Re: [Amc-list] EFI install on [anything modest]

[farna@xxxxxxx]

Date: Wed, 04 Apr 2007 22:24:15 -0400
From: Matt Haas <mhaas@xxxxxxx>
Subject: Re: [Amc-list] EFI install on [anything modest]
To: "AMC/Rambler owners, drivers and fans." <amc-list@xxxxxxxxxxxx>
Message-ID: <46145DCF.9020605@xxxxxxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Swygert, Francis G MSgt 436 CES/CECM wrote:
> Date: Tuesday, April 3, 2007 08:58 PM
Okay, I understand the placement of the rotor under the plug tower. But isn't that a function of the gearing on the cam and distributor? I can't think of anything inside the distributor that will change the position of the rotor. Since anyone converting would be using an AMC (Chevy inline six) distributor with the electronics of the V-6 distributor, I don't see how there's a difference. It could be in the ignition module, I suppose, but there's only a slight amount of room to change timing there. Still, it could be enough to warrant getting an in-line six module.

----------------

> From: Matt Haas <mhaas@xxxxxxx>
> 
> Swygert, Francis G MSgt 436 CES/CECM wrote:
> <snip>
>> but that's easy to fix -- no bulb! It's even better to use a GM HEI
>> distributor though. I believe it's a simple mod to the older
> stand-alone
>> type to computer controlled timing. Simply take the parts from a V-6
>> distro. I'm not sure that's the greatest idea because of the timing
> <snip>
> 
> If you go this route, be aware that GM used odd, semi-even, and even
> fire V-6's. You need an even fire V6 distributor for an AMC 6. It would
> also be worth checking to see how late Chevy made their inline 6. I
> suspect it was late enough to get a computer controlled distributor.
> ---------------
> 
> Hmmm... good point... I think. I don't think the odd/even fire makes a
> difference. You'd just wire the plugs in the AMC firing order starting
> with #1 at TDC. I could be wrong, could be different timing on odd/even
> fire V-6s. 

It makes a big difference. The even fire engine fire a plug every 120 
degrees of crank rotation just like an inline six. The semi-even fire 
engines fire the cylinders in 132 and 108 degree pairs. The odd fire 
engines are in 150 and 90 degree pairs. I also read a note that the odd 
fire engines are race only parts for Chevy (I think that other GM 
divisions may have made odd fire V6's but I'm not 100% sure on that). 
Using anything than a true even fire distributor will put the vanes in 
the distributor in the wrong physical place to fire the plugs when you 
need them.

--
Frank Swygert
Publisher, "American Motors Cars" 
Magazine (AMC)
For all AMC enthusiasts
http://farna.home.att.net/AMC.html
(free download available!)
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