Topic: 3rz VS 2rz

[zippo]

So after weeks/months of looking for a well priced, good 3rz i am getting frustrated. But i have found several 2rz's. So what is the real overall difference? 

Engine  Valves  Displacement Horsepower   Torque        Bore......   Stroke....   Compression
2RZ-FE   4   2.4l   142@5000   160@4000   95   86   9.5:1
3RZ-FE   4   2693   150@4800   177@4000   95   95   9.5:1

8Hp and 17lb or Torque.

But what is the difference in the engine? Crank? Pistons? Block? Head? Intake?

Can one turn a 2rz into a 3rz?

Is the 2rz even worth playing with?

How about fourwheel drive with the 2rz?

LET ME KNOW!!!!

[87pickup]

2rz= Less power, less displacement, doesnt have balance shafts i think? which is good and are usully cheaper and easier to find.
3rz= depending on where your from they can be hard to find for a decent price. here in az they dont come around too often.

Never driven a 2rz swap but my 3rz is a nice improvement over my old 22rte motor. But apparently the torque difference between the 2rz and 3rz is what makes a noticable difference.

If you want as much power as possible then wait for a 3rz, but if you just want a better performing motor than a 22r then get  whatevers cheaper, more complete, lower miles,easier to find. etc.

Dont know the physical differences since they look pretty much identical
Why spend extra money to turn a 2rz into a 3rz, just wait for a 3rz if thats what you want
Lots of people have done 2rz swaps and are happy with them
Guy here in az just did a 2rz swap in his 86 4x4 and is happy with it, no reason you couldnt or shouldnt do it with 4wd.

[TacoRunner]

Dont do it, hold out.

First off, I dont know where everyone gets the idea of the peak power on these things. Every dyno I've seen says otherwise. I know exhaust mods move stuff around, but not that much. At least not that I've seen. (someone else that has seen dyno numbers should chime in here)

3RZ has 150hp at 4800RPM and 177ft lbs at 3800RPM
2RZ has 142hp at 5200RPM and 160ft lbs at 4200RPM

so its more than just peak numbers, its were the power is.

[TacoRunner]

Here is a dyno from a 2RZ comparing two different headers. But you get the point, look at where the power is made.

[TacoRunner]

And the 3RZ

[TacoRunner]

Look at this from a cruising speed perspective. 3000 RPM's on the freeway = 70mph.

2rz makes 63hp  110ft lbs
3rz makes 74hp  130ft lbs

then toss on some headers and a cam and away you go.

once you get dual cases and 4.7's you wont really notice anything, but driving at speed you will. Put it this way, with the 3RZ you'll better off for mud, sand & snow. And you cant tell me that you never feel the urge to hit the gas when you're headed back to base camp. Suck it up and wait. Do it once and get what you really want.

[TacoRunner]

Heck, if you throw on some Underground headers you get even more. Look at what I got with the blue line. Black is stock and Red is a Cam.

[Steve_925]

i was told the difference is the block height. the 3rz has a taller block so it has a longer stroke so it has more displacment.

if its trail only a 2rz isnt bad, but if your gonna be on the road then dont waste your time

[zippo [OP]]

Wow TaccoRunner thanks for the info. You shutdown the question quick! Its killing me but I will have to wait. dag nab-it.

[TacoRunner]

Cool, glad to help.

[Wainiha]

Looks like I'll have to pull this guys motor(which ever one it is) to complement my new to me W59 transmission.  hahaha.  Love free stuff. 

It's gonna be:  One motor
                        One W59 - I think two, but haven"t checked the model on the other.
                        One Transfer case. 
                        And whatever else I can unbolt.  Maybe driveshafts, R&Ps and axle shafts. 

Maybe I should drag this whole truck to my house....

[3toys]

Taco, do you have a link to the Underground header?  I clicked on your 4wheelunderground link and only saw suspension items. 

[R.DesJardin]

The RZ debate can't be and will never be solved. I hated the low end and no top end of the 22re, I love the revving top end power of my 2RZ I doubt there would be that much difference in general between the 2RZ and 3RZ the way I wheel.
I would go with what you find for a good price buy it.
 The dyno info is good but there is more to it that that. Real world use. What is your driving style? What  diff gears? What trans? Dual cases? etc. Tire size and amount of tread even. Don't forget the mentioned DD syndrome, if your truck is a street machine then the greater midrange of the 3RZ might be favorable.
I swear by the 2RZ because that's what I found for the right price and I think that's were the roots of this are.
Whichever you choose the RZ motors are a great swap. I like the 2RZ and will until I build a 1UZ setup. 

[supper]

i need documents about 2RZ engine, can you sent me: nongvanhoa1995@gmail.com
thanks all!

[H8PVMNT]

So I bumped into a 3RZ doner vehicle for a guy recently.  We were able to sell him the motor and everything for the swap and my parts guy over on the other side of the mountains is getting the rest of the rig.  We are having a bit of a time coordinating for pickup but they can be had out here in BFE Montana.  Want me to look for one for you?