I spend most of my time on Zdriver, But i am curently working on a LD28 for my 83 2+2, but heavy modded LD. Most of the work is still in AutoDesk lookin for the stress points before i spend the money building only for it to fail. With the rareity of these engines. it's best to do as much research as possible. the current project is:
LD28 bored to 3.0
P90 head Ported, Polished, and CC Modds
ARP head studds-largest possible
Cummins NON-TURBO Injector Pump
Injectors mounted into spark plug holes converting into Direct Injection.
T4 or equal turbo remote mounted near rear bumber.
Starting boost 7PSI
New pistions that target the compressed (about 600PSI unboosted 17:1CR) - into the injectors
I aim to have then engine running N/A before I boost. The aim of this project is mainly to see if it's possible. Also a more modern L engine for DD. Plus Diesel engines will be replaced long after the gas engine. I want my Z for alot more years to come. Hopes of higher HP and tourq, but retain the MPG boosted LD28 give. The main concerns of the start are head gasket and Fuel tunning. For unboosted I'll attempt the LD28 Injection pump. Most of the compression will have to be made in the pistons and reworked CC, As the P90 will not be able to be shaved enough.