Oil pressure - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 4 (permalink) Old 02-18-2018, 01:32 AM Thread Starter
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Oil pressure

I tried searching but can't find somebody that has measured pressure.
Oil pressure when cold is 40-50psi @2000rpm. The FSM specs 41-53psi @ 4000rpm hot, but my question is what should the hot oil pressure be at idle?
My oil pressure switch circuit is not working so I got a cheap-o oil pressure gauge for now. When hot pressure gets down to 10-13psi at 1200rpm idle.
What is the switch trigger pressure?

1989 VN750
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1982 Mercedes 300D
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post #2 of 4 (permalink) Old 02-18-2018, 10:46 AM
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Don't recall exactly, but the VN is 5-7psi to trigger the light.

Comparison - Harley Ultra idles with 10-12psi hot by OEM spec, has a dash mounted gauge.

General rule of thumb for most engines is a minimum of 10psi for each 1000 rpm, within reason. For instance, most won't see 90psi at 9000 rpm, but if your idle is near 1000rpm and oil is at least 10-12psi, you're good. Would like to see more, but it's not the end if you don't.

How did you install the gauge? Directly into the block fitting or plumbed out with copper or plastic tubing? Just curious.

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post #3 of 4 (permalink) Old 02-18-2018, 11:22 AM
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Quote:
Originally Posted by Spockster View Post
Don't recall exactly, but the VN is 5-7psi to trigger the light.

Comparison - Harley Ultra idles with 10-12psi hot by OEM spec, has a dash mounted gauge.

General rule of thumb for most engines is a minimum of 10psi for each 1000 rpm, within reason. For instance, most won't see 90psi at 9000 rpm, but if your idle is near 1000rpm and oil is at least 10-12psi, you're good. Would like to see more, but it's not the end if you don't.

How did you install the gauge? Directly into the block fitting or plumbed out with copper or plastic tubing? Just curious.
good rules of thumb to go by.

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post #4 of 4 (permalink) Old 02-18-2018, 10:15 PM Thread Starter
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Quote:
Originally Posted by Spockster View Post
How did you install the gauge? Directly into the block fitting or plumbed out with copper or plastic tubing? Just curious.
Retapped the pressure switch port for 1/8NPT. The gauge is just loose for now to see what the engine is doing. Without a pressure light I didn't want to risk running the engine not knowing if it had oil pressure.

Got a new generic 7psi switch coming. I will put a brass tee and keep the gauge. I'll figure out where to mount it after I get the air cleaners and tank back on.

1989 VN750
Highway blaster

2006 Honda Rebel Diesel
100mpg, low and slow

1982 Mercedes 300D
Modified engine, 4-speed manual
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