67 Chevelle Malibu (Convertible)
Hey guys, What should my oil pressure be reading at idle? The needle shows no pressure at idle but when I rev the pressure matches the RPM.
Thanks for your input, the reason I had it set so low was because when I shift from park to drive it really jerks the drive train, is that normal? It’s real smooth now when I shift.You might want to kick the idle up some. 700-750 rpm is about normal. On my built engines, I bump it to about 900 rpm.
Little more rpm at idle will bump your oil pressure.
I’m pretty sure my RPM is correct, I will turn up my idle a little and see what happens. ThanksNo it is not normal if it jerks at 650-750 rpm. Maybe your tach is wrong or you have a broken motor or tranny mount. Few motors will run at 400-500 rpms without stalling especially if that is a neutral rpm. I would find oil pressure under 15lbs at idle concerning, Do you know what oil pump you are using, standard, high volume or high pressure?
Standard stock oil pump, turned the idle up to 750 but it fluctuates between 750 and 650 in park and drops to around 550 to 500 in drive. The oil pressure is reading 15-10lb in drive idle. When I take the shifter from park to reverse the motor lifts on the pass side and jerks a little but when I shift from neutral to drive is shifts smooth no jerk.I’m pretty sure my RPM is correct, I will turn up my idle a little and see what happens. Thanks
I would think 40w would register a little more. Maybe those bearing clearances have opened up quite a bit since the rebuild. Has the pressure always been low? Or did it used to be higher? If it used to be higher, had the pressure gradually dropped, or was it a sudden decrease?10w40 Penn
Rebuild 28 years ago
Maybe 50k miles
It’s around 10lb per 1000 RPM when driving but will drop below 5lb and lower at a stop sometime, not all the time. I installed a new gauge with copper line but no change. The engine seems to run fine just don’t like looking down and seeing little or no pressure.I would think 40w would register a little more. Maybe those bearing clearances have opened up quite a bit since the rebuild. Has the pressure always been low? Or did it used to be higher? If it used to be higher, had the pressure gradually dropped, or was it a sudden decrease?
I just went back and read through the posts. What is your pressure while driving? If it’s a little on the low side also, maybe the clearances have opened up over time. 20w50 might be worth a shot.
Okay…no broken motor or trans mount👍🏻The strangest thing when I increased my RPM the motor doesn’t jerk like it did. I had someone give her gas with the E brake on and peddle brake while in drive, I got under the car and shined flash light on both motor mounts, you could see pressure on the mounts but they did not raise up.Looks like you have 1 or 2 broken motor mounts. Replace those and turn up your idle to 700 in drive.
Seems to be running fine, just took her on a 20 mile run. If my RPM in drive is at 700 the way I want it, what should my RPM in park be?That's a big drop in RPM from Park to Drive. Id check your timing both in Park and Drive (mech and vac. adv. settings), any vacuum lines for leaks (full or ported vac?) and pending Carb, reverify Idle Mixture Screws are set the same using a VAC Gauge.
Okay I missed around with the timing, N 800-900 D 650-700 sounds good, idles good, drives good...do y’all think I’m okay with that??? And my oil PSI is reading about 10 pre 1000.My Goodwrench 350 is about 750ish in neutral, and about 650 in drive.
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