Just to follow up on the thread. I found the problem with start-up after the engine mods on my '71 350 Malibu.
I mis-wired #6 and #8 (switched). Runs great now. For those interested in what I experienced in tuning the Edelbrock 1405 carb, read-on. The setup in the car is now: Edelbrock 2701 intake Edelbrock 1405 carb Non-stock cam, but doesn't appear too radical Sanderson headers Flowmaster exhaust, 50 series mufflers I installed an O2 sensor to help with tuning, read with a voltmeter. I'm using the "timed" advanced port, on the left as you face the front of the carb. Out of the box, the O2 sensor read rich (>900mv) during both cruise and power operation. I recalibrated two stages leaner in power, and two stanges leaner in cruise. The O2 sensor still read rich during power (>800 mv), but cruise read lean (<.100 mv). At first I thought the O2 sensor was reading wrong, but there was some hesitation at certain speeds, so I figured it must be lean. I then went 1 stage richer in cruise. The O2 sensor read between 600mv and 900mv; still a little rich, but not bad. The power operation was still rich, but with the 1479 calibration kit, I can't lean it out any more. But the car runs great; no hesitation anywhere, so I'm leaving it there for now. I'm hoping an ignition upgrade will lean it out a little more. Conclusions: The O2 sensor was a big help in dialing in the carb quickly. Getting an ideal A/F mixture of 14.7 (~500 mv) is very hard; it lies between two stages in the Edelbrock calibration in my setup. The Flowmasters sound nice; quiet when you are off the gas, and not too loud when you tromp on it. My only complaint is that there is a resonance at 3000 RPM that is too loud for me, especially since that's the RPM thats around 55mph. But it great to have it back on the road after a long winter. Tom Tomlinson -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Bill Vander Werf Sent: Wednesday, June 04, 2003 9:43 PM To: [EMAIL PROTECTED] Subject: RE: [Chevelle-List] Rich Edelbrock Carb Tom, I would separate 5 and 7 by running the #3 wire between them and then angle the ends away from each other at slight angles to separate them at the distributor cap. I'm afraid it's not as pretty a setup but if crossfire is a problem it will solve it. As far as the distributor being a tooth off; I'm a weirdo about that kind of stuff and would fix it. However, if you can set the timing where it needs to be the way it is it isn't necessary to change it. Bill Vander Werf -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Tom Tomlinson Sent: Wednesday, June 04, 2003 7:30 PM To: [EMAIL PROTECTED] Subject: RE: [Chevelle-List] Rich Edelbrock Carb Wow, learn something new everyday. Now that I've read up on this cross-fire problem, it could very well be my problem. I'll look into the cap as well as separate the wires better. Also, did anyone who looked at the close-up picture of my engine wiring see anything funny about the distributor? After I cut the wires, I noticed that my vacuum advance horn was pointing toward the front of the car, not the #4 cylinder like most small blocks. The previous owner put the distributor in one cylinder off. It runs ok, but the vacuum advance horn is shoved up against one of the manifold runners, making it a tight fit. The more I go through this car, the more "odd things" I find about the engine set up. Of course if I try to set the distributor to the usual location, some of the plug wires will be a little off. Oh well, live and learn. Tom > > > > Bill: > > The car is not nearby, but the pictures I took of the engine show that #5 > > and #7 are close to each other in the wire loom, then cross near the cap. > > How far apart should they be? Would the spacing of a typical wire loom be > > enough, or should there be at least a wire in between? > > > > If you want to see a picture of the set up you can go to: > > > > http://www.eagleshore.com/bear/engine-left-close.jpg > > > > Tom ----------------------------------------------------- To Unsubscribe please visit www.chevelles.net/list.html To start a new topic, send mail to: [EMAIL PROTECTED] ----------------------------------------------------- To Unsubscribe please visit www.chevelles.net/list.html To start a new topic, send mail to: [EMAIL PROTECTED]
