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Problems with 340 timing
#2099716
06/28/16 12:43 AM
06/28/16 12:43 AM
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Joined: Nov 2004
Posts: 168 North Texas
TheTieWrapKid
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OP
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Joined: Nov 2004
Posts: 168
North Texas
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My long term project 72 340 Duster is acting strange. When I try to get it to idle and punch and sound normal, it isn't responding normally to minor tuning - idles mixture, turning the distributor for timing changes, trying different vacuum advance ports. I decided to get out the Innova digital advance timing light that I bought but haven't used til now. I had a lot of initial timing dialed in - 33 degrees . I had the vacuum advance disconnected and the port plugged at the carb. When I rev the engine up to 3000 - 3500 the timing mark goes the wrong way ( retards 20 degrees or so) and returns to the initial timing spot even though the engine is still revved up. I'm new to the advance light and don't know what's up with the Duster readings. It has Mopar Performance electronics conversion distributor, a chrome box, a pertronix coil. I tried it on another project - 71 Challenger 440 engine msd 6 box, proform ? procomp? something like that for a distributor, Mallory street strip coil - the engine runs pretty good and the timing acts like I expect. It advances some and holds when I rev it up. So I don't think it is a timing light problem. I hooked it up the same. What's wrong with the Duster 340 ? Distributor all messed up? Just not getting a good reading?
Last edited by TheTieWrapKid; 06/28/16 09:56 PM.
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Re: Problems with 340 timing
[Re: TheTieWrapKid]
#2099761
06/28/16 01:59 AM
06/28/16 01:59 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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with a 1&1/4" socket/breaker bar set the dampener on 15 BTDC. turn housing slightly till magnet is dead even with the closest tooth which will have the rotor under either the #1 or the #6 plug wire (holler if it is way off). cap the vac can port at the carb. have the dialback knob back to zero. start/idle it & see what you get for initial. this'll get us started & also note the RPM it is idling at. holler back
Last edited by RapidRobert; 06/28/16 01:11 PM. Reason: total brain fart, corrected now
live every 24 hour block of time like it's your last day on earth
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Re: Problems with 340 timing
[Re: RapidRobert]
#2100214
06/28/16 10:06 PM
06/28/16 10:06 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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the symptoms ain't making sense so I figured we might go back to some basics to try & get a handle on this. 15 BTDC is a good/reasonable start. You've likely already double checked your connections. I could see the MSD wreaking havoc on the dialback but if I am reading this right it is the other way around. Dont get a smart car, we WILL solve this! I see one every day in a companys' parking lot when I am out jogging & it caught my eye cuz it is so tiny (VG mileage I would assume). Do you have or can borrow a non dialback light for a quick repeat test?
live every 24 hour block of time like it's your last day on earth
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Re: Problems with 340 timing
[Re: TheTieWrapKid]
#2100354
06/29/16 01:08 AM
06/29/16 01:08 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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with a bit of thought someone had a similar problem & the plug wire clamped was evidently too close to another one & the magnetism from the spark in the nearby wire was jumping over to the clamped wire giving a false flash location on the dampener. EDIT #3 is gonna fire 270 deg later around the dampener than the #1 will (& that is assuming it is a clean jump)
Last edited by RapidRobert; 06/29/16 01:22 AM.
live every 24 hour block of time like it's your last day on earth
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Re: Problems with 340 timing
[Re: TheTieWrapKid]
#2101518
07/01/16 01:10 AM
07/01/16 01:10 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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Circle Track
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Lincoln Nebraska
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the early 241/260/270 Hemis have a dist with the same lower shaft length (3&7/8) as a SB & I am just assuming they rotate clockwise which I would think could cause this if one of those dists is in there but the eng could barely run & if it did it'd be way hot from the retarded timing exposing more of the cyl wall length to combustion. we're missing something simple here. confirm the spark ain't jumping over (move the clamp closer to the plug so the plug wire is isolated). SB adv weights look like a comma at the beginning of a sentence & BB's at the end of a sentence. the only way they will interchange is if you slip em on the post upside down & the pins the the slotted plate slides on would then be upside down so it would not work. Pics please! EDIT meant to say CCW on the rotation
Last edited by RapidRobert; 07/01/16 11:29 AM.
live every 24 hour block of time like it's your last day on earth
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Re: Problems with 340 timing
[Re: TheTieWrapKid]
#2101948
07/01/16 03:55 PM
07/01/16 03:55 PM
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Joined: Nov 2011
Posts: 2,154 Its a TRAP!
DARTH V8Я
Oh No!! I just had a moron attack!
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Oh No!! I just had a moron attack!
Joined: Nov 2011
Posts: 2,154
Its a TRAP!
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Huh? How'd ya bolt it down and NOT notice the gap? Lol.
When it takes more than a sweet mullet to prove you rule at the trailer park..
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Re: Problems with 340 timing
[Re: TheTieWrapKid]
#2102128
07/01/16 09:41 PM
07/01/16 09:41 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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Lincoln Nebraska
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close your fist & set it on top of the vac can. open your fist & let your fingers curl around the dist housing/cap the way they would naturally cup it. this is your direction of rotation. let us know what you get & if you pull the dist you can turn the housing in your hand just right till you can see enough of the weights to see if they are CW or CCW rotation. plus measure the dist shaft (Darthvdr is wondering)
live every 24 hour block of time like it's your last day on earth
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Re: Problems with 340 timing
[Re: TheTieWrapKid]
#2102148
07/01/16 10:09 PM
07/01/16 10:09 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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Lincoln Nebraska
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whichever fist (L or R) that when sitting on top of the can will let your fingers open naturally & cup around the cap (it'd be the opposite of where the can nipple that the hose pushes on to is pointing). if your fingers are reaching around clockwise then CW rotation
live every 24 hour block of time like it's your last day on earth
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Re: Problems with 340 timing
[Re: TheTieWrapKid]
#2102466
07/02/16 12:56 PM
07/02/16 12:56 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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Lincoln Nebraska
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alright, how about we move the clamp closer to the plug and grab one of you regular lights
live every 24 hour block of time like it's your last day on earth
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Re: Problems with 340 timing
[Re: TheTieWrapKid]
#2115863
07/22/16 11:03 PM
07/22/16 11:03 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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Circle Track
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Posts: 36,041
Lincoln Nebraska
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I have two cars now that run better with the coil wires reversed from what the Mopar conversion kit schematic calls for! is the black/yellow wire going to coil neg primary?
live every 24 hour block of time like it's your last day on earth
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