4jg1t "franken-engine"

[handymanny01]

The build is finally complete! 4jg2 direct injection conversion.. just cause I wanted to see if it resulted in the ideal Isuzu engine! 4jg2t block , crank, rods, 4gj1t direct injection pistons with hard anodised crowns, 4jb1t direct injection head, 4jh1t injectors, and 4jg2 pump modded with 12mm head and Toyota direct injection cam plate, Initial impressions are good, starts with zero glow plugs, Good torque, Def down on horse power compared to the modded 4jg2, but there is more tuning to be done yet,, Running 22lb boost, egt is low at 550 , Many many pics to follow!

[mh1989]

Wouldnt it just be easier to use a 4jh1?

[handymanny01]

It's the common comeback to the 4jg1 conversion,, reality is, it's just not that easy, as 4jh1 is electronic pump ,gear drive,,, if you've already got a 4jg2, "dropping in" a 4jh1 is actually kinda hard, You need a direct injection belt drive pump, belt drive front cover, gearbox plate, and LOADS of other bits,, plus a decent 4jh1 used engine,, (expensive) Ultimately I'll be building a 30lb boosted 4jh1 for the MU, but in the mean time,, building a direct injection 4jg1t out of standard parts was actually pretty economical, and teething issues aside has been pretty successful!

[handymanny01]

Piston masking for hard anodise

[handymanny01]

Con rod bush fitting

[handymanny01]

Cam sprocket hub , speedy sleeve fitting

[handymanny01]

New liners in block, new pistons in!

[handymanny01]

Machining out the valve seats, and tidying up ports in head

[isuzurob]

Your engine looks good, I have built 4, 4jh1t engines now all running over 30psi, they go ok but not power houses

[handymanny01]

Hey Isuzu Rob! Thanks,, looks good, but not performing as I'd like just yet,,, 100kw at wheels, 360nm, both at 2700rpm, so heaps to come if we can get it to inject properly,,, There is def a compatibility issue , either with the 4jh1 injectors and 4jg1 pistons,, or possibly in the custom pump,,, What sorta pump and turbo Combo are you running?