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4G Eclipse GT/SE Specific 3.8L V6 (6G75) Specific Forum


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Old November 9th, 2007, 07:40 PM   #1 (permalink)
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US 6G75 SOHC 3.8L MIVEC specs

Mods please sticky. This is a WIP, as I'm currently beat and will continue to improve on format- and content-wise.


BASE ENGINE SPECIFICATIONS
  • Engine Type : V type, single overhead camshaft
  • Number of cylinders : 6
  • Bore : 95.0 mm (3.74")
  • Stroke : 90.0 mm (3.54")
  • Total displacement : 3,828 cc (233.6 cu.in)
  • Combustion chamber : pentroof type
  • Compression ratio : 10.5:1
  • Firing order : sequential 1-2-3-4-5-6
  • Max output (crank) : 263 HP (194 kW) @ 5,750 rpm
  • Max torque (crank) : 260 lb-ft (353 N-m) @ 4,500 rpm
  • Lubrication system : Pressure feed, full-flow filtration
  • Lash adjuster : Exhaust side only
  • Fuel delivery system : Electronically controlled MFI
  • Ignition system : Electronically controlled 6-coil (non-distributor)
  • Lubrication system : Pressure feed, full-flow filtration
  • Oil pump type : Trochoid type

VALVE TIMING AND PROFILE
  • Intake Valve :
    Open (BTDC) :
    - 2° (Low speed cam A - lowlift)
    0° (Low speed cam B - midlift)
    +15° (High speed cam - MIVEC)
    Close (ABDC) :
    +50° (Low speed cam A - lowlift)
    +52° (Low speed cam B - midlift)
    +69° (High speed cam - MIVEC)
  • Exhaust valve :
    Open (BBDC) : +57°
    Close (ATDC) : +19°

Engine Mechanical specifications (at least those of interest to us gearheads)

Cylinder Head
  • Cam height :
    Intake :
    low A (low lift) : 33.55 mm (1.321")
    low B (mid lift) : 37.35 mm (1.4705")
    high (MIVEC) : 37.21 mm (1.465")
    Exhaust : 37.87 mm (1.491")
  • Camshaft journal OD : 45 mm (1.8")
  • Cylinder head total height (not incl gasket) : 120 mm (4.7")
  • Valve overall height :
    Intake : 109.33 mm (4.304")
    Exhaust : 113.50 (4.468")
  • Valve stem projection :
    Intake : 48.30 mm (1.902")
    Exhaust : 51.71 mm (2.036")
  • Valve seat / valve oversize tolerances (head porting) :
    Intake :
    0.3 osz diameter : 37.80−37.83 mm (1.4881"−1.4894")
    0.6 osz diameter : 38.10−38.13 mm (1.5000"−1.5012")
    Exhaust :
    0.3 osz diameter : 34.80−34.83 mm (1.3701"−1.3713")
    0.6 osz diameter : 35.10−35.13 mm (1.3819"−1.3831")

Engine Block
  • Piston OD : 95.0 mm (3.74")
  • Cylinder bore inside diameter : 95.0mm (3.74")
  • Cylindricity : 0.01 mm (0.0003")
  • Piston to cylinder clearance : 0.03−0.05 mm (0.0012"− 0.0019")
  • Cylinder block overall height (top of engine block to crankshaft centerline) : 227.9−228.1 mm (8.972"−8.980")

  • Connecting rod length : currently unknown (damn)
  • Crankshaft lobe heights : currently unknown (double damn !!!)


Anyone with any further information to add to this list PLEASE let me know and I'll append this list. This kind of information is essential to expanding our KB, and to folks such as ourselves who are looking to extract as much power from this already amazing engine. Thanks!
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Old November 9th, 2007, 09:28 PM   #2 (permalink)
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Good info! I was looking into the cam grinds but didn't find anything... where did you look?
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Old November 9th, 2007, 09:53 PM   #3 (permalink)
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Ohhh... just the good ol' Foxtrot-Sierra-Mike

And thanks for the sticky, o' Invisible Hand!
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Old November 10th, 2007, 11:10 AM   #4 (permalink)
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Do you have any of the cars Torque specs?
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Old November 11th, 2007, 02:17 AM   #5 (permalink)
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tq specs as in? bolts and nuts?
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Old November 11th, 2007, 02:22 AM   #6 (permalink)
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Quote:
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tq specs as in? bolts and nuts?

hahah yeah...

