9age
238hp @8000rpm and 175 ft/lb at 6000rpm
238hp @8000rpm and 175 ft/lb at 6000rpm
So you've herd of the mythical 9age. The first thing you should know is it's not a factory Toyota engine. A 9age is a hybrid of sorts that takes parts from three different engines and custom-made parts. The end result is a 1.8 or 2.0 naturally aspirated (NA) engine liter engine that makes over 200HP and 180ft-lbs of torque. (TQ) There is not much information on the 9age because there have only been a few people who have made one. This is my attempt to gather that information in one place. I hope this helps to answer your questions about the 9age.
Now that you know what a 9age is and how much power it can make you're probably asking why they are not more common. The answer is there not easy or cheap to build. To build a 9age you need parts from 4age (16v/20v), 7afe block, 1zz/2zz crank, 2zz connecting rods (con-rods), and custom pistons. For this guide, I'm going to assume you already have a stock 4age 16v and we will start building from there.
Engine Build Chapters:
1: The Head
2: The Block
3: The Crank
4: Connecting Rods
5: Pistons
6: Electronics
7: 9agte/9agze
8: Install
9: Extra Info
1: Head
If you use a 16v head you will have a stock-looking engine but a few things should be done to prep the head.
When going from 1.6L (1588cc) to 1.8/2.0 L (1839.6cc/1980.3cc) of displacement the engine head will be trying to fill more space in each of the cylinders. On the 16v head, you might want to go with 1mm bigger valves and/or bigger cams. Another way to flow more air into the bigger cylinders would be to use a 4age 20v head. The increased flow from the head will help the engine fill the bigger displacement. If you live in California you might want to stick to the 16v head as it will look stock when finished. If you don't have CARB to deal with I would go with the 20v head over the 16v. The downside of using a 20v head is you also have to use 20v electronics or some kind of standalone fuel system. A Blacktop head is said to flow better than the ST but either should be fine. Also, the valve stem seals should be replaced and the head should be resurfaced since you have the head off already. Also, you can take this time to get the head cleaned.
2: Block
A 9age is a lot like the more common 7age in that it uses a 4age head and a 7afe engine block. The main difference between the two hybrid engines is that the 9age makes use of different internals that push displacement to the 2.0L mark. The block needs to be machined in order to fit these bigger parts. The 7afe's most common application was in the Toyota Corolla (1993? 1997, AE102) well as in the ST version of Celica (1994? 1999, AT200) as well as the Toyota Corolla's clone, the Geo Prizm.
There is only one thing that needs to be done to the block to make a 9age. For the 1zz application, the walls of the block need to be ground so that the crank counterweights can spin without hitting the sides or the crank mounting points. You have to have the center of the crank machined to clear the 7afe block (journal to counterweights area). The 2zz only needs the crank machined as the crank's throw is 85mm. The stock stroke for a 7afe is 85.5 so the 2zz will not hit the sides of the block.
The block should be resurfaced along with the head for proper seating of the head gasket especially if you're going to use a metal head gasket. Also, take into consideration replacing all the freeze plugs.
If you want the 2.0L you will also have to bore the block out to 83mm and use 83mm pistons.
83mm bore + 91.5 stroke = 1980 cc or 2.0 liters.
Here are the specifications of the different blocks and engine information:
7AFE
81mm Bore X 85.5mm Stroke
Rods length 132.5mm
Block height 206mm
Compression Ratio 9.5 with stock head
Displacement 1762cc
Crankshaft Main-journal diameter 48mm
Crankshaft Pin-journal diameter 48.0
2ZZ
82mm Bore X 85mm Stroke
Rods length 137.9 mm
Block height 211.75mm
Bore Wall 5.5mm
Compression Ratio 11.5 with stock head
Displacement (cc) 1795
Crankshaft Main-journal diameter 48mm
Crankshaft Pin-journal diameter 45mm
1ZZ
Rods length 146.65mm
Block height 211.7mm
78.994mm Bore X 91.440 Stroke
Bore Spacing 87.5
Bore Wall 8.5mm
Compression Ratio 10.0:1 with stock head
Displacement (cc) 1794
Crankshaft Main-journal diameter 48mm
Crankshaft Pin-journal diameter 44mm
3: Crank
The 2.0L 1980cc 9age is built by using the 1zz crankshaft. The 1zz crank has a throw of 91.5mm instead of the stock 7afe throw of 85.5mm. The increased throw adds displacement and that makes a bigger engine.
In order to use the 1zz crank you have to bore the 7afe block so that the bigger counterweights don't hit the sides and crank mounting points. This was covered in chapter 2. Also to get either crank to fit you have to have the center of the crank machined to clear the 7afe block (journal to counterweights area).
4: Connecting Rods
From what little information I could find about this engine it sounds like 2zz rods are the ones to use. 2zz rods will fit on a 1zz crank as both rods have a 51mm big end. The small ends are both 20mm as well. This might help with piston choices as now you have two options when it comes to rods. Use the 7afe rods if the rod pistons are too tall with the 2zz rods. Another option is to use the 7afe rods as they are shorter than both the 1zz/2zz rods. All three rods should fit on the 1zz crankshaft. I would use forged con-rods if you can afford them.
146.65mm = 1zz rod
137.9 mm = 2zz rod
132.5 mm = 7afe rod
5: Pistons
For the 9age to be built you have to have custom pistons made. You have to keep a piston height of 27mm-28.5 mm to keep the engine non-interference if you plan on going with 2zzge rods. If you plan on using a 20v Head you will have to have 5 valve reliefs (flycuts) on the top of the pistons. If you use the 2zz con-rods what ever piston you use has to have a bore of 83mm be no taller than 28.5mm (center of pin-top of the piston) and have a pin size of 20mm.
Also, note that you can't use the earlier bigport 4AGE pistons and wrist pin due to it using an 18mm wrist pin.
I have read that Ca18det pistons would work if shaved down 1.5mm and had new valve reliefs cut into them. Other pistons might work if they meet the requirements listed above.
