4age
Capacity: 1600cc(it's rounded up!! i dunno the exact number u freak!)
HP: large port:112hp@6600RPM small port:130hp@6600RPM
Torque: large port:97lb/ft@4800RPM small port:105@6000RPM
Compression: large port:9.4:1 small port:10.3:1
Head: DOHC 16V aluminum head
Block: Iron block...heavy but strong =)
Misc. Info
The fuel cut of this engine is 8000rpm and it will happily sing it's song up to that RPM range for you. It likes to rev, and at high rpm's is where it's most happy!
There are two 16 valve versions as I have noted above...the small port and the large port engine....the differences between the two are as follows:
Large port- This motor was the first generation 4age which obviously had large intake ports on the head! It utilized what was dubbed as TVIS(Toyota Variable Induction/Intake System). How that works is that on the intake manifold, there are 2 intake runners for each cylinder. for low RPM operation, only 1 out of the 2 runners will be utilized per cylinder to give the car better torque characteristics. Then once at high rpm, both runners are used per cylinder to give it as much air as it desires. The operation of the intake runners is actually VERY simple: The runners only used for high rpm operation are closed with butterfly flaps that are operated by a spring. at high rpm, the engine will obviously suck more air and will open the flaps(due to the vaccuum effect). simple eh? yup.
The engine itself is lower HP than the small port because it is lower compression; it is able to use 87 octane gas
boy am i jealous of those big port owners.
Small port - It is the last generation 16 valve 4age engine. It did away with this tvis and utilized smaller intake ports on the head. This gave the intake charge more velocity as the speed wasnt lost through a HUGE ass opening. This in turn gave the car a higher torque figuer(mind you, it comes in at a much HIGHER RPM).
The compression was also upped and the engine ran larger injectors to fuel it's higher compression needs.
Both engines have a nice and strong iron block and internals. Why is this good? Well, it's DURABLE! sure, the extra weight caused by the iron parts make this a slower reving engine when compared to a honda motor...but please, have u seen the alumunim honda rods? If you sat on it, u'd bend it. The rod's are as thick as pencils. PLEEEASE. would u want to use that type of thing for HIGH RPM OPERATION?! keep in mind that the higher the rpm the more heat and stress the engine has to undergo! So sure, a Honda is a better revving engine...some might even say better performing...but for realiability issues, i'd stay away from that as I blew my honda engine long ago at the track.
Why is the 4age so popular?
It's simple...The 4age is one of the first high performing 16v 4 cylinder twin cam engines. and not only that, but this is 1984 technology and it can rev to 8000rpm!!!!! this is 19 years ago!! It is also very easily attainable and can be had for cheap. So anyone could pick one of these up and turn it into a real race engine and not worry about paying an arm and a leg for another spare engine!
Other 4ag motors
There are 2 other massly produced 4ag motors:
4agze and the 20v 4age(Just dubbed as the 4age).
The 4agze is a supercharged engine that was first available on the aw11 MR2. Coupled with an AFM sensor and lower compression, the 1st gen 4agze put out 145hp but with very impressive torque. Later on, in the AE92 models(Levin/Trueno GTZ in Japan) utilized the newest 4agze engine. Toyota did away with the AFM and put in a MAP sensor and added higher compression. The end result was 170ps and even more torque!
The 4age 20v came in 2 versions as well: The silver top and the Black top. The differences being that the silver top used the AFM and was available on the ae101 model. It put out a factory stated 165ps and has FOUR throttle bodies and 5 valves per cylinder. This motor is high compression and used VVT(variable valve timing) on the intake cam. The black top used a map sensor and even higher compression and VVTi. This engine put out 170ps and was available on the ae111 model. The reason why they are called black/silver top is due to the color of their valve colors(duh). But mind you, this is a very inaccurate way of detecting which motor is which because the valve covers could have been switched. just look for the afm...if u cant see it then it's a map.
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