How about a thermocouple array on the exhaust system.  There's 1700
degrees there that should generate quit a bit of power. If you can get
100 mW from each one you would need 4200 TC's to get 12 V at 35 A.

Bob White

On Sat, 06 Nov 2004 14:33:06 -0500
Ernest Christley <echristley@nc.rr.com> wrote:

> Per the discussion of breaking belts...
>
> Belts are needed for two things, the alternator and the water pump.
> But if we replace the water pump can we get rid of the belt?
>
> Has anyone considered replacing the crank angle sensor with a PM
> alternator/generator?
>
> The things are relative simple (a can of coiled wire with some magnets
> on a spinning shaft in the middle), but what effect would a spinning
> magnet have on the hall effect sensor that drives the ignition system?
>
> I've been looking at this a while.  It looks like a hole could be
> tapped and threaded into the top of the crank angle sensor shaft.  A
> generator with a threaded shaft would be screwed into that, properly
> oriented threads insuring that the generator shaft will never come
> unscrewed, and some straps on the housing to keep it from spinning.
>
> A 35A generator, is < 500W would only need a few ft.oz. of retaining
> force at 6000RPM.
>
> The front pulley could be replaced with the same sort of installation.
>
> Another consideraton.  Alternators have a heavy shell, bearings and
> mounting because there is a substantial side loads and vibrations
> derived from the belt.  A gear driven generator can be much lighter,
> with just a sheet metal can for a housing.
>
> I've got a number for an electrical engineer who is going to help me
> work out the feasability and sizing for this application, but I'd like
> the thoughts of anyone on the list.
>
>
> --
> http://www.ernest.isa-geek.org/
> "This is by far the hardest lesson about freedom. It goes against
> instinct, and morality, to just sit back and watch people make
> mistakes. We want to help them, which means control them and their
> decisions, but in doing so we actually hurt them (and ourselves)."
>
>
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>
>


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