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4jg1t "franken-engine"

Share and discuss mod ideas here that make your Isuzu safer, faster, more homely, more user friendly or just crazier! The best from here will be made into a full DIY write up for the FAQ and DIY mod section.

Re: 4jg1t "franken-engine"

Postby handymanny01 » Fri Jan 17, 2020 10:33 pm

Ummm, you sure your egt isn't in Fahrenheit? That would be 650c, which sounds bout right,,, 1200 degrees c is almost twice the melting point of your piston alloy,,, forged or cast, What did you do to the td04 to "high flow" it? What's the compressor wheel size? I've seen an upgrade td04 available form kunigawa , but didn't see specs on the wheel sizes... all info is good info! :D
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Re: 4jg1t "franken-engine"

Postby geeves » Sun Jan 19, 2020 6:12 am

Steel often melts at around 1370 degrees C
Not much of a safety margin
Melting Points
Metals Fahrenheit (f) Celsius (c)
Iron, Wrought 2700-2900 1482-1593
Iron, Cast 2060-2200 1127-1204
Iron, Ductile 2100 1149
What sort of cast iron is used for the manifold? Might explain that small drip
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: 4jg1t "franken-engine"

Postby isuzurob » Sun Jan 19, 2020 8:16 am

Its cooler on top of the piston with water and oil sqirters, manifold is just raw heat, and yes its 1200 degrees Celsius with a vdo gauge not cheap rubbish, at 600 it's slow as anything as I said fuel=power and that's what I aim for, from memory turbine wheel is 11 blade and compressor is 12/6 blade and 63mm/48mm, that's off the top of my head, everyone says 650 is safe when talking to tuners but no one really knows what things can handle, as I said 2 years of absolute abuse at 1200 degrees c and punched the guegon pins through the pistons, tops are like new
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Re: 4jg1t "franken-engine"

Postby handymanny01 » Sun Jan 19, 2020 8:37 am

"Drip" haha, nice one Geevs! :lol: Maybe it's a mis labeled gauge? Who knows..
*update on 4JG1* Fitted 4jb1 injectors on weekend, So have gone from 5 hole nozzle @ 154 degrees spray angle, to 4 hole nozzle @ 144 degree spray angle... MUCH happier engine now! Torque is good as before, but the grey smoke has cleared up now, good power , revs out nicely, and generally sounds better,, Will still be trying other nozzles and pump set ups, so stay posted!
handymanny01
Isuzu Baby
 
Posts: 38
Joined: Tue Jul 12, 2016 9:39 pm
Age: 43
Country: NZ
City: Wellington
Vehicle: Isuzu MU 3.1 Vf10 hybrid, ported wastegate, mild port head, custom pump, 3"dump and system, 3" inlet / pod filter, EGR delete, 2" body lift, 2" (ish) suspension lift, 33" on 15" steelies , recaro seats, nardi wheel,,, rear LSD , front "lokka"

Re: 4jg1t "franken-engine"

Postby handymanny01 » Mon Jan 20, 2020 6:37 pm

Dyno run with the 4jh1 injectors ... you can see the solid hit of power and torque,,, then it just can't burn the fuel properly,,, Will book a dyno run with the 4jb1 injectors and post results,,, expect to see much better result! ,,,, (sorry, pic is kinda fuzzy) red and green runs are 4jg1, the blue line was the old 4jg2 on 20lb and maxed out standard pump ,,,
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handymanny01
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Posts: 38
Joined: Tue Jul 12, 2016 9:39 pm
Age: 43
Country: NZ
City: Wellington
Vehicle: Isuzu MU 3.1 Vf10 hybrid, ported wastegate, mild port head, custom pump, 3"dump and system, 3" inlet / pod filter, EGR delete, 2" body lift, 2" (ish) suspension lift, 33" on 15" steelies , recaro seats, nardi wheel,,, rear LSD , front "lokka"

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