Re: [alfa] Starter drive gear measurement

[hagen_jason@xxxxxxxxxxx]

Do NOT put the starter for a 130 tooth flywheel on the 131 tooth car.  It does not work properly.  You can buy a rebuilt from starterexpress.com for the 131 tooth flywheel for cheap.

I have a 130 tooth flywheel on my '73 and ended up buying the starter for a Series 4 Alfa to fit.  Way expensive, but much better than the old ones.

Alfa apparently went back to the 130 tooth design in 1991...

Sorry I can't supply the measurement for you...

--
- Jason Hagen
Chicago, IL
'73 Spider
'95 164Q
> OK,  I have a unususal request.
> 
> I'm looking for somebody(s) who has a known 72-74 era starter (the one 
> meant for the 130 tooth ring gear) who could measure the drive gear with 
> a caliper for me.
> 
> I have a 130 tooth ring gear (due to my rebuilding an early motor) and a 
> 131 tooth starter.  I also have a couple of starter drives I got at a 
> swap that seem slightly larger than my 77 starter's drive.
> 
> Since we're talking a difference of .987" to .997",  I'm wondering if 
> all I'm seeing is wear.
> 
> So, if anyone has a known 130 tooth starter handy and a pair of 
> calipers,  it would be great if you could measure across the two widest 
> teeth and let me know what you found.  Since the 9 tooth "star" ends up 
> without two teeth exactly across from each other, you can't measure true 
> diameter.
> Measuring across the widest two is the reference I've been using.
> 
> This will be nice if we can nail this down,  then it will be possible to 

> pick up an unknown starter and determine what ring gear it will be happy 
> with.  From what I've found, you can't do this just by reading part 
> numbers,  even Bosch dosen't seem to know what the old numbers mean 
> nowadays.
> 
> I'm kicking myself for not measuring diameters and tooth dimensions on 
> the early gear (have the transmission back on the engine now) but can on 
> the 131 flywheel.  I'll try to guestimate the size difference of that 
> one tooth, and what it will do to the diameter and therby radius of the 
> drive gear, as a cross check.
> 
> Jon
> 77 Spider
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