Factory Harley Oil Pressure Specs

Twin Cam Engine

Cold engine start-up:  around 44-50 psi 

Warm engine at 55 mph and up:  30 to 38 psi .

Warm engine At idle:  at least 10 psi 

Knuckle, Pan, Shovel & Evo Engine

Cold engine start-up:  around 44 psi 

Warm engine at 55 mph and up:  30 to 36 psi.

Warm engine at idle:  at least 10 psi 

E.R.T. Products  strongly advises that you follow

the Factory Harley oil pressure specs listed here!

If your engine does not meet these factory oil pressure specs, oil pressure too low, click your engine type below for the cure!

The cure for Harley oil pressure problems

Shovelhead

  Install instant oil pressure in your Shovelhead engine. Replace the stock Harley oil pressure relief spring. Easy installation!   

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Evolution

 Precise adjustable oil pressure for Evo engines. Replaces the stock Harley oil pressure relief cap & oil pressure relief spring.  

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Twin Cam

 Replace the stock Harley Twin Cam oil pressure relief spring. Works in all Harley camplates  including Screaming Eagle along with aftermarket camplates.   

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