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Registered:
November 2002
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How does a 4AG dizzy pick up crank angle?
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Mon, 08 March 2004 14:06
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Hi,
Can someone explain how a 4AG internal CAS works? How does in know when #1 is @ TDC?
I think its a 24 tooth pick up gear?
A pic of it would be good too?
I've seen 2 type of dizzy on the 4AG, one that doesn't have leads and seems to be just a CAS and the other with leads. Does the one with leads also have the same CAS setup inside?
Thanks,
Simon
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Toymods Board Member
I supported Toymods
Location:
Turramurra, Sydney.
Registered:
May 2002
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Re: How does a 4AG dizzy pick up crank angle?
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Mon, 08 March 2004 16:00
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The distributor has 2 teethed wheels, one 4 tooth & the other with quite a few teeth (I thought it was 36, but maybe it's 24, unfortunately I don't have one sitting next to me atm, it's all the way downstairs), and a sensor for each wheel.
The cam angle sensor that comes on the GZEs with twin coils has 2 wheels, the lower one with multi teeth & one sensor, same as the dizzy, but the 2nd wheel has one tooth & 2 sensors mounted opposite each other.
I'm not in the best frame of mind to be working out how they pick no.1 TDC, maybe in the morning. 
I wonder how many times bigger the drive cog on the exhaust cam is than the driven dizzy/CAS cog..... it's at least twice the size.
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Registered:
November 2002
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Re: How does a 4AG dizzy pick up crank angle?
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Wed, 10 March 2004 13:11
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The reason I ask is thayt I have a Microtech runnign my engine and want to know if just the multi toothed gear is all I need to get rid of the dizzy or do I need the other pick up wheel as well?
Simon
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Location:
Montrose, VIC
Registered:
May 2002
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Re: How does a 4AG dizzy pick up crank angle?
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Wed, 10 March 2004 13:57
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Well, in order to get rid of the dizzy and use coils, you'll need to have a 'home' signal so that the ECU can tell whereabouts the engine actually is. For this, you can likely either use the original home (1 tooth) magnetic pickup (preferable!) or possibly create one by filing one of the 24 teeth off. Read the microtech manual and see! (I'm not overly familiar with the specific setup of mictotech, I've only ever played with other brands)
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Registered:
November 2002
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Re: How does a 4AG dizzy pick up crank angle?
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Wed, 10 March 2004 14:04
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I did call Microtech and they said I need to use a 24 tooth wheel. What I'm not sure about is if the Toyota 24 tooth gears have a home position standard or if this is done with a separate sensor on the standard Toyota setup.
Simon
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Toymods Board Member
I supported Toymods
Location:
Turramurra, Sydney.
Registered:
May 2002
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Re: How does a 4AG dizzy pick up crank angle?
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Wed, 10 March 2004 14:59
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The standard dizzy has 2 wheels & sensors, and the microtech uses 2, so you need to hook both up & chop 3 of the teeth off the 4 tooth wheel.
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