I'm not holding out much hope here as very few mount a pressure gauge onto their bikes or even test it.
However if anybody out there has information from their motorcycle I'd be interested.
This all started with a HiCam I have and was related to both overheating and oil pressure, anybody who frequents Wild Goose should be well aware of the problem as I've posted about it until everybody there is sick to the back teeth with it.......................so I came here . I can't be bothered going into the details about the overheating, but I thought the overheating and low pressure were linked, now I'm starting to think that the low pressure isn't a problem at all and for close to 2 years I've been chasing a ghost.
Recently I've gained a little more information, but its left me with a whole raft of questions that leave me baffled and confused. Lucky Phil came onto WG and started to assist, nothing definitve came of that, except I gained a lot more knowledge about these engines and I'm grateful for all his insight and time that he invested.
Starting from what I'm used to 2 valve engines
4 bar (58 psi) relief pressure, cold oil idle 65 psi or a little above (I assume the relief valve gets overwhelmed and pressure builds a bit over the valve setpoint)
Hot running above 3k approx high 50s or low 60s psi
Hot idle 15-10 psi usually
Hi Cam
5 bar (72 psi) relief pressure (larger oil pump), cold idle 50-54 psi
Cold to 3k, approx 70 psi (that test was done on a stationary engine and turning the pump with a drill, from experience it doesn't matter much if the engine is rotating or not)
No hot data to speak of right now, as the bike was only run once and was overheating so I haven't got a data point where the temperature reached an equilibrium
So I start to chase the missing pressure, the relief valve is set higher and I'm at least 10 lower perhaps 15 psi.
I'll let Kevin_T chime in if he wants to give his side but he stated on page 5 of Phil's HiCam build thread he never seen the pressure higher that 53psi on a Centauro (another C kitted HiCam)
Then fortuitously a buddy tests his Hi Cam engine, all of these HiCams are C kitted, just for completeness
Cold idle 52-53psi
Blip on cold to 3k approx 70psi (actual running engine)
Let it get warm (but not stabilised just for a few minutes till the heads are warm, perhaps 10 minutes idling) 48psi
One more thing,
When I removed the rocker carriers (which also locate the cam followers) and left the head oil feed holes to the rocker exposed then cranked the bike the oil pressure on the gauge dropped from 50psi to 32, cold oil. These feeds do not appear to me to be that large, so the 18psi drop was a surprise.
The green arrows are the exposed feeds
I wonder is the pressure I'm seeing system wide or is the pressure switch tapping point I'm measuring the pressure from badly placed, it never was after all meant to really represent true system pressure.
The take for me is there probably nothing wrong with the pressure on my engine but I'm left wondering why the readings are so low.
The V11 went back from the Hi Cam's 21mm lobe pump to a 16mm but drives at a higher Crank/pump ratio and I hope to get some data on that soon
Anybody who had data they could add would be of interest to me and possibly to others
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