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engine combination possibilities

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engine combination possibilities

Postby superturbocompound » Wed Feb 13, 2013 9:10 pm

i just managed to get a hold of some parts catalog and noticed that the 4jg2 and the 4jh1 share the same bore(95.4mm) , this would make it possible to have a 3.1 direct injection by using the 4jh1t pistons and liners ,the other items that i thnk needs changing would be the head(direct injection head) fuel pump , fuel lines and injectors, all of which i think can use the 4jb1t components,300cc increase....comments please
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Re: engine combination possibilities

Postby superturbocompound » Wed Feb 13, 2013 9:44 pm

300cc increase compared to the 4jb1 i mean
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Re: engine combination possibilities

Postby geeves » Thu Feb 14, 2013 1:44 pm

I wonder how much fuel you can squeeze through those injectors?
Isuzurob is running a detuned 3.1 pump on his 2.8 so the 3.1 pump would still work which makes it a little simpler.
Without looking at the fine print it sounds like it should work
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Re: engine combination possibilities

Postby Roderunner » Thu Feb 14, 2013 6:53 pm

Nothing is ever that simple, but it would make an interesting project ! I would expect to run into problems concerning piston pin height, conrod length, liner interference fit differences etc., wouldn't a complete 4jh1 be a better engine anyway?
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Re: engine combination possibilities

Postby geeves » Thu Feb 14, 2013 7:26 pm

isnt 4jh1 3.0 litre. If this is the case then only the stroke is different. A crank change might also work.
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Re: engine combination possibilities

Postby superturbocompound » Thu Feb 14, 2013 10:03 pm

judging by the pdf file , 4jg2 is some what different from the 4jh1,piston pin is smaller 34mm(4jg2) 31mm 4jh1,so roderunner is right about this not being easy,but lets see the similarities
1) the cylinder grade from the manual are identical for both 4jh1 and 4jg2 (from the 4jg2-4jb1 manual)
2) 4jh1 piston bowl looks similar to the newer 4jb1 type piston injectors should work.

i need to drop by my friends parts shop to measure the piston pin height, he's got both 4jg2 and 4jh1 i think.

Roderunner wrote:Nothing is ever that simple, but it would make an interesting project ! I would expect to run into problems concerning piston pin height, conrod length, liner interference fit differences etc., wouldn't a complete 4jh1 be a better engine anyway?


buying a 4 jh1 engine is expensive, and alot of us either have a 4jb1 or a 4jg2 laying around some where, so its just a possibility that could happen.a 4jh1 also runs an ECU which makes it alot more complicated.
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Re: engine combination possibilities

Postby superturbocompound » Fri Feb 15, 2013 1:25 am

got a call from the isuzu parts shop(a friend of mine) that its a waste of time...just get a 4JG1 pistons and the jobs is done,piston pin size and pin height is identical to 4jg2 but with a combustion bowl for direct injection...oh well
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Re: engine combination possibilities

Postby geeves » Fri Feb 15, 2013 1:23 pm

Ive heard of 4jg1 parts but never ever seen a reference to a 4jg1 engine. Is this a mythical beast of the same nature as a 4.88 diff?
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Re: engine combination possibilities

Postby MUVIT » Sat Feb 16, 2013 12:49 pm

so will a 4jg2 accept a 4jg1 head & pistons?
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Re: engine combination possibilities

Postby isuzurob » Sat Feb 16, 2013 3:01 pm

4jg1 were very rare are a few in taupo, more in elf trucks than bighorns, holden dealers can get new parts for them still
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Re: engine combination possibilities

Postby geeves » Sat Feb 16, 2013 6:03 pm

how do they compare as a motor. Everything I can find online suggests an industrial motor
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Re: engine combination possibilities

Postby superturbocompound » Sat Feb 16, 2013 7:59 pm

geeves wrote:how do they compare as a motor. Everything I can find online suggests an industrial motor


so is the 4jb1,

Apparently a few 4jb1's and 4jg2's have benefited from this set up done by one mechanic here,my friends shop has sold more then 10 sets to this person,so this guy must know the how things are put together .

i dropped by the parts shop today to take some photos but my friend was out so some time next week i'll drop by again.
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Re: engine combination possibilities

