6G72 in 2000 Eclipse GT & VR-4 Twin Turbo. What are the differe

[jocollins]

What is the difference in these two engines? other than the twin turbos and MASSIVE HP and TQ differences?

Building the N/A 6g72... the twin in the VR-4 is a powerful one, and prospects look good for the 6G72!

Eclipse GT (2000): 205 HP 6G72 3.0 L 24v V6 SOHC -N/A (nasp)
3000GT VR-4 : 321 hp 6G72 3.0 L 24v V6 DOHC -twin turbo

• Ie: what cc injectors?
• pistons?
• compression ratio?

Basically... What are the differences?? in these two engines, and how they were manufactured? Especially parts for strength (con rods, etc).

Both are the 6G72.

 

[obi_waynne]

I've moved this to the Mistubishi thread. Hopefully Countrybumpkin will spot it, he is our resident Mitsubishi nerd.

Off the top of my head the Pistons and compression ratio will be quite different between the two engines.

The heads are also quite different with one having single and the other double cams. It may be possible to swap the heads if the blocks are the same.

Were you thinking of turboing your block?

 

[jocollins]

Yeah. Hopefully.

I have been wanting to turbo this engine, then I came across the VR-4.

The VR-4 seems pretty impressive, and it looks like the same basic setup to work toward for the 6G72 engine I have.

I just want to be sure to get it right without upgrading where needed, resulting in a alot of power,
then a Big BOOM!

So, I am trying to do a good deal of research BEFORE I start tearing into it.

Do you have any idea of the compression rate/ piston size/ or other measurements for the VR-4 engine, or where I can get that and/or other info..?

Thanks alot.

 

[jocollins]

Ok I found this:

But as you can see, the compression ratio is missing. Also this does not help with determining which engine parts are used.

I guess I could manually check a parts dealer such as NAPA or any part store online, but would this be an acurate way, or a waste of time??

I quote from:
<http://www.carfolio.com/specifications/models/car/?car=12012>

engine

1994 Mitsubishi 3000 GT VR-4See all Mitsubishi modelsBore × stroke91.10 mm × 76.00 mm
3.59 in × 2.99 inCylindersV-6Displacement3 litre
2972 cc
(181.363 cu in)TypeDOHC
Key: SOHCSingle overhead camshaftDOHCDouble overhead camshaftOHVOverhead valvesTSTwo strokeSVSide valvesSlSleeve valvesoiseOverhead inlet side exhaustSee more...
4 valves per cylinder
24 valves in total ConstructionSumpCompression ratioFuel systemMaximum power
(SAENet)324.4 PS (320.0 bhp) (238.6 kW)
@ 6000 rpmSpecific output107.7 bhp/litre
1.76 bhp/cu inMaximum torque
(SAENet)427.0 Nm (315 ft·lb) (43.5 kgm)
@ 2500 rpmbmep1805.5 kPa (261.9 psi)Specific torque143.67 Nm/litreMaximum rpmManufacturerMitsubishiCodeMain bearings4CoolantWaterBore/stroke ratio1.2Unitary capacity495.33 cc/cylinderAspirationTurbo
engine

1994 Mitsubishi 3000 GT VR-4See all Mitsubishi modelsBore × stroke91.10 mm × 76.00 mm
3.59 in × 2.99 inCylindersV-6Displacement3 litre
2972 cc
(181.363 cu in)TypeDOHC
Key: SOHCSingle overhead camshaftDOHCDouble overhead camshaftOHVOverhead valvesTSTwo strokeSVSide valvesSlSleeve valvesoiseOverhead inlet side exhaustSee more...
4 valves per cylinder
24 valves in total ConstructionSumpCompression ratioFuel systemMaximum power
(SAENet)324.4 PS (320.0 bhp) (238.6 kW)
@ 6000 rpmSpecific output107.7 bhp/litre
1.76 bhp/cu inMaximum torque
(SAENet)427.0 Nm (315 ft·lb) (43.5 kgm)
@ 2500 rpmbmep1805.5 kPa (261.9 psi)Specific torque143.67 Nm/litreMaximum rpmManufacturerMitsubishiCodeMain bearings4CoolantWaterBore/stroke ratio1.2Unitary capacity495.33 cc/cylinderAspirationTurboengine

1994 Mitsubishi 3000 GT VR-4See all Mitsubishi modelsBore × stroke91.10 mm × 76.00 mm
3.59 in × 2.99 inCylindersV-6Displacement3 litre
2972 cc
(181.363 cu in)TypeDOHC
Key: SOHCSingle overhead camshaftDOHCDouble overhead camshaftOHVOverhead valvesTSTwo strokeSVSide valvesSlSleeve valvesoiseOverhead inlet side exhaustSee more...
4 valves per cylinder
24 valves in total ConstructionSumpCompression ratioFuel systemMaximum power
(SAENet)324.4 PS (320.0 bhp) (238.6 kW)
@ 6000 rpmSpecific output107.7 bhp/litre
1.76 bhp/cu inMaximum torque
(SAENet)427.0 Nm (315 ft·lb) (43.5 kgm)
@ 2500 rpmbmep1805.5 kPa (261.9 psi)Specific torque143.67 Nm/litreMaximum rpmManufacturerMitsubishiCodeMain bearings4CoolantWaterBore/stroke ratio1.2Unitary capacity495.33 cc/cylinderAspirationTurboengine
1994 Mitsubishi 3000 GT VR-4

See all Mitsubishi models​

Bore × stroke
91.10 mm × 76.00 mm
3.59 in × 2.99 in
Cylinders
V-6
Displacement
3 litre
2972 cc
(181.363 cu in)
Type
DOHC
Key:
SOHC
Single overhead camshaft
DOHC
Double overhead camshaft
OHV
Overhead valves
TS
Two stroke
SV
Side valves
Sl
Sleeve valves
oise
Overhead inlet side exhaust
See more...
4 valves per cylinder
24 valves in total
Construction
Sump
Compression ratio
Fuel system
Maximum power
(SAENet)
324.4 PS (320.0 bhp) (238.6 kW)
@ 6000 rpm
Specific output
107.7 bhp/litre
1.76 bhp/cu in
Maximum torque
(SAENet)
427.0 Nm (315 ft·lb) (43.5 kgm)
@ 2500 rpm
bmep
1805.5 kPa (261.9 psi)
Specific torque
143.67 Nm/litre
Maximum rpm
Manufacturer
Mitsubishi
Code
Main bearings
4
Coolant
Water
Bore/stroke ratio
1.2
Unitary capacity
495.33 cc/cylinder
Aspiration
Turbo

 

[obi_waynne]

Wouldn't it be a lot easier for you to source a VR4 engine and drop this in. As the block dimensions are presumably the same you should have no trouble. Then all you have to focus on are the electrics and whether the gearbox can handle the power. (Bear in mind that the VR4 gearbox is for a 4x4 IIRC.)

 

[Country Bumpkin]

I'm currently at work ans busy. When i get time i'll read it thoroughly and update where needed. :bigsmile:

 

[Country Bumpkin]

The compression ratio for the T.T. engine is 8.0, on the N/A it's 10.0.
The engine blocks and heads are identical externally but internally are nothing alike. The pistons are obviously different due to turbo v n/a demands and obviously this is where the difference in compression ratio is found. The T.T. pistons having a dished top for lower compression, the n/a having a domed piston to raise the compression.
In the States the VR4, 3000GT T.T. is the same thing, there are many variants of this which also include the Dodge Stealth. In Japan it's a GTO and they're all powered by the 6G72 lump.
If you look at my phots you'll see the T.T. engine in one form of being modified.