carburation
Posted: Wed Jul 12, 2006 8:34 am
Morning all!
Not an elan problem but I've not had any response from the Excel owner forum so apologies.
I've run a non se excel as an everyday car since 2000 without real problems but have never been able to work out the following-
The car always runs faultlessly- idles pefectly "flat" (if that's the correct expression), never fouls plugs, no flat spots etc but why do the idle screws on the forwardmost carb require a lot more turns outwards than the other?
I first thought that maybe the previous owner had opened up the air bleed screws by too much and that to compensate for the increased airflow the mixture strength had to be increased (if this is how they work that is) but starting from scratch and closing them all down then rebalancing the airflows disproved this.
All jets are correct, as are chokes, float heights, no air leaks, compressions equal, valve clearances to half thou from maker spec- in short I've checked all of the obvious. My elan uses similar dellortos and these I bought new about 8 years ago. The idle screws on these are all approx the same turns out.
Any ideas ?
In anticipation- thanks for the input.
John
Not an elan problem but I've not had any response from the Excel owner forum so apologies.
I've run a non se excel as an everyday car since 2000 without real problems but have never been able to work out the following-
The car always runs faultlessly- idles pefectly "flat" (if that's the correct expression), never fouls plugs, no flat spots etc but why do the idle screws on the forwardmost carb require a lot more turns outwards than the other?
I first thought that maybe the previous owner had opened up the air bleed screws by too much and that to compensate for the increased airflow the mixture strength had to be increased (if this is how they work that is) but starting from scratch and closing them all down then rebalancing the airflows disproved this.
All jets are correct, as are chokes, float heights, no air leaks, compressions equal, valve clearances to half thou from maker spec- in short I've checked all of the obvious. My elan uses similar dellortos and these I bought new about 8 years ago. The idle screws on these are all approx the same turns out.
Any ideas ?
In anticipation- thanks for the input.
John