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Old 09-29-2020, 07:32 PM   #1
Shinchan
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Default Looking for ideas: B20 crank sensor mounting

Trying to wrap up a microsquirt/b20 project. I'm using a missing-tooth wheel bolted to the crank pulley. I originally had my crank sensor mounted 240 degrees from TDC, turns out that that's not a good spot/too far off of TDC.

Looking for ideas on mounts and mount points to get the sensor mounted in the correct range. Unfortunately the ideal spot is right in the center of the fan belt and there just don't seem to be any decent spots that I see to mount a bracket that won't get in the way of the belt or be too close to the pulleys or put the sensor too close to the alternator.

Would love to see how folks have their sensors mounted and if you used a vendor-supplied mount, where did you get it? My fabbing skills are not the best.
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Old 09-29-2020, 09:06 PM   #2
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What's wrong with 240deg? Is the timing not stable during cranking? I'm not sure if it will help, but is 1st Deriv Prediction turned on?

Can you rotate/flip the toothed wheel? How many teeth?

And how about a Tooth Logger log if you're having cranking issues?
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Old 09-29-2020, 09:08 PM   #3
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I went with a CAS adapter from Yoshifab on mine. Drop-in solution for a cam/crank, or you can get his hi res wheel if you want as well.
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Old 09-29-2020, 09:10 PM   #4
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Still no build thread?

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Old 09-29-2020, 11:16 PM   #5
Shinchan
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On consulting with another B20 megasquirt builder, it's probably not the angle, it's either that the sensor is slightly off-center on the wheel or a wiring issue. Back to ye olde drawing board.
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Old 09-29-2020, 11:44 PM   #6
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You can order one from Clewett Engineering and not have to reinvent the wheel.Literally.
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Old 09-30-2020, 09:06 AM   #7
Shinchan
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Yeah, I contacted them with some questions and never received a response.

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You can order one from Clewett Engineering and not have to reinvent the wheel.Literally.
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Old 09-30-2020, 10:07 AM   #8
mitch1971
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I made a bracket that bolts to the side of the block just in front of the engine mounts and then to the front of the block under the coolant tube. The bracket fits over the top of the coolant tube and to the front of it where the sensor mounts to it. A pic would be a lot easier so PM me a email if interested in a couple of pics, I have some from when I mocked it up years ago.
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Old 09-30-2020, 02:39 PM   #9
Shinchan
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Yeah, but $$$$$$$$

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I went with a CAS adapter from Yoshifab on mine. Drop-in solution for a cam/crank, or you can get his hi res wheel if you want as well.
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Old 09-30-2020, 03:03 PM   #10
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Will this work?

http://www.retroturbo.com/?product=b...sensor-bracket
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Old 09-30-2020, 03:04 PM   #11
OttoB
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I made front trigger for my B30 ecu project, even got 12-1 wheel cut and hall-sensor.
Then I saw the light. Now I got 60-2 on flywheel and vr-sensor.
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Old 09-30-2020, 04:28 PM   #12
Shinchan
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possibly...

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Old 09-30-2020, 05:53 PM   #13
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possibly...
It wont as bolt on solution without modification. There isnt any holes over there.

2 ideas I had before going to the Yoshifab DSM CAS Adapter (for vintage models).

1) take bolt spacing of driver side timing cover bolts and weld up steel adapter plate using 3 of the lowest bolts.

2) use oil pan bolt spacing for the frontmost 4 bolts and make an adapter bracket there.

Where I ended up, spend ~400$ and buy a Yoshi adapter, hi res disc, DSM cas, and mod my board for cam and crank.
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Old 10-05-2020, 12:22 AM   #14
TR Conn
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A simple bracket with the trigger wheel available from DIY.
The trigger wheel was spot welded to the pulley after confirming it was positioned correctly.
About $30



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