10 - Why You Must Use DELCO EST Marine Modules for Boats

This video is a follow up to part 9 so it will make more sense if you watch part 9 first.
In this video I show that the GM DELCO EST marine ignition module has a special cranking timing curve, an ignition timing curve for idle, and a timing curve for total timing under way.
I was using a V6 engine for this video. In the future I will check the cranking timing on a V8 and 4 cylinder to confirm the same operation on those engines.
EDIT: In the video I was thinking of a v8 engine when I said the total timing should be 30°. A Vortec 4.3 V6 engine actually has a total timing of 25° so the initial timing would be 13 degrees less or 12 degrees. While this is better than 17 degrees initial I still would not recommend a car/truck module since the curve is not designed for smooth RPM transitions.

[@moraleshvac]

Hi sir good morning, thanks for your great videos , I’m trying to make my boat run but I can’t is doing the same it like the engine in the video but my is a 4 cylinders 3.0 , and I already change a lot parts but I can’t make it run , I change two parts from the distributor , the electrical parts I think it’s called pick up coil and module

[@moccasinmarine]

If you did not buy a GM module then you probably got a truck module or a defective marine module.

[@booostedtc]

Would that effect idling ive thrown 5k into my 4.3 gl-d thats doing the work myself ive replace and done everything i cant get rid of of a bad vibration at idle in gear or out of gear goes away above 1800rpm or so. I do have a auto coil on it that ive replaced 3 times just to be sure ive gotten bad parts new from the store. Love the videos

[@moccasinmarine]

To rule out timing issues and get a steady non changing timing regardless of RPM do the timing procedure again with the set timing tool but instead of setting the timing at 1 BTDC set the timing to 15-18 BTDC (anywhere around here to where the engine runs the smoothest). KEEP THE TIMING TOOL ENGAGED AT ALL TIMES DURING THIS TEST. Then watch the timing marks with the engine idling. It should be rock steady at whatever you set it at. If not you’ve got a defective distributor (shaft could be wobbling, pickup bad, etc.) PUT THE TIMING BACK TO 1 BTDC BEFORE SHUTTING OFF THE ENGINE. If the timing was steady but engine still shakes you’ve got an internal engine balance problem (balance shaft not timed properly) mixed up engine parts maybe. This is where my water moccasin tool would help. I always run my engines without the prop drive attached to rule out vibrations from the drive shaft misalignment. Connect a garden hose to your incoming water pipe in engine bay if you don’t have my tool and run engine with prop drive removed. I hope you didn’t mix parts from different engines because the rods and cranks are balanced together and are not interchangeable with other engines.

[@jameshood3692]

Part # for marine module?

[@moccasinmarine]

It’s in the first video in this playlist but you can’t find them.

[@jameshood3692]

@@moccasinmarine so the D1965A will work on boats?