4a-ge on AL21

[peter_tuning]

I"m Peter from Ukraine (Kiev). I"m not good speak english.
i have japanese corsa AL21 engine 3A-U.
engine swap
4a-ge + horizontal carburator Solex ADDHE 40
here are the questions
1- is the flywheel"s diameter of 4a-ge and 3a-U are equal?
2 - oilpane 4a-ge and 3a-U are equal?

[Petros]

Welcome Peter! Your English is just fine.

You will need to swap flywheels, the 3a is smaller diameter and the starter will not work with the 4a flywheel.

With some of the 4a engines have a six bolt flywheel and it is just a bolt-on issue (make sure you get the torque correct). Some of the higher powered 4a engines have an 8 bolt flywheel and will not switch without welding in the holes and re-drilling 8 holes on the 3a flywheel. If you have access to a good machine shop this is not a big issue, you should also take some wieght off that flywheel while you are at it, and have it rebalanced. You can either find the 4a engine with the 6 bolt flywheel, or swap out the crankshaft (I think the crank will intechange, but that is a major job).

The oil pan will likely have to be changed because of the clearance. It should switch over without issue, if you do it carefully you might even be able to save the pan gasket by using fresh sealer on it.

Good luck and let us know how it goes. I would love to see pictures of that duel side draft carb set-up. I wonder how much it would cost to get that set here in the states.

[peter_tuning]

flywheels diametr 3A engine 250 mm

[peter_tuning]

I disasembly my engine 4a-ge. (AE 86)
crankshaft 4a-ge have 8 bolt flywheel
I have too second engine 4a-fe (Carina E)
crankshaft 4a-fe have 6 bolt flywheel

flywheel 4a-ge diametr 270 mm.
I found flywheel 2A-U (tercel engene) diametr 250 mm

cylinderblok with piston 4a-ge + crankshaft 4a-fe + flywheel 2A-U

I need balance crankshaft 4a-fe with flywheel 2A-U

[shogun]

i would keep the 4ag cranck because its the best from the engines you mentiones and it would be better that you redril the flywheel

[Typrus]

A good machinist and tooling shop should be able to weld in those holes, balance it out, then redrill for 8 bolts. And balance. That'd probably be best. Or you know you might be able to press the starter ring off the 4AGE flywheel and have it machined down till you can press on the starter ring off of the 2A-U. I'm not sure if thats possible on that flywheel. Someone else around here will know. If that is possible, you could have them strategically lighten it as well.

COMMON MISCONCEPTION! A lighter flywheel will never give you more horsepower. What a lighter flywheel will do is allow your engine to accelerate and decelerate faster. You will grab revs faster basically. And lose them faster. One of the disadvantages is that you will feel more of the power pulse. Part of why a flywheel is there is to smooth out what is called the power pulse. With a 4 cylinder, because the engine makes 2 rotations in a cycle, you get a cylinder firing every 180 degrees of crankshaft rotation. In between each one of those firing events, the assembly slows down by a certain amount. The flywheel acts to keep the assembly moving, by momentum of the heavy steel. This smooths out the pulse. This really is most noticable at idle and low revs. Beyond a certain point, the engine is spinning fast enough that the power events are so close that the pulse is imperceptable.


Combine a light fly, BIG lumpy cam, Weber 32/36 or 38/38 ( if you can get the adapter plate to work, or find one which they do make by the way) and a nicely executed exhaust... You'll have one mean-sounding setup.

[peter_tuning]

I have agane problem- water pump. on tercel short pump AE 86 have long pump.
pulley (water pump) need new

[Petros]

do not the water pumps just swap out? They look like the same bolt pattern. At worst you could press out the longer shaft out of the housing, and press it in the shaft you need (put in a new seal while you are at it).