Is this too much pressure?

[charger_john]

I'm still going over everything on this truck, guess it's kinda a hobby at this point.

I checked my compression and got 175 - 180 - 180 - 190 psi which is well above what the Haynes manual says is right. Nevertheless it looked like good news to me. Or maybe I need to stop shopping for my tools at the freight harbor?

Also checked oil pressure, very steady at 85-90 psi regardless of rpm or engine temp. Also a bit higher than I expected.

[geezer101]

Sounds like the engine is healthy. Now, if this engine has a 2.0 head on it that'll ramp pressure. Don't know about the oil pressure...

[Bjamin]

I agree with geezer, definitely healthy numbers and a head swap would change the numbers for sure. Oil seems a little high, if it were my truck I wouldn't be to worried about it. What oil viscosity are you running?

[geezer101]

The G63B engines had different oil pump assemblies - the later ones had bigger pump gears and were an improvement in oil supply and pressure over the older ones. IDK if there is a similar situation with the 4G54 oil pumps... it would explain the elevated oil pressure readings (or maybe there's an accuracy issue with the test gauge)

[Salteen]

then you have a perfect motor my guy, a 'miracle motor'

[charger_john]

then you have a perfect motor my guy, a 'miracle motor'
Yeah thanks, maybe it's time I stop looking for trouble lest I find it!

and BTW it's fresh Mobil 1, 10W-30

[claych]

??? 85-90 psi ??? oil pressure ...
If I may impose could You post a vid ?
Thanks

[pennyman1]

Is that with the balance shafts in, or the eliminator kit installed? The elim kit raises the oil pressure...

[geezer101]

Is that with the balance shafts in, or the eliminator kit installed? The elim kit raises the oil pressure...

No. The balance shaft eliminator kits fixes oil pressure :lmao:The balance shafts are a time bomb waiting to fubar your day. Wait til you see one that's been shredded...

[charger_john]

Okay I didn't run it long enough to get a good reading. :wtf: Sorry for my misspoked!! When *fully* warmed it goes down to a more reasonable 40-50 psi at idle, rising up to about 80 at cruising speeds. (Apparently it hits a pressure relief valve there.)

No, I can't post a video, but thanks for asking, LOL.... when I drive this truck I tend to use both hands, then when I have the oil gauge hanging into the passenger window, and trying to hold my phone camera on that might be problematic. Most of my years driving I've been a lazy driver with auto & power steering.

Oh, and I'm pretty sure I still have the balance shafts in there. I may never know unless I go taking it apart someday.

[geezer101]

Meh, the readings are still more than respectable. Yeah don't do any creative driving trying to make a video - it will be used as evidence against you when it goes horribly wrong :rolleyes:

[Bjamin]

I agree on the numbers, my last v8 Chevy was like that high until it warmed up and at rpm.

[claych]

I guess I should check back on My posts more frequently...
chargerjon,
Maybe have a passenger 'film/record' the oil pressure so You are not distracted by an 'mechanical oil pressure' gauge
while trying to handle all of that massive horsepower & torque -
(your truck does have a passenger seat ?? nes -pa ??).
I humbly apologize, I see you have updated you pressure readings since post # 10.
Thank You so much:yellow::yellow: