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

[Matt Haas <mhaas@xxxxxxx>]

Swygert, Francis G MSgt 436 CES/CECM wrote:
> Date: Tuesday, April 3, 2007 08:58 PM
> 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.

Matt
-- 
mhaas@xxxxxxx
Cincinnati, OH
http://www.mattsoldcars.com
1967 Rambler American wagon
1968 Rambler American sedan
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