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#379927 - April 22nd 2010 7:10 am Re: Chrysler 318 LA-Block - Stock Ignition Timing [Re: Alikazam]
NateNCBV Offline

Administrator

Registered: August 23rd 2005 12:00 pm
Posts: 20415
Loc: Brooklyn Park, Maryland, USA
I generally use a vacuum gauge to set timing. Sometimes it's a PITA to see the timing marks on an early.
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Nate Breece (Nate the skate)
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1994 Dodge B250 Elk Conversion (5.2L/A518)
1985 Dodge B150 "Burnin' Desire" (5.2L/A727)

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#379975 - April 22nd 2010 11:00 am Re: Chrysler 318 LA-Block - Stock Ignition Timing [Re: Alikazam]
Reed Offline
carpal tunnel

Registered: August 27th 2001 12:00 pm
Posts: 8372
Loc: Fircrest, WA
32-36 total timing does not include vacuum advance, which is very important for fuel economy and performance on a street motor.

Setting timing by vacuum isn't the best way to do it. You need to know (a) how many degrees of advance the governor in your distributor provides, (b) how many degrees of advance your vacuum advance pod provides (and when it provides it), and (c) what your target total degrees of mechanical and total timing is. For example, setting your base timing at 16 degrees BTDC with a distributor that has a governor that allows 30 degrees of advance will give you a total of 46 degrees mechanical timing advance. Add to that a vacuum advance pod that gives another 20 degrees of vacuum advance and you have a distributor that will provide 66 degrees of timing advance- way too much.

When using a stock distributor, use stock timing specs. If you have a remanufactured or other unknown distributor you really need to take it apart and determine what, exactly, you have, and what you ned to do to get the timing curve optimized for your vehicle.
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#379990 - April 22nd 2010 12:10 pm Re: Chrysler 318 LA-Block - Stock Ignition Timing [Re: Reed]
Alikazam Offline
old hand

Registered: September 14th 2009 8:07 pm
Posts: 852
Loc: Oregon, USA
As reed said, knowing what you have is important. I run an MSD Billet mechanical advance only distributor, running adjustable timing on it that you can dial your total mechanical advance amount anywhere from 24 degrees to locked out (0 degrees). So I run an 18 degree bushing in mine, fyi.

Know what you have and/or recurve your own distributor if you want to, it can be done on a stock one, it is just a bit more involved including welding up slots, etc. It depends on how far you really want to go. Good luck!
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1972 Dodge Van "Tigerlilly" - Blazing Copper/Sandstone Metallic - 3850 lbs empty
13.47 @ 97.53 mph N/A - 11.94 @ 113.33 mph N2O - old 360/727 + Nitrous (N2O)combo
Viper V10 + 4L80E conversion in progress...

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12.258 @ 113 mph - best so far & 23+ mpg on the freeway


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#379995 - April 22nd 2010 12:34 pm Re: Chrysler 318 LA-Block - Stock Ignition Timing [Re: Alikazam]
HomeBrew Offline
veteran

Registered: March 19th 2007 2:44 pm
Posts: 2081
Loc: Ohio, USA
Thats good info thanks guys. I was confusing myself.

I'm running a brand spanking new MSD digital E-Curve PN: 8504 its a trip man! I'm going to go home tonight and play with it some more.
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#380009 - April 22nd 2010 1:21 pm Re: Chrysler 318 LA-Block - Stock Ignition Timing [Re: HomeBrew]
M_S Offline
old hand

Registered: June 12th 2009 2:07 pm
Posts: 1170
Loc: CA
The E-curves are weird since you have to figure out your total advance and program that in with the curve with the pots. I have one for the '32, due to the tight confines and no vacuum canister.

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#380031 - April 22nd 2010 2:25 pm Re: Chrysler 318 LA-Block - Stock Ignition Timing [Re: M_S]
Reed Offline
carpal tunnel

Registered: August 27th 2001 12:00 pm
Posts: 8372
Loc: Fircrest, WA
I've never messed with that fancy-schmancy expensive MSD stuff. You can do just fine with a good old stock Mopar distributor and parts. Once upon a time I found the formula to convert distributor governor slot length to degrees of advance. I need to find it again...
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#380091 - April 22nd 2010 4:56 pm Re: Chrysler 318 LA-Block - Stock Ignition Timing [Re: Reed]
HomeBrew Offline
veteran

Registered: March 19th 2007 2:44 pm
Posts: 2081
Loc: Ohio, USA
oh dude, it is weird. Fancy shmancy over complicated backwards working gizmo. I've had moments of frustration and considered putting a stock like one in. I'm not giving up yet - Just gotta figure out how to work it right ;-) I spent some more tiem on the phoen with the msd techs.... I think I got my head wrapped around it. Now my problem (like nate pointed out) is the timing marks, or lack there of.... Hopefully it will go Vroom and not Boom.
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#380097 - April 22nd 2010 5:08 pm Re: Chrysler 318 LA-Block - Stock Ignition Timing [Re: HomeBrew]
M_S Offline
old hand

Registered: June 12th 2009 2:07 pm
Posts: 1170
Loc: CA
It basically works in reverse. You time it for max advance and the electronics zero it and feed in timing based on vacuum and rpm.

It threw me for a loop when I first read the instructions, but I guess it's logical in an entirely electronic distributor. The best part is the vacuum port location and small cap. Great for tight spaces.

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#380203 - April 23rd 2010 4:00 am Re: Chrysler 318 LA-Block - Stock Ignition Timing [Re: M_S]
Alikazam Offline
old hand

Registered: September 14th 2009 8:07 pm
Posts: 852
Loc: Oregon, USA
Some timing degree tape for the balancer would be helpful (7.25" diameter). I usually use some skim, very thin coat of RTV to adhere it to the balancer as it holds better than just the adhesive that comes with the tape, fyi. Good luck smile
_________________________
1972 Dodge Van "Tigerlilly" - Blazing Copper/Sandstone Metallic - 3850 lbs empty
13.47 @ 97.53 mph N/A - 11.94 @ 113.33 mph N2O - old 360/727 + Nitrous (N2O)combo
Viper V10 + 4L80E conversion in progress...

2009 Dodge Challenger SRT8 "Leelu" - TorRed - 6.1L Hemi/6 speed - Vortech V3 8psi - 500+ whp - 4250 lbs empty
12.258 @ 113 mph - best so far & 23+ mpg on the freeway


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#380238 - April 23rd 2010 12:16 pm Re: Chrysler 318 LA-Block - Stock Ignition Timing [Re: Alikazam]
HomeBrew Offline
veteran

Registered: March 19th 2007 2:44 pm
Posts: 2081
Loc: Ohio, USA
Yeah that tape didnt hang stay on long. Long enough to set it. (good thing I picked up two of them) Mine was only 5.25 in diameter....

Its Jammin now! shift


Edited by HomeBrew (April 23rd 2010 12:18 pm)
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