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Hi,
I just put in a new long block 6.2L in my 1991 Chevy Suburban. What kind of oil pressure readings should I be looking for? In my previous 6.2 I would see around 50-60 cold and 30-35 when at normal operating temps. This new engine shows only 45-50 cold and around 25-30 when at normal operating temps. All of these reading are at idle. Thanks. :)
Additional informantion:Quote:
Originally Posted by 3ace
After starting the engine and warming it up about 4-5 minutes and drove about 1 miles to the freeway.
I drove 25 miles with about 23 miles of freeway.
This is what I reading on my oil pressure guage:
Ambient temperature around 50F.
at idle (cold) 55psi
at 70mph: 39psi
at 55mph: 35psi
at idle: 19psi
Do these readings sound good, I was concerned about the 19psi at idle after reaching operating temperature.
Thanks. :)
What gauge combination are you using for your readings?
The factory gauge gives different readings than an aftermarket digital. The factory gauge seems to give a higher than actual reading.
My typical 6.2 gives ~60 psi cold idle, little higher running down the road cold. Hot, I see 35psi idle and around 50-55psi running 2k RPM down the interstate at 70MPH (automatic 700R4 overdrive).
19 psi is not alarming.
Oil pumps vary, mainly in the regulator valve.
Every 6.2 and 6.5 (early 6.5's not later 97's up) have seen the factory gauge as mentioned above.
J
I'm using the OEM guage and the OEM oil sending unit installed at the rear of the left head.Quote:
What gauge combination are you using for your readings?
I'm seeing 39psi at 2k RPM down the interstate at 70MPH (automatic 4L80E)Quote:
My typical 6.2 gives ~60 psi cold idle, little higher running down the road cold. Hot, I see 35psi idle and around 50-55psi running 2k RPM down the interstate at 70MPH (automatic 700R4 overdrive).
It's good to hear that 19psi at idle hot is ok.Quote:
19 psi is not alarming
Thanks for your input.
Have a great new year! :)
The general rule on these is "Hot" down the road at 40 PSI and "HOT" idle at 20 PSI
The numbers you are showing are certainly in the groove so to speak.
If you are at all worried, install a T fiiting and plumb in a good quality mechanical gauge and mount it under the dash.
I have seen 6.2 engines (new rigs, back in the day) run 35 down the road and idle at 10-15
I prefer the 20-40 or a tad higher.
As John mentioned, these vary.
Just screwing in a new sending unit may change the whole picture.
I have seen sending units change the readings as much as 10 PSI
You should be running a good diesel rated 15-40 oil.
I had a 94 Burb that had some miles on it and it would run 35 down the road and after a hard session of pulling hills and such, would drop to only 10 at idle.
Keep us posted
Missy
[quote]
I feel a lot more comfortable now!!Quote:
Originally Posted by Robyn
I like this idea.Quote:
If you are at all worried, install a T fiiting and plumb in a good quality mechanical gauge and mount it under the dash.
I agreeQuote:
I prefer the 20-40 or a tad higher.
My readings are with a new sending unitQuote:
Just screwing in a new sending unit may change the whole picture.
I have seen sending units change the readings as much as 10 PSI
I'm using Chevron Delo 400 15/40WQuote:
You should be running a good diesel rated 15-40 oil.
And I was worried at 20psi!!Quote:
I had a 94 Burb that had some miles on it and it would run 35 down the road and after a hard session of pulling hills and such, would drop to only 10 at idle.
Thanks for your input! :)Quote:
Keep us posted
Happy to help :)
Missy
i read on another page that you recommend a oil cooler behind the grill, my 1984 6.2 goes into the radiator. Would you by pass that and just use the cooler. As i am worried about the radiator my trans lines got a pin hole in them water in trans destroyed it
If you are worried about internal cooler leaks, adding the external cooler behind the grille is a great idea.
The later trucks all have the oil coolers behind the grille and not in the radiator.
The tranny cooler is still in the radaitors though.
I prefer an oil to air cooler for the tranny, the only time this can be an issue is during really cold weather (Below Zero) and then there is the possibility of getting the tranny oil too cold, but a winter front will solve that issue.
Missy
Thanks for the reply i have already plumbed the trans to a cooler out front and now will be looking for a oil cooler. also does a 6.2 run smooth on idle as mine seems to idle like a gasser with the occassional mis
This is mine cold start on highidle
http://www.youtube.com/watch?v=Xy8UUEahmKo