Moderator: Team Cub
G'day to you and congrats on getting your own home brewed splitter. I haven't looked around for a Wisconsin Engine forum but I assume it would be out there. However some of our members are right smart fellows and know their way around them Wisconsins. I think Eugene is one of the first that comes to mind.
Eugene wrote:Timing marks. First mark at around 9:30 o'clock on the shroud will be the advance mark. Next mark at around 10 or 10:30 will be the TDC mark for cylinder #1 and #3. Mark on shroud at around 1:30 o'clock will be the TDC mark for cylinder 2 & 4. The fin with the "X" is the TDC crankshaft timing mark.
Firing order is 1-3-4-2. #1 cylinder is the one closest to the shroud on the left side/bank. #3 cylinder rear left side. #2 cylinder front right bank.
Distributor cap wire locations vary by model and magneto or distributor. On some engines the distributor/magneto spark plug wires are not in engine firing order.
My current thought and suggestion. Since we know where the timing marks are and the engine runs. Remove the distributor cap, rotate the engine until the rotor points to the #1 spark plug tower location and the points just opening. This is point where the engine was firing at engine cranking speed.
Now either back up or roll the engine forward until the mark on the fin and the TDC #1 and #3 cylinder mark on the shroud line up.
You will probably have to remove the distributor to retime the distributor to the engine. You want the rotor to point to the center of the #1 spark plug tower and the points just opening - called static timing.
Edit: Spark plug wire location on distributor cap. Most 4 cylinder engine, the distributor or magnet operates at 1/2 engine rpm and the firing order and spark plug wiring in the distributor cap will match the firing order. EG. clock wise or counter clock wise. #1, #3, #4, #2. But on some Wisconsin engines the spark plug wire location is either clock wise or counter clock wise. #1, #2, #3, #4 with the same firing order, 1-3-4-2.
Since the distributor cam lobes are not regular in your distributor, thinking your distributor cap wiring order is 1-2-3-4. But I really don't know since I do not have the manual for your engine.
Another edit: I don't know where the #1 spark plug tower location is on the distributor cap. Just checked another Wisconsin service manual for a different 4 cylinder engine. The manual for this series engines shows completely different #1 plug tower locations on the distributor cap.
Skyhawk Greg wrote:The VP4D definitely exists. The Wisconsin service manual for it is Issue MM-233B.
JDemaris wrote:VP4 and VP4D is 3 1/2" bore by 4" stroke - and is what you have. 154 cubin inches.
With any of the Wisconsin engines - the "D" at the end means it has Stellite exhaust valves and seats. 23 horse at 1400 RPM, 29 horse at 1800 RPM, and 31 horse at 2200 RPM.
Firing order is 1-3-4-2
Came in crank start and/or electric.
For ignition, came with a mag or battery-powered distributor.
Note - if battery igntion - there were two different distributors:
Half-speed distributor - Auto-Lite 1AD-4036-A
Full-speed distributor - Auto-Lite 1GW-4159-A
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