4g63 vs 4g67 differences! Got 4g67 by accident!

[slowgsr]

Well guys, I am building a standard 2.0L 6 bolt. However, I pulled a NT motor from a junkyard, thought it was 4g63, had the plate on the firewall, dohc head, 6 bolt.. valve cover everything as if it was a 4g63.

pull it apart, dropped valves, no prob, I only need the shortblock. Knock the rods/pistons out at wrecker and take what I need. Off to the machine shop everything checks out good after hot tanking and magnafluxing.. and got the crank polished as well.

I order my parts for 6 bolt 4g63, and drop them off at the machine shop today, later.. He calls me and says the pistons are proper but the bore of the block is way too small, says its 81mm. I can't for the life of me figure out what I did.. The only 81mm bore block I could find for dsm was 1.8L NT SOHC that 'could' have been in that car.. 91 talon fwd nt. Heck I don't even know if that could have been in the car.

So im flustered, the head was dohc, me and my friend both sware it was. So i must have that nt dohc, 4g67. Its a 6 bolt as well.

I NEED to know if I can just have him bore it to 85.xxmm and than go on with the build, With the shortblock are there any other differences between the 4g63 and 4g67 other than just a 81mm bore vs 85mm bore?

It just sucks, I found a longblock 6 bolt with ecu, turbo, wiring etc etc all sensors and stuff for $500, and a 6bolt/4 bolt rear end laser turbo for $500 but its got a spun bearing but still runs.


Another question.. If i purchase the laser, and find out the crank is damaged, the rest of the block/caps etc should be fine If i just use the crank from the 4g67 since im doing a line hone on the mains anyways?

Any help is greatly appreshiated, Im struggling to find another option now.

 

[4g64fiero]

http://www.dsmtuners.com/forums/newbie-forum/221363-4g67-1-8-dohc-specs.html

4g67 turbo.. - Zerotohundred.com


Let me google that for you

 

[slowgsr]

it does appear I can just use the 4g67 and bore it to fit my 4g63 pistons and call it a day.

Everything else was ordered for a 4g63 as well, since they say they are both identical it should be fine as well? My oil pump housing, all gaskets, seals, waterpump etc etc that i ordered (OEM) will work on the 4g67 too I take it?

This is very good news, it makes me happy.

 

[My1GLaser]

it does appear I can just use the 4g67 and bore it to fit my 4g63 pistons and call it a day.

This is very good news, it makes me happy.

What??? 4mm is .157." People don't even like going .060 over and .080 is pushing it and you want to go double that?

I don't know man. Something isn't right. I'm too tired to look up the specs of that block but if it really is 81mm bore I wouldn't bore it to 85mm. I don't even know if you can.

 

[4g64fiero]

Its a different block that cna interchange some parts. The deck height is different. I dont think there would be enough material in the block to bore it that much. I dont have a FSM handy for a car that came with the motor though.

 

[whe3ls]

What??? 4mm is .157." People don't even like going .060 over and .080 is pushing it and you want to go double that?

I don't know man. Something isn't right. I'm too tired to look up the specs of that block but if it really is 81mm bore I wouldn't bore it to 85mm. I don't even know if you can.

if the wall thickness is there and the bore spacing is the same you should have no problem.

 

[slowgsr]

Its a different block that cna interchange some parts. The deck height is different. I dont think there would be enough material in the block to bore it that much. I dont have a FSM handy for a car that came with the motor though.

are you 100% sure that the deck heigh is different?

From what I found its the EXACT same casting, just a 81mm bore vs the 85mm, and its not about going an overbore, there is lots of meat since this block just got a smaller bore than the 4g63. If the deck heigh is different between the 4g67 and 4g63 than wouldn't they both share different length connecting rods?

Im looking for solid facts.

 

[crimsondragon]

I would have your machinist check the compression ratio. If it's too high forget about turboing it. That'll determine first if it's worth boring or not.

 

[slowgsr]

heres some info i found.. seems modifying the 4g67 is more popular over seas... where the do 2.3L strokers by boring it to 85mm and using the 4g64 crank just like we do with the 4g63.

--------------------------------------------------------------------------------

Ok guys,
Actually my frenz & i are doing some "ROJAK" for this 4G67 block.So,i will try my best to write down some information that i get during prepare this "ROJAK".hehehe
Sorry if my write are not clear enough to make u all completely understand..

After dismantling n take a close look at both VR4 4G63 & 4G67 block...i decided that
there are only 2 major difference between this block.
First : Bore size
Second : Oil squirter
Other part inside & outside block are same part eg: rod,crank,oil line n etc.

VR4 has a larger bore size compare to 4G67(of course laa 1.8 small..2.0 big..hehe)
And for the oil squirter,4G67 doesn't come with this part.So,take out the squirter from VR4 block.it will be use in 4G67.
Below are a few photo that i took during the "diagnosis"..

You must be logged in to view this image or video.

In order to make it alive as turbo block,some engineering work need to do.First,rebore block.This matter is according to your piston size that u are going to use.For me,i'm decided to use 4G63 EVO3 piston.Secondly,at the bottom of the 4G67 block..U must drill n make a taping hole at the block.(Hole size..i'm not sure,but u can measure from the oil squirter bolt).Refer below photo for the comparison between this 2 block.




One more thing is..both crankshaft got a diffrence also.VR4 crankshaft more heavy than 4G67 crankshaft..This is due to small 8 or 10 hole(not sure) on the 4G67 crank..u can see the diff in below photo..



It's up to u wether want to use 4G63 crank or 4G67 crank..u decide.

OK la bro...tired typing..hehehe
Hope it's help!!

Good luck on your experiment of making "ROJAK"...

P/S : THIS IS NOT A LESSON AND THIS IS ALSO NOT A MAJOR MODIFICATION FOR RACING & DRAG PURPOSE!!PLEASE UNDERSTAND THAT I'M ONLY SHARING THIS INFO FOR THOSE TURBO ENTHUTIAST OUT THERE...

4g67 turbo.. - Page 2 - Zerotohundred.com

 

[suprasalas]

so hey man did you ever bore it out to 85.5mm?