The art of setting up Carbs in 2016 - Page 2 - Alfa Romeo Bulletin Board & Forums

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post #16 of 64 (permalink) Old 10-05-2016, 07:36 AM Thread Starter
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How about answering my actual question?

My mounts are air-tight. No problemo anymore.

My carb books and most references here say that the screw should be fully screwed in and i just wonder with how much force they should be screwed in, after all half a turn makes a big difference thus i'm wondering.

Thanks again.

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post #17 of 64 (permalink) Old 10-05-2016, 07:52 AM
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ok, thumb on one side of the screwdriver, forefinger on the other side.....

Gently turn the mixture screw in until it stops. Do not force it as you can damage it !!

Glad to be helpfull !

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post #18 of 64 (permalink) Old 10-05-2016, 08:53 AM
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Wink

Quote:
Originally Posted by AlessandroM
How about answering my actual question?
How about looking for local help ?

Kruzifix,
das kann doch nicht wahr sein daß man ein 3/4 Jahr zum Vergasereinstellen braucht. Ihr macht irgend etwas grundsätzlich verkehrt, scheint mir. Wennst nicht klarkommst, schick mir eine PM und notfalls komm' ich halt vorbei. Bin grad mal knapp über 200km weg.

Offered to help locally if they can't fix it.
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post #19 of 64 (permalink) Old 10-05-2016, 12:18 PM
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Quote:
Originally Posted by 101/105guy View Post
Oh, and those solid carb mounts....
many experienced mechanics have a hard time keeping them from leaking air.
What a load of bunkum.

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post #20 of 64 (permalink) Old 10-05-2016, 12:26 PM
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What a load of bunkum.
Exactly. But who knows how "experienced" is specified in this case.....

Last edited by hunttheshunt; 10-05-2016 at 12:28 PM.
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post #21 of 64 (permalink) Old 10-05-2016, 12:33 PM
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Well....
there is this local electrical engineer who fought mightily with different types of washers, seals, tourque settings....
Finally gave up and solidly bolted them on.
Sort of defeats the design, don't you think ?
There are several conversations about these.

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post #22 of 64 (permalink) Old 10-05-2016, 12:44 PM
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There are no conversations about air leakages when the solid mounts are professionally fitted. But there a lot of conversations about problems with setting up carbs by people who don't know what they do. It's the same.

Mr Chapman was right when he said:

"Make the suspension adjustable and they will adjust it wrong -- look what they can do to a Weber carburetor in just a few moments of stupidity with a screwdriver."
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post #23 of 64 (permalink) Old 10-05-2016, 12:46 PM
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"But there a lot of conversations about problems with setting up carbs by people who don't know what they do. It's the same."

My point exactly !!

Thanks !

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post #24 of 64 (permalink) Old 10-05-2016, 01:53 PM Thread Starter
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Quote:
Originally Posted by hunttheshunt View Post
How about looking for local help ?

Kruzifix,
das kann doch nicht wahr sein daß man ein 3/4 Jahr zum Vergasereinstellen braucht. Ihr macht irgend etwas grundsätzlich verkehrt, scheint mir. Wennst nicht klarkommst, schick mir eine PM und notfalls komm' ich halt vorbei. Bin grad mal knapp über 200km weg.

Offered to help locally if they can't fix it.
Ich verstehe nicht ganz weshalb hier alle das Gefühl haben, dass man ein 3/4 Jahr am Stück am selben arbeitet, nur weil man auf seinen alten Thread zurück kommt- ich bin just nach vielen anderen Tätigkeiten an mehreren Fhz dazu gekommen mich darum zu kümmern, habe mich informiert und hatte ein Detailfrage, da ich bisher keinen sauberen Lauf hingekriegt habe.


And now in english:
I don't get why people assume that one has been working on the same things for 9 months only when he is coming back to a thread he originally started. I've just been busy working on other parts of the car. Anyway, I had a simple question because for some reason I wasn't able to get a steady idle, the mixture was either too rich (popping out of the exhaust) or too lean (Popping toward the intake). Thus i was wondering whether there might be a problem with my idle mixtures screws or whether i have to look elsewhere.

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post #25 of 64 (permalink) Old 10-05-2016, 03:59 PM
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With the engine idling at about 1000 rpm, screw each mixture screw in and out and note the change in rpm. Then adjust for maximum rpm. Do not assume that they will all be the same number of turns from full closed. You may have to open each one by an extra quarter turn for best performance.

Ed Prytherch
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A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #26 of 64 (permalink) Old 10-06-2016, 01:32 PM Thread Starter
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Hi Richard

I did that already, and it would idle, yet it still pops sometimes (both ways) and stumbles when taking the foot from the accel, which as far as I understand, can be explained by air leaks. weird thing is i rechecked the seals again and again, by pushing the carbs down and upwards and by spraying starter fluid, and it doesnt react at all to it.
I'm under the impression that the jets have already become blocked/dirty again after the rebuild which would explain why #1 doesn't seem to react too much to adjustments to idle mixture screw. From reading the forum this seems to happen to some people after rebuilds.

I will recheck all jets again.

Thanks a lot to all the people trying to help me,
Alessandro

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post #27 of 64 (permalink) Old 10-06-2016, 02:49 PM
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Maybe one of your throttle plates is not closing all the way due to misalignment or a twisted shaft, allowing mixture through one cylinder and into the exhaust on over run.

Ed Prytherch
79 Spider
85 GTV6 3L
76 Suzuki GT500

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #28 of 64 (permalink) Old 10-06-2016, 02:52 PM Thread Starter
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Unlikely as i rechecked them twice by pouring fluid on top and making sure it doesnt leak - it didn't. After all that was the only part i did not touch because of everyones feedback of how hard it is to get it right.

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post #29 of 64 (permalink) Old 10-06-2016, 03:58 PM
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remove the screw covers over the progression holes and observe the edge of the throttle plate. It should be in exactly the same position in all of them.

Ed Prytherch
79 Spider
85 GTV6 3L
76 Suzuki GT500

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #30 of 64 (permalink) Old 10-06-2016, 04:08 PM
I find it interesting that the people that commonly make asinine posts rarely have anything constructive to say. Ultimately I just don't bother reading their posts...

If you think the springs are holding up the idle screws from seating try removing the springs and then seating them noting if they've dropped further. I don't think there would be any harm in running without springs except that they could vibrate in or out.

Did you change idle screws? There are a variety of screw tip styles.
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