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  #11  
Old 22nd March 2016
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You can't buy a gauge that will accurately display 4psi and withstand the possible 80psi of a cold start.

You can't see a gauge at night, a light will get your attention faster than a gauge.
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  #12  
Old 22nd March 2016
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Cook Neilson wrote once about putting an oil pressure gauge on his drag bike. He was doing something like 150 and looked at the pressure and it was 15lbs which freaked him out. So much so that he removed it.

Consider that you should use 50-or 60 wt You could probably shut off the oil flow and just run what was inside the engine and it would run for probably 15 minutes (probably twice that). Roller bearing engines do not need high oil pressure. The oil just needs to move and cool a bit in the tank. The only bushings in the motor are on the cam side cover, they could use a bit of flow and are at ground zero, right near the oil pump. The other side of the cams ride in Torrington caged needles which require almost no oil but get plenty. Oil is pumped to the rocker arms which splashes all of the valve gear and is sucked down by gravity and engine vacuum to a point where it exits the barrel onto the side of the pistons. The rollers are force fed a lot of oil probably more to cool them than anything else, splash oil does the rest. Racing engines at Bonneville have 1quart oil tanks. They have what's in the engine and a quart to lose. Here is a true story that will make your hair catch on fire. A guy we know bought a very freshly rebuilt 66 or 67 and it wasn't put together. The engine was done by Chris Zootis one of the very best engine guys around. The guy put it together with the oil lines reversed. It ran but not all that well. Anyway the guy rode it around off and on short trips for two days before he finally figured out what was wrong. No damage at all. The assembly lube carried it a long ways I'm sure and some oil obviously made its way into that engine but it wasn't right. but it survived.

To review: Use 50 or 60wt, take the oil pressure gauge off and throw it away and ride the motorcycle. A modern Auto engine using 10-30wt and high oil pressure survives from a constant supply of clean oil between the bearing and the rod. A few minutes with no oil and the motor is toast. Same if it gets hot and warps the head. The Sportster engine is 1950s technology. It is far more robust and sturdy.
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  #13  
Old 22nd March 2016
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Quote:
Originally Posted by 11B40 View Post
Cook Neilson wrote once about putting an oil pressure gauge on his drag bike. He was doing something like 150 and looked at the pressure and it was 15lbs which freaked him out. So much so that he removed it.

Consider that you should use 50-or 60 wt You could probably shut off the oil flow and just run what was inside the engine and it would run for probably 15 minutes (probably twice that). Roller bearing engines do not need high oil pressure. The oil just needs to move and cool a bit in the tank. The only bushings in the motor are on the cam side cover, they could use a bit of flow and are at ground zero, right near the oil pump. The other side of the cams ride in Torrington caged needles which require almost no oil but get plenty. Oil is pumped to the rocker arms which splashes all of the valve gear and is sucked down by gravity and engine vacuum to a point where it exits the barrel onto the side of the pistons. The rollers are force fed a lot of oil probably more to cool them than anything else, splash oil does the rest. Racing engines at Bonneville have 1quart oil tanks. They have what's in the engine and a quart to lose. Here is a true story that will make your hair catch on fire. A guy we know bought a very freshly rebuilt 66 or 67 and it wasn't put together. The engine was done by Chris Zootis one of the very best engine guys around. The guy put it together with the oil lines reversed. It ran but not all that well. Anyway the guy rode it around off and on short trips for two days before he finally figured out what was wrong. No damage at all. The assembly lube carried it a long ways I'm sure and some oil obviously made its way into that engine but it wasn't right. but it survived.

To review: Use 50 or 60wt, take the oil pressure gauge off and throw it away and ride the motorcycle. A modern Auto engine using 10-30wt and high oil pressure survives from a constant supply of clean oil between the bearing and the rod. A few minutes with no oil and the motor is toast. Same if it gets hot and warps the head. The Sportster engine is 1950s technology. It is far more robust and sturdy.
+300

I see far too many guys on here freaking about oil, oil pressure, Oil type, etc.

Dive deeper into hd oiling history and you'll never, ever worry about oil pressure again.
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