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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.


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Old 06-17-2019, 04:28 PM   #1
solidsnake11
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Oil mods and still bearing failure LOL

So it spun number 2 and ate number 3 rod bearing 1 and 4 was great but I have narrowed it down to the main bearing shell oil holes, the hole through the crank is to small or the number 3 main bearing needs to be tighter than the rest.
Thought about drilling 6 more holes in the main bearing shell but I noticed king has elongated them in the new bearings if the picture is correct.
2 and 3 rod share the main crank hole but the main crank oil hole is the same size as the 1 and 4. I think I'm going to bring a line off the oil filter to the other side of the case halve and feed oil to the other side.
The block also has an oil grove under the bearing shell that is the same size on 1, 3 and 5. It could also be enlarged on #3 since it has to feed two rods and has a larger feed hole from the main oil gallery.

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Old 06-17-2019, 05:46 PM   #2
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welp, let us know how that goes and please update us with afterthoughts along with any data you can come up with.
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Old 06-17-2019, 05:58 PM   #3
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Some times our mods are no better than the engineers that designed the engine. In fact a lot of mods actually do more harm than good. What are you dong to the engine and what mods have you done?
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Old 06-17-2019, 07:19 PM   #4
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Quote:
Originally Posted by Grady View Post
Some times our mods are no better than the engineers that designed the engine. In fact a lot of mods actually do more harm than good. What are you dong to the engine and what mods have you done?
All of them
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Old 06-17-2019, 07:41 PM   #5
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It's really not about the mods it's about that the two other rod bearings were fine. This means the problem is right at the main bearing. There is not enough flow getting to the 2 3 rods. The oil galley hole to this main is way bigger than the others yet the bearing shell holes are the same, the hole through the crank and the groove in the block is the same yet it shares its oil with two rods. Pretty much forget about the rest of the oil system concentrate on this. We know we are getting enough flow here for one rod but not two. For these two to have the same wear rate as the other single rod mains something needs changed at the main.

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Old 06-17-2019, 08:49 PM   #6
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If anybody was wondering about my theories why it failed so soon.
1. I maxed out direct injection at 4500 with 3 psi of boost and back fired a few times while tuning the maf.
2. I returned my oil cooler line to the pan, it has it's on mechanical pump. May have aerated the oil, I really wanted to return in the front cover but was being lazy and didnt want to remove it.
3. Before I put the 2jz pickup on, the factory little screen got half stopped up.
4. And I turned 8000rpm during the 2 3 events.

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Old 06-18-2019, 01:10 AM   #7
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http://www.substech.com/dokuwiki/dok...mance_bearings


Good read.
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Old 06-18-2019, 07:24 PM   #8
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Has anybody use king bearings that have the elongated holes in the mains? Also have you guys seen the crankshafts that they use in the ejs that have double crossdrilled mains 1 3 and 5?

I think the centrifugal force from 2 rods is emptying the oil that is being supplied by the bearing shell and groove.


The FA20 has a ~9mm feed (oem) from the block to the bearing but the bearing shell (round hole) and grove in block doesn't come close to this flow? the oil has to go through the block grove which is much smaller than one hole in the shell so how does it possibly keep up with 6?
My thoughts are the block groove has enough flow for one rod so to keep up with two the groove needs to be twice the size. twice as deep or twice as wide or get the oil on the inside of the bearing some other way.

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Old 06-18-2019, 07:41 PM   #9
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I wonder if they're getting clogged with metal fragments in the oil. Try a magnetic oil drain plug ull be disgusted how much metal they pic kup
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Old 06-18-2019, 07:59 PM   #10
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The block groove measures 3.5mm x 4 mm. all the oil has to go through this groove before it goes to the main and then the rod.
The main oil feed measures 8.5mm

3.5 mm x 4 mm area =14mm2 if oil flows both ways around shell? Then this would be 28 mm2 for both direction the oil can travel in the groove.
At high rpms oil may not flow against the rotation of the crank in the block groove which would put you back at 14mm2.


round hole 8.5mm area = 56.745mm2

And we haven't even got to the crank yet.

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Old 06-18-2019, 11:54 PM   #11
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Modifications that Suzuki made for better oiling of rods.
http://www.australian-hayabusa-club.....php?tid=17451
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Old 06-19-2019, 09:34 PM   #12
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So I received my King bearings today direct from king and they have the same old round holes. I will be modifying one with a oblong hole above the 8.5mm block feed gallery on number 3 main. to get the oil on the inside of the bearing. I have not decided on double crossdrilling the crank(spec c style) or grooving the main on the crank or both.

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Old 06-20-2019, 12:40 PM   #13
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Ported oil feed, most work done on 3. Grooved bearing.
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Old 06-20-2019, 12:46 PM   #14
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3 hole bearing with ported gallery


Elongated bearing with ported gallery.

After this I drilled the main gallery to 12mm from the front to number 3 main. This helped put more water to number 3, before alot of the water was bypassing it and squirting out the 5 the thrust bearing.
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