H-I-J '76 Nova re-fit.

[Nmbr1GMfan]

Press in plug has been replaced by a pipe plug. More bearings.

[Nmbr1GMfan]

Although these pictures are very hard to make out, here's the previous pressed in plug slightly blocking the galley and the current pipe plug, well, not blocking the galley.

[Dissident]

Todd & Autumn,


The guys at Calico do a good job.


I had asked before, but do not recall the answer if it was given (getting old!). Is the bypass in the oil filter block adapter plugged? IF not, loads of oil does not get filtered. IF it is plugged, all the oil gets run through the filter.



Lots of gonna, wanna, shoulda, on this subject, but a race engine is not an over the road design so some factory philosophy must be rethought.



Hope you are narrowing in on the oiling problems and can get in some dyno testing soon.


Regards,
HB2
Dissident

[Nmbr1GMfan]

Originally Posted by Dissident

Todd & Autumn,


The guys at Calico do a good job.


I had asked before, but do not recall the answer if it was given (getting old!). Is the bypass in the oil filter block adapter plugged? IF not, loads of oil does not get filtered. IF it is plugged, all the oil gets run through the filter.



Lots of gonna, wanna, shoulda, on this subject, but a race engine is not an over the road design so some factory philosophy must be rethought.



Hope you are narrowing in on the oiling problems and can get in some dyno testing soon.


Regards,
HB2
Dissident

Yes, the bypass is plugged.

[Tim H]

Forcing all the oil to be filtered by blocking bypass is not necessarily a bad thing. We did it on a 427 years ago with good results. That engine also had moroso gallery restrictors to limit oil up top as it had alum. roller rockers and was drag strip use only.
Not understanding why Dissident shows the EEK emoji ?

[Dissident]

The EEK face was put in the wrong place!
Anyway, was trying to push for 100% filtered oil.......Now if I could only find my car keys and glasses


Have a great weekend and remember all the mothers out there.


Regards,
HB2
Dissident

[Rich Biebel]

This engine has something way more wrong than these minor things like blocked filter bypass or a partially blocked passage under the cap.

If it striped up bearings just running for 1/2 hour and not on a dyno or at the track it is more than a minor issue.

So far its been blamed on

Pickup location
To much oil in the pan
Grooved lifter bores used with EDM hole in lifters
To much oil up top
Rear plug slightly out of position

This is a relatively low HP and RPM engine and one that generally is a trouble free engine design as it comes from Chevy.

A good clean block with no blocked oil passages.
A good line bore and crank sized to give you lets say about .025"clearance on mains and rods with a good thrust clearance as well
Good quality bearings
A good oil pump and pickup and filter
Clean assembly of all the parts....

Oil pressure could be across a pretty wide range and still be fine...
Oil viscosity and engine temp. changes that a good bit but lets just say some sort of pressure even at lower rpms and a warm engine.
30-40lbs hot at an engine rpm of lets say 1000....

Everything above is up to the engine builder....parts, bearing clearances, oil and so on..

To many cooks spoil the pot...and even though lots of info and tips may be helpful it has not solved this engine riddle.....

Something is clearly being missed.....something way more than minor....

Go back and look at the block and the crank more carefully....

[Tom Broome]

Originally Posted by Rich Biebel

This engine has something way more wrong than these minor things like blocked filter bypass or a partially blocked passage under the cap.

If it striped up bearings just running for 1/2 hour and not on a dyno or at the track it is more than a minor issue.

So far its been blamed on

Pickup location
To much oil in the pan
Grooved lifter bores used with EDM hole in lifters
To much oil up top
Rear plug slightly out of position

This is a relatively low HP and RPM engine and one that generally is a trouble free engine design as it comes from Chevy.

A good clean block with no blocked oil passages.
A good line bore and crank sized to give you lets say about .0025"clearance on mains and rods with a good thrust clearance as well
Good quality bearings
A good oil pump and pickup and filter
Clean assembly of all the parts....

Oil pressure could be across a pretty wide range and still be fine...
Oil viscosity and engine temp. changes that a good bit but lets just say some sort of pressure even at lower rpms and a warm engine.
30-40lbs hot at an engine rpm of lets say 1000....

Everything above is up to the engine builder....parts, bearing clearances, oil and so on..

To many cooks spoil the pot...and even though lots of info and tips may be helpful it has not solved this engine riddle.....

Something is clearly being missed.....something way more than minor....

Go back and look at the block and the crank more carefully....

We all knew what you meant, but I fixed it anyway.
I agree, something unexpected is going on here. Kudos to Todd for allowing SO MANY people to look over his shoulder!

[Rich Biebel]

Thanks....one zero missing....as you pointed out

I was not trying to be mean, just stating the obvious

Chevy’s generally have a good oiling system and can live without a lot of tricks in a race only application like this one

Yea I know they can and do get pushed very hard but again they do pretty well with the parts being used

[Hacksaw]

How about this one. The block has a hair line crack above the main caps and is almost impossible to see. When it comes up to operating temp. it opens up and bleeds off the oil before it reaches the main bearings.