Looks like it's not a 7GR, EPC partially updated: 2GR-FKS

You don't need to be a mech engineer.... All the designers at Toyota are the liberal arts majors who couldn't cut it teaching elementary school

 

Sure, and Blue T is an English major!

 

No, the 1GR only has four main bearings. You have a bearing at each end and one between each of the two paired "V" cylinders (hard to explain). All V6's will have 4 main bearings and all I4's and V8's will have five. Number of bearings isn't really relevant, its the quality that matters.

Count the bearing caps on the 1GR: 16 main bearing cap bolts on the top (4 per cap) + 8 main bearing bolts on the side (2 per cap) = 24 main bearing bolts for 6 bolts per main bearing.

 

K isn't used on too many engine codes, in fact it seems to be something new, first used on the 1NR-FKE and 2NR-FKE late last year, both of which are Atkinson-Cycle engines with VVT-iE. It seems to be Toyota's new code for switchable Atkinson cycle (used in several other engines like the Gen-II 2UR-GSE, etc.).

S used to be for swirl intake, but was only used for that back in the 70's/80's. More recently (as of 1998) it has been used for D-4/D-4S direct injection. (1AZ-FSE, 1JZ-FSE, etc.).

Interestingly, Toyota seems to have stopped using "E" for EFI on many of their new engines (8AR-FTS, 2GR-FKS, etc.).

The new engine uses 4 main bearings, just like the 1GR, just like every other Toyota GR engine (and all other Toyota V6's). In a V-type engine you almost always sacrifice the number of main bearings. An inline 6 will typically (but not always) have 7 main bearings instead of just 4 on a V-type. It's just a product of the design.

The bearing design of the 2015 and 2016 Tacoma is basically the same. The main differences you can see in those diagrams is mainly where the oil filter is (similar to the Dual VVT-i 1GR-FE on the bottom front), where the oil cooler lines are, and that they've added piston oil squirters. Beyond that not much to see there.

Jeff

 

Jesus H. Tapdancing Christ, it's a damn graduate-level Toyota engine lecture in here. How many credits is this class, prof? De we all at least get credit for auditing it?

I mean...damn. This is like, well, work.

 

I'm taking it Credit / No Credit

 

Main bearings go between the rod bearings. An I6 will always have 7 main bearings.

 

I-6 is the superior and ultimate engine setup, I think we all know that.

 

Last inline 6 I drove was an M-935. I don't think that's comparable.

 

Except it can't fit in the engine bay in most modern RWD applications. V8's actually occupy the room better because they are shorter and are also perfectly balanced just like an I6. V8's have smoother power delivery as well. All of those reasons are why the I6 is gone except for in very limited high performance applications.

 

Sideways 4 is superior to all

 

Looking at the diagram I am almost willing to bet that they are going to a cartridge type oil filter like the current Tundras and 2GR.

 

Does the cartridge go on the top or the bottom?

 

Exactly.
An inline 6 is as long (or longer) than a V12; think about it. While I LOVE the inline 6 and it's inherent balanced properties, it's just not a good engine design geometrically. Especially for a car that you'd want to turn well. A V8 is essentially two inline 4 cylinder engines mated at the crank. This means you get double the displacement AND a lower center of gravity.

 

But it's fantastic in ginormous diesels. The M-935 could pull God down off his mountain if we could only keep the tires from spinning...

 

Toyota Previa engine? I agree!

I think the American 'nuthin beats a V8!" attitude has alot to do with it. But I likes me my I-6's. I bet the M3 guys like theirs too.

 

V4

 

Not always. It's not necessary to support the crankshaft between every connecting rod in all applications. Notable Toyota example: The Land Cruiser inline-6 (Toyota F, 2F, 3F and 3F-E engine) used 4 main bearings all the way until they discontinued it in 1992. It didn't get 7 main bearings until the 1FZ in 1993.



Jeff

 

They learned real quick why this was a bad idea.