Because of all the help I recieved here in the past, my 2150A equipped 2.8 has been running well, thanks!

One thing that occurred to me is that back when I was adjusting the mixture screws the engine wouldn't idle smoothly enough at the time for me to accurately adjust the idle mixture at anything less than 950rpm, which now I'm thinking, if I was adjusting the idle mixture screws then it should have been done at IDLE rpm, duh!

Anyhoo, I'm going to readjust the mixture the 'correct' way this time.

Question, do you guys adjust both screws at the same time for highest rpm, or do you adjust one at a time for highest rpm then move over to the other for adjustment?

 

Or, does it really matter?

I thought that each mixture jet affects only one side, or one bank of cylinders, maybe incrementally adjusting both of them at the same time would make sense since while in operation, both sides, or cylinder banks, are firing.

 

Hi,... I know this Post is a few months old but.... since no one replied I'll post.

Who knows,... someone might run across this post while doing a search on this subject.

Anyhoo, You want to go back and forth adjusting the idle screws but, .... to do this correctly use a vacuum gauge connected to manifold vacuum. Go back and forth on the screws adjusting for the highest vacuum signal... not highest idle speed. You may find that they go hand in hand but not always.

These screws only effect the carb at idle speeds. Once the engine comes off idle you are running more on the primaries and you won't get much (if any) effect with changing them.

Important: If you start adjusting... looking for the strongest vacuum signal and the idle increases... stop and lower the idle speed with the idle speed adjust. Then go back to the idle screws adjustment. It's important to keep the engine in the idle speed range while adjusting idle mixture screws.