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Thread: 6MGE thread (JDM inside)
11-28-2012, 04:34 PM #1
6MGE thread (JDM inside)
To help alleviate a lot of misinformation, or at least most of it, I decided I should make a thread for and about the (in)famous 6MGE.
Starting with new newbiest of all newb information, JDM simply stands for Japanese Domestic Market e.g. did not come to the United States. This engine is a very good example of JDM, as it was only ever produced and sold in Japan and nowhere else.
The 6MGE seems to be the "unicorn" of our small little Supra engine family, although it was never factory installed in a Supra. Though the 2JZGTE is obviously the most famous, most powerful and most durable engine people have squished into their cars, the 6MGE is the rarest. It is the missing link, the gateway between two generations of M engine in the mk2 and mk3 Supra. The 3.0 liter displacement of the 7M with the lesser flowing 12 valve cylinder head. Many people prefer the lesser performing, but more attractive style 12 valve head with it's classic ribbed valve covers and unique V-shaped cam towers.
MS125 Toyota Crowns and MZ12 Toyota Soarers were the only cars to ever have this engine option.
While many sites list this engine to have an output of 190hp, this was recorded at a time where Japan was using a different hp rating method. However, it should be noted that the Toyota Crown came with a Karman Vortex style AFM, allowing for better airflow and tunability. It is guesstimated that a 6MGE on stock Supra electronics will have around 175 crank hp (no upgrades, YMMV)
Manufactured between 1984-1987
175hp/175ftlbs?? -USDM electronics, exhaust and emissions
190hp/192ftlbs?? -JDM Crown Karman Vortex AFM, electronics, exhaust, etc
3.27" bore x 3.58" stroke (83mm x 91mm)
9.2:1 compression (180psi)
The 6MGE uses the "6M" stamped crankshaft, which has less balancers than the later model "7M" stamped crankshaft, making it a few pounds lighter and revs to 6500rpm.
A 6MGE block will have "6M" stamped onto the left side of it, near the oil filter.
Another obvious visual cue would be the "3000" intake plenum, which is nearly identical to the 1984-86 5MGE intake with it's better flowing (than '82/83 5MGE) D shaped runners, but with no EGR system attached. People in smog states regularly install their OEM intakes onto the 6MGE to pass emissions, so the stamp on the block is the #1 identifier of a 6MGE
Most imported 6MGEs come with a mid sump oil pan, which needs to be swapped to your front sump 5M oil pan.
For 1982-1983 Supras, the alternator or it's pulley needs to be swapped to the newer ribbed belt style. The entire oil pump and pickup assembly needs to be swapped over also. Some small grinding my be required if the engine cannot be turned by hand afterward, generally due to a rod bolt contacting the oil pump tube union.
For 1984-1986 Supras, just the oil pump pickup tube and strainer assembly.
All Supras will need to use their original throttle body, and depending on your state's emission laws, the entire intake plenum as well, as the 6MGE's intake did not have an EGR system. Lastly, the a/c compressor bracket.
The DIY 6MGE Frankenmotor:
So we now all know that the 6MGE was only made for 3 years and only put into 2 different cars, it has been made abundantly clear recently that these engines are not readily available for importing anymore, so people have begun making their own.
Parts off a 5MGE you need:
oil pressure sending unit (next to oil filter)
5m oil pump/ pick up
5m oil pan
male to male fitting that you screw the oil filter on to (unless u wanna drop $40 on a relocating kit from summit racing)
5m motor mounts
dip stick and tube
rear timing belt cover and water pump
the suicide pipe that bolts to the back of the water pump housing that goes around the back of the block
any block off plates
fuel filter, mounting bracket
intake plenum for EGR if needed
pistons (from 82-83 are the same as stock 6M pistons, making it 9.2:1 compression, using the 84-86 pistons will bring it to around 9.6:1 compression)
Low comp piston pic:
High comp piston pic:
Also;Originally Posted by SupraFiend
Parts from a 7MGE/GTE you need:
7MGE or GTE block
By far the EASIEST engine block to use would be one sourced from a Cressida (1988-1992) as it is already front sump, so no need for drilling or swapping pumps!) (thank you RoadRipper)
7M connecting rods
6M or 7M crank (remember, the 7M crank will have all the weights and supposedly be "smoother" but won't want to rev as high as the lighter 6M crank)
7M oil pump driveshaft (it is notched for clearance, the 5M one will hit the crank)
7M front main seal
7M crank pulley bolt and woodruff key (always good to have replaced, as both get worn down over the years, about $12 from Toyota)
*note* It is HIGHLY recommended to have your parts machined, especially having the connecting rods resized and internals balanced with pulley/flywheel. A healthy cylinder head will only need minor milling to insure straightness.
There will be drilling involved, as the 7Ms were MID SUMP and we're obviously now converting it to front sump. On the front left side of the block, you will see a small, flat area that needs to be drilled out for the dipstick, and the stock one needs to be blocked off, a bolt and sealant will usually work well.