preferably for the Headers and Underbrace...
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Old November 11th, 2007, 03:35 AM   #7 (permalink)
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The M10s on the head flanges should be 33 3 ft-lb. Same with the manifold brackets.
The M10s on the downpipe bolts should be 37 6 ft-lb.
The M12s (?) on the centermember to chassis should be 61 9 ft-lb
The M10s on the front roll mount should be 43 5 ft-lb.
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Old November 11th, 2007, 05:13 AM   #8 (permalink)
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Updated. And FAWK!!! I can't seem to find any pertinent information on rod length and crankshaft lobe height.
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Old November 11th, 2007, 08:13 PM   #9 (permalink)
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I know that shit is hard to find. I look every place I could think of and couldn't find anything.
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Old November 11th, 2007, 08:43 PM   #10 (permalink)
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Weeeell... I guess we just have to get an engine and take it apart then
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Old November 11th, 2007, 09:20 PM   #11 (permalink)
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I've actually been looking for one so i could build it then drop it into the car but I haven't found one at a good price yet.
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Old November 11th, 2007, 09:27 PM   #12 (permalink)
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Yep. With ya on that one. Currently still goes for more than $1,400.
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Old February 20th, 2008, 09:33 AM   #13 (permalink)
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6G75 Rod info

Hello All, i am new to this site and thought this info might be of interest to you guys. The 6G74 and 6G75 share the same Rods. The crank main journal and rod journal diameters are also the same in both. The main difference from the 74 and 75 is the bore and stroke. Mitsu increased the 75 dipslacement by moving the piston pin up ~ 2mm, +2mm bore and around +4mm stroke. Mitsu used the 74 rod in the 75. The specs are as follows:


6G74/6G75 shared specs
152mm rod length
Main journals = 64mm
Rod journals = 55mm
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Old February 20th, 2008, 01:21 PM   #14 (permalink)
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Nooo kidding!

Thanks a bunch man! That post deserves massive eRep Info is VERY much appreciated Good to know that we still have forged rods.

So really, in essence it's just a matter of piston dimensions then. How typically Mitsu. That does make me wonder now if the only difference between the '74 and '75 cranks are the stroke / journal lengths from centerline.
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Old February 20th, 2008, 05:08 PM   #15 (permalink)
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Quote:
Originally Posted by Slippercream View Post
Nooo kidding!

Thanks a bunch man! That post deserves massive eRep Info is VERY much appreciated Good to know that we still have forged rods.

So really, in essence it's just a matter of piston dimensions then. How typically Mitsu. That does make me wonder now if the only difference between the '74 and '75 cranks are the stroke / journal lengths from centerline.
The only difference between the 74 and 75 cranks are only stroke. The 74 has 85.8mm and the 75 has 90mm stroke..
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Old February 21st, 2008, 03:03 AM   #16 (permalink)
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Dude... again you ROCK!

That makes "stroking" the '74 so much easier and cheaper then! Can we still assume that the 75 crank is also forged?
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Old February 21st, 2008, 07:04 AM   #17 (permalink)
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info

Quote:
Originally Posted by Slippercream View Post
Dude... again you ROCK!

That makes "stroking" the '74 so much easier and cheaper then! Can we still assume that the 75 crank is also forged?
That is what i am doing...74 block-75 crank..Don't know for sure if all the 74's or 75 are forged, but the 75 i ended up using is forged out of an endvor..
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Old February 21st, 2008, 12:06 PM   #18 (permalink)
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Ahhh... excellent Hey, you drive a 3000GT or Stealth?
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Old February 21st, 2008, 09:40 PM   #19 (permalink)
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Hahaha..a stealth...Hey, i need some info on the MIVEC heads and how they are operated. are they turned on by oil pressure, rpm, and/or a switch? Does anyone know how to control Mivec with an AEM? any help would be much appreciated.

thanks guys..
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Ahhh... excellent Hey, you drive a 3000GT or Stealth?
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Old February 29th, 2008, 02:30 AM   #20 (permalink)
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Oh... dude, I am SOO sorry I totally didn't see that last post. Yes, MIVEC is hydraulically engaged, and automatically. I suspect messing with variable timing... uhm "variables" on a piggyback like the F/IC or equivalent VTEC controller would give you instant access to tweaking that function. Of course if someone could actually pioneer getting the EMS installed the car that'd be perfect! Pinouts are posted all over the place - RRE has em on their website, too.
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Old February 29th, 2008, 02:39 AM   #21 (permalink)
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FYI, from the TIM:

Quote:
MIVEC has an additional switching system on the two intake valves in the conventional SOHC 4 valve engine. This switching system has two cams for the low mode having a difference between the valve-lifts and for the high mode keeping both valve lifts high. In the range of the low engine speed, the flow within the valves is enhanced by the difference between the valve-lifts. Also, the stabilization of the combustion is designed for low fuel economy, low exhaust gas and high torque. At high engine speeds, the high output due to the increment in the intake air amount is reached by increasing the open valve period and the lift.

