How much will going from 90 degree summer to 50 degree fall affect A/F?

[XH29N0G]

Continuing with the quest to set the accelerator pump up right yesterday (our first day in the 50's - all others were done in 90 degree summer weather), I found that even after warming up the car, I had a lean spot with the A/F right when I depress the accelerator.  What had been a small quarter second spike from idle to about A/F = 15 before the pump shot appears, was A/F = 17 or so.  All else looks similar. 

My suspicion is that the manifold might be just that much hotter when it is 90 to vaporize/atomize the gas better.  Does this make sense or is it something else?

[Challenger340]

Took mine for a drive the other day on a 45-50* cold morning... similar accelerator pump "bog" that was pretty pronounced in the cold air, even after well warmed up.
Seems I just don't have enough "squirt" to cover the colder denser air ?
Although,
Mine works great at anywhere between 75-95* so I am thinking the Colder Air makes a BIG difference !
Factory Carter VS #4618S, original carb.

I am not going to try and tune the cold air bog out out of mine... simply because it works so well(no Bog) in warmer air when I do 99% of my driving.

[firefighter3931]

The colder air does make a big difference. 

Try jetting up 2 sizes and have a look at the AFR's 


Ron

[XH29N0G]

Ron and Challenger340,

I'll need to do a few more tests, but I think WOT A/F is also high and this would make a difference and I'll do the switch.  Thanks I continue to learn about the car.