Originally Posted by slimvulcanrider
Merc, you mention that the needle valve is your limiting factor, that is ours as well, that is why we use the #4 washers on the needle valves
By needle valve I meant the float needle / fuel valve. No spacers on that.
We are talking fuel flow INTO the bowl.
Or at least I am.
Wmsontas calculation was quite configured for max HP.
With my HP based on the dyno I need to flow 11oz of fuel a minute or something like that.
When I first conducted the test it was 5oz, I cleaned it all out then I got 12oz, that is when my WOT issue went away after clearning up the float needle.
You can put a 8" diameter line into a 1" hole, but it will only flow as fast as the 1" that is my point.
Hi flow is not going to make my needle and float go any faster.
I conducted all my tests with the fuel valve at prime, so vacuum pulses have nothing to do with it, in my case anyway.
I am no carb expert but I know with my single carb I got it tuned pretty well. I have a pilot jet, main jet and needle. Also have the A/F screw too.
I did my tuning using an innovative LM-1 lambda meter and checked it unloaded at multiple RPM. Then I even did some graphs of loaded (real running) while having that beer stein looking thing stick out the exhaust.
Then checked on a real dyno / performance shop and they said it was good, so I am happy.