the comment about timing is more important than it might seem . if it truly cranks ok cold , too much idle advance really shows up hot . Not sure why that is . But absolutely the truth . And not mentioned , the way to sort this is measure starter amp draw to crank . The loaded values are in fsm , but need special ammeter . I had a starter with partial short where main lead passes through frame to inside , drove me crazy . clue was wires from battery got warm , but slow crank hot was result .
But even more of issue that can lead to incorrect timing :
— many of us do not realize vacuum advance on rams is not ported like it should be (!) It is straight manifold vacuum . if you look at ram service bulletins carefully they say disconnect and plug ( yes,always do that — ported or not ) but then go on to say that’ There is no spec for idle timing with advance connected” ( what?) I think this is for sure a major design error , I chased this in carter carb book , — there is only one other car without ported vacuum in this period , it was dual quad red hot cam corvette , has no vacuum anyway at idle . I can see that .
But rams develop vacuum , and that is then a function of rpm idle . Raise idle ( we often do ) you can get advance . Interact as more advance increases idle rpm . Leads to unstable idle speeds .
So if you do not read book carefully and accidentally set up timing with line connected who knows what you have .One might even say who knows what you have anyway ? Related the advance canister for rams may be very special , not move (?) at idle , high threshold ? but then not move at moderate cruise too , equals terrible gas mileage ( we have seen that before) . Despite praise of wonderful engineering , the first long rams were half baked when taken out of the oven . erratic carb heat and this come to mind —as well as how much J changed . If great design— why totally dumped in 62 , back in 63 ? greatly changed . w manual choke?
No ported advance 60-61 ? why ? maybe because design of air valve screw AFB idle air would wreck critical calibration of a port slot just off idle ? Ported works only if throttle plate is open a little bit . Not on rams . It is closed . There is a reason ported advance was in every car made … to separate unneeded idle timing advance from light cruise , which is just off idle throttle opening where you need it .., for mileage .As port is uncovered on cruise , vacuum rises there , advances timing to save gas . Then disappears at more throttle opening for power , avoid detonation . But - if idle timing high during crank = fights starter . just sayin , not answerin jg On Jun 27, 2024, at 11:24 AM, Henry Schleimer <henry.schleimer@xxxxxxxxxxxxxxx> wrote:
For archives go to http://www.forwardlook.net/300-archive/search.htm#querylang
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