Fully Sequential Spark and Fuel - Cam & Crank Signal - Page 2 - Alfa Romeo Bulletin Board & Forums
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post #16 of 20 (permalink) Old 03-23-2017, 02:36 AM
Duk
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To add a little to IanB's comments, the camshaft speed/half engine speed sensor simply provides a reset to the ECU so it knows what half of the 720* cycle the engine is in.
Some cam speed sensors have 180* of trigger edge so that the ECU can figure out as early as possible during cranking where the engine is. After all, the ECU won't know where the engine stopped when the ignition is switched off and it has to figure that out by having the appropriate reset edge go pass the sensor.

A classic example would be for the Bosch 60-2 CAS with no cam speed reset, where the engine has stopped just after the minus 2 reset point. The engine must be cranked a full turn before the ECU can fire injectors or ignition, because it just has no idea where the engine is in its rotational position. But in the mean time, on a 6 cylinder engine, 3 induction strokes, 3 compression stokes and 3 exhaust stokes will take place. And that causes strain on the starter motor and drain on the battery.

Slowly Progressing Vortech Supercharged 1990 Alfa Romeo 75 Potenziata. Out of Action Twin-Charged 1988 AW11 MR2. Current Daily Driver, The Glorified Taxi 2006 BF FPV F6 Typhoon.
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post #17 of 20 (permalink) Old 04-14-2017, 08:07 AM Thread Starter
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Ok, fitment continues!
With my back-woods, garage monkey approach, you'll see the brilliance I am trying to create with these photo's.

For anyone else attempting to do this.
Next time, just buy the **** black plastic adapter (linked on page 1) and adapt that to your distributor.

Now, onto the craziness I chose to take on.
Bought a 4x4x1 aluminum block off ebay for 12$ shipped (in hindsight a 1/2" thick one is all I needed).
Mill it with your router, drill holes with your drill press, make it perfectly centered on everything.
Fit it together, and you find the rubber tab slot for your distributor needs to be .22"...the Alfa is like .18" (to narrow).
Break out the angle grinder and the dremel, slowly....slowly grind away till you think it fits.
Spend about 2 hrs, still doesn't fit....take a break and come back at it tomorrow.

Any idea's on making my own 'custom' rubber piece for this fitment?
So far it's a 7-10 on the fabrication scale, 10=e-type jag rolled fender, 1=self drilling screw through metal fastener install.

drilling
AEM EPM - Install and adapter and fitting by Ian Bennett, on Flickr

milling to thickness
AEM EPM - Install and adapter and fitting by Ian Bennett, on Flickr

'finished' adapter plate (still not sure if it's finished, but it does fit.
AEM EPM - Install and adapter and fitting by Ian Bennett, on Flickr

No Mas
AEM EPM - Install and adapter and fitting by Ian Bennett, on Flickr

How thick the gap in the distrutor 'slot' should be in MM.
AEM EPM - Install and adapter and fitting by Ian Bennett, on Flickr

Work continues and so will the photo's till this thing is 'done'.
Still might spend the 45$ for the printer one, but probably to deep into this BS aluminum already, and it's not what's holding me back.
It's the slot int he distributor that's holding me back right now.

Ian
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post #18 of 20 (permalink) Old 08-29-2018, 07:28 AM
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@IanB

Did you ever get this to run?

Thanks
Alessandro

Learning, learning..
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post #19 of 20 (permalink) Old 08-29-2018, 08:19 AM Thread Starter
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Quote:
Originally Posted by AlessandroM View Post
@IanB

Did you ever get this to run?

Thanks
Alessandro


The plan is to still use this setup. Head has been at the machine shop for 5 months, but I think will be ready soon. ECU won’t be purchased till next spring and then we’ll crank for the first time and try to get some signal off this contraption.

However, a friend on Instagram tried this very setup with a fully machined adapter and for whatever reason wasn’t able to get a signal. So, with that experience I am worried this may not work. My friends fall-back was the normal crank sensor and going to batch fueling not sequential. We’ll see what my fate is next year.

Ian


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post #20 of 20 (permalink) Old 08-29-2018, 09:23 AM
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Maybe not as clean installed, but for sure lighter
The cam sensor i mean...
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cam signal, crank signal, sequential fuel, sequential spark

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