Siduna
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| posted on 29/4/12 at 07:00 PM |
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Question on electric starter for reverse
Hi all!
I'm working on using a starter motor from a car for reverse gear. The starter is a Bosch and comes from an Opel Omega 1996. The sprocket wheel
has 9 teeth but I'm uncertain of the module. I've been measuring and calculating and comes up between 2 and 2,5. The teeth does not have
"standard" profiles, and I gues no starter gears have ("thinner" for easier engagement).
Can anyone of you guys bring som light on what module the sprocker gear has? I'd like to be pretty accurate since I intend to machine a gear
that fits to the starter engine. On the same shaft I'll place an idle gear for chain tensioning ... pretty clever!? 
Writing with a broken pencil is pointless
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40inches
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| posted on 29/4/12 at 08:09 PM |
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You may find that the Vauxhall starter turns the wrong way.
Rigging an electric reverse has been done, many times, check my archive for all the info you should need, and the only starter motor you can get at a
reasonable price that turns the correct way, as far as I could find, are the VAG ones.
http://www.locostbuilders.co.uk/photos.php?action=gal&user=40inches&folder=Electric%20reverse
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phoenix70
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| posted on 29/4/12 at 08:59 PM |
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40 inches, you wouldn't have the original CAD drawing for your bracketry would you? thinking of getting andyw7de to cut some for me and it
would save me having to re-draw them
Cheers
Scott
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40inches
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| posted on 30/4/12 at 07:02 AM |
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No problem, U2U your email address and I will send them
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Siduna
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| posted on 30/4/12 at 08:21 AM |
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40 inches, strange as it may seem my design is not "sensible" to the rotation direction of the started engine. I'll use it to turn
the idle gear for the chain tensioner thus applying the reverse direction of the chain (no prop drive in my case). Hence I can turn the engine so that
the sprocket gears turn the right way for making the car going backwards.
Therefore I'm still in need of knowing the gear module on the sprocket wheel on the starter engine. My guess (!) is that for most European cars
the moduel is the same?
Writing with a broken pencil is pointless
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40inches
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| posted on 30/4/12 at 11:52 AM |
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Siduna, the gear isn't a MOD pitch, it's a DP pitch, 12DP to be exact. I was expecting a MOD.
I took a Ford, Vauxhall(Opel) and a VAG starter motor to HPC, along with a ring gear from an Audi, they confirmed that they are all
12DP. If you look in my archive at the photo of the Audi ring gear, you will see that the gear teeth profile is in a very simple form,but
it obviously works well for the time it is actually in use.
[Edited on 30-4-12 by 40inches]
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Siduna
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| posted on 30/4/12 at 01:44 PM |
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Thanks for the information! Highly appreciated.
Would have been happier learning that it was a MOD pitch though ... imperial standard isn't really the thing where I live ... just have to start
up the brain cells and the machinery to make a gear wheel then ... 12DP is the equivalent of 25,4/12=2,117 MOD ... a lot of "obstacles"
coming my way ...
Are there any suppliers in the UK for DP pitch wheels I could by and do the final machining myself?
Writing with a broken pencil is pointless
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40inches
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| posted on 30/4/12 at 02:30 PM |
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Sorry! that should have been HPC Gears not CPC.
Catalogue
I couldn't find anywhere in the UK that was any cheaper
Where in the world are you by the way?
[Edited on 30-4-12 by 40inches]
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Siduna
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| posted on 30/4/12 at 04:34 PM |
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Thanks for the tip 40inches!
Where in the world I live? Sometimes I wonder if it's a country or a joke, but it's called Sweden.
Writing with a broken pencil is pointless
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