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Author Topic: ignition timing 318 2 bbl  (Read 1047 times)

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Offline mecanovi

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ignition timing 318 2 bbl
« on: May 10, 2011, 01:21:39 PM »
hello,

How much you change your ignition timing on a 81 318 2bbl of Ramcharger?

my Ramcharger is a heavy duty 318 2bbl (canadian)

the review indicated that 2 ATDC
Set idle speed 750 RPM
enriched idle speed RPM


if I take the same engine in light duty (federal)
16 BTDC
650
790

I find the huge difference

thank you very much

Offline DODGEBOYS

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Re: ignition timing 318 2 bbl
« Reply #1 on: May 10, 2011, 02:01:52 PM »
it has mainly to do with the DIST centrifical and vacuum advance
put your truck info HERE
MOPAR TO YA! AARON HOWORD TOWNSEND / SLANTEDMIND---GOD BLESSDODGEBOYS FSM STORE
ramchargercentral@hotmail.com
DO NOT use the site IM,s to contact me  l have them turned OFF

Offline ToxicDoc

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Re: ignition timing 318 2 bbl
« Reply #2 on: May 10, 2011, 02:05:31 PM »
Much of it has to do with emissions.  Many of us set it around 12o BTDC for good mileage and performance.
'85 W150 SB, 408 stroker, Magnum manifolds, Performer RPM, 670 Truck Avenger, HEI ignition, Auburn LSD 9.25 and '82 D44 (non-CAD) with 3.55/3.54,  NV4500/NP241

Offline mecanovi

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Re: ignition timing 318 2 bbl
« Reply #3 on: May 10, 2011, 02:18:03 PM »
thank you


so I can put 12 BTDC without problem

why my Ramcharger for Haynes must have after the 2 ATDC?

Offline ToxicDoc

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Re: ignition timing 318 2 bbl
« Reply #4 on: May 10, 2011, 02:19:32 PM »
thank you


so I can put 12 BTDC without problem

why my Ramcharger for Haynes must have after the 2 ATDC?

I never trust the Haynes manual.  You don't know what they use for an information source.  I think you would be safe and happy around 10-12 without any problems.
'85 W150 SB, 408 stroker, Magnum manifolds, Performer RPM, 670 Truck Avenger, HEI ignition, Auburn LSD 9.25 and '82 D44 (non-CAD) with 3.55/3.54,  NV4500/NP241

Offline mecanovi

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Re: ignition timing 318 2 bbl
« Reply #5 on: May 10, 2011, 02:21:37 PM »
no haynes

a truck service manual


10/12 BTDC ?

Offline ToxicDoc

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Re: ignition timing 318 2 bbl
« Reply #6 on: May 10, 2011, 02:31:20 PM »
I can't say why there are so many differences.  It is a complicated issue as I mentioned before - emissions, economy, power, and temperature are all influenced by it. 

You could set the timing anywhere in a wide range and it will still run well, but the more advanced (BTDC) it gets, generally the more power and economy you will have.  Eventually if it gets too much, the engine will ping (detonation) and you will have problems.  I ran my '85 318 at 14o BTDC and it was fine, but you can do a little less to be safe.
'85 W150 SB, 408 stroker, Magnum manifolds, Performer RPM, 670 Truck Avenger, HEI ignition, Auburn LSD 9.25 and '82 D44 (non-CAD) with 3.55/3.54,  NV4500/NP241

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Re: ignition timing 318 2 bbl
« Reply #7 on: May 10, 2011, 02:40:21 PM »
buy yourself a FSM [factory service manual] and never be confused or miss informed again
put your truck info HERE
MOPAR TO YA! AARON HOWORD TOWNSEND / SLANTEDMIND---GOD BLESSDODGEBOYS FSM STORE
ramchargercentral@hotmail.com
DO NOT use the site IM,s to contact me  l have them turned OFF

Offline mecanovi

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Re: ignition timing 318 2 bbl
« Reply #8 on: May 10, 2011, 04:26:31 PM »
thanks

12 BTDC  lead going to pollute atmosphere , no ?

Offline ToxicDoc

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Re: ignition timing 318 2 bbl
« Reply #9 on: May 10, 2011, 06:24:50 PM »
thanks

12 BTDC  lead going to pollute atmosphere , no ?

maybe yes, maybe no.  If the temperature in the cylinder gets too hot, it will increase nitrous oxides (NOx).  Set it and don't worry about it.
'85 W150 SB, 408 stroker, Magnum manifolds, Performer RPM, 670 Truck Avenger, HEI ignition, Auburn LSD 9.25 and '82 D44 (non-CAD) with 3.55/3.54,  NV4500/NP241

Offline mecanovi

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Re: ignition timing 318 2 bbl
« Reply #10 on: May 11, 2011, 11:59:29 AM »
I controlled my ignition timing 11 BTDC


I understand how you can put 2 ATDC knowing that graduation starts at 0