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engine identification

3365 Views 14 Replies 7 Participants Last post by  dogstar
i just recently bought an 85 mkII, and when i took it in to get emmissions and inspections, the guy who did it was telling me that my engine was a 3.0L. now, i know that the 85 came stock with a 2.8L, but there are no markings anywhere on mine that show it could be a 3.0L. how can i tell what the engine is? is there any way to find out if it is really a 5MGE or not?
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Your engine "could" be a 6MGE transplant - which is a Japanese import motor. Looks just like a 5MGE, but the displacement is 3.0 liters. The 6MGE was never factory installed in the MkII Supra however. On the side of the block there will be a stamp that says 6M. See image below:



Hope this helps.
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hmm, i can't seem to find that and i don't want to jack it up and look underneath. so is there any distinct differences between the 6mge and the 5mge? like.. can i just look at the engine and tell? or no? if there aren't any differences like that i'll jack it up later and check.

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i just noticed as i was looking at pictures of 5mge engines. on the intake plenium it just says "EFI". on my intake plenium, in my mkII, it says "3000". could that identify it as a 6mge?
The stamp is right next to the oil filter on the passengers side of the block
Unless someone installed a 3000 intake then you have a 6m :wink:

no7 said:
like that i'll jack it up later and check.
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i just noticed as i was looking at pictures of 5mge engines. on the intake plenium it just says "EFI". on my intake plenium, in my mkII, it says "3000". could that identify it as a 6mge?
alright, when i change the filter and oil tonight i'll look.
okay. i just changed the oil and the filter.. and what do you know. it says "6M". so that means i have a 6mge, right?

with that said, what is the difference? all that i know the engine has a crank from a 7m. (learned that from this site). is there any other information on the 6mge engine? is my car special?
Correct. The 3000 on the intake and the 6M on the block means the emissions guy was right. You have a 3.0 liter 6MGE transplanted in your car.

Your car originally came with a 5MGE installed. You have 190 hp (stock) and has 9.2:1 compression - with the additional displacement you also have a higher compression ratio vs. the stock 5MGE.
well, the 6mge makes a bit better power, about 190 hp stock, if everythings just right.
most imported ones seem to make a bit less, probably due to the octane rating, and the different ECU being used.

it displaces 3.0 liters... think the intake plenum is a bit better designed, it doesnt have the EGR system factory installed...

hmm, i cant think of any other differences.

bit longer stroke and a slightly larger bore account for the displacement change.
alright. well thanks for the info. another thing i was wondering is.. what year was the first year they made them? is there any way to tell how old my engine is?

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what octane should i use?
I have that same engine...if the engine is a good 1 that sucker should be quite fast. Its like an extra 30 hp .


I use 94 octane. I wouldn't go below 92 because of the compression.

Later
Mark
oh yeah, its really fast compared to many people i know. (except for that dumb kid with a 5.0 mustang)

anyway, thanks for the information. that means i have to get a job so i can pay for premium gas. hehe
having a job generally comes in handy when you own a car, for tune ups, tires, brake jobs.... ect ect ect...

just ask anyone here, its a 20ish year old car, things crop up that need to be fixed :)
dogstar said:
bit longer stroke and a slightly larger bore account for the displacement change.
The extra displacement comes from the longer stroke alone; the bore is exactly the same.

Also, the 6M crank is not the same as the 7M crank, but it is similar and the stroke is the same.
ah, i knew someone would catch me if i goofed that one... and here i always thought the 6m had a bit larger bore, whoops!
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