I received a copy of an SU information bulletin from Earl Kagna during my research into whether or not identification tags were fitted to Austin Healey 100 carburettors. Our local SU guru Blain Hughes was good enough to send me pictures of what he had in the way of ID tags from SUs with the type of float chamber lid held on by one center cap nut.
These tags are a different shape from the type used on SU carburettors having float chamber lids held on by 3 screws which look like this.
Anyway, back to Earl’s SU bulletin.
On the third page of the bulletin one item description caught my eye…#48. This is the large washer or gasket fitted between the float chamber lid and the float chamber itself.
It’s called an “Oakenstrong washer-lid”. What is an Oakenstrong washer?? I’ve been around old British cars and machinery all my life and I have never heard of an Oakenstrong anything.
Does anyone know where that name comes from?
BTW the jury is still out on whether or not Austin Healey 100s had carburettor tags but, as no one has been able to come up with one or even a photo of one, it seems fairly likely that they were not fitted.
It is possible that they were not used because of the extra space required under the float chamber cap nut for the support strut that is used between the carburettors and the inlet manifold as can be seen in this photo of #174’s carburettors.Interestingly the cap nut used on the H6 (100M) Item No. N1 is noted as being “long”. Perhaps it was lengthened to accommodate the tags on the 100M, if they had them.