Thank you docc
Yeah, plugs out so its spinning close to idle speed. If it's anything like the old spring, the crank and idle pressure will be identical. I don't think many are that interested in the HiCam but I thought this thread might be worthwhile. The agony I've been through trying to understand this engine and the MGS (no I don't own one) changes etc have taken forever and were hard won (and I'm only in the twilight knowledge wise). I'm not that bright but luckily I lucked in when
1) Found Lucky Phil's HiCam thread
2) I'm taking advice from Phil on and off about where to go to next, thank goodness for another "superfan" of these lumps and brimming with experience and know how to boot
I'm pretty sure that the pulsing you can see is the spring lifting, so it controls around 82psi but I worry about what will happen when the valve chokes, relatively few revs required for that to happen on cold oil.
As I mentioned in the original post, which is a bit long, so a lot may just skim through it and not take it all in. But for anybody thinking about which way to go to eliminate the "Grenade with the pin out" pump there is a lot to chew on, bad news as it is for the cheapskates of this world.
A lot think that the MGS-01/V11 chain config must be the "Dog's Doo Dahhs" because the MGS-01 is the pinnacle of these engines. It is but the thing is Guzzi made significant changes to the head design and the MGS heads don't drink oil like a Scotsman finding a pub with free beer in the desert.
The pressure on these engines is governed by the relief valve (Duhh) but the kicker is that the valve has only just gotta crack a little and the pressure starts to drop through the floor. Combine that with the heads insatiable thirst for oil and signifcant cooling issues (these engines run toasty hot, well mine does) and you can be balancing on the head of a pin.
I've still got a few rabbits in the hat yet, including a new oil cooler, a second oil cooler to be mounted in series to the first and finally going to a 10/60 synth, not to mention perhaps trying to source a halfway house spring. My worrry about the high cold pressure is the rear mains seal, it's not the end of the world to replace but its not a job I'd lke to be doing every time I took her out for a run.
John