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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 paulthepilot5 » Thu Sep 02, 2021 6:38 pm

Definitely get an advancing of peak cylinder pressures with water meth, the more meth in the ratio the more advance. It is a bad thing if already pushing the limits, this is why I don’t have advanced timing while running water meth, also running lower comp. Not sure if you follow Gale Banks or not, have a watch of his video on water meth testing with live readings of cylinder pressures. Long video but worth a watch a few times, particularly the data on peak cylinder pressure. As far as I know no one has done anything to the same level of detail with water meth.
https://youtu.be/k0oWISH5eT8

I’ll have a look into hard anodising. I’ve not had any issues with ceramic coming off on mine nor piston melting activities :lol: , but I am planning to push things a lot harder with the inline pump and surface hardening can only help. Also good to know the cheaper pistons are holding, that’s my biggest fear of running the aftermarket pistons.
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Re: 4jg1t "franken-engine"

Postby handymanny01 » Fri Sep 03, 2021 10:45 am

yeah man, Gale banks is great! ill def watch anything hes done with water meth, always open for fresh perspectives! : )
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Re: 4jg1t "franken-engine"

Postby Myarmila24311 » Wed Apr 13, 2022 5:05 pm

I am interested in converting my 4jg2 EFI to Direct Injection like you did. Awesome. Need help from you, according to what you post, I just need to buy a 4jg1 piston, 4jb1 head, 4jh1 injector, right? The others all use 4jg2 such as overhaul kits, liners and others. Is it possible to maintain the use of efi pump for this
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Re: 4jg1t "franken-engine"

Postby Myarmila24311 » Wed Apr 13, 2022 5:09 pm

The main reason for this is because of the efficiency and durability of the engine. Power from the engine is not necessary, as long as it is still standard
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Re: 4jg1t "franken-engine"

Postby geeves » Thu Apr 14, 2022 5:12 pm

I know someone that put a 4jb1 into a bighorn and used the original efi pump from the 4jg2 untill he found a good manual pump and had time to sort the wiring for the taco etc. Still went better than the 4jb1 but it was torquey down low and ran to 4k fine but no more than that. Even economy was great but it ran better still on the proper pump
Sanding your knuckles before starting work can help. That way you cant skin them
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