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Discussion Starter #1
Hey guys,

can some one tell me if there are any differences between the 92 7mgte and the 87 7M-GE cranks?

I need to know, as i will be building my forged bottom end soon, and i have a 7M-GE crank laying around from an 87.

I will be CNC-ing all the weights off of it and using a fidanza flywheel.

I think she outa spool up and rev muuuccchhhh faster!!!

thanx for any and all feedback! ;-)
 

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Just say no to Supras
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AFIK, the NA and Turbo cranks are the same. However, in '90 the crank was redesigned to be better balanced at the expense of being heavier (lower redline).
 

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Dr Wheelspin Rh.D.
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4,393 Posts
Somewhere around 89-90 the crank changed from a 6m crank to a 7m crank. Turbo and N/A had the same cranks, just the change in the years. The cranks are interchangeable, the 7m crank revs smoother.
 

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Discussion Starter #4
Ahh that explains the part # difference!! thanx!
So they were redesigned for balance only? or quality as well?

now my concern is, will the 87 n/a crank fit the 90+ GTE block?

Also, wich ones is better for durability?
 

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Just say no to Supras
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Im sure the 87 crank will be fine. Ive never heard of people having problems with the stock cranks. If you are doing a rebuild anyway, just have the crank ballanced with the rest of the short block.
 

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Discussion Starter #6
Sweet, thanx for the help guys! :)
 

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boost freak
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cranks are interchangeable.

7M crank weighs more due to double counter balances.

later cars that got the 7M crank had lower redlines (take that FWIW).
 

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Discussion Starter #9
yea.. the weights no longer matter LOL im getting my CNC machinest to cut them off.. then i will get the complete bottom end balenced..

It will REVV like no other!
 

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wastegate hose is pulled
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If he cuts the weights off then tries to balance the rotating assembly he is going to be welding them right back on. If you want an uncounterweighted crank, get a horizontally opposed engine. Or maybe weld two 7Ms together and make an H-12 LOL.
 

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Discussion Starter #15
Hey guys,

thanks for all your opinions, its really appreciated.

I will not ne cutting off the weights as of now, insted, i will just get them sharp as a knife.

the only resign that cutting off the weights ever crossed my mind was because i know of some one doing it to a 22R-TE.

But, then again, these are very different motors..

thanx again guys!
 

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25psi = 14" brakes :)
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Just looked and the builder motor I'm working on has a 6m crank in it.
Lighter but not quite as smooth eh?
 

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Go All Electric
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Crank comparisons: http://www.jblmk3.com/id145.htm

"
90 Cressida crank (top), 88 turbo crank (bottom)



87 turbo crank



91 turbo crank


Above you can see the two different cranks found in the 7M. The 6M crank that is found in 7M motors up to 89, and the newer design (like the 1jz) double counterweighted crank found in 90+ 7Ms. The newer crank weighs approximately 5 lbs. more than the 6M."

Best regards.
 
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