Resolved Differences between 4g63 and 4g63t? [Merged]

[bbechtel16]

Can anyone explain to me the differences between the NA and the turbocharged 4G63 motors? The NA in question is a '91 and the turbos in question are a '90 and a '91. Thanks in advance for the help.

 

[HighPsi92GST]

difference is on the turbo block, there are oil squirters, knock sensor, and different pistons.
heads are pretty much the same except for cams
throttle body and injectors are different
and exhaust manifold of course...

 

[bbechtel16]

HighPsi92GST: Thanks for the confirmation, I thought they were the same.

 

[HighPsi92GST]

HighPsi92GST: Thanks for the confirmation, I thought they were the same.

as long as "by the same" you mean they are both 4g63 engines an basically the same thing, just with different internals, then yes.
i dont now how much you want to know about differences, usually people just ask the differences between blocks. as for the rest of the engine, water lines and oil pan are also different as the turbo pan has a hole in it for the turbo return line

 

[Gary 420A RS]

ONCE AGAIN

90-94 2.0 turbo and non turbo both have a 4g63, no 420a.
the whole post above this is junk.
and since we are talking 1gs, not 2gs, every single part is interchangeable.

thank you i was reading that post above and was like is this guy serious. it sound like he is trying to know what he is saying... ahha ! read and learn read and learn.

 

[bbechtel16]

as long as "by the same" you mean they are both 4g63 engines an basically the same thing, just with different internals, then yes.
i dont now how much you want to know about differences, usually people just ask the differences between blocks. as for the rest of the engine, water lines and oil pan are also different as the turbo pan has a hole in it for the turbo return line

So the heads are identical except for the cam specs?

 

[HighPsi92GST]

yes, the cams are all interchangeable. supposedly 90 heads have smaller passages in them or something though. It works the same either way.

thank you i was reading that post above and was like is this guy serious. it sound like he is trying to know what he is saying... ahha read and learn read and learn.

i had actually just finished posting in another thread where some one else was saying something about the 420a and the thread was also about a 1g. to a point, he was right, but no one in this thread wanted to know anything about the 420a and his post would just confuse others.

Thank you to the mod who deleted it.

 

[ekizenbe]

i was just wondering what the differences were between the 4g63 and its turbo counterpart. are the internals the same. is the compresson the same? what exactly is the difference?

 

[blueman803]

One goes fast

N/A pistons have ringlands that are further up the skirt, so they can't handle as much boost. They have a compression of 9:1 and turbo have 7.8:1 and 8.5:1 depending on generation.

The heads are the exact same. The only differences in the block are pistons and oil squirters. The crankshaft has an extra dowel for alignment. The water pipe is different. The flywheel and clutch is different. The throttle body and fuel components are different. Hmm... thats all I can think of right now...

 

[ekizenbe]

so its kool if i want to use a reg 4g63 head on my 93 4g63t motor

 

[IHeartTurbo]

The cams are different between 4g63 and 4g63t. I'll see if I can find the specs real quick.

:EDIT: Here.

Valve timing DOHC
cam ID mark (B,C) (A,A) (D,C) (E,A)

Intake valve
Opens BTDC 21" 26" 21" 16"
Closes ATDC 43" 46 "51" 48"

Exhaust valve
Opens BTDC 57" 55" 57" 55"
Closes ATDC 18" 9" 15" 9"



2.0 DOHC non turbo cam specs all years:

Intake valve opens 26 deg BTDC and closes 46 deg ABDC for a duration
of 252 deg Cam ID mark "A" 1.4 inch cam height
Exhaust valve opens 55 deg BBDC and closes 9 deg ATDC for a duration of
244 deg Cam ID mark "A" 1.39 inch cam height

2.0 DOHC turbo 5 speed up to 1994:

Intake valve opens 21 deg BTDC and closes 51 deg ABDC for a duration
of 252 deg Cam ID mark "D" 1.4 inch cam height
Exhaust valve opens 57 deg BBDC and closes 15 deg ATDC for a duration of
252 deg Cam ID mark "C" 1.39 inch cam height

