how much idle oil pressure does an evo need?

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Sep 25, 2009 | 08:18 PM

#11

miacycles

Elite HDF Member

Joined: Sep 2007

Posts: 4,468

Likes: 12

From: Bluffton, South Carolina

There really isn't a definitive number because there are so many variables:actual engine RPM's(not what the tach says), the gauge, engine clearances, oil temperature, engine temperature, oil pump clearances, by-pass spring settings, and on and on. It's kind of like asking "how far is up??". As I stated before under normal circumstances the range of 7-10 lbs per 1,000 RPM's is usually accepted as "normal". At an idle with no load on the engine you can get away with slightly less, but not much. Hope this helps.

Sep 26, 2009 | 08:48 PM

#12

89 FXRS

Cruiser

Joined: Dec 2007

Posts: 213

Likes: 2

Quote:

Originally Posted by bigtone

Typically most agree that very little pressure is required. In actuality, just enough head pressure to pump the oil up to the rockers, which is way less than a pound. The key is to have oil flow. My old Ultra has about 8 psi at idle on a hot day after riding awhile. With the original jetting in the carb, it would drop to 0 with the oil light flashing occasionally at idle. Now with it jetted richer, it runs noticeably cooler, and the pressure reads higher. I know these numbers are accurate as I tested my oil sender and gauge. My gauge actually reads 3 psi low, and my light comes on just about 2.5 psi.

Dude, your idle is set too low if your oil light is coming on. I believe that the Evo is suppose to idle at 1000 RPMs.. When I had a Shovel and even my Pan the idle was very low with a distinct thump of the pistons. But not my Evo.. To tell the truth I do miss the sound of the very low idle. Oh well it is not a Shovel! Bump your idle.

Jul 7, 2024 | 08:11 AM

#13

Huckster

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Joined: Feb 2011

Posts: 85

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From: South Eastern Wisconsin

I have 22 psi on my 97’ EVO motor

Quote:

Originally Posted by jurob

i'm looking for an actual number on an accurate gauge. anybody know the spec for low oil pressure at idle when it should go into the shop for a bottom end or whatever?

btw, my pressure is fine.

My old gauge that came on bike when i bought it didn’t work. I bought this gauge recently, it is meant to work on the Harley EVO motor. It says 22 psi. At idle speed.

Jul 7, 2024 | 08:22 AM

#14

98hotrodfatboy

Seasoned HDF Member

Joined: Mar 2010

Posts: 20,850

Likes: 7,391

From: Poolville

Quote:

Originally Posted by Huckster

My old gauge that came on bike when i bought it didn’t work. I bought this gauge recently, it is meant to work on the Harley EVO motor. It says 22 psi. At idle speed.

That's pretty high for idle.. I would imagine somebody probably put a different relief spring in it or something..5-7 is normal at idle 950-1000 rpm....