Technical > Spud Miller's Cave

Enderle barrel valve adjustment question

(1/3) > >>

tony1966:
First time working on mechanical FI and I am trying to get rid of an off idle stumble by richening up the idle mixture.  I had the leakdown set at 28% and figured out that one flat on the adjuster is worth about 2-3% at this point on the barrel valve.  What amounts to a sizeable change in leakdown?  I don't want to go too far, but don't want to make too small of a change.  It's not popping or breaking up at the hit of the throttle and with no load on the motor you really don't notice much of a stumble.

Thanks!

Tony

dreracecar:
Leak is only a number and not written in stone and alc is very forgiving. Make a coarse adj to see if going in the right direction. To be honest I dont know what my leak is and have not adj it in over 15 years, played with it in the beginning to get the off idle leave and havent touched it since.

wideopen231:
Not sure richening is correct way to go.Normally a slight lean would have lots of response. Will to rich might have stumble. 28% is very close in the ball park. Is sytem just rich?

Heck try 2 maybe 3 flats thats pretty big move IMO if does not work go back then 2 flats over direction.Remember theres plenty of fuel sitting there when you open barrle to full flow engine has to pull air in to mix with it .Its not like a crapurator where the incoming air pulls fuel.

 Without knowing full system its hard to say how to tune it with a edumacated guess.Pump size nozzle size  and main jet all play into it.

tony1966:
Thanks guys, the guy i who ran the car last told me he set it at 30%, but he typically ran 4000 ft alt.  After checking it again I saw I  had it set to 28% so I figured i better richen it up.  It doesn't build any heat at idle so I figured it can't be extremely lean.  I'm going to move it two flats richer and go from there.  if no improvement, i'll go the other way.

thanks for the direction!

ricardo1967:

--- Quote from: dreracecar on August 07, 2014, 09:25:13 AM ---... To be honest I dont know what my leak is and have not adj it in over 15 years, played with it in the beginning to get the off idle leave and havent touched it since.

--- End quote ---

On the same fuel pump?

Navigation

[0] Message Index

[#] Next page