standard bore size of a 2g 4g63?

[steve-o_95_GST]

hey, i am rebuilding my 2g 4g63 engine (yes the 7 bolt) to standard specs and i was wondering what the bore size is. i did try a search but i only found specs for the 420a. also if you know could you tell me all of the bearing clearances?

thanks alot, steve

 

[blackGSX2g]

I believe the bore is 85mm, correct me if I'm wrong though.

Do you need bearing clearences for just the block, or the head too? I'd invest in a chiltons/haynes manual or the CD for all of those.

I've got a haynes with me (I'm at work), but its a 90-94 (for my 6-bolt motor) I've got the 95-2000 as well, but its in my garage

 

[steve-o_95_GST]

thanks alot man, would you be able to tell me in inches? summit racing displays the ring sets in inches instead of millimeter or could someone give me a link to a good set? i have every part except the rings so they are the only thing holding me back from starting

thanks alot, steve

 

[blackGSX2g]

http://www.buschurracing.com/cgi-bin/ez-catalog/cat_display.cgi?0X376545

They have total seal rings for $130. Not sure if those were in your price range or not, but just tell them you have standard bore. Thats assuming your keeping your stock 2g pistons and not overbore.

 

[92redman]

85mm / 25.4mm/in = 3.3465in

 

[steve-o_95_GST]

thanks alot for the help guys, blackGSX2g yea i am keeping the stock pistons

thanks again, steve

 

[steve-o_95_GST]

i found a set of total seal rings on summit racing for $115 plus i get $15 off because i just bought my gasket set from them so i should have my shortblock done by next week if all goes right

 

[steve-o_95_GST]

one more thing guys, there are 2 sets exactly the same except for the oil ring, one has 3mm oil ring and the other has a 2.8mm oil ring. what one is needed for my stock pistons? or doesnt it matter what one i use?

thanks again, steve

 

[Jafro]

From my 7-bolt rebuild experience, sizing 2g crank bearings is a nightmare. Your block has a bunch of stamps on it that represent the bore's diameter. The OEM bearings are supposed to be color coded, or numbered, but mine weren't. You reference the block stamp with the bearing markings to get oil clearances right. There are 5 different sizes of bearings available from Mitsu. You NEED to get a machine shop's help getting your oil clearances straight for a 7-bolt.

Make sure the crank and block are the same temperature when you measure them if you're trying to be precise. I think I had all of my clearances spec'd at .0015". Plastigage is crap. I can't stress that enough. Use a micrometer and a bore gauge.

 

[steve-o_95_GST]

From my 7-bolt rebuild experience, sizing 2g crank bearings is a nightmare. Your block has a bunch of stamps on it that represent the bore's diameter. The OEM bearings are supposed to be color coded, or numbered, but mine weren't. You reference the block stamp with the bearing markings to get oil clearances right. There are 5 different sizes of bearings available from Mitsu. You NEED to get a machine shop's help getting your oil clearances straight for a 7-bolt.

Make sure the crank and block are the same temperature when you measure them if you're trying to be precise. I think I had all of my clearances spec'd at .0015". Plastigage is crap. I can't stress that enough. Use a micrometer and a bore gauge.

ok ill make sure to do that, i have a friend who works for a machine shop that clould help me on this, also he is the one rebuilding my head.

but does anyone know if i should get the 2.8mm oil ring or the 3mm oil ring for my stock pistons? or doesnt it matter?

-steve