Do I need richer jets on my Autolite 2100?

[kerb12]

What A/F ratio should I be seeing during WOT? My wideband gauge shows that when I hit the gas I get a quick jump to about 10:1 and then it evens out around 12-13:1 until I let off the gas. My idle is at 13:1, so shouldn't I be going more rich when accelerating?

This is a freshly rebuilt Autolite 2100 1.08 with #50 main jets, direct mounted to a large log. My accelerator pump rod is set to the highest hole. Just curious if I could get better performance out of it.

 

[wsa111]

The ideal cruising ratio is 14.7, Wot of 12.8-13.1 is perfect. You can try the leaner accelerator pump stroke unless you get hesitation or a flat spot on initial acceleration.

 

[rbohm]

i agree with wsa111.

 

[kerb12]

Thanks guys, I'll leave the jets the way they are and maybe drop the pump rod down to the 2nd hole.

I'm really happy with the acceleration off the line, it just seems that once I hit about 45mph it feels like it runs out of steam. I was kind of hoping it was just a jetting issue. Maybe I need a bigger 2100? A 1.14 or 1.21?

 

[wsa111]

If you race your vehicle or do a lot of full throttle acceration, if you want to richen up just put one size larger jet in the front jet, remember liquid fuel runs to the rear of the manifold. To lean go one jet size smaller in the back jet.
Remember a dyno does not move so keep that in mind when getting an A/F ratio on a dyno. Bill

 

[kerb12]

Ah, good things to keep in mind. I haven't taken it to the track or to a dyno yet, this is all just street driving. I'm sure things will change when I do those though...

 

[autoX65]

If you race your vehicle or do a lot of full throttle acceration, if you want to richen up just put one size larger jet in the front jet, remember liquid fuel runs to the rear of the manifold. To lean go one jet size smaller in the back jet.
Remember a dyno does not move so keep that in mind when getting an A/F ratio on a dyno. Bill

very trick