CAS/CKP and tooth resolution
02-06-2018, 05:07 PM
#1
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CAS/CKP and tooth resolution
- 91 chassis
- 99 head with CAS in rear
- 97 block with 4 tooth hub
- MS3x
- Can I run the rear CAS in combination with a CKP for my toothed crank hub?
- If true, can I lead the CKP wire from the CAS to the CKP sensor? Then splice 12v and ground?
- What is the total resolution ms3x can handle? Is there a recommendation? 32?
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02-06-2018, 05:26 PM
#2
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1) No unless you have the magnetic-type CAS, in which case you can cut one of the two inner "teeth" to get sequential, and swap the front trigger for a 36-2 or other (the stock 4-tooth trigger is uneven and won't work this way).
2) Yes but you also need to use the 99+ cam sensor if you want to use the stock 4-tooth trigger wheel.
3) The MS3 can easily handle say a 60-2 crank wheel but you also need a single cam pulse from the CAS in this case - see 1).
2) Yes but you also need to use the 99+ cam sensor if you want to use the stock 4-tooth trigger wheel.
3) The MS3 can easily handle say a 60-2 crank wheel but you also need a single cam pulse from the CAS in this case - see 1).
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02-07-2018, 11:16 AM
#3
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Thanks Rev,
This is not what I was hoping to hear, but it is understandable. I do not have the option to run the 99+ cam sensor, because my valve cover will not support it (protege valve cover).
If I am understanding you correctly - If I were to get a 36-2 tooth hub wheel, and cut two ears off my Magnetic CAS. I could run a trigger wheel CKP off my existing CAS wiring ?
Does it matter which pair of ears?
This is not what I was hoping to hear, but it is understandable. I do not have the option to run the 99+ cam sensor, because my valve cover will not support it (protege valve cover).
If I am understanding you correctly - If I were to get a 36-2 tooth hub wheel, and cut two ears off my Magnetic CAS. I could run a trigger wheel CKP off my existing CAS wiring ?
Does it matter which pair of ears?
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02-08-2018, 09:55 AM
#4
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If using a 36-2 crank trigger and the NA CAS for a cam sensor, you'd need to modify the CAS so it supplies only one pulse per revolution. This could be done by cutting either the inner 2-tooth ring or the outer 4-tooth ring down to one tooth.
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02-08-2018, 04:24 PM
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I thought Cam gears needed to be magnetic as well? Is there a special cam gear type for the 99?
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02-09-2018, 09:42 AM
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yes you need the 99 cam gears, or any chinese-adjustable that are compatible with any NA/NB (except VVT).
https://www.miataturbo.net/general-m...m-gears-87595/
BTW it's not magnetic, it only has some "nubs" to stimulate the sensor. if you get chinese make sure they have the right height (distance from the sensor)
https://www.miataturbo.net/general-m...m-gears-87595/
BTW it's not magnetic, it only has some "nubs" to stimulate the sensor. if you get chinese make sure they have the right height (distance from the sensor)
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