[TR] Measuring piston position

[Wayne Lee]

Jim, Did You get the Memo? It's been done without an IPod.
You'd never be able to use an audible to correlate the Piston Lift position 
to Throttle position.
by sound. The links I sent are very simple to get an idea of what's 
happening with the Piston travel.
Comparing it to Throttle position doesn't matter. You could change the 
Exhaust Note by depressing Accelerator an Inch and have the Piston
barely rise if the Rev's didn't climb much. You might be able to record a 
sweet sounding MP3 of your trip to work, but it would serve no value
to SU Carb Tuning.
With all due respect I think it's evident You're in a little over your head 
as for your method of Data Acquisition :>)
Cheers,
Wayne


--------------------------------------------------
From: <jimmuller at rcn.com>
Sent: Wednesday, December 02, 2009 4:04 PM
To: <Triumphs at autox.team.net>
Subject: [TR] Measuring piston position

> Randall wrote:
>> But, throttle position doesn't directly translate to piston position.
>
> Interesting subject, of course.  I hadn't considered whether the lift 
> button was attached to the piston or separate.  In any case, my curiosity 
> was prompted by the spring question.
>
> I would think you'd want the piston to operate through its own full range 
> through most throttle and airflow range.  If I drove a route I know and 
> recorded the audio as part of a wmv file I should be able to correlate the 
> piston movement reasonably well to the throttle position under different 
> load conditions, or at least see where on the needle it spent much of its 
> time.
>
> Whether it is running lean or rich or in debt or purple is a whole 'nother 
> question.  If I felt, for whatever reason, that it was too lean at some 
> time in that drive, I might be able to judge where on the needle it was 
> running and thus consider a needle thinner at that point.
>
> Of course, it would still be guesswork and lots of data would be just 
> plain missing.  Mostly it would be interesting to know the actual piston 
> (and needle) behavior under real conditions.
> --
> Jim Muller, too busy to do such an experiment now