Hi ,


I ran into a dilema last night, me and my best friend we were arguing about what denomination the EVO engine has. I always thought that the engine on the EVO8 is the same exact 4G63 engine mounted on the first Gen Eclipses Turbos.
I am under the impression that the engine on the EVO is just a much modern evolutionized 4g63 engine(better valves,better cams, better fuel mapping,fuel rails, etc, etc)

He (my friend)said no, the origin of the EVO engine has nothing to do with the DSM 4G63 engine on the Eclipse Turbos.

Could somone knowledable please clarify this for us?

I owned a 1990 Plymouth laser RS turbo, a 1990 GSX Eclipse and a 1991 GSX Eclipse and when I look at my EVO MR engine they look identical other than the valve cover and the timing(on the other side)

I am the one saying that the engine on the EVO comes from the 4G63, kind of a evolutionized 4G63.

Thanks!!

 

at MIR?????

 

I might be wrong, but I believe they are the same engine and they are just turned around in the evo. Like if you look at the two engines the side the cams are on will be oppisite. That is just an easy way to see I know there are more differences. Correct me if I am wrong.

 

It is an evolution of the 4g63. It is a 4g63.

The pistons and rods from your car fit early generation cars. The Evo 4-8 had essentially the same engine with modest changes.

Alex

 

same engine or we would be calling it a 3g63

 

Except the EVOI which was powered by the galant VR-4 motor... Grassroots magazine has an excellent article on the evolution of the evo. pick it up if you can.

 

haha allllllright

 

The Galant VR4 is also a 4G63. The Evo 1 is the same as a DSM motor.

 

^^ correct. i guess i was just pointing out that the EVO motor is made to be more hopped up and the internals are a little different. But technically the same.

 

I am probably wrong so no one flame me but, I THOGHT The 4g63 motor in Japan was always more stout. It was supposed to be engineered the same design, but our motor and internals were all made in the U.S. It always seemed to me that making the eclipse faster was always more of a challenge than what the evo is.

 

Actually, the Galant motor is widely considered a better motor than the early Evo motor. It uses a more reliable 6 bolt crank which doesn't submit to crankwalk. The Evo1-3 motor has a different 7 bolt block like the 2G Eclipse and a cylinder head that has smaller runners than the Galant Engine. The Galant and 2 G made less power than the Evo1-3 because the Evos got larger turbos, 510 injectors and higher lift camshafts, larger throttle bodies and higher compression (Galant vs. Evo)

-Alex

 

Well that proves against my theory.


Although. DSM = Diamond star motors. A combination of Chrysler and Mitsu. In efforts to combine engineering a save money buy sharing parts and shist like that.
Once again, I may be wrong; but I don't think they are the same.
they were supposed to be pretty damn close but I'm sure if they could save a little money on some things they would do it buy replacing parts with what they thought was sufficient, and already on there shelves.

Not trying to argue just trying to make sense of all this.

 

ok im gonna break this down the best I can

Please note all these motors are original layout, engine on the driver side, tranny on the passenger side

1st Gen DSM turbo, has a 6 bolt crank, stonger rods, the big end of the rod is wider, comes with a 4G63T

1st GEN Non-Turbo Eclipse. Talon, Laser. non turbo, 7 bolt crank comes with a 4G63 (notice no " T " since its not turbo)

2nd GEN DSM Turbo, 7 bolt crank, prone to crank walk, 4G63T engine ***note, the internal parts from this motor, including valves, rods, crank are all identical to the EVO4-9 motor. this motor also has a slightly different and better flowing cylinder head then the 1G DSM *** Pistons are a little different due to valve pocket size and location***

2nd GEN Non-Turbo Eclipse, Talon, Laser. Comes with a 420A motor, its a Chryler motor, same as found in the older Neon.

US or JDM Spec Galant VR4 1991 and 1992 for the US models. Same motor as the 1st GEN DSM turbo, however it has a "cyclone" intake manifold. Slightly different design.

EVO I, II, III Same motor as the 2G DSM motor, except a different turbo, better flowing exhaust manifold.


Now this is when things change up a bit. Now the 4G63T engine becomes transverse, which means they flip it 180 degrees in the engine bay. So now the engine is on the passenger side and tranny is on the driver side.

EVO4-8 Transverse mounted 4G63T, same DESIGN as the 2nd GEN Eclipse engine but with improvements, better oil squirter design to eliminate the problem of crank walking. Various different cam designs, solid cams, hollow cams, different fuel mapping in the ECU. Better flowing intake and exhaust manifolds. Different turbochargers. They made improvements as each new model was released

All the 4G63T and 4G63 engines are pretty much the same design, slight updates here and there but overall the same functions, same parts, etc. Mitsu new they were onto a good thing when they built that motor, thats why hear we are 15 years later and they are still using it.

Hope this helps.

 

very well said.

 

There are so many different specs that it's tough to keep it straight. What parts do you suspect that the US versions "skimped" on? I assure you that they're the same.

Since the Galant was Japan-built it's somewhat of an exception but the DSM of the same years was identical save for the thermostat housing, Valve cover and throttle body which had a different vac line configuration.