FA20 Engine Oiling, Bearings, and Starvation

[Luckrider]

Originally Posted by Spartarus

I see your misunderstanding. It's a gear type pump. If you look up positive displacement gear pump you can find a few helpful animations to explain it. The gear doesn't turn the pump, the gear IS the pump. Well, it is the guts of the pump. The gear and outer ring are the part that actually moves the oil. These gears form a bigger pocket, moving more oil per rev.

The real confusion was that their product description only mentions stronger gears for reliability. It makes no note of higher flow rates or improved pressure. I actually wanted to "dominate all" and got "overnight parts from Japan." They arrived at Moto-East yesterday for installation while they rebuild my engine.

[Spartarus]

Originally Posted by Luckrider

The real confusion was that their product description only mentions stronger gears for reliability. It makes no note of higher flow rates or improved pressure. I actually wanted to "dominate all" and got "overnight parts from Japan." They arrived at Moto-East yesterday for installation while they rebuild my engine.

HA

I know it doesn't. That was figured out mathematically after purchasing it and finding that the tooth profile and count did not match stock. The assertion still hasn't been tested or documented. These engines don't hold anywhere near sufficient oil pressure to shatter a sintered gear. If they did, that would be a valid concern. The old Nissan RB and SR motors had problems shattering their sintered oil pumps. Even in the FA though, the outer ring stretches measurably over time.

[crazyfrenchbiker]

When I spoke with element a few months ago, they said they didn't see favorable results with the reimax gear/pump. I'm surprised Phil hasn't posted about it yet.

[350matt]

Originally Posted by Calum

You wouldn't happen to have the part number for the correct part? I'd like to order a set so I can update the one side when I pull the engine to adjust the valve lash. It would also be really good info to have available.

Thanks by the way.


Also, is it just me, or are those holes huge for the given purpose?

do you have the actual hole sizes between the two parts? as I wonder how much of the oil pressure loss at high rpm is down to leakage ?
I'm assuming that the later part has the smaller hole ?

[Respect BRZ]

I only read the first page of 86... But has anyone mentioned an oil accumulator? I like them for my street cars due to having oil pressure before the crank start to turn. But I know they are in use heavily in drag cars. (ie extreme g force causing oil to go away from the pickup)... Just my 2 cents.

Sent from my LG-D850 using Tapatalk

[phobos512]

Originally Posted by Respect BRZ

I only read the first page of 86... But has anyone mentioned an oil accumulator? I like them for my street cars due to having oil pressure before the crank start to turn. But I know they are in use heavily in drag cars. (ie extreme g force causing oil to go away from the pickup)... Just my 2 cents.

Sent from my LG-D850 using Tapatalk

Search this thread >> "accumulator" >> 32 hits. Nope, no one's thought of that.

[Spartarus]

Originally Posted by Respect BRZ

I only read the first page of 86... But has anyone mentioned an oil accumulator? I like them for my street cars due to having oil pressure before the crank start to turn. But I know they are in use heavily in drag cars. (ie extreme g force causing oil to go away from the pickup)... Just my 2 cents.

Sent from my LG-D850 using Tapatalk

Please.

Read.

The.

Whole.

Thread.

Before.

Posting.

OR AT LEAST SEARCH IT, NOT THAT MUCH TO ASK THANKS.

THIS NEEDS TO BE A RULE (mods, I'm talking to you.)

[Hawk77FT]

So, is it worth getting the Reimax oil pump? Read somewhere (it might've been here, I cant remember) that it pumps 1.5 more oil (due to bigger pockets??). I am tempted to change it to this and while I am at it maybe smooth out couple of galleries angle.

[jbailey8748]

Originally Posted by Spartarus

Please.

Read.

The.

Whole.

Thread.

Before.

Posting.

OR AT LEAST SEARCH IT, NOT THAT MUCH TO ASK THANKS.

THIS NEEDS TO BE A RULE (mods, I'm talking to you.)

638 post is a lot to read.

Sent from my SAMSUNG-SM-G900A using Tapatalk

[Tcoat]

Originally Posted by Spartarus

Please.

Read.

The.

Whole.

Thread.

Before.

Posting.

OR AT LEAST SEARCH IT, NOT THAT MUCH TO ASK THANKS.

THIS NEEDS TO BE A RULE (mods, I'm talking to you.)

It is (see bottom)
2) Search. These forums tend to accumulate knowledge, and so when you have a question do a simple search first. Alot of times, the best answers will be found in old threads that have gone over the topic in detail. If you can't find your answer or are still unclear, then by all means don't be afraid and post your question.
---PLEASE READ BEFORE POSTING---

[Spartarus]

Originally Posted by Tcoat

It is (see bottom)
2) Search. These forums tend to accumulate knowledge, and so when you have a question do a simple search first. Alot of times, the best answers will be found in old threads that have gone over the topic in detail. If you can't find your answer or are still unclear, then by all means don't be afraid and post your question.
---PLEASE READ BEFORE POSTING---

“To every rule there is an exception—and an idiot ready to demonstrate it.”
― Vera Nazarian

If they don't enforce them, they hardly constitute rules.

Also thank you. That damn thanks button went away before I could click it a few more times.

[Xero-Limit]

Originally Posted by Nigelr32

No way. I have no idea when the change was made, I just noticed the difference on a rebuild of my 2012 engine. I believe there were issues with the cam timing? This may be something to do with it??
I have a 2012 and a 2014, this is how I found the difference. The earlier engines have a different part no for left and right rocker posts, later they're the same.





Heres a pic of the left and right next to each other..

Good catch.

A few tidbits here as we're tearing down into a 3rd FA20 just in the last 4 weeks...

2014/07 appears to be the cutoff for when subaru had a field day and made some major changes to the FA20. Valves, valve stem seals, rocker oilers, rockers all appear to have changes right around there (though could have been in steps). We still have to measure the 3rd fa20 (15 wrx) to see where they left off there, but clearly subaru had enough reason to change around the whole head specification. While we can't speculate exactly what the reasons may be, I think it is fair to say that the later motors have had some additional input in regards to what the engineers think is a better approach.

FYI for those doing this themselves, the VIN based parts lookup is not accurate here. Valve lenghts, stem seal bore, and rocker specs need to be measured.

[solidONE]

That's it.. I'm going to trade my '13 FRS in for a '15 BRZ.

[Calum]

Originally Posted by moto-mike

Good catch.

A few tidbits here as we're tearing down into a 3rd FA20 just in the last 4 weeks...

2014/07 appears to be the cutoff for when subaru had a field day and made some major changes to the FA20. Valves, valve stem seals, rocker oilers, rockers all appear to have changes right around there (though could have been in steps). We still have to measure the 3rd fa20 (15 wrx) to see where they left off there, but clearly subaru had enough reason to change around the whole head specification. While we can't speculate exactly what the reasons may be, I think it is fair to say that the later motors have had some additional input in regards to what the engineers think is a better approach.

FYI for those doing this themselves, the VIN based parts lookup is not accurate here. Valve lenghts, stem seal bore, and rocker specs need to be measured.

I take it the installed tip hieghts have changed along with the rest of the changes?

Any chance you could post pics of the different parts so us mere mortals can see how things have changed?