The diameter of the Wheel for the Pickup - MVAgusta.net
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post #1 of 15 (permalink) Old 10-16-2012, 10:05 AM Thread Starter
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The diameter of the Wheel for the Pickup

Hello,

My name is Dirk, I am from Germany and I want to implant a Weber ECU in my 43 year old Volvo. The original 1970 BOSCH fuel injection is very sensitive, and some parts are sold out.
So I decided to implant the Weber ECU.
My plan is to insert the wheel and the pickup in the original distributor housing. But running the distributor half revolutions of the crankshaft.
So I need an own wheel with twice the number of teeth and two large rooms for the timing.
My questions are: What is the diameter of the original crankshaft timing wheel
And: Can someone tell me what is the smallest possible space between the teeth, which is still recognized by the pickup?

Thanks for your help,

Dirk

PS: Please excuse my bad english

Last edited by SecondVolvoman; 10-16-2012 at 04:34 PM.
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post #2 of 15 (permalink) Old 10-16-2012, 02:55 PM
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Say what?

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post #3 of 15 (permalink) Old 10-16-2012, 03:22 PM
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He is talking about the crank sensor wheel.

This is what he is asking:

My hope is, that the MV wheel fits into the original BOSCH distributor.
But this parts runs only half rotation of the crankshaft.

My three questions are:

1: What is the diameter of the wheel and how many teeth are on it?

2: Can I build a wheel that has the double number of ( smaller) teeth with two spaces for and the sensor detects it,

3. and if it is not, can anybody change the program and reduce the number of teeth to the half. If it is so, I can build a wheel with two spaces for upper deadpoint and the teeth have the original wideness.
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post #4 of 15 (permalink) Old 10-16-2012, 04:21 PM
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I'm gonna defer to the Knurl here...or someone else much more savvy than I am....I've never really looked at a 1970 Bosch injection system.

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post #5 of 15 (permalink) Old 10-16-2012, 04:29 PM Thread Starter
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Hello,
sorry for my bad words. Some of them gave me Google.
The BOSCH Injection doesnt matter, only the Intakehousing and the Throttle will stay there.
The Distributor is an old standard piece with an inner rotorarm and a dirtibutor cap and ignition cable.
I haven't measured it yet, but i think, it nearby 70mm. I will remove the cables and the rotorarm to fit the Wheel and the Sensor.

Dirk

Last edited by SecondVolvoman; 10-16-2012 at 04:32 PM.
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post #6 of 15 (permalink) Old 10-17-2012, 08:56 AM
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Maybe CAG has a "phonic" wheel lying about he could put calipers to for you. You just need to know the OD ??

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post #7 of 15 (permalink) Old 10-17-2012, 01:14 PM Thread Starter
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Hello esq'z me,

First I need to know what is the minimum distance between the teeth, which is recognized by the pickup. And I need to know the number of teeth I need for a new Wheel.
The outer diameter is not so important. First I want to focus on the distributor.
For the distributor I have to build my own wheel.
But when I put the wheel on the crankshaft, I can use the original wheel.

This is the Volvo:






Last edited by SecondVolvoman; 10-17-2012 at 01:22 PM.
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post #8 of 15 (permalink) Old 10-17-2012, 02:01 PM
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Nice car...always liked those Volvo P1800's.

Here are some PDF files I took from the service and parts manuals showing the wheel. Maybe this will help? I'm just not prepared to pull an engine cover off at this time.
Attached Images
File Type: pdf phonic wheel.pdf (661.7 KB, 68 views)
File Type: pdf phonic wheel -2.pdf (543.1 KB, 52 views)
File Type: pdf phonic wheel -3.pdf (61.8 KB, 56 views)
File Type: pdf parts diagram.pdf (79.0 KB, 77 views)

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post #9 of 15 (permalink) Old 10-17-2012, 03:22 PM Thread Starter
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Hello esq'z me,
Thank you for the pictures.
I have a lot of time, I want to realize it till the end of next year. So I hope, the next months somebody can measure the wheel
On the photo in the pdf #1 I can see the pickup, and I think, that I can realize a wheel with smaller teeth, because the distributor runs half rotation and the center of the pickup is very small.
I think the only way to find out is to try it.
Now, it's interesting what is the wheel diameter
Then I can draw a wheel and compare the spaces and the width of the teeth.
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post #10 of 15 (permalink) Old 11-04-2012, 09:37 PM
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Thumbs down WeberMarelli ecu?

SecondVolvoman;
the WeberMarelli ECU is old and VERY primitive even by motorcycle standards
it doesn't;
reference MAP
have an 02 sensor
an IAC stepper motor for idle speed

look into the MegaSquirt/MicroSquirt ECUs they are open source stuff

the old Bosch on the P-1800 is far more advanced than the WeberMarelli on the MVs

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