Ok, I'm putting the miles on the car and am noticing lots of stuff! I've been thinking for a while that the car seems to be running rich. (smells rich and there is some soot out the back) The carbs were adjusted in Redondo Beach, CA. during the PPI. The elevation there is 101 Ft. I'm in Ft. Wayne, Indiana where the elevation is 784 Ft. My question is: How much effect will 683 feet have on the carbs? Would this elevation difference cause them to run richer? TIA, JIM
Hi Jim, I don't know the answer to +700ft, but I can tell you that Ft. Lauderdale (about sea level) to Boulder, CO (5480ft) makes 'em run REALLY RICH. Smells like a go kart at the fun park. John
I'd agree. From what you say, might want to come down one jet size on idles and main. Pressure changes faster at lower altitide changes.
nada, to small to be an issue, sea level or 0' feet would be a pressure of 14.696 and 500' would be 14.43, at 1000' it is 14.16psia so from that your looking at a pressure drop of 0.26 ~.30
Ditto. And you can probably get that much pressure variance with a change in temperature. jim, Have you read Birdman's page on adjusting your carbs? You can also use (althought it's a real PITA) Colortune plugs to verify the mixture in each cyliner.
If you think it is clinically running rich for whatever reason, might not be a bad idea to look into it is what I am saying. Might be another case of those prolific .60 idle jets...
Oh yeah, I bet that changes things!!! I'll re-read Birdman's thread. I looked at during my Pre-Purchase investigations, but will need to check it out again. I'll let you know what I come up with. Thanks guys!! JIM
snj5 .. am I to take it that you don't like the 0.60 idle jets? Going up a size from 0.55 (stock) to 0.60 is one of the suggestions made in Birdman's excellent carb tuning tutorial. I'm led to believe that it helps compensate for the different burn qualities of modern gas versus the stuff that was available 30 years ago. I thought I'd better ask as I'm just about to make the switch myself!!!
Well, everyone has an opinion and this is just mine and the way I like to do it. We talked about this specifically starting in post #11, Zen and the Art of Weber Jetting: http://www.ferrarichat.com/forum/showthread.php?t=148103 Every car is a bit different, so requirements may vary and .60s may be the right thing in many cases. Anyone saying these are the 'best jettings' is probably best interpreted as 'the best place to start'. Birdman is a highly respected A-#1 genius in my book (as would anyone that would 'give' his wife a Ferrari), we just jet a bit differently.
