Anthony Posted January 3, 2011 Share Posted January 3, 2011 I've got two master cylinders in my garageOne says Girling 75 in the castingThe other says Girling 70Which ones are used on which cars?Thanks Link to comment Share on other sites More sharing options...
Nick Jones Posted January 3, 2011 Share Posted January 3, 2011 Either may be fitted to Vitesse 2L or GT6. 0.7 will give a slightly longer pedal feel and slightly less effort. I think 0.7 is the factory "standard" but have seen both fitted.Nick Link to comment Share on other sites More sharing options...
Clive Posted January 3, 2011 Share Posted January 3, 2011 I have a feeling the 0.75 was used with cars that had a factory servo? only a feeling mind. Link to comment Share on other sites More sharing options...
JohnD Posted January 3, 2011 Share Posted January 3, 2011 ant,if you are really, really into originality (see your thread on oil filler caps!), you need John Thomason's book, a "Guide to Orginality" for Spitfires and GT6s. John says it was the 0.7inJohn Link to comment Share on other sites More sharing options...
Anthony Posted January 3, 2011 Author Share Posted January 3, 2011 Thanks JohnBelieve it or not I'm not all that taken by 100% originalityI will be doing some things to my car which weren't standard, but, they way I see it, if it's not something I'm modifying then I might as well keep those bits originalI've already spent far too much on this car to start compromising on it now Link to comment Share on other sites More sharing options...
Anthony Posted January 9, 2011 Author Share Posted January 9, 2011 Right then,Clutch master cylinder this time......One of them says CC2, whilst the other says BS3Does this mean anything in particular, and if so, which should I fit? Link to comment Share on other sites More sharing options...
Anthony Posted January 9, 2011 Author Share Posted January 9, 2011 How should I go about cleaning and polishing up the reservoirs?Metal polish by hand? Or some kind of machine polishing? Link to comment Share on other sites More sharing options...
rotoflex Posted January 9, 2011 Share Posted January 9, 2011 Originally, they didn't have much of a polish or shine, they were just sort of clean and glossy.Some folks do like to polish them, though. It depends on your bling design/tolerances/personal likes.When you clean aluminum parts with close tolerances like the carbs, you need to use something caustic, not acidic. Some folks think that vinegar is a mild enough acid (acetic acid) to use to speed cleaning of the carbs, but vinegar will etch and remove small features. I have seen vinegar remove the finer detail from aluminum molds for ornamental pieces. I would never use vinegar on my Strombergs especially due to the problems with maintenance of the tight tolerances and deterioration of the small features in the starter box assemblies.Something petroleum based like gasoline, kerosene, etc. is OK, caustic stuff like solutions incorporating lye (like drain and oven cleaners) also work well. Don't use something caustic on the plastic/rubber pieces, though. Cleaning all the nooks, crannies, and passages in carbs is a sort of slow process that can be aggravating for the impatient, especially if it's been a while since they were cleaned, but it's one to keep at a lackadaisical pace. Soak, brush with a stiff organic brush (lye & petroleum solutions will dissolve nylon, etc., so you want hemp, pig bristle, etc. brushes, and use little pieces of wood like toothpicks for poking/scraping so that the aluminum isn't damaged), go as far as it will, dump the pieces back in to soak, take it up again tomorrow, repeat. Do one carb at a time, because having the other carb still assembled is invaluable for seeing how to put one back together again. Link to comment Share on other sites More sharing options...
JohnD Posted January 10, 2011 Share Posted January 10, 2011 rotoflex wrote:When you clean aluminum parts with close tolerances like the carbs, you need to use something caustic, not acidic. You quite sure about that, rotoflex?See: http://www.youtube.com/watch?v=Y7FmrOatEEALong list of ways to clean aluminium here: http://www.team.net/sol/tech/clean_al.htmlThe only method I know of apart from those mentioned is ultrasonics.John Link to comment Share on other sites More sharing options...
Anthony Posted January 10, 2011 Author Share Posted January 10, 2011 I've used caustic soda on some aluminium at work before....oh no!!What do people do once the reservoirs are cleaned?Has anyone sprayed the with clear coat, or do you just leave them bare? Link to comment Share on other sites More sharing options...
rotoflex Posted January 10, 2011 Share Posted January 10, 2011 JohnD wrote:You quite sure about that, rotoflex?See: http://www.youtube.com/watch?v=Y7FmrOatEEAJohnNot now! EZ-Off Oven Cleaner is now off my list of cleaners for aluminum things!Although I think his caustic soda is a higher concentration! Link to comment Share on other sites More sharing options...
Anthony Posted January 10, 2011 Author Share Posted January 10, 2011 Yep.....caustic soda will eat your skinIf you put cold water in a metal bucket, then add caustic soda, the bucket will become extremely hot as the caustic soda reactsNasty stuff Link to comment Share on other sites More sharing options...
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