregistry.org/fo...e-Spacer/page6. Other similar threads exist. Also on sets of tyre companies and other places.

Interested to hear that a fitter declined, perhaps not surprising as why would they take risks to ignore longstanding published information?

There is a lot of information from Porsche itself and the OEM tyre companies who have supplied them that document clearly what they “permit” as safe configurations. Some is four decades old but as far as I know some technical points still stand. Despite this folks have and no doubt will continue to decide for themselves even in the face of this public domain information. Who knows what liabilities exist should there be bad outcomes and or consequences from ignoring technical bulletins etc eg might insurance be invalidated when going against published advice or not declaring it to the motor insurer? I’m no expert but expect Porsche and their OEM tyre suppliers were and are.


Frankly I’m surprised any fitter would expose themselves to liability if their work is in breach of known formal information from important sources — is it worth it for the small amount they get from fitting four new covers.
While I’m no expert I doubt tubes in tubeless covers meets the published technical position as when I enquired of several tyre manufacturers it was not a permitted combo.

I expect some might “take the hump” at this comments but it’s not just the valve seating its other aspects of rim and tyre configurations that need to be considered.

Steve

[71gold]

Guys
Thanks for all info and photos etc….
I did find some Dill & bought 10
Let’s see if they work should have in a few days
Will update