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3.0 piston questions #504072
09/20/04 10:02 PM
09/20/04 10:02 PM
A
Anonymous OP
Unregistered

Hi guys I was looking at the importperformanceparts.net website today because I plan on doing a rebuild and I wanted to get the flatlander hypereutectic pistons, but they only list them for years 89-90 and 93-98, but years 91 and 92 are missing, aren't the engines from 1990-98 the same? Will either the years pistons work in my 1991 6G72?
Thanks for your help.

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Re: 3.0 piston questions #504073
09/20/04 10:37 PM
09/20/04 10:37 PM
pmontero  Offline
Roll Me Over
Joined: Jul 2001
Posts: 3,169
Peachtree City, GA USA
Hi,

89-92 Montero 6G72 short blocks are the same. (99% certain on this) The difference is in the upper/lower intake and the fuel injection system. SMPI vs. MPI. The lower intake has fewer sensors and the upper intake has no EGR system and fewer vacuum lines from the throttle body. Also the ISC is slightly different in the 90-91. (however the new ISC will work in the '89... I've tried it) Also, the ECU is different from '89 to 90-91. The 90-91 ECU handles the SMPI and sensor differences.

I hope this helps. Bottom line is that I'm almost positive that the pistons will work in a '91-92. (1% error to reduce my liability if I'm wrong... <img src="/forums/images/graemlins/smile.gif" alt="" />)

Powell


'87 Montero Diesel
'98 Porsche Boxster Electric
and more...
Greasology
NotPetroleum
Re: 3.0 piston questions #504074
09/20/04 11:12 PM
09/20/04 11:12 PM
A
Anonymous OP
Unregistered

Alright so the 89-90 pistons will work or the 93-98.
Or will either one work?
Also are there any parts from a different 3.0 that would fit my 1991 for better performance? Like heads, upper,lower intake, or anything like that?

Re: 3.0 piston questions #504075
09/21/04 04:03 AM
09/21/04 04:03 AM
pmontero  Offline
Roll Me Over
Joined: Jul 2001
Posts: 3,169
Peachtree City, GA USA
89-90 pistons. I'm not sure about the 93-98 since the 3.0 was DOHC and the 3.5 was SOHC and DOHC. Some folks had the intakes milled for performance but I haven't seen them around the site lately. Try www.montero4x4.com. Jason, the webmaster did some heavy duty tuning to the 3.0 when he rebuilt his.

Powell


'87 Montero Diesel
'98 Porsche Boxster Electric
and more...
Greasology
NotPetroleum
Re: 3.0 piston questions [Re: pmontero] #504076
09/21/04 04:14 AM
09/21/04 04:14 AM
D
DougH  Offline
Mitsubishi Forum Moderator
Joined: Feb 2001
Posts: 9,781
Putnam, CT
You can run pretty much any 3.00 piston you want in that block. I am running ACL pistons with hasting rings that were made for a 3.0 diamante. They are 10:1.

Don't let any one talk you into running them. You have to run hitest and the performance gain isnt all that much. Get stock pistons from the factory, just make sure you get the proper oversize.


DougH
1995 Sr. High speed dirt!
www.terminalstills.com
Re: 3.0 piston questions [Re: pmontero] #504077
09/21/04 04:23 AM
09/21/04 04:23 AM
A
AcidophilusRex  Offline
Body Damage is Cool
Joined: Apr 2001
Posts: 1,030
Grand Junction, Tarnatia
Quote
(however the new ISC will work in the '89... I've tried it)


Any reason to think that the newer ISC is superior in any way?


Moderated by  Macka, Mudraider, off-roader, PajEvo, rxinhed 

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