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M1BYT > TECHNI 07.08.03 00:21l 48 Lines 2341 Bytes #999 (0) @ WW
BID : 1B1605M1BYT
Read: GUEST DB0FHN OE7FMI
Subj: Re: Motorcycle electronic ignition.
Path: DB0FHN<DB0RGB<OK0PPL<OK0NAG<9A0BBS<ZZ2LEW<PU3ACY<EB4BCS<ED1ZAC<GB7YKS<
GB7FCR
Sent: 030806/2210Z @:GB7FCR.#16.GBR.EU #:8445 [Blackpool] FBB-7.03a $:1B1605M1B
From: M1BYT@GB7FCR.#16.GBR.EU
To : TECHNI@WW
VK3ABK Opined with considerable skill:-
> I have been looking at copies of 'Silicon Chip' (do you see this in Europe)
> as I had an idea an ignition system for motorcycles had been printed.
> So far, no luck as some of my magazines have been misplaced. I'm still
> looking! I have found articles involving reluctor and photoelectric timing
> systems for motor cars, using a distributor, and electronic switching of
> a standard ignition coil. These do not include automatic advance, which is
> usually achieved by a vacuum supplied from the carburetter manifold.
>
> But I suspect that Wim wants electronic ignition with only the timing taken
> from the engine crankshaft. This is the modern way, and most, if not all,
> cars and 'bikes' would use this. But then, it would be a sealed, and very
> expensive unit made by or for each car or bike company. Not easily examined,
> nor would it be easily made by an amateur. The electronics would be the
> patented property of the manufacturer.
A simple electronic ignition system using the existing coil and
mechanical advance system is fairly trivial project and could be bought
cheaply, however.....
A full blown completely electronic ignition system is not. It requires a
crank shaft trigger and at the very least a vacuum input transducer. You
then need a microprocessor able to look up in an EPROM the correct
instant to fire the mixture based upon engine speed, vacuum level and
anticipted rotational position of the crank. The data for the look-up
table EPROM is the really tricky part.
ÉÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ»
º 73 from Harry, M1BYT @ GB7FCR.#16.GBR.EU º
ÌÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ͹
º International Museums Weekend 19th+20th June 2004 º
º www.ukradioamateur.org/imw/index.html º
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º The ARC's FL/RAE courses + Newcomers Intro to º
º to amateur radio:- http://www.ukradioamateur.org/ º
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º QTH: Garforth, W. Yorks.. º Timed 22:10 º
º harry.m1byt@tiscali.co.uk º 06 Aug 2003 º
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