MSD experts? Ignition timing curve set up? - Chevelle Tech
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post #1 of 12 (permalink) Old Apr 25th, 12, 1:06 PM Thread Starter
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Peter
 
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MSD experts? Ignition timing curve set up?

Hi All,

I am preparing to install my new 8361 MSD distributor into my 1966 Malibu, and I need help in setting up the distributor for optimal timing curve.

Unfortunately I do not know the intimate details of the engines internals, but what I do know is this:

The engine is a rebuilt "1970" 350 V8
Engine has a "mild" cam (I do not have the particulars on exactly which cam)

Over the last year, I installed a new Edelbrock Performer Air Gap intake,

a new Edelbrock 650 cfm carb with quality K&N air filtration.

I removed the crap headers and installed OEM exhaust manifolds (HUGE improvement!).

The car came with a "ready to run" MSD distributor, which I am now replacing with the 8361.
I have already installed the MSD Digital ignition box.

I also installed a new "built" 700R4 tranny. The rear end is a "peg leg" with 308 gears. At highway cruise at 70 mph the engine is taching a hair under 2000 rpm.

The car is my daily driver and is used pretty exclusively on the street. So what I am looking for is an optimal advance curve set up for best fuel economy, and performance when I do stab the pedal ;^)

I will be making use of the vacuum advance, thus my choice of the 8361.

Many thanks in advance for any and all help!
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post #2 of 12 (permalink) Old Apr 25th, 12, 1:10 PM
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Jake
 
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Re: MSD experts? Ignition timing curve set up?

You'll want a quick timing curve. Mechanical advance should start coming in around 1200 and be "all in" by 2400 or 2600 (max), because of the high gears/overdrive you're running. Your mild cam may like 14 or 16 degrees of initial advance, and around 20 degrees mechanical on top of it. Your total would be around 36 or so, and a lot of 350's like somewhere around 50 or 52 including vacuum advance.

How did the manifolds improve your combination? I'm curious.

1972 Malibu Sport Coupe - Victory Red on Black - 350/TH350

I do all my own stunts.
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post #3 of 12 (permalink) Old Apr 25th, 12, 4:26 PM Thread Starter
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Peter
 
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Re: MSD experts? Ignition timing curve set up?

Quote:
Originally Posted by Highway Star View Post
You'll want a quick timing curve. Mechanical advance should start coming in around 1200 and be "all in" by 2400 or 2600 (max), because of the high gears/overdrive you're running. Your mild cam may like 14 or 16 degrees of initial advance, and around 20 degrees mechanical on top of it. Your total would be around 36 or so, and a lot of 350's like somewhere around 50 or 52 including vacuum advance.

How did the manifolds improve your combination? I'm curious.
Thank you for the response!

Because of the fitment of the headers, I experiences all sorts of heat related issues. Melted wire boots, baked plugs, etc etc. I was forced to use "shorty" plugs, and even with heat wrapping around the wires, boots etc, the plugs were still badly baked, and the engine NEVER ran well. Difficultly starting after running for a while, misfiring, etc etc.

When I replaced the headers with OEM manifolds, it eliminated the heat issues, and I am now able to use regular size plugs.

The car runs much, much better now, not to mention, it is much less noisy :^)

So if I am understanding your recommendations, and going off the information in the MSD installation manual, I should use the two Silver (light) springs, along with the Blue stop bushing (@ 21 degrees)?

Is this correct?
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post #4 of 12 (permalink) Old Apr 25th, 12, 6:26 PM
Ben
 
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Re: MSD experts? Ignition timing curve set up?

I' am having good luck with that particular spring/bushing combo. The box makes it pretty easy to choose though if there is something more you are looking for in regards to your timing.
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post #5 of 12 (permalink) Old Apr 25th, 12, 6:40 PM
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Jake
 
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Re: MSD experts? Ignition timing curve set up?

Would be nice to see a little vendor support here.

1972 Malibu Sport Coupe - Victory Red on Black - 350/TH350

I do all my own stunts.
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post #6 of 12 (permalink) Old Apr 25th, 12, 8:05 PM Thread Starter
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Peter
 
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Re: MSD experts? Ignition timing curve set up?

Quote:
Originally Posted by Highway Star View Post
Would be nice to see a little vendor support here.
Yes please!
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post #7 of 12 (permalink) Old Apr 26th, 12, 11:33 AM Thread Starter
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Peter
 
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Re: MSD experts? Ignition timing curve set up?

Quote:
Originally Posted by chevellercr View Post
I' am having good luck with that particular spring/bushing combo. The box makes it pretty easy to choose though if there is something more you are looking for in regards to your timing.
Thank you for the response!
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post #8 of 12 (permalink) Old Apr 26th, 12, 11:34 AM Thread Starter
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Peter
 
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Re: MSD experts? Ignition timing curve set up?

Anyone from MSD lurking around here?
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post #9 of 12 (permalink) Old Apr 27th, 12, 10:33 AM Thread Starter
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Peter
 
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Re: MSD experts? Ignition timing curve set up?

Hmm, looking at the post list, it doesn't appear there has ever been a post from someone who represents MSD.
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post #10 of 12 (permalink) Old Nov 29th, 12, 5:23 AM
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Re: MSD experts? Ignition timing curve set up?

Quote:
Originally Posted by peterlufrano View Post
Hmm, looking at the post list, it doesn't appear there has ever been a post from someone who represents MSD.
http://www.msdignition.com/forum/forumdisplay.php?f=8

Did you SEARCH BEFORE POSTING a new thread?
Did you post in the CORRECT FORUM?
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post #11 of 12 (permalink) Old Mar 21st, 14, 7:41 PM
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tony
 
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Re: MSD experts? Ignition timing curve set up?

That digital 6 box is junk, went through two of them one was repaired under warranty and failed 5 minutes later 3 tries. installed a 7al2 box and never looked back..

The crane high 6 will be my next choice when the time comes, few large engine builders have switched to the crane boxes..
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post #12 of 12 (permalink) Old Apr 27th, 15, 10:12 PM
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Re: MSD experts? Ignition timing curve set up?

Almost all MSD box failures are not from box issues, they are caused by junker 'Blaster' coils that are at varying levels of failure due to windings 'layer shorting' inside them.
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