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Previous Thread Next Thread Print Thread Rate Thread 4JBT versus 4JGT #810422 05/08/07 06:28 PM Joined: Jan 2006 Posts: 4 Southeast US T tellicorick OP Need a Spot Can anyone tell me the difference between these two diesel engines, besides the displacement. I know the 4JB is 2.8 liters and the 4JG is 3.1 liters (I'm told and have read), but are the two blocks the same, but different displacement? Will the same transmissions bolt up? Etc? Just what is the difference? Thanks, Richard Re: 4JBT versus 4JGT [Re: tellicorick] #810423 05/08/07 07:27 PM Joined: Dec 2003 Posts: 354 Twin Cities A acy76 Mudrunner As best as I have been able to determine, the 4JG2 shares a block with the 4JB1 (which strongly suggests that the transmissions are the same) and achieves the increased displacement through bore and/or stroke changes. The 4JG2 is supposedly indirect injection, as opposed to the 4JB1 with direct injection, and as a result the heads (and internals) are different. There may also be 4JG2 engines with electronic injection control. Again, this is all an (educated) guess based on the research I've done. 1988 Isuzu Trooper LS 2.8l Isuzu 4JB1-TC intercooled turbo diesel www.dieseltrooper.blogspot.com Re: 4JBT versus 4JGT [Re: acy76] #810424 05/09/07 10:30 PM Joined: Sep 2006 Posts: 20 Canada F Fatso Need a Spot What Acy76 said sounds right. Some 2.8s didn't have an egr system, but I believe all 3.1s do. 1991 Isuzu Bighorn LWB 2.8TD 4JB1-TC Re: 4JBT versus 4JGT [Re: Fatso] #810425 05/10/07 10:23 PM Joined: Jan 2006 Posts: 4 Southeast US T tellicorick OP Need a Spot Ok, sounds right to me. So here's a stretch- would it be possible to use the 3.1 pistons and liners in the 2.8 block to get the extra liters? Just wondering. RTG Re: 4JBT versus 4JGT [Re: tellicorick] #810426 05/10/07 10:33 PM Joined: Feb 2005 Posts: 101 NZ D Dougal Wheeler There's also a 4JH1 engine. My last work had a Rodeo ute with that engine, turbo intercooled, direct injection 3.0 litre. Went okay but was obviously nowhere near it's potential. It may have an electronicly controlled pump, but a mechanical VE pump should fit. Last edited by Dougal; 05/10/07 10:36 PM. Re: 4JBT versus 4JGT [Re: tellicorick] #810427 05/11/07 03:41 AM Joined: Dec 2003 Posts: 354 Twin Cities A acy76 Mudrunner Quote would it be possible to use the 3.1 pistons and liners in the 2.8 block to get the extra liters? If the increased displacement is due to bore change alone (and assuming my information is correct) this may be possible. If the extra displacement is due to change in stroke, you'd also likely need the crank and rods. Not much information to go on. 1988 Isuzu Trooper LS 2.8l Isuzu 4JB1-TC intercooled turbo diesel www.dieseltrooper.blogspot.com Moderated by  4x4Wire, houlster, jezeric, Jim_Paget, strawmyers  Hop To Mitsubishi Forums ------  Mitsubishi 4x4 and SUV Tech  Mitsubishi Diesels  Mitsubishi ArchiveToyota Forums ------  Early Toyota Trucks  Toyota 4Runner, FJ Cruiser &...  T100 & Tundra Forum  Tacoma Forum  Toyota Tech ArchiveJeep Forums ------  Jeep Talk  Jeep TechIsuzu Forums ------  Isuzu 4x4 & SUV Talk  Isuzu 4x4 & SUV Tech  Isuzu DieselsKia Forums ------  Kia Talk  Kia Sportage & Sorento TechOff Topic Chat ------  4x4 Gallery  Off-Topic Chat  Recreational Access & Land ...  Politics4xForums ------  Outdoor Gear  General 4x4 Discussion  Tools and Fabrication  General Communications  Amateur Radio  GPS and MapsParts Bin ------  Private Party - Garage Sale  Private Party - Items wanted  Vendors, Hot Deals, Group Buys4x4Wire Back Yard ------  Suzuki Forum  AZ Crawler Crew  Cal-Nev Crew  General Ford 4x4 & SUV Forum  General Dodge 4x4 & SUV Forum  General Chevy 4x4 & SUV ForumFeedback & Testing ------  Problems, Questions, Suggestions4x4Wire Staff ------  Forum Moderators  Problem Threads Print Thread Switch to Threaded Mode 5 Excellent 4 Good 3 Average 2 Bad 1 Terrible View Profile Private Message Follow User Forum Posts View Profile Private Message Homepage Follow User Forum Posts View Profile Private Message Follow User Forum Posts View Profile Private Message Follow User Forum Posts View Profile Private Message Homepage Follow User Forum Posts View Profile Private Message Homepage Follow User Forum Posts

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