This may sound funny... but to perform a test to determine
the 'source' or the problem first.
Pull the carbs off the car. Use a vacuum cleaner to test
how high/fast the piston rises
I use a carboard tube with a hole in it and a second tube
around which I can slide up the tube to close off the hole
in the side of the tube to control how much vacuum the
carb sees. This will allow you to determine the 'energy'
required to lift the piston and to 'match' the pistons.
Now... the reason to go through this? It's an easy way to see
if it's the engine piston balance problem front/rear not
pulling the same air, not pulling enough air, verify a vacuum
leak on your intake manifolds or some other problem.
BUT most important.....
If using the vacuum cleaner, you can play with various 'ports'
on the carb and not worry about gasoline or it's effects on
the engine (rich/lean etc) You can test it with/without dashpots etc.
Paul Tegler ptegler@gouldfo.com www.teglerizer.com
----- Original Message -----
From: "Scott Tilton" <sdtilton@yahoo.com>
To: <ArthurK101@aol.com>
Cc: <triumphs@autox.team.net>
Sent: Tuesday, January 15, 2002 7:57 AM
Subject: TR-4 Stromberg Piston update (long)
So Last night I checked the rear stromberg first. (it is the one one with the
slow rising piston.) The diaphragm looked fine and everything seemed to move
smoothly. I cleaned it up and put it back together. AFterwards I checked the
piston travel . . it fell smoothly all the way to the bottom and gave the
required metalic click when it hit bottom.
So then I moved on to the front carb.
It also seemed fine with the exception that it was missing the little washer
that goes under the spring. (above the air valve piston)
I find it hard to believe that this ultra flimsy spring, much less the little
washer that it rests on, can noticeably affect how quickly a piston rises or
falls. None the less, I went and found another washer in a spare carb and
installed it. (found that the same washer was missing in first two spares that
I tried.)
Everything went back together and I started the car. Same result: rear carb
piston doesn't raise as much or as fast as the front when the throttle is
opened.
I shut the car off and decided to raise and drop the pistons and see if they
fall at a similar rate . . . before I got there though . . I noticed that I
could feel a most definite difference in the amount of force required to lift
the pistons. The rear is much harder. As if the oil in the rear carb was gear
oil. (it wasn't of course)
I unscrewed the dampners from the top and switched them, front carb to rear.
Same result.
Right about then my wife came and gave me a disapproving look for not eating
the food she had made for me. (rightly so)
That ended the night's investigation.
Anyone want to suggest what to check out next or guess what I'll find?
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