Hi guys I am doing an engine swap on my Evo 3, the thing is I bought a 4G63turbo engine from an RVR halfcut and it does not have a cam angle sensor on the head. I'm wondering what type of problems will I run into without this. How would you suggest I go about the proble, do I simply use my old head with the CAS or I take the old CAS and install it on the new engines head?

Any input welcome.

 

Are you sure that there isn't a CAS under the intake cam sprocket?

What year RVR did it come from?

 

the guy says it is a 1996 RVR, maybe I'm looking in the wrong place. But I am used to seeing the CAS on the oposit side of the intake cam(oposite cam gear) like on my original Evo 3 engine! Is there anywhere else the CAS could be located other than the "normal" position like on the picture???

 

 

You are correct, that is where most 4G63’s had their CAS in the early 1990’s. That single CAS performed two duties; it served as CAM angle sensor and CRANK angle sensor. However in 1995 Mitsu split that one sensor into two sensors; a CRANK angle sensor by the crank timing belt pulley and a CAM angle sensor.

I can only speak of this CAM angle sensor in DSM terms:

95/96 Cam angle sensor was under the intake cam timing belt pulley, so there was nothing in the “usual” CAS location. Sounds like the RVR engine that you bought.

97-99 Mitsu moved Cam angle sensor back to the “usual” CAS location, only this new CAS was much smaller and no-longer adjustable.

It sounds to me that your ’95 EVO has “1G style” CAS, in which case, you can simply use it as it was always used and not worry about the other cam and crank sensors.

Other thing to watch out for: intake manifold port size on 95 RVR motor vs. your EVO engine. If the rest of your EVO3 engine is also like 1G DSM, it will have larger intake manifold ports than the 95+ head.

There are plenty of arguments on line as which is better, I do not want to go there, but I do want to warn you to watch out for it. I have seen people put the big port 1G intake on a small port 2G head, only to end-up with 1/4” (6mm) open gap on their port (aka: the ultimate vacuum leak )

 

yeah I figured that I might run into this "slight" difference in intake port sizes so I bought the RVR engine with its original Intake. But if I where to replace the head I would go with the old head and old Intake, what do you think of this? What type of work would I need to do on the old head before re-assembling it? I would also use the original Evo 3 injectors, to keep it short I would use the whole Evo 3 Head assembly on the RVR block and bottom end! What you think?

 

First question, which engine mount scheme is used on EVO3? Where are the front/rear mounts are attached? To the engine or to the transmission?

Before I would take off the head, I would make sure that ports do not match. You want to avoid swapping heads if you do not have to. The power difference will be minimal, so I wouldn’t worry about it much. If you do change heads, do re-use head bolts (they stretch). Get a set of ARP studs.

Putting a used head on an engine is not the great idea, but if you do, make sure to check it for warping.

 

the engine mount scheme is the same on both the Evo 3 and RVR. The front mounts are on the engine and the rear mounts on the tranny.

I think I will just do the straight forward swap for now while I send the original Evo 3 head to be checked out for cracking or warping, I will wait for the head to be back before I order the set of head studs...

Thanks for your input.

 

Are we talking about the same mounts? I am referring to front/rear of the car (and not front/rear of the engine, where cylinder 1 is front and cylinder 4 is rear). My 93 Summit/LVR (US version of the RVR), has no bosses for a motor mount in the front of the car (rear of the engine). So this block can not be used on 90-94 DSMs and 91-92 Galant VR4s.

Instead, my Summit/LVR has 2G DSM style of engine mounts, where front and rear mounts are actually on the transmission. So, in total, you end-up with three tranny mounts and just one motor mount.

The reason I bring this up, is because I inadvertently sold my friend 2.4L Summit/LRV engine for use in his ’94 AWD DSM, I later discovered that it wouldn’t be a direct bolt-on.