I know this is an old post, but wondering if anyone has one of these cams lying around?
I contacted Piper and they are prepared to do another run of 5 units, so if there are four other interested parties out there .....?
Just a brief update Nick as there is someone else considering a Piper cam at the moment, so the possibility of getting another 5 made, might be a bit closer. Are you still interested in one, or have you sorted your Murena with another cam or had your own cam modified? If you have got yours running well again, I would be interested to hear about it, either by direct email to me, or if you wish to share it here, I'm sure others would be interested too. Thanks.
One thing I should point out for anyone considering the Piper 3777 cam, is that it will require twin side-draught carbs. possibly twin 45's, as it is the most potent of the road cams made for this engine, having 8.3mm cam lift, which is much more than the 'S' cam (only 7.4mm cam lift) and that meant you needed different valve springs because with that much lift the original springs would coil bind. Yes there were some racing engines, claimed to get around 184 horse power, but they would have been very costly and required lots of other things too, including such things as the special sodium filled valves, and they were not known for their reliability in racing either.
So if your Murena 2.2 only has the original single twin-venturi down-draught carburettor, whether the Solex 34 CICF or replaced with a Weber 34 DMTR, the cost of fitting a Piper cam will not be just the cost of the cam and valve springs, but also the twin side-draught carbs., a suitable air box, special inlet manifold, and the throttle linkage which is different, plus the setting up on a rolling road to get the carbs. correct for this cam. And if the engine hasn't been overhauled recently, you need to think about the wear in the engine first, as you should never try to tune a worn engine. So the real cost of fitting a Piper cam could be far more than just the price of the cam.
The first engine using the new Piper cam has been running well for a while using twin 45 carbs. but now we have another one running although this one has twin 40 side-draught carbs. and that is also going well, but it has not been set up on a rolling road yet to see what it can give once it has the optimum settings, or how it will compare with the one using the twin 45s, since it was first being run in, before putting it on a rolling road.
If you are actually rebuilding a 2.2 at present, then that could well be the time to do this sort of upgrade, but also bear in mind that many of these things like the original air box, inlet manifold and throttle linkage have not been available for a long time.
Roy