Neil Clark Posted June 13, 2020 Report Share Posted June 13, 2020 Do these engines always run so smoothly? It's not "thrashy" like my MGB at the top end. I've no idea what was done to the engine when the PO had it rebuilt, all I know is that it's the original engine number from the Heritage certificate and it has a Weber carb. The engine seems to rev really willingly to 6000 plus. I read that 6000 is the max revs for power back in 1963 but it seems to want to run past that. Link to comment Share on other sites More sharing options...
Adrian Cooper Posted June 13, 2020 Report Share Posted June 13, 2020 The 1147 with the Mk2 Spitfire cam is an absolute jewel. They are remarkable free-reving and surprisingly torquey for their size and they never seem to run out of puff. I remember reading that it was the most efficient of all the engines in the small chassis Triumphs, but I may have imagined that. Anyway, I think you are very lucky to still have the original as most of the Mk1s&2s I see advertised seem to have one of the later engines in place. Enjoy it!, rev its nuts off! Adrian Link to comment Share on other sites More sharing options...
NonMember Posted June 13, 2020 Report Share Posted June 13, 2020 My brother's old Mk2 wasn't smooth and got thrashy at high revs, but then it had no thrust washers, a 60 thou overbore, a crack in the block... not a good example. Still went like stink, though. Link to comment Share on other sites More sharing options...
Neil Clark Posted June 14, 2020 Author Report Share Posted June 14, 2020 Can't wait to get it on the road then! Link to comment Share on other sites More sharing options...
Neil Clark Posted June 14, 2020 Author Report Share Posted June 14, 2020 Mine's a Mk1 engine. Is there any way to identify which cam has been fitted? If it had been swapped? Link to comment Share on other sites More sharing options...
DanMi Posted June 14, 2020 Report Share Posted June 14, 2020 Without taking the cam out and looking for an identifying numbers, the only way would be to measure the valve timing. Of course if they have fitted a weber carb it's not unlikely that the cam is not standard. It may also have had other mods. Mine is pretty easy to rev and is standard Link to comment Share on other sites More sharing options...
Neil Clark Posted June 14, 2020 Author Report Share Posted June 14, 2020 Thanks Link to comment Share on other sites More sharing options...
Nigel Clark Posted June 14, 2020 Report Share Posted June 14, 2020 The 1147 Spit Mk2 and 1296cc Mk3 are the best four cylinder engines Triumph made in my opinion. And the 1147 is so smooth, whether in Spitfire or Herald tune. Nigel Link to comment Share on other sites More sharing options...
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