2.0 DOHC turbo automatic up to 1994:

Intake valve opens 16 deg BTDC and closes 48 deg ABDC for a duration
of 244 deg Cam ID mark "A" 1.4 inch cam height
Exhaust valve opens 55 deg BBDC and closes 9 deg ATDC for a duration of
244 deg Cam ID mark "E" 1.37 inch cam height

2.0 DOHC turbo 5 speed AND automatic 1995 and after:

Intake valve opens 21 deg BTDC and closes 51 deg ABDC for a duration
of 252 deg Cam ID mark "J" 1.37 inch cam height
Exhaust valve opens 57 deg BBDC and closes 15 deg ATDC for a duration of
252 deg Cam ID mark "J" 1.37 inch cam height

 

[HighPsi92GST]

so its kool if i want to use a reg 4g63 head on my 93 4g63t motor

yes, just make sure you re use your turbo cams

 

[DJpHGotBanned]

The 1G main bearings in the non turbo are separate... in the turbo 1,2 and 3,4 are bridged. In a 2G the mains are all linked via a girdle.

The turbo oil pans have more baffelling than the non turbos... as well as the oil drain flange.

The metal used to make the internals as well as the treatments (hardening) may differ.

 

[Advan_Evo]

I was wondering how I would find out something. I bought a N/T to turbo conv Laser and I'm not sure what motor is in there, the turbo or the N/T? Is there any other way of finding out what motor I have (oil squirter location, engine code on motor) or do I have to take the motor apart to find out?

 

[lq1driver]

hope this helps http://www.dsmtuners.com/forums/newbie-forum/303988-nt-4g63-pistons.html

 

[stealth_eclipse]

ok got a question? can you turbo a n/a block if you use all turbo internals? will it be ok without the oil squirters?

 

[MrBoxx]

This really has all been covered before.

Yes, it will be fine without the oil squirters.

 

[stealth_eclipse]

even bored over? i want to make sure before i buy the block.

 

[MrBoxx]

With exception to the oil squirters, the blocks are essentially the same. So if a 4g63 block is fine with over-bored pistons, then a 4g63 non-turbo block is going to be fine with the same over-bored pistons. Are you re-useing 4g63t stock pistons, or are you using aftermarket forged pistons?

 

[stealth_eclipse]

aftermarket pistons and stock rods.

well my concern is that there maybe more friction and heat without the oil squirters and with it bored and thinner walls dont want to trash the block or pistons. now i know there are alot of other engines such as v6 and v8's that dont have them and have turbo set up but i just wanted to make sure with this block.

 

[MrBoxx]

It will be okay. Plenty of people use the NA block without the squirters in a turbocharged application. You'll be just fine. Keep oil in it, keep coolant in it, keep up the maintenance, and do things smart. If you REALLY get worried, have a machine shop drill and tap the block for the squirters. You can buy them individually if you need to.

 

[Defiant]

well my concern is that there maybe more friction and heat without the oil squirters

The jets are for cooling the piston crowns. They are not there for lubrication.

 

[stealth_eclipse]

ok thanks i just wanted someone to confirm that it is fine without oil sprayers and also being bored out. thanks.

 

[noV8undrDIShood]

adding to the whole oil squirter situation. I realize that people have turbod NA 6 bolt blocks.. what is better tho. I had an offer the other day to buy a 91 NA laser for 300 bucks.. I wantthe engine out of it and some of my buddies want to buy some parts off of it. Like i said, i know guys have turbod these blocks but then i have had a couple people tell me that you can do it but if your expecting high horspower then you usually inherit problems with cracking and such. I am going to completly rebuild this engine and dump alot of money into I just wanted to get you guys input and go from their
thanks guys

 

[willydsm]

Again oil squiters are for cooling the pistons if you go with forged pistons and a good cooling system(radiator,fans , oil cooler) you will be just fine without the squiters.