Originally Posted by
mud713
Deacon... i really dont think you know what you are talking about.... i have always kept the timing at 0 degrees..only when i race do i change it up to 10 degrees advanced for more power... timing at TDC has never given me a problem....its the carb...i screwed in the air fuel mixture screws all the way which should raise the idle even more.....it didnt....i backed them all out almost all the way....still no change.....I am cleaning up my Demon 750 and gonna try that carb...I have never had an issue with idleing at 0 degrees...so i have no clue what or if you even know hw to tune carb cars....i need someone with experience ....like me......to help...not an import computer tuner..
i think, if you found someone with experience, like you....you'd still be in the same situation, and wasting twice as much oxygen.
will a car run at 0* timing, eh maybe, but pretty shitty. currently i am at a loss to think of any engine equipped with spark plugs that does not fire before TDC. for the simple reason the chain reaction of igniting the fuel doesnt happen instantaneously...im not going to go on a timing rambling or how the flame front travels and how the stroke gains or loses efficiency...i am just going to tell you, running 0* of timing is not what it is supposed to be at...especially a SBC...hell, i am not even going to ask how you worked out that special number of 10* advance for more power, cause i can probably go ahead and say its just some wild ass number someone pulled out of their ass.
anyways.... the typical way of setting up your carb is idle the engine till its warm, adjust the idle speed screw to an rpm suitable for your setup, i needed mine at 1000, but i had a somewhat big cam, if your stock or close to it, ya only need to go around 800 or so.
and by what you wrote in what i quoted, it sounds like you don't know what the idle mix screws are even for. so go get a vacuum guage, plug it into your manifold, and with the car running mind you...and warmed up...turn them all the way in and back them out 1/4-1/2 turn at a time..backing each out equally. do that until you get the most vacuum possible from the guage...we do this so those snazzy little things that slow your car down, work.
when you get done with all that let me know how it turned out, till then, im going to go put the new tune on my intake and exhaust integra
