The Jalopy Journal
I tried going down a size on the pump shooter, but that’s not doing much once the power valve opens.
I’m probably going to try that, but it’ll be a couple of weeks. Or maybe sooner.
Well, more advance got me some detonation, so back to the medium springs I go.
I picked up a new 6.5 power valve this morning. Compared it to the old one, and there is a difference. Old one, fully open: [ATTACH] New, fully...
It’s a mechanical analog computer.
A good point. Intake is an Edlebrock Performer. Plug says lean / ok. #8 was 135 PSI a couple years ago going by my old notes.
Also, I was surprised to see just how little throttle movement drops the vacuum so quickly. That was interesting. I expected mashing the pedal...
Here is a run showing the a/f and vacuum: https://youtube.com/shorts/XHQz_K5XT40?feature=share The sound is mostly wind noise, but you can hear...
I spent most of my life troubleshooting and keeping track of complex information. I just don’t have the experience in carb tuning that I’d like to...
Both old and new vacuum advance cans work and hold vacuum when pulled in. Confirmed with vacuum pump. It’s not a surge at cruise. It’s a surge in...
Carbs aren’t simple. They are a complicated mechanical device that runs on vacuum and springs, with finely machined passages and holes, attempting...
Yes, exactly. Also, if you’re not from the midwest, “hill” is any change in elevation. There is a hill ahead here: [ATTACH] It’s not like a...
It’s a crossfire cap. 5 and 7 are next to each other. Nothing I can do about that.
I don’t think it’s carbon.
Updates… I loaded up the parts cannon and fired it. New cap, rotor, coil, pickup coil, module, vacuum advance, and wiring harness. The mechanical...
So it’s “medical stuff for wife” week here, but between appointments and tests and stuff, I got some garage time in yesterday. I don’t have a...
Can’t currently rule it out, but it hasn’t vapor locked in the previous bunch of years, including much more heat stressful events like sitting in...
I think I’m running the .045 gap. I’ll check that though. Stuck in a doctor waiting room here this morning, waiting for wife. Garage time is on...
It’s a 37 Chevy, so the hood has louvers (side) from the factory. The inner fenders are missing, so there’s a lot of airflow past the engine. Not...
Yeah, it’s basically the highest load on the engine is when it does it. Can’t reproduce it in the garage, that would be too easy. Don’t have a...
Thanks. Not sure that would help. If I can’t get it to do it with the parts I have, changing parts won’t show anything. I’m not opposed to loading...
Thanks. I have the ground wire style, no strap. Grounds are funny things, electricity will find one. The trick is making sure that it finds the...
Exactly.
Pickup coil wires is interesting, I’ll check that. Would an intermittent open wire at the pickup cause a backfire at the carb? I’d expect it to...
Yeah, a ‘scope might have been helpful, but I don’t have one of those. Don’t know anyone who does, either. Just have the basic home garage tools...
Fuel seems like it was ok. Major brands (Shell, BP, Mobil), nothing from off brand stations. Having run 40-50 gallons through it, seems like it’s...
Hmm. So, in trying to get to the tach connector, perhaps I disturbed the battery connector next to it. Wasn’t loose, firmly clipped in place with...
All 8 wires seemed well connected to the cap. A firm tug removed them. A decent “click” of the terminal going on the connection when reinstalled.
It seemed dry when I removed it.
Yes, all 8 removed to remove the cap, along with the coil and battery connector plugs.
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The Jalopy Journal
