[Diy_efi] fast-ish 6 channel data logger

[Gianmarco Rizzo BE/EAS]

digital storage oscilloscope is a good idea, but rather expensive... considering this is a hobby

just to be more precise, there seem to be issues with spark synchronization when cranking due to the engine slowing down during compression stroke and accelerating after TDC. the engine is a duke, with a rather poor starter motor. there are 2 phase sensors, one on camshaft for phase and one on crank for synch, but with only 4 teeth in the wheel.

i have an analog CRO but its hard to see anything interesting. so i thought a data logger might be the answer to see what happens during several compression strokes and how spark and fueling behave and when occur compared with crank signals

i have found a cheap data logger but it is limited to 240 samples/second in the cheap form

i guess at least 1000 samples/seconds will be necessary to see the injection/spark events


regards

gm

> -----Original Message-----
> From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]
> Sent: Dienstag, 19. April 2005 19:46
> To: diy_efi at diy-efi.org
> Subject: Re: [Diy_efi] fast-ish 6 channel data logger
> 
> 
> Bellisimo,
> 
> u can get a digital storage oscilloscope to get u most
> of the way there, as long as you only want to know a few
> samples and dont need to keep recording under different
> conditions...
> 
> Many DSO's on market, might need to make up a
> basic interface so u dont blow the DSO front end, 
> but can usually save output to file for print etc...
> 
> Regards from
> 
> 
> Mike Massen
> Perth, Western Australia
> VL Commodore Fuse Rail that wont warp or melt !
> http://niche.iinet.net.au
> 
> At 01:32 AM 20/04/05, you wrote:
> 
> >Hi all
> >
> >i am looking into a solution for a problem.
> >
> >i have a aftermarket EFI, and i would like to monitor 
> exactly what happens while cranking the engine, so as to see 
> exactly when spark and fueling occur in comparison with phase 
> sensor pulses
> >
> >i have thought that perhaps a fast 6 channel data logger can 
> help me there, taking 2 injectors, 2 coils and 2 phase 
> sensors data fast enough to reconstruct the few seconds 
> during cranking and see when different events occur.
> >
> >so i wondered if anyone has info on how to build this or 
> something available on the market that wont cost more than 
> the motorbike i am running the injection on :-)
> >
> >saluti
> >
> >gianamrco 
> 
> 
> 
> _______________________________________________
> Diy_efi mailing list
> Diy_efi at diy-efi.org
> http://lists.diy-efi.org/mailman/listinfo/diy_efi
>