[supraman_82]

What is the difference between the 5mge and the 6mge?

 

[shiva]

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but pretty much, a 6mge is a 5mge with a longer stroke crankshaft, and corresponding rods to give it 9.2:1 compression. the 6mge is a 3.0liter displacement version of the 2.8liter 5mge.

shiva

 

[DKJones96]

well later 5mge's in the cressida had 9.2:1 compression too. i wonder if you used the 6m with a later 5m head if you'd get better compression.

 

[SupraDOHC]

later 5mge's had domed piston's, early ones had flat/slightly concave tops. I put domed pistons on my early 5mge to get 9.2:1 compression so if a 6mge has flat top pistons stock(?) at 9.2:1 then adding domed would give u 9.6:1. The heads are all the same for 5m's and 6m's.

 

[Supra Bob]

I would be curious to do the actual math on that... because I don't think it would work out to a standard .4 increase going from the 8.8 pistons to the 9.2 pistons in a 6M.... but for all intensive purposes I guess thats good enough a figure to use... Just me being curious

 

[toymad]

... because I don't think it would work out to a standard .4 increase going from the 8.8 pistons to the 9.2 pistons in a 6M....

I went through the exercise myself of calculating the change in compression ratio; the 9.2 (domed) pistons on the 6M crank would give 9.8:1 or thereabouts.

 

[ma71supraturbo]

Just picked up a 6mge today.


6M's EGR is blocked off -- the stock EGR cooler bolts right on though

My 6M has a different oil pan, and oil-pump pickup. Althought the oil pump pick-up screen assembly is held in place by the same-looking flange and 5 small 10mm bolts -- and the 5M pickup won't clear the 6M pump's shaft. The 6M pump also has a larger tube too (by 1mm). The oil pan has the sump moved farther rear-ward so it doesn't appear to clear the supra's crossmember. I'm currently trying to track down a good 5m pan (threw a rod through mine), but it shouldn't be a big deal.

Oh, and the 6M has a different intake manifold (absent on my 6m though)

 

[eurosupra1]

Hi all,

I am using a 7m block same (as 6m) I have a 6m pully and gear to fit the 7m crank, but what I do need is the pistons. I want to use over sized 5m
domed (pretty sure they will fit ) does anyone know where to get them other than toyota?

Thank for any tips!
Rob
84 mkII Imported from Germany :mk2vroom:

 

[williamb82]

any machine shop can get them. the one i go to charges $40 per piston with rings. if your going to stay n/a might want to order for an 85 supra, if a turbo is in the future plans, order for an 82 supra.

also, the reason the 6m has a center sump pan is cause it didnt come out of a supra. prolly came from a cressida or a vehicle we didnt even get in the states.
william

 

[Oldskooler]

... because I don't think it would work out to a standard .4 increase going from the 8.8 pistons to the 9.2 pistons in a 6M....

I went through the exercise myself of calculating the change in compression ratio; the 9.2 (domed) pistons on the 6M crank would give 9.8:1 or thereabouts.

Given the rods of the two motors are the same length, and the 6MGE stroke is longer, wouldnt 5MGE 9.2 to 1 later models pistons pop up thru the top of the block at top dead center?

 

[SilverMk2]

The 6M rods are shorter than the 5M rods. The pistons in both engines come to the same height. The 5M domed pistons run fine in a 6M. I've run this combo a couple of years now.

 

[Oldskooler]

Ahhhhhhh I see, Thanks for the knowledge. Ross pistons wasnt sure and neither was I. I priced out some 10.2 to one pistons woth them and mentioned that combo, as I said they werent sure. Sweet, now I know!