Larry,
OK, call me silly, but I like Dave Russell's "flag on the piston" idea.
Seems like the simplest. If you can't get a helper to watch - maybe you
could mount a video camera somewhere on the engine record the flag movement.
Then you could watch it later while you're NOT driving. Hey, how about
mounting an electronic tach & speedo in the frame too? Then you could
measure piston rise relative to mph and rpm. Mmm...maybe I'm making it too
complicated now! Anyway, can't wait to read what you figured out. Keep us
posted!
Donny V
'78 MGB
In a message dated 3/10/2003 5:38:52 PM Eastern Standard Time,
lrcar@red4est.com writes:
> Subj: measuring piston rise
> Date: 3/10/2003 5:38:52 PM Eastern Standard Time
> From: <A HREF="mailto:lrcar@red4est.com";>lrcar@red4est.com</A>
> To: <A HREF="mailto:mgs@autox.team.net";>mgs@autox.team.net</A>, <A
>HREF="mailto:british-cars@autox.team.net";>british-cars@autox.team.net</A>
> Sent from the Internet
>
>
>
> The application is my MGB with an HP supercharger.
>
> I'm simultaneously trying to get things dialed in and learn about what
> is happening with the motor, fuel/air ratios, power etc. I was able to
> sort of measure piston rise on the dyno, but that doesn't work the
> best under dynamic situations. I can't really have someone running
> along next to the car with a mirror and a ruler measuring piston rise
> as I drive down the road.
>
> The carb is an HIF-44. I've noticed that the damper cap does not have
> a vent in it like my old HS-2s and HS-4s did. I was considering
> getting another damper cap and attaching some sort of vacuum sensor to
> the damper cap and at least under steady state conditions that should
> correlate to piston rise.
>
> Is this likely to work? Has anyone already tried it? What is the
> "vacuum", or pressure differential actually in the dome?
>
> In almost unrelated news, I had an absolute blast at Drivers School
> last weekend as a student rather than a driver. I had all sorts of
> people complimenting me on the MG, and reminiscing about their own. I
> repeatadly and mercilessly blew the doors off a G Prod (though he was
> running DOT legal tires as I was) Datsun Fairlady 1600 Roadster.
>
> A longer story of the weekend will follow.
>
>
> Larry
>
>
> --
> I've found something worse than oldies station that play the music I used
> to
> listen to. Oldies stations that play the "new" music I used to complain
> about.
> lrc@red4est.com http://www.red4est.com/lrc
>
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