Kenrow Posted July 26, 2023 Report Share Posted July 26, 2023 There is a lively discussion on the TR Experience Forum about whether the Triumph Cam Followers were flat or radiused (https://www.triumphexp.com/forum/tr5-and-tr250-forum.25/flat-lifters.1978246/) . I did find this (https://www.tr-register.co.uk/forums/index.php?/topic/69794-cam-followers-best-ones/) but was wondering if anyone had more insight? Quote Link to post Share on other sites
RogerH Posted July 26, 2023 Report Share Posted July 26, 2023 Hi Ken, I believe they are flat. That is partly why there is always a debate about ZDDP in engine oil Rpger Quote Link to post Share on other sites
hoffman900 Posted July 30, 2023 Report Share Posted July 30, 2023 (edited) “Lively” And unnecessarily so! Edited July 30, 2023 by hoffman900 Quote Link to post Share on other sites
BlueTR3A-5EKT Posted July 30, 2023 Report Share Posted July 30, 2023 On 7/26/2023 at 8:52 PM, Kenrow said: There is a lively discussion on the TR Experience Forum about whether the Triumph Cam Followers were flat or radiused (https://www.triumphexp.com/forum/tr5-and-tr250-forum.25/flat-lifters.1978246/) . I did find this (https://www.tr-register.co.uk/forums/index.php?/topic/69794-cam-followers-best-ones/) but was wondering if anyone had more insight? Coo that is a fun discussion. pull pin, throw grenade….. Has no one asked if Triumph may have made the cam follower bores not perpendicular to the cam axis? The need for slope ground cams, offset bore to lobes and cone ended tappets/followers would be thrown into complete disarray. On a lighter note. I had always thought the followers on the TR2-4 Triumph supplied were flat ended with a chamfered edge, and the cam lobes ground parallel to the cam axis, and the lobe is offset to the follower bore. I, like many, do as the cam supplier recommends, and fit their specified followers. You can then throw them back should there be an issue Get in your TARDIS chaps and pop back to check. What is found to be the “wasp’s nipples” today may have been beyond the pricing budget and engineering technology of Triumph 50 years ago as they built a mass produced engine to go in a car for the masses. . Quote Link to post Share on other sites
Kenrow Posted August 8, 2023 Author Report Share Posted August 8, 2023 On 7/30/2023 at 12:48 PM, BlueTR3A-5EKT said: Has no one asked if Triumph may have made the cam follower bores not perpendicular to the cam axis? Is this so? If yes it is interesting bit of information. As noted, the whole discussion is mute if you use the same manufacture for the cam and followers. Quote Link to post Share on other sites
BlueTR3A-5EKT Posted August 8, 2023 Report Share Posted August 8, 2023 15 minutes ago, Kenrow said: Is this so? If yes it is interesting bit of information. As noted, the whole discussion is mute if you use the same manufacture for the cam and followers. Agreed. Use cam and followers from the same maker/supplier. Quote Link to post Share on other sites
hoffman900 Posted August 29, 2023 Report Share Posted August 29, 2023 On 8/8/2023 at 7:43 AM, Kenrow said: Is this so? If yes it is interesting bit of information. As noted, the whole discussion is mute if you use the same manufacture for the cam and followers. It would suppose to be, but due to manufacturing machining errors, likely isn’t. You can measure this when building. Find TDC for each cylinder (will show crank twist), and then record cam timing for each cylinder. You’ll likely find variance beyond measurement error. Quote Link to post Share on other sites
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