One carb not drawing-what's up?

[jhv48]

Are you the guy that had the problem with valves that weren't closing completely?

With that compression figure I would do a leak down test on the two low cylinders and see where the air is leaking.

[Gaz64]

Jon,

You stated in your previous thread that your tight valves were the cause of your low compression and high leakdown.

On your Ford V8, cylinders 1 & 2 are side by side and fed by the same carburettor.

Did you have the throttle wide open permanently while you compression tested all 8 cylinders?

If you did, and now still have 65 in 1 & 2 and 160-180 in the rest, I'd be doing another leakdown test. BUT if the leakdown doesn't show your loss, you could have a split bore between cylinders.

If you didn't have the throttle wide open when you did the compression test, then if the affected cylinders were trying to draw through a almost closed carb, you get low numbers.

It is highly unlikely to have low even compression on adjacent cylinders due to unseated new rings.