Re: Slow runniing problems Stromberg carbs.
Posted: Thu Nov 24, 2011 6:24 am
When you blank off the rear carb you get twice the flow through the front carb feeding the rear cylinders through the balance pipe. You probably end up with a better and more stable mixture to all cylinders in this situation.
Have you had a look at the pistons in the carbs and see if they are stable at idle speed. If they are unstable and moving up and down this will produce the rough idle. Cause of unstable carb pistons can be things like worn dampers or wrong oil in the dmapers, or valve leakage or other leaks giving unstable manifold vacuum. The springs that act on the pistons also may need replacing if they have lost their tension
reards
Rohan
Have you had a look at the pistons in the carbs and see if they are stable at idle speed. If they are unstable and moving up and down this will produce the rough idle. Cause of unstable carb pistons can be things like worn dampers or wrong oil in the dmapers, or valve leakage or other leaks giving unstable manifold vacuum. The springs that act on the pistons also may need replacing if they have lost their tension
reards
Rohan