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posted by
someone claiming to be Dan Carey
on
Thu Dec 6 08:04 CST 2001 [ RELATED]
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Mario, sounds like your carburation is a hair lean to me. Are the throttle shafts tight, or do they wobble? HS-6 carburators are famous for that and it causes a lean condition that makes getting a reliable idle a challenge. Try backint the jets out a 1/4 turn or so and see if it helps or hurts the stalling.
Just how are you using a tach to set your timing? I'm not busting your chops, I just want to know. I'd be the first to agree that the timing marks on a thirty year old car are mostly cosmetic. You can't rely on them to actually set the timing to "factory" specs. This is because of at least two things: First, the factory timing was determined using gasoline that doesn't exist today. The 87 octane swill you get at the pump nowadays has significantly different burn characteristics than the stuff you got for $0.25/gallon back in '67. Second, wear and tear on the engine means that it the timing marks lie to you. I've torn down engines that had so much slop in the timing gears that the timing marks were off by many degrees. But you can use the marks to reset the timing once you know the "correct" timing for your car.
I learned the finer points of tune ups from a Swede named, and I'm not making this up, Walter Larsson at European Auto in Long Beach, CA. As to timing, I've found that a B18/B20 runs pretty well when the timing is advanced to just before the engine starts to ping. I advance the timing until the engine starts to idle rough and back it off a few degrees. Then, I hop in and drive it. Tooling down the road at about 25mph in second gear, I switch to fourth and floor the gas pedal, lugging the engine. If I get a little pinging, that's probably Ok. If I get a lot of pinging, I back the timing off a few degrees and try it again. The idea is to get the engine just to the point where the timing has a healthy advance, but only pings if I use bad gas or really lug the engine.
As to carburation, I like to keep my car running a little rich, like 1-2 "flats" on the jet adjuster hex. Yeah, it costs me an mpg or two and the car smogs up the place a little bit more, but it runs well and burns cooler. With unleaded gas, your valve seats will last a lot longer if you run it a little rich. I'll lean it out a little if I'm going cross country to pick up that extra 10-20 miles per tank. The SUs are really easy carbs to keep in tune once you get a feel for them.
Well, good luck. If you want any free advice, which is guaranteed to be worth what you paid for it. e-mail me at danimal_57@yahoo.com and I'll get back to you.
Dan
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