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

[Rich Biebel]

The oil collects in the valley and can’t drain back as fast with those extension vents. I’d get rid of them and leave the holes open for faster drain back to the pan.

Use the screw-in the back restrictors and drill the holes out a little larger and see what that looks like along with removing those extension vents.

Just my 2 cents ....

[Nmbr1GMfan]

Originally Posted by Rich Biebel

The oil collects in the valley and can’t drain back as fast with those extension vents. I’d get rid of them and leave the holes open for faster drain back to the pan.

Use the screw-in the back restrictors and drill the holes out a little larger and see what that looks like along with removing those extension vents.

Just my 2 cents ....

Rich, thanks for the input. I'm worried about restrictors in the back of the block because that will restrict oil at the lobe, as well, I see a volume difference at the rocker from front to back. I'm afraid restrictors and the lower volume at the front will cause other issues. And as far as the extension vents, the engine on the stand is very slightly angled front up (but not as angled as when in the car) and the oil barely stays on the valley. I'm currently seeing all the oil running to the back of the head and straight down the rear drain holes.

[Dissident]

Todd, et al,

Trivial input perhaps, albeit solidly scientific in analysis.


The oil goes in the opposite direction of vehicle acceleration, so the oil return heads to the rear very naturally. So does the oil in the sump (pan).
The angle of the liquid is a function of the acceleration in g.
1g = 45deg liquid angle


60ft times reference is something interesting to look at. Particularly where the oil pickup is placed in a drag racing vehicle!

1.4sec = 62.28deg liquid angle
1.5sec = 58.9deg liquid angle
1.6sec = 55.54deg liquid angle


All these things and more were included in the paper I sent to you a while back. These things apply to all liquids in the vehicle, including the fuel system.


Regards,
HB2

[Nmbr1GMfan]

Originally Posted by Dissident

Todd, et al,

Trivial input perhaps, albeit solidly scientific in analysis.


The oil goes in the opposite direction of vehicle acceleration, so the oil return heads to the rear very naturally. So does the oil in the sump (pan).
The angle of the liquid is a function of the acceleration in g.
1g = 45deg liquid angle


60ft times reference is something interesting to look at. Particularly where the oil pickup is placed in a drag racing vehicle!

1.4sec = 62.28deg liquid angle
1.5sec = 58.9deg liquid angle
1.6sec = 55.54deg liquid angle


All these things and more were included in the paper I sent to you a while back. These things apply to all liquids in the vehicle, including the fuel system.


Regards,
HB2

As always an extremely enlightening post.

[Nmbr1GMfan]

I'm going to break these next posts up so I can better explain what i'm trying to learn, with that said I really appreciate everyones input and advice during this build. I know I haven't taken all advice because well, I just kinda do it my way in the end, thanks everyone for helping a newb. As a recap: This engine ran fine for for a long time for Bill.... I believe the bearing failure was caused by my lifter choice, completely my fault due to inexperience. I had a stock volume pump and a massive amount of oil at the rocker, add the EDM holes AND grooved lifter bores. Now this worked below 5000-5500 rpm, but as soon as we started 6000+ rpm it went to hell quickly, the dyno never showed a dip in oil pressure so I guess the end of the line (rods) just couldn't get the needed volume. I bought a new +10% volume pump but in the end used the stock volume. The first two pictures illustrate two different lifters, the ones that I put in it, Bullet branded with a 70K hole in the pushrod cup and a little puck thing under the cup. The third photo is a Trend lifter, it has no little puck thing and in the videos I'll post later you'll see I bought pushrod cups with different sized oiling holes.
Bullet:


Trend:

[Nmbr1GMfan]

In this first video you'll see differences in lifters and how they respond flow wise to the engine being primed. I use a distributor with o-rings but this priming tool does not, I just didn't want to take the time to grove and o-ring the tool for comparison. I did these tests so I could get a better understanding of why we had issues. I hope some finds this useful, maybe even keeps someone from making the same mistakes I have. Also as an edit here, I'll be checking oil pressure at the front and rear of the block on the dyno as well as working on a fix for that pressure differental.

[Nmbr1GMfan]

In the second video I wanted to check the difference between valley vents installed and removed. You'll have to go back and look at the difference between the two videos, to me it seemed nearly identical as far as the standing oil in the valley. I also believe without the three lifters heavilly oiling the rockers plus the o-ringed distributor body should dry the valley up even more.