One of the most important, and frustrating aspects about this build is.... what about the harmonic balancer? Well, the 6MGE was unique in that it had a pulley with the same rib style as the later (1984-86) Supras, but fit on the thicker 3.0 liter crank snout.
a. wait it out and search for a 6MGE pulley on this forum or rinkya/yahoo japan
b. use a 7MGE/GTE pulley and forgo a/c (can be modded, see below), and most likely power steering (however some people have modified their power steering to work with this pulley)
c. have a machine shop hog out the inside of the 5MGE crank pulley, leaving VERY little metal left.... not really recommended IMO but has worked for some.Originally Posted by williamb82
I probably left somethings out, but I'm sure someone will correct me and I will edit it in.
Russ Matusevich's 9.77 sec 6MGTE
Last edited by Tanya; 12-21-2012 at 07:14 AM.
11-28-2012, 06:02 PM #2
WOW! awesome stuff!Hidden Content
Things I need
11-28-2012, 06:23 PM #3
Good work on this thread! This defiantly explains a lot in detail.Mk2 Supras - 1983 P-type ---> Akako(red child) - 1985 P-type ---> current 6mge. Rustoration needed [sold to motto1985]
Mk3 Supras -1990-->7mgte-550 wanted - 1989--->7mgte-needs clutch
11-28-2012, 08:40 PM #4
Another beautiful write up/informative post brought to this forum.
Now hopefully people with just actually read and search a little to find this and make the time spent on it worth while by not posting 10k "How to I JDM my supra wit da 6mge yo" threads.
11-28-2012, 08:42 PM #5
I vote Sticky!-Josh
1982 Terra Cotta P-Type - Sold and missed Hidden Content
1987 Supra, 7MGTE 432WHP (New Toy)
1993 Celica GTS (Daily Commuter)
11-28-2012, 09:13 PM #6
Yeah, too bad Lexusboy didn't follow his own instructions. Engine developed light rod knock right away, because he didn't move the dipstick and it ran low on oil while I drove it home. It also had a badly cracked timing belt that was ready to blow! Does the homebrew 6M bend valves with the high comp. pistons? Just don't take that webpage for gospel.
Now, since I had that 6M in my car with a 7M crank pulley, I wanted my power steering back. My contribution to this thread is 2 pics showing what you need to do to make it work again.
Also, the lower timing cover and rear timing case from an 86-up 5MGE already have the crankshaft hole enlarged (parts made to fit on both 5M/6M from the factory), so less work if you can find those parts. Also, Cressida 5MGE block already front sump, so again less work needed.Hidden Content
Dan (DragonLady's husband) *RIP Tyler (2yo son lost to cancer)
1986 P-type (Ruffian) black 6M 5 speed (formerly Lexusboy's), sitting.
1986 P type MKII 2tone night blue met/silver met. 5MGE auto, waiting for summer.
2005 Dodge Magnum Magnesium Pearl - new family car!
2000 Chrysler Town & Country - Charcoal, family/stuff hauler
11-29-2012, 08:20 AM #7
Thank you for the thread contribution guys! Hopefully more people chime in and make this more informative as possible.
My friend and I are thinking about trying the Reverse 6M on his 83 Cressida. 7M Head with 5M bottom. Maybe plus turbo.1984 Supra P-type: 5MGE/W58 Swap/4.10 LSD.
1987 XtraCab 4x4 5MGE/G54 Swap.
1987 4Runner Turbo: 22RTE/Auto.
1987 Maxima SE: VG30E/5Speed. Daily.
1990 Soarer 1GGTE/W58.
11-28-2012, 10:19 PM #8
I want to say with almost 100% certainty that my engine is non-interference, and I have the domed pistons AND a 1.2mm MHG.
Dan, any way you can get a more clear picture on your setup there? Do you have the PS alignment plate on the waterpump or are you essentially just "free balling" the PS belt from the crank to the reservoir?
As for whether Lexusboy's page is gospel or not, it is the closest I could find to an actual recipe for the frankenmotor, considering I am ADD and having to search for things that take longer than 5 minutes bore me to tears.
I imagine I will make a frankenmotor myself one day, and when I do, I will inventory all the parts needed and try to document it as well as possible, pictures and text alike. The one thing I knew I was missing but couldn't remember exactly was about the front lower timing cover plates, which ones had to be used, etc
11-29-2012, 09:49 AM #9
- Join Date
- Jan 2010
- Pittsboro, NC
Great write-up Tanya!
Sticky, Sticky, STICKY!
this one will help peoples for sure.
Has anyone mentioned the "3000" intake Plentums yet? it should be known that the "3000" intake with the "D" shaped runners are higher flow, yet NOT compatible with EGR (keep this in mind if you are in a smog state)
For those who dont already know, (you all should by now....) the "3000" is on top of the upper intake manifold where the 5m says "EFI"97 XR650L. DD / Toy.
11-29-2012, 09:56 AM #10
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