macaroni 17 1 Cars Posted July 18, 2006 Hi. having recently fitted a Vernier pulley to my car, I wanted it set up properly, but having little luck with a RR session I thought I would have a fiddle myself. With 0 degrees in the middle of the vernier, 5 degrees to the right of 0, the car feels quite aggressive, jerky on/off the throttle, 5 degrees to the left of 0, the engine feels much smoother and pulls better from low down, although because it is smoother, subjectively it doesn't feel as powerful. Whch way does what? After each cam adjustment, should I re-adjust the ignition timing? Any help gratefully received. Antony Share this post Link to post Share on other sites
christopher 5 1 Cars Posted July 18, 2006 (edited) Hi.having recently fitted a Vernier pulley to my car, I wanted it set up properly, but having little luck with a RR session I thought I would have a fiddle myself. With 0 degrees in the middle of the vernier, 5 degrees to the right of 0, the car feels quite aggressive, jerky on/off the throttle, 5 degrees to the left of 0, the engine feels much smoother and pulls better from low down, although because it is smoother, subjectively it doesn't feel as powerful. Whch way does what? After each cam adjustment, should I re-adjust the ignition timing? Any help gratefully received. Antony You should do this with extreme caution. You are varying the cam piston distance, and hence when the valve lifts off the seat in the combustion cycle. What cam are you using?? Do you have the specs for it? i.e lift at TDC for the correct installation?. You need a dial gauge to set this to the spec decided by the manufacturer. Contrary to popular belief carbs can be set up without a RR if you get someone who knows what they are doing. Edited July 18, 2006 by christopher Share this post Link to post Share on other sites
macaroni 17 1 Cars Posted July 18, 2006 Thanks for the warning. I am using a Catcams 279 degree cam (4901103). It was setup with a dial gauge, but not to any specs, just by the RR operators judgement. It was set to 3.429mm @ TDC. The cam specs are 3.05mm at TDC. How much difference would that make? OK, so I am now way off the cam specs, if I put it back to the 3.429mm @ TDC, which way should I go to get to 3.05? More away from 0 on the vernier or towards 0? Or am I barking up the wrong tree. I have got the carb working quite nicely now, by a system of trial and error. When I had the MOT done recently, the guy said the emissions were so low it would have passed the CAT test! Share this post Link to post Share on other sites
Sandy 191 Posted July 18, 2006 If it's set at 3.429mm vs spec of 3.05mm, then it's advanced at the moment. So you need to turn the cam anti-clockwise (from the pulley end) to take it back to spec 3.05mm. It's quite possible that the 0 position on the pulley isn't actually 0 degrees of the cam, due to machining tolerance. Share this post Link to post Share on other sites
macaroni 17 1 Cars Posted July 18, 2006 Thanks for the reply. At the moment it is set way too retarded, but I can get back to roughly what the RR set it to and work back from there. I am trying to find a local garage with a dial gauge to get it set to spec. Cheers. Share this post Link to post Share on other sites
christopher 5 1 Cars Posted July 19, 2006 Thanks for the reply. At the moment it is set way too retarded, but I can get back to roughly what the RR set it to and work back from there. I am trying to find a local garage with a dial gauge to get it set to spec. Cheers. Its not hard to do yourself. All you need is a dial gauge, a magnetic stand and a metal plate. For the price you get someone to set it up you can almost buy this and use it again... for example : Exmaple magnetic stand and gauge I have set mine to the catcam spec and not changed it since. Its possible there may some gain/loss playing with this on a RR. Personally otherwise I would not bother Share this post Link to post Share on other sites
macaroni 17 1 Cars Posted July 19, 2006 I had thought of that and that is a good price. How do you do it? Set the flywheel to TDC, then rotate the camshaft in its pulley until the lift of each inlet/exhaust valve, that should be closed is 3.05mm? Matt at QEP can set it up for an hours labour, which is much cheaper than anywhere else I have found and I trust him. Never using a Rolling Road again. I might sell my car now anyway... Share this post Link to post Share on other sites
christopher 5 1 Cars Posted July 19, 2006 (edited) I had thought of that and that is a good price.How do you do it? Set the flywheel to TDC, then rotate the camshaft in its pulley until the lift of each inlet/exhaust valve, that should be closed is 3.05mm? Matt at QEP can set it up for an hours labour, which is much cheaper than anywhere else I have found and I trust him. Never using a Rolling Road again. I might sell my car now anyway... I don't think its that hard....but best go to Matt... he has doen it a zillion times Edited July 19, 2006 by christopher Share this post Link to post Share on other sites
macaroni 17 1 Cars Posted July 19, 2006 I think I will, wish I had gone to him instead of the stupid RR. Share this post Link to post Share on other sites
