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January 22, 2004
David...
A flat spot (most especially with a VP3
Kent 276+ cam) is not unusual with a
45DCOE using the larger 4.5 or 5.0
aux venturi. You will notice this carb
configured for racing uses the smaller
3.5 aux vent which brings the main
system "in" a little earlier in the game.
Was using 1.4+ intake valves and a
VP3 cam.
Noticing this, I changed out my 4.5's
for 3.5's and jetted upwards accordingly
to 145 mains and 175 air correctors while
retaining the 50F9 idle jets the carb
came with.
(Then I rechecked the ign. timing to make
sure I wasn't overadvanced.....not).
Better with the 3.5's.....now
no flat spot on acceleration except
at immediate WOT from idle, so
went up .05 on
the pump jets. Solved the problem.
Cap'n. Bob
'60 :{)
PilotRob@... 28487
Posted on January 22, 2004 06:13 AM
Posted to category(s) Carburetor | Cylinder Head | Engine (external) | Engine (internal) | Intake System | Lubrication System | Racing | Tuning
