23-06-20, 08:17 AM
(22-06-20, 08:36 PM)Grahamm link Wrote: I hooked them all up to #1 cylinder to check how much (if any) they were off from each other.
If you telling me that every gauge gave a different reading when hooked up to No1?
If that is the case and all the connections are good, the gauges are unusable. Sorry to say that but if they can't all read within about 0.1Hg of each other on the same cylinder, you've got no chance unless you can calibrate them within 0.1Hg.
Quote:The problem is that, no matter how much I change the screws, I get very little movement on the needles.
What I might do next is try increasing the idle speed, then turn all the screws down until it's almost on the verge of stalling.
Hopefully with the screws right in, any adjustments would be more noticeable.
Providing there's nothing wrong with the throttle bodies, or air leaks. What you're describing is typical of faulty or poor quality gauges. The gauges you're using I seem to remember were offered (at the time) as a cheaper alternative to Davida, they work but aren't the same quality, in my experience and from feedback over the years they don't last.
Even Davida aren't the same quality, mine are over 30yrs old, they can be calibrated, newer versions I've seen can't be. Either, you've got air leaks and/or you can calibrate these gauges, failing that borrow or buy some Davida's, or carbtune I think they're called, not a fan of the latter but others like them.
Later