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

[Kelly Hardie <ramblinguy.kelly@xxxxxxxxx>]

Check out this article on Wiki 
:http://en.wikipedia.org/wiki/V6#Odd_and_even_firing

You can see how he's charted it there, three of the cylinders would fire 
at the correct time, the other three 15 degrees early. It's not the 
gearing, it's the shape of the cam (or reluctor if EI). A normal six has 
a distributor cam that looks like a normal hexagon, the uneven motor has 
one that has three short sides and three long sides. Given Delco 
interchangeability, it may be possible to swap in reluctor or cam from 
an even firing engine, then the distributor could be used for, I forget, 
what were we talking about?

Kelly

farna@xxxxxxx wrote:
> 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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>
>
>   


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