JohnRoberts Posted June 16, 2022 Report Share Posted June 16, 2022 Hi Guys I am looking for advise on best way to time a CP camshaft. 35 degrees BTDC. is that the moment when the inlet valve starts move ? Regards JohnR Quote Link to post Share on other sites
FatJon Posted June 16, 2022 Report Share Posted June 16, 2022 Yes and no. It takes no account of valve clearance so you can be a way out. The best measurement is peak lift. No idea what that figure is for the TR6 and I bet it depends a lot on the cam, there were many. Quote Link to post Share on other sites
Kenrow Posted June 16, 2022 Report Share Posted June 16, 2022 (edited) CP cam: 150BHP No. 307689 (identified by 2 rings on the front of the cam just by the drive sprocket). Timing for this cam is 36 65 65 36. CR cam: 125BHP No. 311399 (identified by 3 rings at the front). Timing 18 58 58 18. If a non-stock cam you need the manufacturers info. Check out page 95 here: http://www.triumphexperience.com/article/triumph/Tuning_Standard_Triumphs_Vizard.pdf This too: https://www.youtube.com/watch?v=wKoWwOWMpt4 Edited June 16, 2022 by Kenrow Quote Link to post Share on other sites
john.r.davies Posted June 16, 2022 Report Share Posted June 16, 2022 (edited) All Triumph camshafts (save an occasional extreme specialised one) are 'symmetrical'. This means you can use "Equal Lift on Overlap" to time the cam, with no need to use protractors or worry about degrees. Please see my article about ELoO here: https://sideways-technologies.co.uk/forums/index.php?/topic/7770-equal-lift-on-overlap-the-other-cam-timing-method/#comment-102165 But since writing that, which demands the use of dial gauges, I've discovered a variant of the method, which is even simpler. Please see: https://sideways-technologies.co.uk/forums/index.php?/topic/9639-a-new-method-of-cam-timing/#comment-134275 Good luck! I don 't think you'll need it! John Edited June 16, 2022 by john.r.davies Quote Link to post Share on other sites
Andy Moltu Posted June 16, 2022 Report Share Posted June 16, 2022 In some ways it's easier with non-standard cams as the suppliers tends to specify a timing figure of say No1 inlet max lift at 105 to 110 degrees after TDS (a few degrees either way depending on the individual cam) This makes timing a doddle - just move the crank to the specified number of degrees ATDC, set no1 inlet to max lift attach the chain and bolt up the sprockets. Does anyone know the figures for the CR and the CP cams? Quote Link to post Share on other sites
BlueTR3A-5EKT Posted June 16, 2022 Report Share Posted June 16, 2022 http://www.hottr6.com/triumph/tr6cams.html does this help? 105 for CP. 110 for CR Quote Link to post Share on other sites
JohnRoberts Posted June 16, 2022 Author Report Share Posted June 16, 2022 Hi Guys Thanks for the replies. I tried setting timing inlet centre of full lift at 105 , must made an error somewhere, because when trying to run it inlet valve was about 20 retarded. [ 15 BTDC ] Have after many attempts with dial gauge on top of the valve , not the rocker. Now starts to open at 35 BTDC closes at 65 ABDC. Now runs well. Also loaded new ECU file. Regards JohnR Quote Link to post Share on other sites
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