OYIBO Posted May 24, 2017 Report Share Posted May 24, 2017 Hi I have a TR6 fitted with a Racetorations RCT 777 Fast Road camshaft, could anyone confirm the tappet clearance I should use ? Regards Mick Jones Quote Link to post Share on other sites
Guest ntc Posted May 24, 2017 Report Share Posted May 24, 2017 12/14 Quote Link to post Share on other sites
Graham Posted May 24, 2017 Report Share Posted May 24, 2017 (edited) Mick Don't know how many miles you have done on the cam but might be worth inspecting, I had one fitted to my engine back in the 90's and lit lasted about 3000 miles before all the lobes wore off it ! but I've got a figure here from the original install sheet showing 0.024" So might be worth having a chat with Daryl as things may have changed since 1990 ! Edited May 24, 2017 by Graham Quote Link to post Share on other sites
Guest ntc Posted May 24, 2017 Report Share Posted May 24, 2017 Them days that about how long they lasted,I had one do 40 mile. Quote Link to post Share on other sites
astontr6 Posted May 24, 2017 Report Share Posted May 24, 2017 Them days that about how long they lasted,I had one do 40 mile. Neil, Where did that cam come from? Mine lasted 40+ years and was a BL replacement one but the original BL one lasted 12000 as 2 of the lobes went home! Bruce. Quote Link to post Share on other sites
pinky Posted May 25, 2017 Report Share Posted May 25, 2017 (edited) Them days that about how long they lasted,I had one do 40 mile. maybe you didn't fit it correctly Neil Edited May 25, 2017 by pinky Quote Link to post Share on other sites
Blue cedar Posted May 25, 2017 Report Share Posted May 25, 2017 Pinky, if it was fitted the wrong way round, Neil did well to get 40 miles out of it. Perhaps it was the cam lube that stretched it's working life ! Quote Link to post Share on other sites
pinky Posted May 25, 2017 Report Share Posted May 25, 2017 hi Pete, maybe he did both, no cam lube, and the wrong way round, could have adjusted the tapet's wrong Quote Link to post Share on other sites
Blue cedar Posted May 25, 2017 Report Share Posted May 25, 2017 That's true......both not all three....surely ! Quote Link to post Share on other sites
Guest ntc Posted May 25, 2017 Report Share Posted May 25, 2017 Fitted by them,I know of many more that failed. Quote Link to post Share on other sites
Tom Fremont Posted May 25, 2017 Report Share Posted May 25, 2017 Hi Mick and welcome to the forum, I'm running a RCT 1312@ 105 cam said to be developed by Racetorations which I sourced from Piper directly after receiving (2) defective ones from Racetorations ( one of which seized in the block ) along with crowned tappets ( which began pitting the 2nd after 150 miles ) all for which I received no redress whatsoever. The current cam has done 4000+ miles with a Racetorations supplied head with its very special valve springs and other features, and Newman followers which are flat. It's a collision cam ( lift higher than the headroom above the pistons ) which I discovered myself - no disclosure by Darryl - so I wouldn't take one X-country. It's a ripper to drive but I have another '250 which gets 10X the miles per year. Think roulette . Cheers, Tom Quote Link to post Share on other sites
Guest ntc Posted May 25, 2017 Report Share Posted May 25, 2017 Hi Mick and welcome to the forum, I'm running a RCT 1312@ 105 cam said to be developed by Racetorations which I sourced from Piper directly after receiving (2) defective ones from Racetorations ( one of which seized in the block ) along with crowned tappets ( which began pitting the 2nd after 150 miles ) all for which I received no redress whatsoever. The current cam has done 4000+ miles with a Racetorations supplied head with its very special valve springs and other features, and Newman followers which are flat. It's a collision cam ( lift higher than the headroom above the pistons ) which I discovered myself - no disclosure by Darryl - so I wouldn't take one X-country. It's a ripper to drive but I have another '250 which gets 10X the miles per year. Think roulette . Cheers, Tom Some have short memory's Tom Quote Link to post Share on other sites
Nick Jones Posted May 25, 2017 Report Share Posted May 25, 2017 The followers can be a big part of he problem They need to be flat and they need to be hard. There are, unfortunately, plenty around which are neither and will kill the cam and themselves very quickly. Takes BIG lift to create an interference engine from a Triumph 2.5! Nick Quote Link to post Share on other sites
Graham Posted May 25, 2017 Report Share Posted May 25, 2017 (edited) The followers can be a big part of he problem They need to be flat and they need to be hard. There are, unfortunately, plenty around which are neither and will kill the cam and themselves very quickly. Takes BIG lift to create an interference engine from a Triumph 2.5! Nick 1312 has .445" I think Edited May 25, 2017 by Graham Quote Link to post Share on other sites
Tom Fremont Posted May 25, 2017 Report Share Posted May 25, 2017 1312 has .445" I think 0.502" / 0.504" according to the sheet. When one of these seized in the block ( scant oil grooves in the bearing journals ) I de-clutched in time for the engine to stall before damage was done to the valves, just as the cam sprocket bolts sheared. A piston was slightly kissed so was replaced. 10.7:1 c/r ( not what I asked for, but what I got ) so head room circa 0.400". Cheers, Tom Quote Link to post Share on other sites
astontr6 Posted May 26, 2017 Report Share Posted May 26, 2017 Hi Mick and welcome to the forum, I'm running a RCT 1312@ 105 cam said to be developed by Racetorations which I sourced from Piper directly after receiving (2) defective ones from Racetorations ( one of which seized in the block ) along with crowned tappets ( which began pitting the 2nd after 150 miles ) all for which I received no redress whatsoever. The current cam has done 4000+ miles with a Racetorations supplied head with its very special valve springs and other features, and Newman followers which are flat. It's a collision cam ( lift higher than the headroom above the pistons ) which I discovered myself - no disclosure by Darryl - so I wouldn't take one X-country. It's a ripper to drive but I have another '250 which gets 10X the miles per year. Think roulette . Cheers, Tom I would not buy anything from them I had enough trouble over a simple thing like an alloy rocker cover. They have no proper knowledge of metallurgy or machining, I have rebuilt my engine after 40+ years and after reading all the tales of woe regarding camshafts I went for a Newman chilled cast iron cam along with their EN40B cam followers and TR5 Valve Springs from Chris Whitor as advised! So I will have to see how this performs in the long term, as I have already done over 1k since last October. Bruce. Quote Link to post Share on other sites
Nick Jones Posted May 26, 2017 Report Share Posted May 26, 2017 I've got a Newman PH2/PH3 hybrid in my Vitesse with EN40B followers. Done about 6k now and the valve clearances (checked this morning) haven't moved in that time - so I reckon it's ok. Nick Quote Link to post Share on other sites
astontr6 Posted May 27, 2017 Report Share Posted May 27, 2017 I've got a Newman PH2/PH3 hybrid in my Vitesse with EN40B followers. Done about 6k now and the valve clearances (checked this morning) haven't moved in that time - so I reckon it's ok. Nick Hi Nick, I am led to believe that Newman is now supplying a number of the other camshaft profilers with his blanks. So that now tells a story! Bruce. Quote Link to post Share on other sites
peejay4A Posted May 27, 2017 Report Share Posted May 27, 2017 (edited) I have the same spec Newman 4 cylinder cam in Eric and it's been fine for around 10k miles so far. Edited May 27, 2017 by peejay4A Quote Link to post Share on other sites
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.