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86 318

  
Mopar Muscle
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86 318

 
joes_transam joes_transam
New User | Posts: 12 | Joined: 01/14
Posted: 01/22/14
04:36 PM

I put a 525 extreme comp cam in my 318 and the only way to get it to fire up was the cam and crank on 12 and 12 its at TDC compression stroke with both valves closed when its at 12 and 12 it with start right up and run but pops out the exhaust while its idling and pops through the carb if you give it a lot of gas is the distributor off a tooth or what any info will help me a lot thanks.  

IQ52 IQ52
Guru | Posts: 858 | Joined: 06/10
Posted: 01/22/14
05:49 PM

It would have been better if you had actually degreed the cam in but it is what it is now.

So, the first thing that comes to mind is the distributor timing. Probably not a tooth off but just retarded. A cam like that will want about 18-20 degrees initial at idle and another 12-14 mechanical advance. I'm guessing you don't know what it's timed at and what kind of mechanical advance you have in the distributor.  

joes_transam joes_transam
New User | Posts: 12 | Joined: 01/14
Posted: 01/22/14
07:38 PM

I'm not sure it has a stock distributor off a 88 ram charger 318 and I know that with the balancer at 0 on the timing cover the crank and cam are exactly on 12 and 12  

joes_transam joes_transam
New User | Posts: 12 | Joined: 01/14
Posted: 01/22/14
07:40 PM

There's on vac advanced or anything on the distributor  

joes_transam joes_transam
New User | Posts: 12 | Joined: 01/14
Posted: 01/22/14
07:41 PM

There's no vac advanced or anything on the distributor  

joes_transam joes_transam
New User | Posts: 12 | Joined: 01/14
Posted: 01/22/14
09:00 PM

I been looking up my timing and a lot of people are saying being my timing is 12 and 12 means my number 1 cylinder is TDC compression stroke and firing my number 6 cylinder so do I need to make my number 6 post on my distributor cap my number 1 and time it from there.  

wayne712222 wayne712222
User | Posts: 121 | Joined: 10/13
Posted: 01/23/14
05:16 PM

i have a few questions..


what did you do with the fuel injection that came on that truck???

it should have Throttle body fuel injection..

there were instructions on the emissions label on how to set the timing properly.. if it still exists..

please describe what you have changed...

and what exists on the truck currently..  

joes_transam joes_transam
New User | Posts: 12 | Joined: 01/14
Posted: 01/23/14
07:51 PM

yes sir it was TBI its a 86 318 I removed the TBI and intake put the 525 lift cam and lifter kit a double roller timing set a edlebrock torker 2 intake holley 670 advenger carb a distributor off a 88 318 I left the in tank fuel pump added a quick fuel return style fuel pressure regulator left all the computer stuff hooked up when I was lining up the timing marks on the cam and crank with the number 1 at TDC compression stroke the marks were both at 12 o clock.i put the timing cover on and the balancer was at 0 degrees I put it back together it starts just fine and idles but its popping out the exhaust and if you give it gas it backfires through the carb.  

wayne712222 wayne712222
User | Posts: 121 | Joined: 10/13
Posted: 01/23/14
09:06 PM

well.. i am taking that the 88 distributor has NO vacuum advance.  and it will probably have a round 3 wire connector.. thats a computer controlled ignition system and i am amazed that it works.

you seem to have several problems..

you are going to need to convert to some kind of non computerized distributor..

there are vacuum advance type mopar distributors..

there are self contained distributors from several manufacturers..


popping out the carb could be several issues other than timing..

it could be incorrect adjustment of the accelerator pump lever.. could need changes to the discharge nozzle sizing.. could need a different pump lever cam..  could have issues with the idle transition circuit..


how about some pictures from under the hood.. post them at one of the image hosting sites.. photobucket is free.. as are some others..  you can paste the links here..  

joes_transam joes_transam
New User | Posts: 12 | Joined: 01/14
Posted: 01/24/14
05:28 AM

yes sir it has no vacuum advanced its the round 3 wire connector I was told that it wasn't computer controlled all that was controlled by the computer was the throttle body to just unplug it and throw a 4 barrel intake and carb on it they also said that I should go with a 750 carb but I thought that was way to big for a stock 318.  

3404spdvaliant 3404spdvaliant
New User | Posts: 20 | Joined: 01/14
Posted: 01/27/14
12:04 PM

when the cam and crank are at what you consider tdc, they point 12 and 6, but really....the firing is at no 6 cyl, not no. 1.

so when you have the cam pointing 12 and the crank pointing 12, thats no.1 firing on the rotor and is correct.

now, set the timing correctly , start at 12* @800rpm and or a total/full adv of 30-34* at 3k rpm and see what it does.

see you once you stab the cam dot to dot, wherever it is actually degreed at, you still have to tune it.  

joes_transam joes_transam
New User | Posts: 12 | Joined: 01/14
Posted: 01/27/14
05:58 PM

so now when its idling I need to get to idle at 12 degrees on the timing light at 800 rpm  

marcohotrod340 marcohotrod340
Enthusiast | Posts: 466 | Joined: 09/08
Posted: 01/28/14
10:28 AM

yes, at idle around 800 rpm u want 10-15 degrees advance, with no vacuum advance.   now the big check-the advance needs to increase as the revs increase-u want around  33-35 degrees advance total. most computer controlled distribs have no mechanical advance mechanism inside-I think this is your main problem  

joes_transam joes_transam
New User | Posts: 12 | Joined: 01/14
Posted: 01/28/14
05:54 PM

ok i'll try that and my distributor don't have a vac advance I know that and I know when its TDC the rotor points straight towards the carb is that right or should it point towards the number 1 cylinder cause im thinkin its a tooth to far and needs to be a tooth back and I thank ya'll for your help so far.  

marcohotrod340 marcohotrod340
Enthusiast | Posts: 466 | Joined: 09/08
Posted: 01/29/14
01:07 PM

the rotor must point to where the #1 plug wire plugs into the cap, not the #1 cylinder. if a timing light shows from 5* advance to 35* advance she is not "off a tooth" . your distrib have any advance mechanism? a 670 carb is plenty, maybe the holley has a blown powervalve-will run rich  

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