1G 4g63 NT in a 92 TSI

[Tbenner05]

I have pulled apart my 92 TSI with 85K on it and stripped the block down for a rebuild and found that there is no oil squirters. Come to find out it is a non turbo block (obviously). I would assume at some point in its life a garage replaced the engine or at least replaced with the wrong block. Car is completely stock.

Should I worry about this? Looking for opinions.

I am a firm believer that Mitsubishi or Chrysler designed it with oil squirters for a reason. Maybe it was an EPA thing? Pros and Cons of using the block. Some say the oil squirters are a liability. I guess looking for opinions on now that I am starting from scratch.

The block has R DOT on it. There is no VIN stamped in the block so I am wondering if it was a Chrysler/ Mitsubishi problem from years ago.

 

[DSMPT]

at least replaced with the wrong block

You can not be so sure about that, maybe it was the previous owner's intension. Some people prefer the non turbo block over the turbo block for some reason, including myself. If you are not doing some sort of endurance racing, it would be just fine without them. If you would boost very often, it would be safer if using forged pistons or taking a bit more PTW clearance if you use cast pistons though. Upgrading the oil cooler would be a good idea, too.

I am a firm believer that Mitsubishi or Chrysler designed it with oil squirters for a reason.

Yes but keep in mind, they designed it mainly for rally or endurance racing.

Pros and Cons of using the block. Some say the oil squirters are a liability.

Pros :
- You will never need to be worried about dropping the oil jet nozzles anymore.
- You will never need to be worried about losing oil pressure in case if the check valves get stuck open or dropped.
- You will have more oil flow to crankshaft at higher oil pressure range.
- Non turbo blocks have less possibility to be stressed out by boosting previously.

Cons :
- Less cooling effect on pistons.
- Less oiling on wrist pins.
- You will have higher max oil pressure.

There is no VIN stamped in the block

Then the block is not the original, not from factory. It has been replaced by the previous owner. IMO most likely the previous owner bought a new from a Mitsubishi dealer, or it's an imported JDM block.

 

[Tbenner05]

You can not be so sure about that, maybe it was the previous owner's intension. Some people prefer the non turbo block over the turbo block for some reason, including myself. If you are not doing some sort of endurance racing, it would be just fine without them. If you would boost very often, it would be safer if using forged pistons or taking a bit more PTW clearance if you use cast pistons though. Upgrading the oil cooler would be a good idea, too.


Yes but keep in mind, they designed it mainly for rally or endurance racing.


Pros :
- You will never need to be worried about dropping the oil jet nozzles anymore.
- You will never need to be worried about losing oil pressure in case if the check valves get stuck open or dropped.
- You will have more oil flow to crankshaft at higher oil pressure range.
- Non turbo blocks have less possibility to be stressed out by boosting previously.

Cons :
- Less cooling effect on pistons.
- Less oiling on wrist pins.
- You will have higher max oil pressure.


Then the block is not the original, not from factory. It has been replaced by the previous owner. IMO most likely the previous owner bought a new from a Mitsubishi dealer, or it's an imported JDM block.

My plan is to run forged pistons. There is no racing going to happen with the car. With the increase in the oil pressure from the balance shaft delete (still thinking about running the gsc stub on the oil pump side just to support the pump from a video inwatched from HP Academy) doni need to back it down some how? I believe it had a short block put in it. All the proper components are bolted to it. I plan on putting kiggleys regulator plate in the head.

The rods should still carry all the oil the wrist pin could ever need as far as oiling purposes.

What is your reasoning for running N/T blocks other than the stress from boosting and the possible squirter failure.

 

[DSMPT]

My plan is to run forged pistons. There is no racing going to happen with the car.

Then you will be totally fine without the oil squirters. Maybe 4032 forged pistons would be a good choice if you don't want to have loose PTW clearance.

With the increase in the oil pressure from the balance shaft delete (still thinking about running the gsc stub on the oil pump side just to support the pump from a video inwatched from HP Academy) doni need to back it down some how?

As for the race shaft vs 4G61 stub shaft, IMO this would be totally personal preference. For both some people say good but some say not. In my honest opinion, both would work. I personally have the Mitsubishi stub shaft always in my builds but I never have issue from that.
To lower the oil pressure, you can go with a softer pressure relief valve spring, shimming pressure relief valve plug or porting OFH. But I recommend to do those after you know what oil pressure you actually have in the new build. I mean better not to do blindly, especially porting OFH.

The rods should still carry all the oil the wrist pin could ever need as far as oiling purposes.

Aftermarket rods usually don't have oil jet unless you make it by yourself. The factory rods come with oil jet hole to major thrust side and have oil splash from that, too. But you still have oil splash from crankshaft hitting oil and from bearing side clearance. So I don't think generally this would a concern in wet sump unless you have too much vacuum in crankcase intensionally.

What is your reasoning for running N/T blocks other than the stress from boosting and the possible squirter failure.

Those are the reasons why I prefer the non turbo block. And if I would add one more reason, it's because sometimes it's easier to source since most of people look for a turbo engine.