Gen4 engine fit gen3?

@cnc97 has done the swap.

It is possible with some Frankensteining of parts.

 

Actually, lots of Frankensteining. Here's a link to a discussion about it.
Gen 4 to Gen 3, what you need to know | PriusChat

 

I don't know for sure, but @cnc97 would know. Hopefully he can give you some insight when he sees this.

 

Oh have I got a movie for you:

Swapping in a Gen 4 Prius' 2ZR Engine into the Prius v | PriusChat

Caveat: the vehicle getting the transplant is a Prius v, but it's equally applicable to any 3rd gen. This was @Ragingfit 's second transplant, and the first was to a regular 3rd gen Prius.

He retains third gen intake (with throttle body) and exhaust, and EGR system. The latter basically free-spans from the intake manifold to exhaust, without connection. A nub on the side of the donor engine needs to be cut back.

There's some modification to the engine coolant plumbing, addition of a short piece of pipe.

Another option: transplant a 2015 engine, they are the one 3rd gen year with both revised pistons and oil rings, both with the aim of reducing oil consumption problems.

Basic questions:

1. What miles on yours?

2. How's the oil consumption?

 

If he keeps the 3rd Gen EGR, won't it develop the 3rd Gen issues? I thought the EGR change was what we thought fixed the Gen 4.

 

It's difficult to bring the fourth gen EGR over, would require the fourth gen exhaust system to come over as well, or a lot of cutting and welding. @Ragingfit muses a bit on the subject, shows 3rd and 4th gen exhaust mainifolds, how they differ (at the beginning of video #8).

There might be fit issues at the intake manifold end as well, not sure. Third gen EGR is not a total disaster: periodic clean-out, say every 80~100K miles, and it's fine.

There's many reasons for swapping in a 4th gen salvage engine. Definitely foremost: they're cheap, low mileage and plentiful. Also, it's likely Toyota's likely learned some lessons regarding oil consumption, with the piston and rings with 2010~2014 3rd gen, and carried that over to 4th gen.

 

Hi. Does anyone know will Prius prime 2021 engine fit prius gen 3?

 

if it's the same engine as the regular prius, it should, but i would wait for more experienced knowledge

 

It is the same engine as the regular Gen 4 with the exception of the sprague clutch that allows the Prime to get up to 84 mph in EV. That would have to be changed out for the regular damper clutch.

 

I'm fuzzy, but does the damper need swapping anyway, you need to transfer over (or get another, if it's damaged) a gen 3 damper? @Ragingfit ?

 

Good question. I think I read about it, too, but can't remember any details.

 

In one of the last videos on the series @Ragingfit goes into detail about the damper.

 

You must put the damper that goes with the car on the engine.

 

I just performed this swap. It was a lot more modifying then I originally thought. Not recommended for the DIY’r

 

I did it on mine. I kept the 3rd gen intake, airbox, egr, oil dipstick tube etc. Basically followed Ragingfit's guide. The worst part was modifying the metal lower radiator hose pipe to be shorter. There were also some rigid metal coolant pipes that came still attached to the gen 4 engine that completely threw me off on the coolant hose routing before I removed them.

 

Hi. Finally installed 2021 prius prime gas engine into 2013 prius. Already made 3000 miles (including 2 trips 750 miles/day each) and the car runs perfect.
Things were kept:
1. Intake
2. Exhaust manifold (had to bent egr cooler pipe)
3. Some coolant hoses
4. Damper
New parts from prius prime 2021:
1. Engine
2. Egr valve
3. Egr cooler
4. Some coolant hoses
Custom parts:
1. Coolant tee
2. Handmade metal gasket between intake and egr valve, to lower down the output hole of the gen 4 egr valve pipe.

 

Interesting: post gasket hole ID? And update how it goes. Thanks.