Wietse
Well-Known Member
From what i understand from the article mentioned in here is that for power you want to have a 12.8-13.2 figure.
Yesterday i also set the idle mixture screws again and got it at 14.2, which is close enough i guess, idles very nice now..just ticking over.
I am quite sure my idle screws are 1 turn open, most likely even less then that.
When monitoring the AFR readings, specially after changes made it becomes obvious that once you got the cruising figures better, you have to be careful you don't lean it out at heavy throttle.
It really is a matter of balance and an AFR meter is priceless imo if you want to play around with fuel settings.
For any readers interested, spend the money and install one. When i started i knew absolutely nothing about carbs and fuel settings/adjustments and i think it is really worth to be able to learn all this and tune your car yourself. (also FBBO member helping out and created my learning curve)
Regarding your hesitation and sky high lean figure might be sorted by adjusting the pump shot.
I got my pump arms set that once you just operate the linkage it sprays fuel, a little late and it stumbles.
As per manual you should have a certain clearance, but it is easy enough to adjust this by visual only.
Down the line, these engines are better off running on the rich side, as you mentioned that once getting too lean that mighty V8 power gets kinda lost.
I am still doubting a bit on my timing, i've been running it at 18* initial for some time and went to 20* now.
When adjusting to me it felt it wants more initial, just by listening how it run and left it where i felt it runs very strong and checked the timing with the light it was at 24* but to me this is a bit high.
Mechanical advance is 18* and all in at 2500 rpm, so i woud end up at 42* total which kinda scares me. (no vacuum advance installed)
Then again, i am running 98 octane pump gas which should allow me to go quite sharp in adjustments without causing ping issues.
Yesterday i also set the idle mixture screws again and got it at 14.2, which is close enough i guess, idles very nice now..just ticking over.
I am quite sure my idle screws are 1 turn open, most likely even less then that.
When monitoring the AFR readings, specially after changes made it becomes obvious that once you got the cruising figures better, you have to be careful you don't lean it out at heavy throttle.
It really is a matter of balance and an AFR meter is priceless imo if you want to play around with fuel settings.
For any readers interested, spend the money and install one. When i started i knew absolutely nothing about carbs and fuel settings/adjustments and i think it is really worth to be able to learn all this and tune your car yourself. (also FBBO member helping out and created my learning curve)
Regarding your hesitation and sky high lean figure might be sorted by adjusting the pump shot.
I got my pump arms set that once you just operate the linkage it sprays fuel, a little late and it stumbles.
As per manual you should have a certain clearance, but it is easy enough to adjust this by visual only.
Down the line, these engines are better off running on the rich side, as you mentioned that once getting too lean that mighty V8 power gets kinda lost.
I am still doubting a bit on my timing, i've been running it at 18* initial for some time and went to 20* now.
When adjusting to me it felt it wants more initial, just by listening how it run and left it where i felt it runs very strong and checked the timing with the light it was at 24* but to me this is a bit high.
Mechanical advance is 18* and all in at 2500 rpm, so i woud end up at 42* total which kinda scares me. (no vacuum advance installed)
Then again, i am running 98 octane pump gas which should allow me to go quite sharp in adjustments without causing ping issues.
