Hi , i'm planning on running a 4AGE motor in my GX. Seen a couple of people talking about wasted spark. What is wasted spark and how does it work ???

Hope that someone can help me out with some information here.....

in a 4 stroke engine, the piston goes up twice. one time to compress the fuel and spark, the other time to push burnt gas out the exhaust port. typically you only spark on the compression stroke. with wasted spark you also spark on exhaust stroke. this has the benefit of doing a final burn out the exhaust which can reduce emmisions. also for electronic ignitions, it reduces the number of coils and expensive switching transistors needed.

there might be a better description online, but thats my understanding.

Yes, that sounds correct. Wasted spark just means two plugs fire at the same time.

It can use a distributor or not.

It is almost always done to simplify design, and certainly gain no extra power. But it does not hurt power. There is nothing to be gained by going to non-wasted spark.

It's a bit more technical than just two plugs fire at the same time. The two paired cylinders' plugs will fire at the same time, thus the one that is on compression, and the one that is on exhaust stroke at that time. Generally 1+3 and 2+4 is paired up. Otherwise you might get a spark on an intake stroke which wouldn't be good.

Because you run wasted spark it would imply that you'll also have a minimum of two coils. Which means that the coil has to work only half the time, which in turn means it has double the time to charge if you so like. This will ensure a very good spark on most applications, so you'll have more complete combustion.

Rightly so you probably won't make any extra power by going wasted spark, but your car will definitely run smoother. There was a notable difference when I changed my system, both on throttle response and on starting.

There is a noticeable difference because of using better ignition system. The wasted part doesn't matter. It's called wasted because some of the sparks are not used/useful.

Some guys have spent lots of money upgrading from "wasted spark" systems to non-wasted. But there's no practical difference except for the theoretical ideas. Their idea is that the four coils only fire half as often as two wasted spark-coils, so therefore it "rests" in between.

My 1200 is running wasted spark, but the main difference is the extra high-voltage spark, much higher than 1980s electronic igntion. It can use a 0.054" (1.3mm) spark plug gap instead of the standard 0.030, or even the Datsun electronic ignition 0.042 gap.

The wasted spark ignites part of the exhaust stroke without oxygen?
thats new to me and if so then exhaust emissions would be improved
and so would exhaust thermal expansion therefore improving power.

Presumably wasted spark also burn out the spark plugs twice as fast?

and the "Wasted" one is current flow in the opposite direction, ie the earth side of the system..

Well thats a lot of different opinions.......

The reason for me asking is to get rid of the dizzy that is mounted on the back side ( Gearbox side) of the motor. then i do not need to cut and modify on the firewall. If it performs better or not is not really a problem unless if it performs worse than the dizzy.

So do i get a different motor where the dizzy sits on the front of the motor or do I go wasted spark ?"???

can you get the same motor with dizzie at front or will you be forced with diff motor?
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