Holley/Demon Carb stumble
Trouble is IIRC that car never cruises on a highway. LOL :)
My sense is that its worth trying a higher opening power valve.
Reading post 651.
The engine goes flat? as the car launches.
Remind us, rpms are what at launch?
Load must be high as the car has risen. Would be interesting to see the vacuum but its got to be close to atmosphere as the throttle goes to the floor.
@mderoy340 may know and his car launches well.
The tricky thing with the air is going bigger with the bleed or upper e-hole is that it can actually move more fuel at the begining of flow.
In my experience, it has seemed to me when experimenting that even at slow idle, the idle air flow is already in he upper half of its maximum capacity.
I picture it like this. And at launch, if the idle circuit is contributing its got to be close to 100 % of what it can flow.
If the main circuit is in the start up of flow, then it could be a slighly larger MAB or top e-hole could get fuel delivery moving sooner (richer).
I just don't have a good picture of where the airflow is on the carb during a launch like yours.
What I've always said, and try to do, is make changes to the Main Air Bleeds to adjust the fuel curve to be flat from mid rpms to redline in top gear (highest loads).
Then change e-bleeds if the begining if the transition or start up of the main circuit seems messed up.
Trouble is IIRC that car never cruises on a highway. LOL :)
My sense is that its worth trying a higher opening power valve.
Reading post 651.
The engine goes flat? as the car launches.
Remind us, rpms are what at launch?
Load must be high as the car has risen. Would be interesting to see the vacuum but its got to be close to atmosphere as the throttle goes to the floor.
@mderoy340 may know and his car launches well.
The tricky thing with the air is going bigger with the bleed or upper e-hole is that it can actually move more fuel at the begining of flow.
In my experience, it has seemed to me when experimenting that even at slow idle, the idle air flow is already in he upper half of its maximum capacity.
I picture it like this. And at launch, if the idle circuit is contributing its got to be close to 100 % of what it can flow.
If the main circuit is in the start up of flow, then it could be a slighly larger MAB or top e-hole could get fuel delivery moving sooner (richer).
I just don't have a good picture of where the airflow is on the carb during a launch like yours.
What I've always said, and try to do, is make changes to the Main Air Bleeds to adjust the fuel curve to be flat from mid rpms to redline in top gear (highest loads).
Then change e-bleeds if the begining if the transition or start up of the main circuit seems messed up.
