Posted by default on September 23, 2008, 3:40 pm
My '81 CB750C has a couple where the black goo has run out. I suspect
it is causing my bike to quit in the rain.
I'd like to roll my own and looking for a schematic. From my searches
it looks as if GM used this technique in the 70's. They mounted the
module to the distributor plate so the pickup coil and advance
mechanism was inside the distributor housing. The module itself is
either a single transistor or SCR, a couple of diodes and passive
components.
Other ideas welcomed - I figure I probably have what I need to build
them from scratch, and I enjoy doing that stuff - but the basic
objective is to troubleshoot the rain problem.
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Posted by . on September 23, 2008, 4:53 pm
> I'd like to roll my own and looking for a schematic. �From my searches
> it looks as if GM used this technique in the 70's. �They mounted the
> module to the distributor plate so the pickup coil and advance
> mechanism was inside the distributor housing. �The module itself is
> either a single transistor or SCR, a couple of diodes and passive
> components.
I had two cars with the ignition module in the distributor fail
because of
cooling system problems under the hood. The ignition modules were
exposed to warm wet air and they gradually failed.
If youe Honda has a mechanical ignition advancer, that would solve
half your problems in building your own module.
Posted by default on September 23, 2008, 5:35 pm
wrote:
>> I'd like to roll my own and looking for a schematic. ?From my searches
>> it looks as if GM used this technique in the 70's. ?They mounted the
>> module to the distributor plate so the pickup coil and advance
>> mechanism was inside the distributor housing. ?The module itself is
>> either a single transistor or SCR, a couple of diodes and passive
>> components.
>I had two cars with the ignition module in the distributor fail
>because of
>cooling system problems under the hood. The ignition modules were
>exposed to warm wet air and they gradually failed.
>If youe Honda has a mechanical ignition advancer, that would solve
>half your problems in building your own module.
Given the age of the bike, technology available then, size of the
module etc., it can't be very sophisticated. Chrysler had a
mechanical vacuum retard on the pickup coil with an external switching
transistor module in the late 60's and on.
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Posted by Polarhound on September 23, 2008, 5:46 pm
default wrote:
> wrote:
>
>>
>>> I'd like to roll my own and looking for a schematic. ?From my searches
>>> it looks as if GM used this technique in the 70's. ?They mounted the
>>> module to the distributor plate so the pickup coil and advance
>>> mechanism was inside the distributor housing. ?The module itself is
>>> either a single transistor or SCR, a couple of diodes and passive
>>> components.
>> I had two cars with the ignition module in the distributor fail
>> because of
>> cooling system problems under the hood. The ignition modules were
>> exposed to warm wet air and they gradually failed.
>>
>> If youe Honda has a mechanical ignition advancer, that would solve
>> half your problems in building your own module.
>
> Given the age of the bike, technology available then, size of the
> module etc., it can't be very sophisticated. Chrysler had a
> mechanical vacuum retard on the pickup coil with an external switching
> transistor module in the late 60's and on.
Before Newtronic was bought out, all their optical ignitions were put
together by hand by a single woman.
No, I am not making this up.
Posted by The Older Gentleman on September 24, 2008, 3:21 am
> Before Newtronic was bought out, all their optical ignitions were put
> together by hand by a single woman.
>
Unmarried? I suppose work took first call.
> No, I am not making this up.
I believe you, as it happens.
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> it looks as if GM used this technique in the 70's. �They mounted the
> module to the distributor plate so the pickup coil and advance
> mechanism was inside the distributor housing. �The module itself is
> either a single transistor or SCR, a couple of diodes and passive
> components.