How's my timing/vacuum numbers? - Update: appears to be distributor failing
Recently put an edelbrock carb (#1406, 600cfm, electric choke) on my '71 351c 2v. I either didn't notice it, or only recently it's been running VERY VERY rich across the rpms. At idle its bad enough to make my eyes start burning really bad. The other night I was stuck in heavy stop and go traffic and it stalled out and could not be restarted, not by a long shot. I initially thought I lost all spark, but it appeared that it flooded out, after getting it towed back to my shop that night, it started and ran perfectly fine the next morning.
I have been having issues with hesitation/misfiring at low rpm + throttle application (heavy load). Tonight I retuned the idle mixture screws to the lean side (was riched out before) of the band, set the accelerator pump to the leaner setting, and adjusted timing to what appeared to run the best. It's still running very rich and at times dumping enough to start running rough and backfiring out the exhaust.
I need to know I've got my timing looking good before I start digging into the carb tuning. I'm not sure how much base timing I need, from what I read it appears 12-16 is appropriate for non-stock ignition.
I have an undercap hei conversion from points, accel super stock coil, plug gaps are at .035, I would like to regap to .045 after reading that it's appropriate for the non-stock coil.
First check of timing (that its been set at for 5+ years with no problem) showed 11-13 deg at idle, up to about 26 at full advance. A function check of the vac advance shows it adding about 12deg when connected.
The manifold vacuum appears very poor as far as I know. Fiddled with the timing, stepped up to around 16 deg at idle, saw 13-14in Hg, ramping up to 42 deg at full advance, with 18-20in Hg vacuum. There's a possibility that I had the vac advance reconnected during this test, as 42 sounds high in retrospect.
I suspect my issue is with a stuck float level in the carb. The carb has been on for several weeks and is only now giving me an issue to this extreme.
I'm extremely novice at carb tuning, I'm going to study the included manual and snag a 1487 tuning kit. I just want to be 100% sure my ignition is dialed in before messing with fuel.
Previous post/issues are here
Thanks again, signed the guy with the burning eyes.
Recently put an edelbrock carb (#1406, 600cfm, electric choke) on my '71 351c 2v. I either didn't notice it, or only recently it's been running VERY VERY rich across the rpms. At idle its bad enough to make my eyes start burning really bad. The other night I was stuck in heavy stop and go traffic and it stalled out and could not be restarted, not by a long shot. I initially thought I lost all spark, but it appeared that it flooded out, after getting it towed back to my shop that night, it started and ran perfectly fine the next morning.
I have been having issues with hesitation/misfiring at low rpm + throttle application (heavy load). Tonight I retuned the idle mixture screws to the lean side (was riched out before) of the band, set the accelerator pump to the leaner setting, and adjusted timing to what appeared to run the best. It's still running very rich and at times dumping enough to start running rough and backfiring out the exhaust.
I need to know I've got my timing looking good before I start digging into the carb tuning. I'm not sure how much base timing I need, from what I read it appears 12-16 is appropriate for non-stock ignition.
I have an undercap hei conversion from points, accel super stock coil, plug gaps are at .035, I would like to regap to .045 after reading that it's appropriate for the non-stock coil.
First check of timing (that its been set at for 5+ years with no problem) showed 11-13 deg at idle, up to about 26 at full advance. A function check of the vac advance shows it adding about 12deg when connected.
The manifold vacuum appears very poor as far as I know. Fiddled with the timing, stepped up to around 16 deg at idle, saw 13-14in Hg, ramping up to 42 deg at full advance, with 18-20in Hg vacuum. There's a possibility that I had the vac advance reconnected during this test, as 42 sounds high in retrospect.
I suspect my issue is with a stuck float level in the carb. The carb has been on for several weeks and is only now giving me an issue to this extreme.
I'm extremely novice at carb tuning, I'm going to study the included manual and snag a 1487 tuning kit. I just want to be 100% sure my ignition is dialed in before messing with fuel.
Previous post/issues are here
Thanks again, signed the guy with the burning eyes.