So just a friendly tip: Oil return is the name of the game we play in the lifter valley. We like to keep it off the crank and camshaft to reduce windage. So we return oil to the front and rear of the block only by plugging and venting the other returns along and above the cam tunnel. Personally, I believe this is best achieved in several ways. First enlarging the oil returns at the rear and front of the block(which you clearly did). The front return should be brought down as far as possible to allow the least amount of restriction. Secondly, polishing all the area that the oil will be flowing over from front to back. We're reducing the available return so why not help the oil get where it needs to go. Finally, the corners of the valley from the deck surface down. The cylinder head returns oil in those corners. About a 2" wide area from the deck surface down is adequate. Like I said, personally, this is how I care to address the lifter valley oil return.
@ 20:02 for close quarters finesse work, I like to use 1/8" shank carbide burs in a Dremel or a pencil grinder. I use a similar Makita grinder with a speed controller and that bulky thing can gouge easily in tight spots. Good job though. Oh and long shank burs will help let you see what you're doing. The grinder won't be in your way so much. Finesse.
I wonder if the smaller oil passages that are in the block especially the one where the oil pump sits is smaller for a reason possibly to create pressure like the end of a pressure washer hose tip the smaller hole can create higher pressure…it’s just a thought.
Yes in the rest of the block. At the particular mounting point of the oil pump NO. That causes the largest restriction for the oil pump. The delivery and volume wasn't so much the problem or the biggest problem. The restriction causes the pump to pulsate as its pushing the oil into that small sharp orifice from its larger feed area. Each time it turns a lobe of the pump gears and pushes oil out there is feedback through the shaft driven gear. That shaft is 1/4" hex mild steel and transfers that pulse to the distributor shaft driving it. That pulse can cause erratic rotor movements and/or twist the driven shaft to the pump altogether. Using a hardened steel thicker shaft reduces the risk of twisting, but the reduced area area at the block mating surface is still the restriction and the root cause for the shaft failures. The area after the turn from the mating surface, maybe an 1" or so, opens up to almost 7/16"(maybe smaller but still larger). So at that point we open her up. This is the way
So just a friendly tip:
Oil return is the name of the game we play in the lifter valley. We like to keep it off the crank and camshaft to reduce windage. So we return oil to the front and rear of the block only by plugging and venting the other returns along and above the cam tunnel. Personally, I believe this is best achieved in several ways. First enlarging the oil returns at the rear and front of the block(which you clearly did). The front return should be brought down as far as possible to allow the least amount of restriction. Secondly, polishing all the area that the oil will be flowing over from front to back. We're reducing the available return so why not help the oil get where it needs to go. Finally, the corners of the valley from the deck surface down. The cylinder head returns oil in those corners. About a 2" wide area from the deck surface down is adequate.
Like I said, personally, this is how I care to address the lifter valley oil return.
Thanks for the info! I really appreciate it. I’m still learning as I go along with this build.
@ 20:02 for close quarters finesse work, I like to use 1/8" shank carbide burs in a Dremel or a pencil grinder. I use a similar Makita grinder with a speed controller and that bulky thing can gouge easily in tight spots. Good job though.
Oh and long shank burs will help let you see what you're doing. The grinder won't be in your way so much. Finesse.
Jeeze the rotary tool with the burr made me nervous, I don’t have as steady of a hand as you. Good information here, thanks for the video.
Some of that sweat wasn’t from the heat 😂
@@CodyBuilds😂
I wonder if the smaller oil passages that are in the block especially the one where the oil pump sits is smaller for a reason possibly to create pressure like the end of a pressure washer hose tip the smaller hole can create higher pressure…it’s just a thought.
Yes in the rest of the block.
At the particular mounting point of the oil pump NO. That causes the largest restriction for the oil pump. The delivery and volume wasn't so much the problem or the biggest problem. The restriction causes the pump to pulsate as its pushing the oil into that small sharp orifice from its larger feed area. Each time it turns a lobe of the pump gears and pushes oil out there is feedback through the shaft driven gear. That shaft is 1/4" hex mild steel and transfers that pulse to the distributor shaft driving it. That pulse can cause erratic rotor movements and/or twist the driven shaft to the pump altogether.
Using a hardened steel thicker shaft reduces the risk of twisting, but the reduced area area at the block mating surface is still the restriction and the root cause for the shaft failures.
The area after the turn from the mating surface, maybe an 1" or so, opens up to almost 7/16"(maybe smaller but still larger). So at that point we open her up.
This is the way
😎🏴☠️
Tbh Cody, the thumbnail freaked me out! No offense.