Anglefire Posted February 10, 2018 Report Share Posted February 10, 2018 Whilst it is raining, I thought I would draw up a cam timing disc that should (Not tried it yet!) fit over the crank pulley of a Spitfire to enable the cam timing to be checked - obviously to fit it, a hole will need to be cut - I've drawn a line 4" diameter as a cutting line - but it is not critical - it should print to form a 6" circle (When cut out!) which I think will fit on the pulley about right. Cam Timing.pdf 1 Link to comment Share on other sites More sharing options...
Algy Posted February 10, 2018 Report Share Posted February 10, 2018 I have made several in the past, normally printing them then laminating them, before cutting them out. I normally use one on the crank and one on the camshaft and a couple of pieces of wire bolted on as pointers. Link to comment Share on other sites More sharing options...
Anglefire Posted February 10, 2018 Author Report Share Posted February 10, 2018 I got one with my new cam - but its just a bit bigger than the pulley - and I (for some totally unknown reason!!) didn't want to cut it. So I thought I'd draw one in autocad (well it's actually nanoCad5 as its 100% free!) as its easy to create the divisions - though the scale was a challenge in layout view, so just exported it in model view Never thought of the cam having one too - though I'm hoping that cam timing isn't my issue! Link to comment Share on other sites More sharing options...
Algy Posted February 10, 2018 Report Share Posted February 10, 2018 My cheat rather than draw my one up was to scan a production timing protractor and then scale it as required. I always time a cam even if it has timing marks but then I am ex Lotus and worked on racing cars during my mechanical / engineering apprenticeship before going over to design. Found that with Ford engines I had to make up off set keys to get the cam timing spot on. Link to comment Share on other sites More sharing options...
Pete Lewis Posted February 10, 2018 Report Share Posted February 10, 2018 on the cam I just use a card disc and dial indicator on top of the pushrod Turn to get a fixed amount of lift in clock and anti clock rotation and mark the disc The tdc of the cam lobe is mid point of the two marks Pete Link to comment Share on other sites More sharing options...
Anglefire Posted February 10, 2018 Author Report Share Posted February 10, 2018 Thanks Pete. That’s how I did it before. I’m pretty sure it’s right but as it’s raining might as well check it again. Link to comment Share on other sites More sharing options...
Pete Lewis Posted February 10, 2018 Report Share Posted February 10, 2018 Yes raining , Ray and I just been to Potterbar to start 3 cars Cold wet and ...failed, one needs lift pump one has spark but not at plugs , third not atempted but fuel and spark but choke cable not opening choke Give it all a good try but weather got the better of any sain progress Brrr Grrr Another day for the traveling duo Pete Link to comment Share on other sites More sharing options...
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