FYI: Dec 12 MythBusters: Airplane Hour

muff528 wrote:

Actually, they were quite simple to work on.....individually! The
trick was to get them to play together well. Very touchy adjustments,
especially if the carb (or engine for that matter) had any wear at
all. Then there was the problem of getting the carbs to do the same
thing at the same time, linkage-wise, which was not necessarily just
making sure that throttle positions on each carb matched. Their
performance was affected greatly by even a little wear. Kinda like
the Amal's on a couple of BSA's I had. TP

You got that right! Getting them syncd was a real PITA! I found a nice
little gadget that helped immensely, and by coincidence happened to run
across it about a week ago when looking for something else in the tool
chest. Here's a pic: http://www.members.cox.net/drpics/carbtool.jpg
Why I'm hanging on to it after 45 years is anyones guess, probably should
put it on eBay!!

But for watching what 3 SU's were doing simultaneously, it was great! The
pistons dropped in place of the damper and would rise/fall with the suction,
with the wire pointers lined up. Plus there were another half dozen tricks
you could do with it. The one that looks like a weird crank shaft was to
adjust the float arms. Beats the hell out of sticking your head in there
with a stethoscope listening to the hiss... d:-))

Cheers'n beers.. [_])
Don

I got good results from a piece of Tygon tubing. Just make sure you placed
the end at the same spot on each carb.

"ManhattanMan" wrote in message
...
muff528 wrote:

Actually, they were quite simple to work on.....individually! The
trick was to get them to play together well. Very touchy adjustments,
especially if the carb (or engine for that matter) had any wear at
all. Then there was the problem of getting the carbs to do the same
thing at the same time, linkage-wise, which was not necessarily just
making sure that throttle positions on each carb matched. Their
performance was affected greatly by even a little wear. Kinda like
the Amal's on a couple of BSA's I had. TP

You got that right! Getting them syncd was a real PITA! I found a nice
little gadget that helped immensely, and by coincidence happened to run
across it about a week ago when looking for something else in the tool
chest. Here's a pic: http://www.members.cox.net/drpics/carbtool.jpg
Why I'm hanging on to it after 45 years is anyones guess, probably should
put it on eBay!!

But for watching what 3 SU's were doing simultaneously, it was great! The
pistons dropped in place of the damper and would rise/fall with the
suction, with the wire pointers lined up. Plus there were another half
dozen tricks you could do with it. The one that looks like a weird crank
shaft was to adjust the float arms. Beats the hell out of sticking your
head in there with a stethoscope listening to the hiss... d:-))

Cheers'n beers.. [_])
Don

"LWG" wrote in
:

I got good results from a piece of Tygon tubing. Just make sure you
placed the end at the same spot on each carb.

Yeah, tha's the best way, really. I've used all the gadgets for them, the
wire incatoers put in the dashpots, the gauges, just listening to the
whistle in the pipe is probably the best.


Bertie