Joined
·
756 Posts
Hey guys,
I've got a problem with my timing where I'm getting maximum vaccum advance at idle.
I'ts a rebuilt dual port 1300 engine. Currently has a 31Pict-3 carb & a geunine Bosch 034 SVDA distributor. It's been running great but having issues with it advancing properly without it hesitating and getting flat spots.
I've set the mechanical advance (with the vacuum line plugged) at 3500rpm + at 30deg BTDC - this results in a 7.5deg BTDC at idle.
However when I go to attach the vaccum line the idle jumps to about 14deg BTDC?? The Vacuum line is attached to the left side of the carb and not the other port facing the rear (for retard line).
I've sprayed carb cleaner in all the suspect areas checking for air leaks when running but the idle speed doesn't change. The Carb has all been rebuilt as well and tuned to spec.
Funny enough, I ran the car just today just on the mechanical advance alone, with the vacuum line plugged and it ran much better with the flat spots practically gone.
Is my carburettor just junk or is there something else i'm missing?
Any help would be great.
Thanks.
I've got a problem with my timing where I'm getting maximum vaccum advance at idle.
I'ts a rebuilt dual port 1300 engine. Currently has a 31Pict-3 carb & a geunine Bosch 034 SVDA distributor. It's been running great but having issues with it advancing properly without it hesitating and getting flat spots.
I've set the mechanical advance (with the vacuum line plugged) at 3500rpm + at 30deg BTDC - this results in a 7.5deg BTDC at idle.
However when I go to attach the vaccum line the idle jumps to about 14deg BTDC?? The Vacuum line is attached to the left side of the carb and not the other port facing the rear (for retard line).
I've sprayed carb cleaner in all the suspect areas checking for air leaks when running but the idle speed doesn't change. The Carb has all been rebuilt as well and tuned to spec.
Funny enough, I ran the car just today just on the mechanical advance alone, with the vacuum line plugged and it ran much better with the flat spots practically gone.
Is my carburettor just junk or is there something else i'm missing?
Any help would be great.
Thanks.