Here are most of the specs on the 7A-GE in my AW11, just to explain how my engine is built and answer some questions people often have about building a 7AG of their own.  I did have a better page with lots of big photos, but in a move to a new server, I lost all my pics.  I didn't have backup copies because a few months prior we also suffered a hard drive crash.  All we have left is the leftover thumbnails found in the cache of the new HD.  What follows is the best I can do at illustrating my buildup with the images I was able to scrounge up.

I bought this car with a partially disassembled engine.  The #4 piston rings had broken, and the seller got discouraged halfway through the repair and never finished it.  I wasn't sure how I wanted to rebuild the engine, but I knew I would be doing at least rings and bearings to get it back to a reasonable state.  Since there was going to be some labor and cost involved no matter what, I also looked into 20V and 4AGZE swaps, but since I would have to pass a California smog test to even get the car in my name, I decided it should at least look stock and have all the emissions equipment attached and functional.  Building a 7A-GE was one way to get more power without attracting attention from the smog police, and it didn't cost much more than a basic 4A-GE rebuild.

The engine is a pretty typical 7A-GE in that it uses a 7A-FE bottom end with 4A-GE pistons and top end.  Swapping it into an MR2 was really pretty easy.  The cooling system changes in an MR2 are minimal compared to an AE86, and there are no electrical changes required, although exhaust can be a minor challenge due to the extra height of the block and the 7A-FE's two-piece (aluminum and steel) oil pan setup.


These are the current specifications:
Block, crankshaft. flywheel, connecting rods, oil pump, timing belt tensioner: 1994 Geo Prizm 7A-FE
Cylinder head, valves, valve springs: 1985 Toyota MR2 (bigport 16V)
Pistons, rings, wristpins: '88-'89 Corolla GT-S AE92 bigport, +0.5mm overbore
Camshafts: Web-Cam #577 in and ex.
Cam Pulleys: Homebuilt adjustable (thanks to Stan Lee)
Exhaust: Semi-homebuilt header adapted from 7A-FE header
Intake manifold: 1990+ 4A-GE 16V smallport and adapter plate (to fit bigport head)
Fuel injectors: 365cc 4A-GZE
ECU: MegaSquirt MS1/Extra
Ignition: Ford EDIS coil pack and crank trigger, coil pack driven directly from MS

Next mods:
Yamaha R1 individual throttle bodies
C160 six speed transmission
Chromoly flywheel
Miscellaneous other weird crud...


More details are available in the other sections, accessible from the Articles page.