Carl, i think on J and K the huge variable of the exhaust heat valve is gone . The idle cams never work at the same time on F or G which makes the chokes act separately. Unlike most dual quads it really is two 4 cylinder engines; if one side gets rich or lean it stalls . Once warm and running it’s ok . J and K fixed that by no heat valve (YES) and manual chokes forcing both sides to stay even , on the same idle step during warm up . Those who somehow think the factory 60-61 will consistently work perfectly by endless diddling are dreaming .I can say that after 50 years at this . — maybe in Texas with heat off, chokes set lean and minor gas pedal fiddling at start. They positively did not work well during warmup back in the day ,leading to setting high idle and slamming into gear (?even language about that in owners manual ! !) —why so many were pulled and why NONE in 62 . Enthusiasts put up with it, normal buyers , no . Rams in trunk were common , why you find a lot of rams loose today but no exhaust manifolds You can mimic J by fixed 1/4 aperture washers in F and G heat pipe flange , remove plate on heat valve or tie open with stainless wire so it does NOT stick shut ( stuck on full heat) as they all do sooner or later over a winter . I think electric chokes on that setup, with no , or fixed heat set up will work as well as J or K. The real issue is during the partial warm up period the chokes are not in sync on F and G and so flooding 1/2 of it is easy if you pump the gas . And for some reason flooded rams are hard to clear ,( plugs wet?) , it cranks without even a slight catch , you know you are in for fun. Ether spray , and it will start , so for sure gas mixture is off . I have been at club meets where real pros get into this . Has happened me . You are not sure if flooded , or ignition, or whatever . At home you can walk away , come back later it starts right up While time is an issue these days , I always wanted to try water heat, flex throttle cable to each carb (?like 67 dart has,or Lokar ) and AVS carb ( much better carb that afb or edelbrock) and use the electric choke the avs comes with . Cables would allow separate normal idle screw setup , using transition slot to keep idle mixture right across rpm during idle warm up . Stock F and G lock throttles solid with a rod , why they had that very special air valve carb to set idle air flow . However that valve stays at a fixed setting (!) unlike transition slot, no tracking on high idle . Wrong in a most basic way to have no transition slot action at all . Note anti stall spring opening fouls up idle mix , unlike a normal carb which would enter the transition slot . Sounds like poorly thought out band aid , as see next paragraph … Add to this , what to me is a huge factory design fault , ram runs manifold vacuum ignition advance ( not ported !!) . Must be only car in the world that way . So idle compensater plunger opens throttle, vacuum drops, spark retards ,slowing idle not sure where that got you . all this Gone by 63 as Carl said . You look in ram setup bulletin , after setting idle with advance disconnected it says “ there is no specification for spark at idle with vacuum connected “ ( wha?) Could not believe my eyes. Translation : full advance at idle, with manifold vacuum ? or? What happens as you step on gas hot ? retards just off idle then advances again on cruise ? This ignition aspect can lead to hunting , erratic idle rpm , more vacuum equals more advance equals more rpm , nothing to do with mixture screw you are messing with . Or a drop in vacuum lowers advance , means more rpm drop , means stall ,,as when entering drive AVS is ported as is Edelbrock All this can drive you crazy, the more you try to understand or look into it , the less you can comprehend what they were doing all in , all happening at once . . As John says, all thus may average out , you can get to B+ if you are good , Attempting an A + involves compromise somewhere else . And same engine often runs a bit differently in different cars , a few are terrific , some are slugs In closing , I saw with my own two eyes a long ram on a built 440 on a careful , optimized dyno run . It was 40 hp less at 5000 than a mopar performance single 4 bbl . AB swap But I love how they look …and yes nice wallop at 70 mph with the torque They can increase Jack or Jameson fueling too . Overstudy? Overthink ? maybe … Still love the look , love the J , more “ fully baked” On Feb 18, 2025, at 7:30 AM, John Nowosacki <jsnowosacki@xxxxxxxxx> wrote: -- For archives go to http://www.forwardlook.net/300-archive/search.htm#querylang --- You received this message because you are subscribed to the Google Groups "Chrysler 300 Club International" group. To unsubscribe from this group and stop receiving emails from it, send an email to chrysler-300-club-international+unsubscribe@xxxxxxxxxxxxxxxx. To view this discussion visit https://groups.google.com/d/msgid/chrysler-300-club-international/B448BE4F-52AA-40A8-A2A5-BC3236EA2CBC%40gradyresearch.com. |
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