Postby superturbocompound » Fri Mar 27, 2015 1:24 pm

Image
Image
Image

FINALLY!!!! got the pics and measurements, bore is 105mm, 3mm bigger then the 4jb1, bowl shape is a late model direct injection type so nozzle has to be changed...and the best thing is that the pin sits 2.5 mm higher meaning the 4jg1 piston is 2.5 mm lower then the 4jb1 , so can use the 4jg2 crank which has a stroke of 107 as compared to 102 on the 4jb1...do the maths 107mm-102mm = 5mm /2 = 2.5mm so the off set suits the 4jb1 block....looks like a plug and play aside from reboring the cylinder...doing a conversion now so will update from time to time...
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Re: engine combination possibilities

Postby dani4jb1t » Fri Mar 27, 2015 1:45 pm

geeves wrote:Ive heard of 4jg1 parts but never ever seen a reference to a 4jg1 engine. Is this a mythical beast of the same nature as a 4.88 diff?



Early versions of Ingersoll Rand 185 cfm portable air compressors runned with 4JG1 engine (newer ones comes with John Deere)...Also we can find these engines in some boats, generators, bobcats, mini excavators (kubota)....although I never seen turboed applications.
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Re: engine combination possibilities

Postby dani4jb1t » Fri Mar 27, 2015 1:49 pm

superturbocompound wrote:Image
Image
Image

FINALLY!!!! got the pics and measurements, bore is 105mm, 3mm bigger then the 4jb1, bowl shape is a late model direct injection type so nozzle has to be changed...and the best thing is that the pin sits 2.5 mm higher meaning the 4jg1 piston is 2.5 mm lower then the 4jb1 , so can use the 4jg2 crank which has a stroke of 107 as compared to 102 on the 4jb1...do the maths 107mm-102mm = 5mm /2 = 2.5mm so the off set suits the 4jb1 block....looks like a plug and play aside from reboring the cylinder...doing a conversion now so will update from time to time...



As always Conrad doing brilliant projects, hurray!! ....cannot see the pics though...
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Re: engine combination possibilities

Postby superturbocompound » Tue Mar 31, 2015 12:20 am

ImageImageImageImageImageImageImage

hmmm... abit confusing here, the 4jg2 blocks is taller by 4mm....the pistons of the 4jg2 is identical in height to the 4jg1...which is 2.5mm lower then the 4jb1...maybe the rods are different? pistons protrusion are almost identical...any ideas???
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Re: engine combination possibilities

Postby Roderunner » Wed Apr 01, 2015 9:51 pm

Why not use the 4jg2 block, crank, rods, 4jh pistons and 4jg1head....if you can find one that is!
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Re: engine combination possibilities

Postby superturbocompound » Thu Apr 09, 2015 2:43 pm

reason not to use another engine block is when an engine is changed here, the car loses its 'GREEN' status hence 50% off the road tax...

progress report:-

Image
the 4jg2 crank is in with its extra 5mm stroke....
Image
and this is how much it protrudes out of the engine block...so this configure is with the 4jb1 rods and pistons(4jb1 sits 2.5mm higher)...
Image
there is about 3mm piston protrusion...2.5mm lower if it were the 4jg2 piston...so i think this will work....cranks spins freely not hitting anything (for the moment, dunno what happens when fully assembled)
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Re: engine combination possibilities

Postby Roderunner » Thu Apr 09, 2015 9:56 pm

superturbocompound wrote:reason not to use another engine block is when an engine is changed here, the car loses its 'GREEN' status hence 50% off the road tax...

We don't have that kind of road tax system here in Aus. If tax wasn't an issue would using the 4jg2 block be easier? I didn't quite follow the piston differences between the 4jg2 and 4jg1.

progress report:-
there is about 3mm piston protrusion...2.5mm lower if it were the 4jg2 piston...so i think this will work....cranks spins freely not hitting anything (for the moment, dunno what happens when fully assembled)


So is the 4jg1 piston going to protrude .5 m.m. out the top of the block?
Thanks for updating, this is an interesting experiment!
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Re: engine combination possibilities

Postby superturbocompound » Fri Apr 10, 2015 12:09 pm

Roderunner wrote: I didn't quite follow the piston differences between the 4jg2 and 4jg1.

the 4jg2 and 4jg1 are identical in height...

Roderunner wrote:So is the 4jg1 piston going to protrude .5 m.m. out the top of the block?


its about that...was going to use a dial gauge but the battery was flat(digital)...

from what i see....to convert the 4jg2 to a direct injection...head change , fuel pump nozzle(maybe fuel pump), head gasket(4jh1) pistons...(off hand)
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