2GR-FKS after it wears out...... Can this thing be stroked?

I was just looking through the GR Wiki page and noticed that the 4.0L and 3.5L engines might be more closely related than I thought. It appears that the stroke is shorter on the 3.5L by 12mm. It just makes me wonder if the crank from the 4.0L could be placed in the 3.5L similar to stroking a 350 cu in SBC to 383 cu in (400 crank in a 350 block).

That would get you a little more torque. Of course, the computer would need to be tuned. Just a thought for the future.

Anyone know more about these that might be able to confirm?

 

I cant confirm, but what you are saying makes sense. The only thing I can think of is that the cylinder head would have to be decked at that point to accomdate a 12MM stroke increase, but that sounds pretty thoroughly doable for somebody like LCE engineering, or other known toyota engine rebuilders. Wonder if it would be just as simple as swapping the crank out from a 1GR and spacing the cylinder head out properly. Best part is you could even adjust for higher compression depending on the height of that spacer at that point. Just gotta make sure the crank out of the 1GR can take the abuse that the forged crank out of the 2gr is designed to take. Not sure if the 1GR crank is forged or not.

 

2UZ is definitely forged and I'm pretty sure the 1GR is as well.

 

I'm pretty sure all Toyota rotating assemblies are forged. Crank and rods.

 

Why would you have to deck the head? Are the pistons domed or something? I would think that if anything decking would raise the compression ratio.... pistons might need to be different since changing stroke will change CR.

Edit: I re-read what you posted. I don't think a spacer would be good.... dished (deeper if need be) pistons would be used to get the CR needed....

 

It also might end up being cheaper to find a wrecked camaro, cor

That's true a different piston would accomplish the same end goal. Something has to be done about the clearance of the piston since it's tracking 12mm further was all I was getting at

 

The piston pin location in piston would be different. In affect it would have a longer stroke or even different rod length.

 

yes thats the goal, we want a stroked 2GR

 

Lol. That's funny. I think what you want is 1GR-FE.
Had they offered the gen 3 with the 4L and without the whale mouth... I'd have bought it last year.

 

Damn you, now I'm fantasizing about a Blazing Blue Pearl TRD OR DC with a 1GR and a janky 6 speed auto.

 

That's why you would change out the whole rotating assembly.

 

No. I was talking about stroking the current engine. Might be in the future for some that are interested.

 

I wonder how the connecting rod lengths compare?

 

they are using the same block so the rod must be shorter.

 

Or the location of the wrist pin in the piston and the piston height could be different..... I know for SBCs, you could end up with a "shorter piston" for a 383 conversion.

 

Maybe some but not 12mm. Most would be from rod length.

 

So, 1GR crank, 1GR rods, custom pistons; that's not very far fetched.

 

I agree. This seems more feasible than a motor swap for those who want to keep a reliable truck. Plus you could still boost it on top of mechanical tuning as well

 

12mm isn't that far..... depends on how tall the 3.5L Piston is. The SBC scenario is almost 7mm change.

You might have to change the rod length, but all that is speculation until you actually have the measurements. I don't see why all of this isn't a possibility.... it looks like you could just swap the rotating assembly from the older engine to the newer..... Adjust tune and maybe change injectors. Might be a real possibility in the future.

 

Actually, it's the same bore. Probably just swap out the whole rotating assembly.