A T-lever moves following the high lift cams and is arranged between the high lift cam and two rocker arms, in addition to the low & middle lift cams and two rocker arms that drive the two intake valves respectively. In the range of the low engine speed, the low and the middle lift cams drive each valve respectively because the wing of the T-lever moves freely. At high engine speeds, the oil pressure moves the switch-over piston within the rocker arm. The T-lever reaches the rocker arm and pushes it, and then the high lift cam lifts the both valves.

The cam switching is carried out when the torque produced in the low speed mode and the one produced in the high-speed mode crosses each other at an engine speed. An accumulator ensures oil pressure at the instant of switching and prevents switching mistakes.

The oil passage is divided into two, one for the intake rocker shaft and the other for the exhaust rocker shaft, just in front of the oil control valve (OCV). Oil is always supplied to the exhaust rocker shaft.

Oil supply to the intake rocker shaft is controlled by ON/OFF of the oil control valve (OCV) and carries out the switching for the low, middle and high lift cams.
It's the same old, same old Mitsu MIVEC design. All hydraulic RPM-controlled.
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Old May 28th, 2008, 06:13 PM   #22 (permalink)
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How many litres of oil does the gt take? A friend of mine has a '08 Lancer and says his car takes more oil than the gt eclipse 6 litres?
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Old May 28th, 2008, 06:21 PM   #23 (permalink)
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I think it's 4L
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Old June 20th, 2008, 11:45 AM   #24 (permalink)
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maybe i missed it but does anyone have exact measurments of the factory GT exhaust? thanks for the input
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Old June 20th, 2008, 12:15 PM   #25 (permalink)
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As in pipe diameter?
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Old June 20th, 2008, 12:18 PM   #26 (permalink)
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Quote:
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As in pipe diameter?
yes sir
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Old June 20th, 2008, 12:27 PM   #27 (permalink)
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It is 2.33 inches.
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Old June 20th, 2008, 12:31 PM   #28 (permalink)
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awsome thanks
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Old June 20th, 2008, 12:32 PM   #29 (permalink)
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Your welcome!
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Old June 22nd, 2008, 03:57 PM   #30 (permalink)
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Quote:
Originally Posted by Slippercream View Post
Oh... dude, I am SOO sorry I totally didn't see that last post. Yes, MIVEC is hydraulically engaged, and automatically. I suspect messing with variable timing... uhm "variables" on a piggyback like the F/IC or equivalent VTEC controller would give you instant access to tweaking that function. Of course if someone could actually pioneer getting the EMS installed the car that'd be perfect! Pinouts are posted all over the place - RRE has em on their website, too.
see and I got laughed at on another forum for askin if a VTECH controller type system would work
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Old June 22nd, 2008, 04:20 PM   #31 (permalink)
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Need to add the Injector CC Size to the list.

Someones gota figure it out first to add it to the list though. LOL
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Old June 22nd, 2008, 07:13 PM   #32 (permalink)
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Quote:
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How many litres of oil does the gt take? A friend of mine has a '08 Lancer and says his car takes more oil than the gt eclipse 6 litres?
it's a little less than 5 bottles
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Old August 26th, 2008, 11:33 PM   #33 (permalink)
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Need to add the Injector CC Size to the list.

Someones gota figure it out first to add it to the list though. LOL
Pull an injector out and get me the part number and I'll tell you it's size.
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Old September 22nd, 2008, 02:47 PM   #34 (permalink)
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Whys the injector size never available?
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Old November 3rd, 2008, 07:27 PM   #35 (permalink)
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how exactly does the mivec work is the same as vtec or is it constantly variable
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Old January 1st, 2009, 10:55 AM   #36 (permalink)
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what is the

Last edited by stts elipse; January 7th, 2009 at 09:37 PM.
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Old January 28th, 2009, 08:08 PM   #37 (permalink)
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If anyone ever needs any specs, i have All-data at work and could pull up the info.
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Old March 15th, 2009, 06:26 AM   #38 (permalink)
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Excuse my stupid question but does our car have forged pistons??

I ask this because i want to know if my car will handle 100 shot of nitrous! I'm already spraying 75 in first gear!
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Old March 15th, 2009, 11:40 PM   #39 (permalink)
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Nope - cast pistons. I'd be careful if I were you...
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Old March 18th, 2009, 01:08 AM   #40 (permalink)
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Anyone has sprayed 100 shot yet??
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