4AGE four plugs firing at once
4AGE four plugs firing at once
(OP)
Any thoughts about a Toyota 4AGE 20 valve engine, that fires a coil-on-plug ignition system, ALL AT THE SAME TIME? I'm not referring to an alternating "wasted spark" system, that fires two-and-two, but one that all four at the same timing point. The coil/plugs are in parallel with the igniter. A pair will always be firing at the start of the intake stroke. These guys swear its an operating concept, no loss of power, normal throttle response, ect.
http:/ /forums.cl ub4ag.com/ zerothread ?id=18900& amp;page=6
about 1/4 way down the page, there is a schematic.
please don't shoot the messenger, I am seeking understanding.
http:/
about 1/4 way down the page, there is a schematic.
please don't shoot the messenger, I am seeking understanding.





RE: 4AGE four plugs firing at once
RE: 4AGE four plugs firing at once
I can hop on one leg and simultaneously sing the British national anthem. I always choose not to.
Regards
Pat
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RE: 4AGE four plugs firing at once
www.tynevalleyplastics.co.uk
RE: 4AGE four plugs firing at once
Not likely unless someone slips me some powerful mind altering drugs
Regards
Pat
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RE: 4AGE four plugs firing at once
Bill
RE: 4AGE four plugs firing at once
h
and
JMW
www.ViscoAnalyser.com
RE: 4AGE four plugs firing at once
With a 4-banger 4-stroke engine, if you fire ALL the plugs at the same time, you will have to do the above, but also fire the plugs approaching *bottom* dead centre, since that occurs simultaneously with the other cylinders approaching top dead centre. Firing the spark plug nearing the end of the power stroke won't do anything bad, but firing it near the end of the intake stroke, when the cylinder is full of fresh air/fuel mixture and the intake valve is still open, has a rather high risk of igniting the whole thing and backfiring out the intake system.
RE: 4AGE four plugs firing at once
RE: 4AGE four plugs firing at once
Regards
Pat
See FAQ731-376: Eng-Tips.com Forum Policies for tips on use of eng-tips by professional engineers &
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for site rules
RE: 4AGE four plugs firing at once
an ingition amplifier desgined to run 1 coil could not run four for very long.
RE: 4AGE four plugs firing at once
Why doesn't the wrongly timed spark ignite the mixture?
Maybe the petrol/air mixture at normal pressure and temperature cannot be ignited by a spark. Several years ago I attempted to make a heating torch by attaching a carby to the intake side of an old compressor and ran a hose from the outlet - there was no way in the world the mixture coming out would ignite. The mixture appeared to be far too lean to burn - it didn't even smell "petrolly". Quite possibly the mixture needs to be made much denser and heated to 100/150 degrees C (as it is at the end of the compression stroke) before a spark will ignite it.
Also, with a conventional crank-fired "wasted spark" system the spark that occurs towards the end of the exhaust stroke also occurs when air/fuel mixture is flowing into the cylinder and is exposed to the spark - but it does not ignite. This is a very interesting question that shouldn't have mostly been dismissed as "It doesn't work".
RE: 4AGE four plugs firing at once
Regards
Pat
See FAQ731-376: Eng-Tips.com Forum Policies for tips on use of eng-tips by professional engineers &
http://eng-tips.com/market.cfm
for site rules
RE: 4AGE four plugs firing at once
And apparently the "why would anyone do this" is answered by the desire of some folks to install this engine into older RWD Toyota Corollas- there are problems with the cam driven distributor, you have to ding the firewall for clearance.
RE: 4AGE four plugs firing at once
.. but there was a trick; a Kaehni ignition. I.e., the coil was run by a vibrator and fired continuously.
That's not the trick. The trick is that the heads had been equipped with precombustion chambers in which the plugs fired, and the precombustion chambers communicated with the combustion chambers only by short capillary passages.
The mixture in the p/c chambers changed with the gas dynamics in the combustion chambers, but the combustion chambers only 'fired' when there was a combustible mixture in the capillaries, which allegedly occurred naturally at exactly the right time to light the combustion chamber's mixture.
So, the timing was generated by the gas dynamics, and hence, always optimal. .. allegedly.
Given timed fuel injection, continuous firing plugs might work in a modern engine, at least well enough to say 'it works', though probably not well enough to satisfy the smog police.
Mike Halloran
Pembroke Pines, FL, USA
RE: 4AGE four plugs firing at once
Assuming the system works on a 4-cylinder engine - it should also work on a "flat" crank V-8.
RE: 4AGE four plugs firing at once