The Ranger Chronicles...Running much better

**Dan B.** · 08-16-2011, 11:06 PM

OK........got the WAY lean condition corrected. Found out that I missed tightening one thing that made a huge difference. I had the nitrous plate under the carb for mock up and the lines on but not tight. So it was sucking air in under the carb. I don't even have the bottle in but just checking for hood clearance.

Once that was remedied it was breaking up lean at cruise speed. The idle was set perfect at 15:1 but to achieve that the idle screws (it only has two) were out 3/4 turn each. At the urging of a friend I turned them out 1.5 turns. This made it go way fatat idle (10.5:1) but the cruising lean condition got much better.

So make that all better my plan is to bump up the primaries like we talked about before and lean the idle screws back out.

But now there another issue. When lightly tipping into the throttle at about 2600-2700 rpm it starts breaking up and the wideband shows lean. Tip in a hair more and it smooths back out. I can recreate it at will to make it sputter then smooth out. Not sure what this may be but my buddy suggested timing. My initial is set at 14 and total is 35. Ignition parts are all MSD. He suggested backing the timing down a little and see what happens.

And just for giggles I'm going to swap on a different Holley 750 that is all stock and see how the AFR does for driving around.

Until next time.......

**Mark Aubele** · 08-17-2011, 12:10 PM

What cylinder heads, and octane are you running?

**Dan B.** · 08-17-2011, 12:13 PM

World Products Windosr Jr. 2.02/1.60. Fuel is high test from local station, 93 octane.

**Mark Aubele** · 08-17-2011, 12:45 PM

OK, I would say the total timing is about right from what I remember reading in the rags back when those heads were pretty popular. I really think you need to get the idle around 14.5-16.0 and just do jet changes before messing around with those idle screws too much. I wouldn't obsess over getting the idle TOO lean before doing some jet changes. Remember that carb was jetted for a little low compression 302 before you got it. It always ran goofy below 2500 or so, but I always attributed that to the 250ish*@.050 duration and 8.5 to 1 compression.