oil pressure increase

[jug]

If I am putting a 3 hole crank pin in will I need to increase oil pressure a bit? also does anyone know where to get 96921-52 gauge or just buy a gauge 0-60 and make one?

[T. Cotten]

If I am putting a 3 hole crank pin in will I need to increase oil pressure a bit? also does anyone know where to get 96921-52 gauge or just buy a gauge 0-60 and make one?

Its not about pressure, Jug!

Its about flow.
Pressure means somethings' in the way.

If the feed pump is in decent condition, it should do fine with either pin (when everything else is in order...)

Forum member Kitabel wrote a pamplet on flatty oiling updates, and I hope he chimes in soon.

....Cotten
PS: Gauges take your eyes off the road.

[jug]

forgot one thing. is that a 1/8 straight thread in the cam cover for pressure port?

[kitabel]

The 3 holes don't increase the volume of oil since the restriction is the supply holes in the pinion shaft, right flywheel half, and crankpin taper.

[41craig]

Jug; I would make my own. If you can find an OEM gauge, it may not work properly from sitting for years. The rubber hose is probably dry rotted or in bad shape from old oil in it. And it would not be cheap. Just my 2 cents.
Craig

[T. Cotten]

The 3 holes don't increase the volume of oil since the restriction is the supply holes in the pinion shaft, right flywheel half, and crankpin taper.

Good point, Kitabel!

But isn't flow only available for a brief instant when the pinion shaft feed aligns with the cover bushing's hole?

If it was about pressure, everything would just go through the bushing's clearance into the cam chest. Or the bypass as intended when cold.
So how did they run forever?

I believe it is because the crank sucks.

....Cotten
PS: Didn't Indians have four holes?

[PRG]

Howdy chaps,

Don’t know about HD flatties but on Indians I refer to the supply side as a metering unit as it merely controls downward flow from the tank and is sealed to the case where the oil enters the timing side shaft by a mere felt washer, incapable of meaningful pressure. It’s the scavenge side that does the real pumping.

[T. Cotten]

Howdy chaps,

Don’t know about HD flatties but on Indians I refer to the supply side as a metering unit as it merely controls downward flow from the tank and is sealed to the case where the oil enters the timing side shaft by a mere felt washer, incapable of meaningful pressure. It’s the scavenge side that does the real pumping.

I know what you mean, Peter!

(Indian's two gears working against one was a 'real jewel'.)

But a crank doesn't know there's a scavenger downstream.
As long as it has something to suck in, it spits things out.

....Cotten

[kitabel]

Yes, the flow is intermittent, but I think that's to increase pressure when pump speed is low. Some WR engines were converted to full-time, which will work if the engine is always running fast, like shutting off the base oilers in KR engines.
I read some interesting comments decades ago about the effect of centrifugal force on the oil in the Triumph twin crankshaft, but can't find it?

Strictly speaking, if 3 holes are intended to ration the oil among the 3 rod races, the holes should be progressively larger right to left to balance the pressure loss.

[jug]

Kitabel, now I am ready to run the old 45 , at what pressure does oil switch operate? switch 26550-38. I am cranking with starter motor with the plugs out and the light goes out. Was cranking to get return oil coming to the tank and thinking I am ok. Book says 8 lbs at 20 mph. Got switch from 45 Restoration and assume its a good one.

[41craig]

Jug; I would make my own. If you can find an OEM gauge, it may not work properly from sitting for years. The rubber hose is probably dry rotted or in bad shape from old oil in it. And it would not be cheap. Just my 2 cents.
Craig

So this is the part of never, never land that this post went to.

[jug]

Well some of us don't have all the resources and modern shops of others so we come here to get all the good dope from the guys that know more than we do. Maybe we can all learn something.

[T. Cotten]

Well some of us don't have all the resources and modern shops of others so we come here to get all the good dope from the guys that know more than we do. Maybe we can all learn something.

I learn from all of it, Jug!

Fortunately, I was lucky enough to collect 'resources' from dumpsters over the years, so conjuring a gauge would be mostly a drawer search.

But I defer to Kitabel if any readings will mean anything at all.
The temperature variable made me leave it all to Providence, and worry about other things.

(Like, ever notice how racers never sumped?)

....Cotten