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#51
03-13-2009, 12:10 AM
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Re: Low oil pressure in ZL-1
****Not saying it is,*****but I had a similar problem years ago on a rebuild--low oil pressure --oil pressure would increase some if I brought up the rpms..but would drop very low once the rpms came down----------We wound up changing the defective cam bearings,,,,Note: this is a last resort..The bright side of this problem is that you caught it in time,......
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#52
03-13-2009, 12:26 AM
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Re: Low oil pressure in ZL-1
You did put the relief valve in pointing the right way?
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1962 Oldsmobile Jetfire, Factory all Aluminum V8 Turbocharged and Methanol Injected TURBO ROCKET engine, 4 speed Hydramatic, 4 link rear suspension, 3.36 Anti-Spin differential, California car, PS, PB, PW, AC, Jetfire 2 option package.
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#53
03-13-2009, 12:34 AM
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Re: Low oil pressure in ZL-1
Yes, wrong or loose cam bearings could do it. My machinist said the ZL-1 cam bearings were not standard BBC, he put in Dart Block bearings-Durabond HP cam bearings GMP-12. Just throwing things out there.
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1962 Oldsmobile Jetfire, Factory all Aluminum V8 Turbocharged and Methanol Injected TURBO ROCKET engine, 4 speed Hydramatic, 4 link rear suspension, 3.36 Anti-Spin differential, California car, PS, PB, PW, AC, Jetfire 2 option package.
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#54
03-13-2009, 12:39 AM
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Re: Low oil pressure in ZL-1
[ QUOTE ]
You did put the relief valve in pointing the right way? [/ QUOTE ] OK which is the right way??..looked to be only one way but ...... also noticed when we were running the oil pump with a drill it never seemed to load up when it caught prime..Usually they really need some power to turn..this one never seems to prime and load the drill..maybe bad oil pump??
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1969 9566AA COPO Chevelle M-22 1969 Malibu 489 ZL-1 T-56/4.56 1969 Beaumont 540 th400 3.70 1969 Chevelle 300 Deluxe 427 ZL-1 M 22W 1970 Olds 442 W 30 2 door post 1969 Ply. GTX 426 hemi auto. Blue. 1940 Dodge pick up Durango 4X4 1968 Camaro ragtop LSA ZL1
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#55
03-13-2009, 12:40 AM
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Re: Low oil pressure in ZL-1
[ QUOTE ]
Yes, wrong or loose cam bearings could do it. My machinist said the ZL-1 cam bearings were not standard BBC, he put in Dart Block bearings-Durabond HP cam bearings GMP-12. Just throwing things out there. [/ QUOTE ] aware of the different cam bearings for this block..did buy the right one..but..we are going to re-check everything now..gonna pull some caps and make sure all is well
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1969 9566AA COPO Chevelle M-22 1969 Malibu 489 ZL-1 T-56/4.56 1969 Beaumont 540 th400 3.70 1969 Chevelle 300 Deluxe 427 ZL-1 M 22W 1970 Olds 442 W 30 2 door post 1969 Ply. GTX 426 hemi auto. Blue. 1940 Dodge pick up Durango 4X4 1968 Camaro ragtop LSA ZL1
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#56
03-13-2009, 03:53 AM
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Re: Low oil pressure in ZL-1
[ QUOTE ]
[ QUOTE ] You did put the relief valve in pointing the right way? [/ QUOTE ] OK which is the right way??..looked to be only one way but ...... also noticed when we were running the oil pump with a drill it never seemed to load up when it caught prime..Usually they really need some power to turn..this one never seems to prime and load the drill..maybe bad oil pump?? [/ QUOTE ] Yes. As stated previously,especially with cold oil the drill should kick back on you. If you aren't feeling that there there obviously is a problem. One thing you can do listen carefully because sometimes you will hear a gurgling or dripping sound where the oil pressure is being bled off. Are you running a roller cam in this motor? What type of lifter are you running?? If you would like to PM me I can carry you through this a little further. You also are more than welcome to call me at my shop (973)-267-4364. MB
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#57
03-13-2009, 04:10 AM
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Re: Low oil pressure in ZL-1
[ QUOTE ]
[ QUOTE ] [ QUOTE ] You did put the relief valve in pointing the right way? [/ QUOTE ] As stated previously,especially with cold oil the drill should kick back on you. If you aren't feeling that there there obviously is a problem. One thing you can do listen carefully because sometimes you will hear a gurgling or dripping sound where the oil pressure is being bled off. Are you running a roller cam in this motor? What type of lifter are you running?? If you would like to PM me I can carry you through this a little further. You also are more than welcome to call me at my shop (973)-267-4364. MB [/ QUOTE ] thanks Mike..running a Liunati solid roller..either comp or redline/redzone/redsomething roller lifters..nothing new or exotic..really has me scratching my head..12 hrs till engine removal 
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1969 9566AA COPO Chevelle M-22 1969 Malibu 489 ZL-1 T-56/4.56 1969 Beaumont 540 th400 3.70 1969 Chevelle 300 Deluxe 427 ZL-1 M 22W 1970 Olds 442 W 30 2 door post 1969 Ply. GTX 426 hemi auto. Blue. 1940 Dodge pick up Durango 4X4 1968 Camaro ragtop LSA ZL1
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#58
03-13-2009, 04:25 AM
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Re: Low oil pressure in ZL-1
Leave the motor in. Load the car on a Reliable truck to southern California and I will send you a check or wire the money to you. Then you can build another restored car and we can all watch the pictures again.
Mark Sheppard
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#59
03-13-2009, 05:12 AM
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Re: Low oil pressure in ZL-1
BTW... Since you have so much to say, the machinist did my motor as well. And runs like a raped APE... By the way, do you have any el-camino parts for sale ????? Or other parts???
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Tubbed 69 camaro
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#60
03-13-2009, 05:37 AM
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Re: Low oil pressure in ZL-1
NO COMMENT 427 SILICONE KING
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Tubbed 69 camaro
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