Does anyone know where i can purchase .040 over rings?

[MotoEclipse]

like the title says, i need to re-ring my car, and im having a Huge problem finding rings for my.o40 over... the pistons are 2g 8.5.1 comp.

 

[99gst_racer]

Any piston manufacturer that sells pistons for our cars, will have .040" ring sets.

Wiseco part number: 8600XX

 

[troppo loungo]

I assume those are stock 2g pistons. If the dealer can't get them for you (did you check a mitsu dealer?) then Look aftermarket like top line or manley. The rings need to match the pistons not only in diameter but in thickness to match the ring configuration. If that fails call up the aftermarked piston vendors for help like Ross, Arias...etc.

 

[BogusSVO]

A set of NPR rings in .040 over should do you just fine... Check a supporting vendor

 

[cpoindexter]

If you know the piston diameter in mm, then you can call any vendor just about and order them

 

[MotoEclipse]

I realize that i used 1g piston rings on 2g pistons.. is the ring height different from 1g to 2g?

 

[BogusSVO]

Ring height on the piston?

From what I have found out, the main diffrence is in the oil scrapers
All part numbers are NPR.
89-92
Part # SWM 31048-0
(1) 1.20mm
(2) 1.50mm
(oil)3.00 mm

93-94
Part # SWM 31071
(1) 1.20mm
(2) 1.50mm
(oil) 3.00mm

95-98
Part # SWM31103-0
(1) 1.20mm
(2) 1.50mm
(oil) 2.80mm

So by looking at this

89-98 all share the same thickness ring

but by the way the years are split up, 89-92 and 93-94, since the ring pack thickness is the same in all 3 placements, one of 2 things are diffrent, one being the alloy of the rings or two, more important, That the depth of the ring is diffrent, one year split being deeper into the piston than the other year

The 95-98 have a thinner oil scraper ring pack.

Do you know what year pistons you have?

 

[MotoEclipse]

they are 1995 pistons. they are the nippon racing ones off ebay.

If one of my oil squirters were pointed wrong, and on the cylinder wall, would it be possible they are shoving oil up into the top of the piston? cause this is my whole problem, it smokes but only under easy driving, and idling. under boost, its clears up perfectly.

 

[BogusSVO]

Couple things then, one that means you should have the 2.80 oil scrapers, but if like you said used the 1g 3.00 oil scrapers, they will be wedged in there and will not be doing there job like they should

Now low rpm you smoke, get the RPM up and no smoke

the oil scrapers work RPM based, and the oil squriters are pressure fed, but restriced buy oriface size so they can only flow a given amount of oil, (like a fuel pump)

So the scraper rings are working some, but not fully. so in the upper RPM they scrape more oil while the squrters are at max flow.

 

[MotoEclipse]

Well shoot. that makes perfect sense.. at least im on the right issue . my car defiantly needs rings.