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Michael Mayben · 07-25-2008, 01:32 PM

Continuing on with distributor identification, here we have examples of two different "governor" distributors used primarily on both medium duty applications and stationary engine apps.

On the left is a cast iron Holley "1510 series" distributor which incorporates the governor system along with a mechanical tachometer drive. This unit was converted some time back to a Pertronix trigger, though it is NOT the same P-tron as used in the more common Holley cast aluminum distributors which are common on IH Light Line vehicle apps.

The governor unit is in actuality a small vacuum pump built into the distributor assembly, IH refers to that item as a "spinner valve"! This one carries an IH p/n of 427967 C91 and is an OEM part for a 392 in a school bus chassis.

ON the right in the pic is a virtually identical distributor but WITHOUT a mechanical tach drive. The part number tag on this item is missing, but I believe the IH p/n to be 427965 C91. The P-tron installed in that one is a somewhat older design, most likely from the time when Pertronix was known as "Perlux".

Both of these distributors are of the "curved point" design originally, and use the same breaker point set, condenser, rotor, and cap as the Holley aluminum distributor in their original form.

In order for these governor distributors to work properly, they need to be connected to an appropriate governor carburetor which was supplied by Holley to IHC, either a 2300 2V mixer, or a 4150 4V carb.

However, either of these distributors will serve in a non-governed application just fine. The units are far more robust in design and manufacturing than the aluminum-body Holley, especially in the shaft support/bushing interface. Contrary to urban myth though, they are NOT "ball bearing" distributors.

Both of these items need an extensive service procedure before they could be put into service. Both mechanical advance units are very gummy, along with the vacuum advance/breaker plate interface. The vacuum advance cans on both units are identical to the similar parts used in Light Line applications, providing 5*>7* of movement when activated.

07-25-2008, 01:32 PM	#3 (permalink)
Michael Mayben Tech Moderator Join Date: Jan 2007 Member Number: 10 Location: Leaburg, Orygone Age: 61 Posts: 1,352	Re: IHC Vehicle Distributor Identification Continuing on with distributor identification, here we have examples of two different "governor" distributors used primarily on both medium duty applications and stationary engine apps. On the left is a cast iron Holley "1510 series" distributor which incorporates the governor system along with a mechanical tachometer drive. This unit was converted some time back to a Pertronix trigger, though it is NOT the same P-tron as used in the more common Holley cast aluminum distributors which are common on IH Light Line vehicle apps. The governor unit is in actuality a small vacuum pump built into the distributor assembly, IH refers to that item as a "spinner valve"! This one carries an IH p/n of 427967 C91 and is an OEM part for a 392 in a school bus chassis. ON the right in the pic is a virtually identical distributor but WITHOUT a mechanical tach drive. The part number tag on this item is missing, but I believe the IH p/n to be 427965 C91. The P-tron installed in that one is a somewhat older design, most likely from the time when Pertronix was known as "Perlux". Both of these distributors are of the "curved point" design originally, and use the same breaker point set, condenser, rotor, and cap as the Holley aluminum distributor in their original form. In order for these governor distributors to work properly, they need to be connected to an appropriate governor carburetor which was supplied by Holley to IHC, either a 2300 2V mixer, or a 4150 4V carb. However, either of these distributors will serve in a non-governed application just fine. The units are far more robust in design and manufacturing than the aluminum-body Holley, especially in the shaft support/bushing interface. Contrary to urban myth though, they are NOT "ball bearing" distributors. Both of these items need an extensive service procedure before they could be put into service. Both mechanical advance units are very gummy, along with the vacuum advance/breaker plate interface. The vacuum advance cans on both units are identical to the similar parts used in Light Line applications, providing 5>7 of movement when activated. Attached Images __________________ EcoScout "Treehugger Mark I"