DIR Return Create A Forum - Home
---------------------------------------------------------
The Mighty Nuovo Falcone VOC
HTML https://nuovofalcone.createaforum.com
---------------------------------------------------------
*****************************************************
DIR Return to: Engine and Transmission
*****************************************************
#Post#: 2675--------------------------------------------------
Oil Pressure Relief Valve
By: patentgeek Date: August 6, 2019, 6:27 pm
---------------------------------------------------------
The oil pressure relief valve on our NF's seems like an odd
design. The primary function of the valve is to prioritize oil
supply to the crank and top end over the cam in the event oil
pressure drops - - - maybe because it's a lot easier to replace
a cam than a crank?
The position of the oil pressure switch upstream of the valve
(i.e., positive side) is also problematic. The switch could
indicate oil pressure is okay when the pressure relief valve is
stuck resulting in cam oil starvation.
Has anyone replaced their oil pressure relief valve with a fixed
orifice/jet?
#Post#: 2683--------------------------------------------------
Re: Oil Pressure Relief Valve
By: banquo Date: August 8, 2019, 6:00 am
---------------------------------------------------------
My understanding of this is very limited PG, but I've been told
by those I trust that the oil pressure relief valve operates the
same as any other (to limit pressure) but that the camshaft is
lubricated only when it's open. Hence I've been told that my
past practice of cruising along at low speeds to preserve my
engine may have the opposite effect, as the camshaft only gets
lubricated when the valve opens, and this at fairly high rpm.
There's a mod, common in Europe, to add an oil feed spray to the
camshaft, so it's always lubricated. Alternatively, give it a
good thrashing.
#Post#: 2684--------------------------------------------------
Re: Oil Pressure Relief Valve
By: patentgeek Date: August 14, 2019, 6:33 pm
---------------------------------------------------------
[quote]There's a mod, common in Europe, to add an oil feed spray
to the camshaft, so it's always lubricated. Alternatively, give
it a good thrashing.[/quote]
Does anyone have details on this modification? For example,
pics or specifications?
#Post#: 2685--------------------------------------------------
Re: Oil Pressure Relief Valve
By: banquo Date: August 15, 2019, 4:28 am
---------------------------------------------------------
I think you'll find it on the advrider post.
I believe Kater included it on his recent build, and there were
photos of a new oil feed pipe, and a well carved into the timing
cover?
Foid soething
here:
HTML https://advrider.com/f/threads/guzzi-nuovo-falcone.849445/page-95#post-28334398
Look at the index on Page 1 for oil feed mods
#Post#: 2688--------------------------------------------------
Re: Oil Pressure Relief Valve
By: patentgeek Date: August 18, 2019, 7:21 pm
---------------------------------------------------------
I found some pics on the German NF and Adventurerider sites.
One modification is to drill a small hole on the base of the
pressure relief valve such that oil always flows to the cam,
even when the valve isn't open.
Another modification is to completely replace the pressure
relief valve with a similarly sized piece of aluminum with three
small holes that acts as a manifold to feed oil to the two cam
lobes and the primary gears.
Another thing that came up in my research is whether the
pressure relief valve should have a "cup" around the valve. I
couldn't find the cup in the parts manual. The valve in my bike
lacks the cup, but I have a spare valve from an older engine
that has the cup. Any thoughts as to whether the cup is
critical?
#Post#: 2689--------------------------------------------------
Re: Oil Pressure Relief Valve
By: banquo Date: August 19, 2019, 5:09 am
---------------------------------------------------------
No idea I'm afraid....
#Post#: 2690--------------------------------------------------
Re: Oil Pressure Relief Valve
By: patentgeek Date: August 19, 2019, 12:19 pm
---------------------------------------------------------
I've been thinking more about pros/cons of replacing the
pressure relief valve with an "always flowing" oil manifold. It
might be possible to do this with a double or triple banjo bolt.
Carb jets could be fitted to the output of the banjo fittings
to control aperture diameter and flow - - - similar to what is
done for the intake rocker arm oil modification.
The potential risk is too much oil flow through the oil
manifold, resulting in insufficient oil flow to the crank and
top end. My NF has a Daytona twin oil pump and the clutch cover
crank oil seal modification, so I probably have less risk than
someone with a stock setup. I suspect I could run some
experiments with a pressure gauge installed in place of the oil
pressure sensor to quantify this risk.
#Post#: 2691--------------------------------------------------
Re: Oil Pressure Relief Valve
By: banquo Date: August 20, 2019, 2:28 am
---------------------------------------------------------
There's a blanked off oilway in the timing cover that exits on
the front face. It's one of the drillings for the main oil feed,
and could be drilled and tapped for a gauge without disturbing
the oil light sender
#Post#: 2693--------------------------------------------------
Re: Oil Pressure Relief Valve
By: patentgeek Date: August 28, 2019, 1:24 pm
---------------------------------------------------------
Regarding drilling a small hole on the base of the pressure
relief valve such that oil always flows to the cam, even when
the valve isn't open.
I've seen (2) different styles of pressure relief valve (pics at
the link below). The one with wrench flats at the base has space
for the jet. The one with wrench flats at the top does not.
HTML https://1drv.ms/u/s!AuFSdkt2JFpfhsp_hZ8kYWbifnF6cg?e=GaMcVZ
Both of my pressure relief valves lack the space for the jet :(
#Post#: 2694--------------------------------------------------
Re: Oil Pressure Relief Valve
By: banquo Date: August 28, 2019, 4:26 pm
---------------------------------------------------------
They may still be available from some of the German suppliers?
*****************************************************