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I'm RICH!!!!!! |
jtf914 |
Sep 30 2003, 09:51 AM
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#1
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Member Group: Members Posts: 428 Joined: 31-December 02 From: Burlington, CT Member No.: 58 Region Association: North East States |
Alright I lied, I’m not rich, but my 2.0 E spec 6 is doing pretty well for itself. I’m running out of ideas, and I’ve wasted a lot of time/money trying to figure this out (IMG:style_emoticons/default/headbang.gif) , and I'd rather be driving.
The car runs great, pulls strong, the idle is solid, and no popping once it is warmed up, but I have to run the mixture screws out around 4 – 4 ½ turns to keep the engine running consistent. I’ve used PMO’s tuning instructions as well as Wayne’s, and every variation I have heard from others. Here’s the engine specs: Original 914-6 engine rebuilt to E specs Mechanical Advance Bosch Dist Crane xr700 optical ignition New coil, wires, NGK BP5ES plugs Webers – 55 idles, 120 mains, 30mm venturies, 170 air correction, F1 emulsion tubes The webers have been cleaned/rebuilt many times, pump volumes set at .6cc’s, float level set with the proper tool while the engine was idling. Carbs balanced at 1200/3000. Fuel regulator/guage showing constant 3.5lbs of pressure. I’ve tried 60 idles, but didn’t really help, and PMO said there was no reason I shouldn’t be able to run 55’s, and said my jetting was adequate for a 2.0E. Valves adjusted, and the timing is set at 35 deg full advance at 6000rpm. The problem when I lean it out: The engine will idle when the mixture screws are 2 ½ turns out, but I get lean pop out the intakes, and once I rev the engine, it will not return to idle, it will just hang around 1800 – 2000. Once I get around 3 – 3 ½ turns and hit the throttle it will slowly return to idle, and at 4 – 4 ½ turns the throttle response becomes crisp. What do I try next??? Has anyone else ever had this problem?? Thanks, Justin (IMG:style_emoticons/default/beerchug.gif) |
ArtechnikA |
Sep 30 2003, 10:33 AM
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#2
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rich herzog Group: Members Posts: 7,390 Joined: 4-April 03 From: Salted Roads, PA Member No.: 513 Region Association: None |
QUOTE(Justin Fischer @ Sep 30 2003, 07:51 AM) New coil, wires, NGK BP5ES plugs Webers – 55 idles, 120 mains, 30mm venturies, 170 air correction, F1 emulsion tubes those are pretty hot plugs for 'E' compression. 170 looks a bit small for air correction, but that -shouldn't- be a big factor at idle ... venturiis sound big but i really don't remember what's in mine (stock pistons, E cams...). are you SURE you don't have a vacuum leak? air coming in from sloppy throttle shafts or warped mounts could be a culprit... if you don't have the '906' extended secondary venturiis, i recommend them, especially with those cams ... beyond that i donno ... |
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