Ideal AFR fuel curve - dyno results

[70GS455]

Some years ago I posted about a funny shaped fuel curve. After doing some dyno test recently, I believe I have sorted it out. It made 609 hp and 614 ft lb with a nearly perfect AFR curve, still a little fat. What I had to do:
Typical primary recipe
0.149" N/S
0.146" sec jet discs
Smoothed and enlarged passages in the floor under the discs
0.067" tip rods
Rear air door max opening set at 1.190" (1.230" made the same power)
Sec discharge nozzles shortened and angle-cut
sec air bleeds to 0.022", orifice at the top, soldered the bottom shut, 4 x 0.018" lateral emulsion holes at the bottom
POE re-fill orifice at 0.030"
Stock POE exit holes at 0.050"

Video of the pull:
https://youtu.be/kzp28GRsq4U?si=oI48_JYP03nLNFrM

[lightning boy]

Wow, GS that's impressive, I remember the post. Can you go into more detail with the sec bleed tubes? Maybe some pics. So you put removable jets in the top and cross drilled the bottom of the sec air bleeds?

[70GS455]

Wow, GS that's impressive, I remember the post. Can you go into more detail with the sec bleed tubes? Maybe some pics. So you put removable jets in the top and cross drilled the bottom of the sec air bleeds?

I won't have any pics until the next time the carb comes apart.
I didn't add any jets, just soldered the top closed then re-drilled. Makes it easier to tune if needed. Yes, cross drilled the bottom with 4 smaller holes. Then closed the very bottom opening. That way emulsion air is not fighting fuel coming up.

[77cruiser]

Like this?

[70GS455]

Like this?

Yes, but I left the POE tubes alone

[novadude]

Thanks for sharing.  On the graph, what is "L1" vs "L2"?

[70GS455]

Thanks for sharing.  On the graph, what is "L1" vs "L2"?

L1 is driver's side AFR and L2 is passenger

[lightning boy]

just curious, what was the distance between the tubes and the air doors? How much did you shorten the main discharge nozzles?

[70GS455]

just curious, what was the distance between the tubes and the air doors? How much did you shorten the main discharge nozzles?

I angle cut them. Left the top alone and cut the bottom of the tube back to the baffle.