Oil pressure question.

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Max1196 said:
Reading your other post, regarding valve clearance, You stated that you're using Comp 911-16's, These go in at 1.900/ 122lbs to 1.850/141 lbs. I'm gona ask NO click/tick when engine is cold? I watched the video. Low oil pressure when engine is warm? 10-12 or 13 lbs at idle aint gona cut it at keeping a hydraulic lifter filled with that kinda seat pressure. Especially with a 1 size fits all lifter program from Comp. SBM and BBM lifters kinda aren't the same.
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I have my stock purple valve springs and keepers look good condition, is it worth me popping those in for the heck of it?
Thanks
 
From a 1971 FSM. '383'. Minimum pump pressure at 500 rpm = 20 psi.
Minimum pump pressure at 1000 rpm = 45 psi.
 
Is it possible to remove the oil pump without lifting engine?
1968 factory 383 with stock mounts and exhaust manifolds,
Last one I did I had to lift engine 1968 big block Dart with Schumacher mounts and headers.
Thanks
 
Darren said:
Is it possible to remove the oil pump without lifting engine?
1968 factory 383 with stock mounts and exhaust manifolds,
Last one I did I had to lift engine 1968 big block Dart with Schumacher mounts and headers.
Thanks
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Maybe. What's so bad about lifting the engine if you have to?
 
This doesn't sound like an oil pump problem.....
It sounds like a 'too bigga the bearing clearance' problem.....
 
Bewy said:
This doesn't sound like an oil pump problem.....
It sounds like a 'too bigga the bearing clearance' problem.....
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Possibility..I had the shortblock built 8 ish years ago. I've only put a few hundred miles since.. I can not remember exactly what he did with the mains and rod bearings.. I'll have dig out the receipts .
Thanks
 
If the oil pressure is all you want to improve, order the 12 buck high pressure oil pump spring and put that in it. Five minutes and you don't even have to remove the oil pump.
 
RustyRatRod said:
If the oil pressure is all you want to improve, order the 12 buck high pressure oil pump spring and put that in it. Five minutes and you don't even have to remove the oil pump.
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I guess that's a good place to start.
 
I ended up finding the paper work from the machine shop.
Looks like they just polished the mains and rods..
It would have been nice if they would have stated the specs.

20220816_103350.jpg
 
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I can’t find that bearing number but if they are full groove mains and you have a standard volume pump you won’t have any pressure.
 
I do remember the machinest calling me because he got the wrong set of bearings , so I brought a set back to speed shop and they ordered me a different set.
I'll see if I have any paper work on that.
Thanks guys
 
Rat Bastid said:
Thanks for fixing that. IMO, running full groove mains and a standard volume pump is just wrong. You don’t have enough volume coming out of the pump at low engine speeds to feed the rods full time.

I’d swap out a HV pump and see what you get.
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I'm 100% in agreement.
 
I'm glad someone mentioned the main bearings.
That's the first thought that came to mind.
 
mopowers said:
Does the high pressure spring increase oil pressure at idle?
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Yes it will, but since we've found out he may have full groove main bearings, I wouldn't recommend it. I think he needs an HV pump.
 
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