HEI's exposed!

Tim · #1 07-01-2002, 02:32 PM

WARNING!

This series is not for the faint of heart or squeamish. Don't view with mixed company, (like those Bullnose types).

The first pic is okay for any audience as it is rated G, but pics 2-11 go to R then X right away.

Beware, you should be sitting down when viewing, (perhaps strapped down).

Tim · #2 07-01-2002, 02:52 PM

Okay, the purpose of this post is to exploit an odd-fire and even-fire HEI for Buick V-6's, (225, 231 & 252).

In the process you will be able to tell the difference between the two and verify that your HEI has all the correct parts and not a hodge-podge of the two.

Pic 1 - Caps on. Note the two dummy plug wire towers at 2:00 & 6:00 on the odd-fire cap. No dummies on the even-fire cap.

Tim · #3 07-01-2002, 03:10 PM

Pic 2 - Caps off. Looking straight down into the distributors. Note it is virtually impossible to tell if the distributor is odd or even at this angle. You need to see under the weights and shaft to tell. Looking at what's inside the caps you can tell the odd from even by the three different size tangs that the rotor contacts of the odd-fire while the even-fire cap's tangs are all the same size, (also even-fire tangs evenly spaced).

Tim · #4 07-01-2002, 03:15 PM

Pic 3 - Close-up of the odd-fire cap inside with three distinct sized tangs. Starting at 12:00, # 1 is long, #'s 2 & 3 are short, # 4 is long and #'s 5 & 6 are medium.

Tim · #5 07-01-2002, 03:18 PM

Pic 4 - Close-up of even-fire cap. All tangs same size, equally spaced.

Tim · #6 07-01-2002, 03:30 PM

Pic 5 - Shafts removed. Note pickup, (ring thingies with points), on odd-fire has six points spaced unevenly like three groups of two close together, (just like RRich's famous and world reknown painting in lead). Even-fire pickup has six evenly spaced points. Shafts are positioned upside-down to show differences in reluctors, (star thingies with points). Note three evenly spaced points on odd-fire shaft, while even-fire shaft has six evenly spaced points.

Tim · #7 07-01-2002, 03:36 PM

Pic 6 - Both odd and even-fire distributors take the same coil. Note the correct coil in the distributor cap compared to incorrect Chevy coil. Buick coil has red & white wires while Chevy has red & yellow. Buick also reverses polarity. The red & white wires are crossed, while the Chevy's red & yellow wires are not.

Tim · #8 07-01-2002, 03:40 PM

Pic 7 - Close-up of crossed wires on Buick coil reversing polarity. Sorry it's not in focus.

Tim · #9 07-01-2002, 03:43 PM

Pic 8 - Close-up of Chevy coils' red & yellow wires comming straight out.

Tim · #10 07-01-2002, 03:48 PM

Pic 9 - Shows new even-fire cap w/rubber-type washer, coil-to-rotor contact button & pkg. of di-electric grease. These should be the contents of either type of cap when purchased new. This is from NAPA.