Ugh, SR20! I think i just threw up
[before anyone calls me a nissan-hater, i owned an S15 ADM for 2yrs - 6spd turbo].
I understand wanting something fun to drive. You just finished an original restore, time for fun
With that, are there no Isuzu motors that could make this fun? Or just too hard to find parts?
There are a plethora of engines that are bolt in/near bolt in. Nakazato, search the australia bellet club....theres a rundown on pretty much every isuzu engine into bellet. Most are ridiculously easy with only minor mount mods.
First piece of advice, ditch the old OHC pushrod G series engine. Rubbish boat anchor of an engine, dont waste your time building it.
G series SOHC engines are a relatively easy fit, benifit is you get 5spd gearbox options [heaps of box's down here mate], alloy x-flow head, parts are SHIT cheap in Oz. To give you an idea, im rebuilding my turbo G161z [the z denotes the SOHC/xflow head] and just for arguements sake [to show price comparisions] i paid $80 for *brand new* Heavy duty valve springs, $45 delivered for a brand new rollmaster timing chain, pistons and rings were 100 brand new and a complete engine seal kit is $40. Hardly bank-breaking, considering a rocker cover gasket for my S15 [yes, a f*cking 4yr old car needed a rocker cover gasket amongst many other seals - all this at only 90,000km] cost me $60. $60! For a piece of cork!?!
In terms of power -
G161z SOHC, depending on year model power output ranges anywhere from 70hp to 85hp
G180z SOHC, add another 5hp
G200z SOHC [plentiful in the states im told]
I turbo'd my tired stocker and it made 160rwkw. Thats 215REAR WHEEL hp, on an engine that was on its last legs, with no internal mods, on a dyno known to read low. Compare that with my S15 which was mechanically spotless, that on the same dyno with your usual mods [cooler, more boost, $$$$$ exhaust and intake] made 175rwkw. Yay, 30yrs of technology advances, DOHC 16V head and it made only 15rwkw more! GAY!
Then youve got the later 4Z series engines - Piazza turbo [110kw/150hp], the Rodeo 4ZD1/E1 twins etc - these are availible in the states, the later two relatively easy [troopers/p'ups/luvs used these]. More headf*cking to fit in a bellet, but they fit. Without cutting half the car up or cutting 10yrs off your life.
Beauty of the 4Z/G---z engines is the following - EXHAUST, INLET MANIFOLD, GEARBOX and other critical components are interchangeable. As in, bolt off, bolt on interchange. Not ohh ive got a FWD 4AGE in my sprinter lemme just get my tig welder out and pretty much re-make the standard stuff to fit bolt on-off. Proper bolt off-on.
Then, youve got the "holy grail". The G180w/G200w.
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These might be expensive in J-land because they are sort after. For good reason.
Just under 140 flywheel hp out of the G180w in standard form. IN THE MID 70's!!!!!!!
You want the version with the forward facing plenum and the oil filter housing in the middle of the engine pointing up. Its out of an Isuzu 117 and itll bolt straight into the bellet.
My old one was out of a ZZ/R gemini, i had crap extractors, the shitty standard plenum with a 65mm throttle body, and an ancient haltech with someone that knows what their doing tuning it. End result was 112rwhp on the same dyno as above. Enough in a 900kg gemini to see me embarass an S2000. Repeatedly.
Alot of bespoke parts in this engine, but in typical isuzu fashion there is still parts sharing - ie, gearbox is the same except for the bellhousing which conveniently unbolts, same bottom end bearings as the G180/200 SOHC [under $100 brand new with thrust washers], same crank/rods as the G180/200 SOHC, same flywheel/clutch...
[F3ARED] 76 Isuzu Gemini Coupe - forged G180z, EFI, 525hp Turbo, 6years and still building...
Daily 78 Isuzu Gemini Sedan, stock G161z, Rodeo EFI, 500hp roller, 157rwkw. Fun