Crashtd420 Posted March 23 Report Share Posted March 23 29 minutes ago, 510_dreamin said: Unfortunately I have no idea. They’re the same model carbs (40dcoe) but that’s all I know. I was surprised to see them changed out by the shop in the first place. I asked for the ones I had to serviced and it turned into a swap out since mine allegedly needed a rebuild. That could be some of the reason why it feels different when driving.... It's definitely tougher when you question 2 items as an issue.... Have you done anything lately with the carburetors or are you just playing with the distributor? Quote Link to comment
Crashtd420 Posted March 23 Report Share Posted March 23 Also did you catch the question about your vacuum source? Are you in fact using the map curve? Quote Link to comment
alfa7kar Posted March 23 Report Share Posted March 23 I have a 123 on my 510 with a l20b with a weber 38. Your ignition map looks really close to mine I also do not run the map/vac i just zeroed it out and it is not conected. I run just regular unleaded 87 with no pinging even in the summer. maybe you got some bad gas it happens also i had a 521 with a l20b that would ping and deisel i just ran chevron 91 and it solved the problem. Quote Link to comment
alfa7kar Posted March 23 Report Share Posted March 23 (edited) also can you confirm with a timing light that you are close to what the curve says at idle. it would really be confusing for you if it was off that might be a problem if it was set advenced say like 25 deg at idle but the curve says 15 Edited March 23 by alfa7kar 1 Quote Link to comment
Crashtd420 Posted March 23 Report Share Posted March 23 1 hour ago, alfa7kar said: also can you confirm with a timing light that you are close to what the curve says at idle. it would really be confusing for you if it was off that might be a problem if it was set advenced say like 25 deg at idle but the curve says 15 This is actually something good to verify if you haven't... I remember having to adjust the timing slightly after following the setup instructions to get the 123 to read the same as the timing light... Quote Link to comment
510_dreamin Posted March 24 Author Report Share Posted March 24 8 hours ago, alfa7kar said: I have a 123 on my 510 with a l20b with a weber 38. Your ignition map looks really close to mine I also do not run the map/vac i just zeroed it out and it is not conected. I run just regular unleaded 87 with no pinging even in the summer. maybe you got some bad gas it happens also i had a 521 with a l20b that would ping and deisel i just ran chevron 91 and it solved the problem. I don’t have anything set up for the map I should probably zero mine out as well. I have dieseling too most time. I just filled up with a fresh batch of chevron 91, usually all I run or shell 91. California gas though. timing light is a good idea. I’ll look into that. I might work on adjusting the carbs too and see if I can smooth them out a bit. thanks everyone for all the help. I feel it’s getting better and better with each suggestion you all have, what a great community! 1 Quote Link to comment
datzenmike Posted March 24 Report Share Posted March 24 Dieseling on shut off? Try setting 12 degrees just for idle. Quote Link to comment
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