• Required reading for all forum users!!!

    Welcome!
    Register to access the full functionality of the GSResources forum. Until you register and activate your account you will not have full forum access, nor will you be able to post or reply to messages.

    A note to new registrants...
    All new forum registrations must be activated via email before you have full access to the forum.

    A Special Note about Email accounts!
    DO NOT SIGN UP USING hotmail, outlook, gmx, sbcglobal, att, bellsouth or email.com. They delete our forum signup emails.

    A note to old forum members...
    I receive numerous requests from people who can no longer log in because their accounts were deleted. As mentioned in the forum FAQ, user accounts are deleted if you haven't logged in for the past 6 months. If you can't log in, then create a new forum account. If you don't get an error message, then check your email account for an activation message. If you get a message stating that the email address is already in use, then your account still exists so follow the instructions in the forum FAQ for resetting your password.

    Have you forgotten your password or have a new email address? Then read the forum FAQ for details on how to reset it.

    Any email requests for "can't log in anymore" problems or "lost my password" problems will be deleted. Read the forum FAQ and follow the instructions there - that's what we have one for...

  • Returning Visitors

    If you are a returning visitor who never received your confirmation email, then odds are your email provider is blockinig emails from our server. The only thing that can be done to get around this is you will have to try creating another forum account using an email address from another domain.

    If you are a returning visitor to the forum and can't log in using your old forum name and password but used to be able to then chances are your account is deleted. Purges of the databases are done regularly. You will have to create a new forum account and you should be all set.

Which first?

  • Thread starter Thread starter Tzian
  • Start date Start date
Tzian said:
Which do you do first, the carb sync or adjusting idle mixture?
Click to expand...
Given the choice of just those two items, you should do the carb sync first, but keep in mind that you should check valve clearances FIRST.

The reasoning behind the 'sync first' is that you need to make sure all the carbs are working, contributing to the general operation of the engine. If, for example, one carb is virtually closed, it won't matter how much you turn the mixture adjustment screw, you won't see any change in the way the engine runs.

Following that 'throttle response' procedure is probably the best, but you can get real close if you use the vacuum gauges first. And, since they are already connected to do the carb sync, it's just one more step.

After doing the carb sync, watch the gauges and adjust the mixture screw on carb #1 (order is not really important, as long as you get them all), watching for changes in vacuum. When the engine is running at fastest idle (due to an ideal mixture), you will have a slightly higher vacuum in all cylinders. As you turn the mixture screw in a bit more, it goes away from that "happy" mixture and the engine will slow down, yielding a slightly lower vacuum. Go back to the highest vacuum level, move to the next carb. Repeat as necessary.

When you are done with that, you can verify by using the 'throttle response method'.
I have never had to re-tweak the mixtures after using the vaccum method first.

.
 
Thanks for the explanation Steve, and yes we have done the valve clearances and put new shims in where needed :D

Just setting up now, keep your fingers crossed for us :P
 
well we got the carbs balanced but just as we finished doing that her revs dropped and she conked out, she is hot now and it is late so giving up for the night before i naff off the neighbours too much, hopefully she will start up fine again in the morning when cool.

then i can try for this idle mixture setup
 
You must log in or register to reply here.
Back
Top