View single post by DonBurns
 Posted: 07-16-2019 08:33 pm
PM Quote Reply Full Topic
DonBurns

 

Joined: 09-18-2015
Location: Fullerton, California USA
Posts: 147
Status: 
Offline
 It's been awhile since I posted to this string. I have continued to fiddle with things and took the car to someone with more knowledge of Delortos in the meantime. Still not where I need to be, though.

I hope someone can answer a question about A/F meters. I gave up on my first meter, an Innovate Motorsports LM-2 because it kept freezing after a few minutes, and went with an AEM 30-0300 X-Series. Can someone tell me their experience of how stable the reading should be? Mine jumps so much I have difficulty guessing at an average. Seems like there should be a setting to damp the reading.

Near as I can tell, my A/F readings are

1000 rpm 13.2
2000 rpm 17.5
3000 rpm 16.5
4000 rpm 16.0
5000 rpm 14.0

so idle looks OK (adjusted that using the screws - approximately 4 turns out), and using 7850.8 and 55 tube and jet.

Looks like it jumps to very lean, and then drops down to reasonable at higher rpm. Is that controlled by the emulsion tube? Currently 7772.8 and 170. I did not see this before the last carb expert made some changes. It was the same main emulsion tube but 160 jet. At that time A/F was pretty consistent at 13.5 to 12.1.

Mainly I am wondering if the readings are real, but I suspect so as I think I am getting spitting at the 2000 - 4000 range.

BTW - I have a Carb-Tune Pro, and check it often for balance.