Hi Howard: I see you have a lot of car experience. Certainly more than I have had. I only had sports cars for fun. But you might want to check out the 1952 Jag Roadster to see metric on a British car. I bought mine used, I wouldn't be old enough to buy it new. But it did have metric on it. I really dug into it. I even did a valve job and discovered that I had to replace the shims in the exact same place they came from. Not being a mechanic but just a kid having fun, I had to follow the manual and advice from mechanic friends. I can say for sure that MY Jag had some metric hardware on it along with the Witworth and English. Whether or not the car was manufactured that way I cannot say because I bought it used and restored it. And, I did learn something in the long run. ----- Original Message ----- From: "Howard Winter" To: "Microcontroller discussion list - Public." Sent: Thursday, June 21, 2007 8:12 AM Subject: Re: [OT] Units rant > Rich, > > On Wed, 20 Jun 2007 00:20:19 -0400, Rich wrote: > >> I once had a jaguar that had English, Metric and Wentworth standards. It >> was a (joy) maintaining it. I don't hear much about Wentworth these >> days. >> The Jag was a classic that I restored, 1952 Silverton roadster. It took >> 16 >> quarts of oil and had 16 inch tires. Do you know if Wentworth is still >> around? > > As has already been said, it's "Whitworth", but I'd be *really* surprised > if it had anything Metric on it. I started work on cars when I was about > 10, > and I didn't encounter anything Metric on a British car before those made > in about 1970. Before that threads were UNF and UNC (unified coarse and > fine) and BSW (British Standard Whitworth). UNx nuts and bolts used "AF" > (Across Flats) spanners, while BSW used Whitworth spanners, which I > believe were sized avvording to the diameter of the thread, so a 1/2" AF > open-ended spanner was 0.5" across its mouth, whereas a 1/2"W spanner > was much larger. > > I believe Metric spanners are also measured across the flats, so a 13mm > spanner will work on a 1/2" UNx bolt if it's not done up too tightly! :-) > > Cheers, > > > > Howard Winter > St.Albans, England > > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist