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  1. M

    Mercruiser 140 Points to Delco EST results in low RPM at WOT

    In theory what would have to be done to make the 140 turn rpms like a 3.0 with less timing? I am assuming when you say valve timing there are cam differences. what differences are there in terms of fueling?
  2. M

    Mercruiser 140 Points to Delco EST results in low RPM at WOT

    Replaced the u joints and I am happy to report I am noise free. I'll start playing with timing again to see where the limit is at idle to get 30-32* up top and hopefully see full rpms again. I can %100 confirm that setting base timing at 1* results in a rpm limit of 3600 rpm. 8* base timing...
  3. M

    Mercruiser 140 Points to Delco EST results in low RPM at WOT

    Well to update more, I am happy to report that the noise I was hearing was not in fact timing knock, it was the u joint wearing out. went up river today fishing and it lost power to the prop. The marble sound I heard was a bad ujoint, which now that I think about it is the right sound for...
  4. M

    Mercruiser 140 Points to Delco EST results in low RPM at WOT

    sad but true, :ROFLMAO:. I've been telling the wife we deserve a new boat. However she tells me " it's not as fast as it used to be" is not a good enough reason. I set timing back to 8* and I will spend some more time looking for the issue as I can. The boat is just an "upstream boat" anyways...
  5. M

    Mercruiser 140 Points to Delco EST results in low RPM at WOT

    Its not a normal 3.0 noise, it's not a good noise I am just not sure it is knock. It almost has a harmonic rattle as if something is loose and shakes at a specific RPM. Dunno I am gonna check more or blow something up looking for it.
  6. M

    Mercruiser 140 Points to Delco EST results in low RPM at WOT

    Well I am not convinced it is detonation for a couple reasons, or at least detonation due to timing. I made a mistake earlier, i had timing set at 8* base not 12* 1. setting timing at 8 vs 4 vs 1 vs -1 makes zero difference on the noise and what rpm it happens. 2. doesn't matter load or no...
  7. M

    Mercruiser 140 Points to Delco EST results in low RPM at WOT

    that's my plan, ill report back
  8. M

    Mercruiser 140 Points to Delco EST results in low RPM at WOT

    If I set my static timing to 4* my total timing ends up being ~28*, and my max rpms are ~3600-3700 rpm, which makes sense when I look at the spec on timing for a below 0C856558 serial number motor. The boat runs fine just doesn't have any top end. What I really would like to know is why...
  9. M

    Mercruiser 140 Points to Delco EST results in low RPM at WOT

    From Post #10 https://forums.iboats.com/threads/mercruiser-140-points-to-delco-est-results-in-low-rpm-at-wot.754588/post-5749825 Is the above not correct for my serial number engine? I am not arguing about the marble sound and it being bad, just trying to sort out conflicting information...
  10. M

    Mercruiser 140 Points to Delco EST results in low RPM at WOT

    My boat has a old 140, I swapped in a electric est ignition. My motor wants the higher timing advance that the points ignition did.
  11. M

    Mercruiser 140 Points to Delco EST results in low RPM at WOT

    Total timing that old 140's want is much higher than 3.0's. The book calls for 36* up top vs 24* for a 3.0 The est ignition doesn't have enough advance to get the total timing the engine wants up top.
  12. M

    Mercruiser 140 Points to Delco EST results in low RPM at WOT

    Yep, it's on the list to dig into. Gonna have to figure out a method to have a broader timing curve.
  13. M

    Mercruiser 140 Points to Delco EST results in low RPM at WOT

    It's been awhile, but I wanted to update this just in case someone else has the same issue. I have base timing set to ~12* and I am now able to rev out to ~4100 rpms which is much better than it was last year. I do have a strange marble like noise at a specific lower rpm that I need to check...
  14. M

    Mercruiser 140 Points to Delco EST results in low RPM at WOT

    Got ya. Well I got it all wired up and then the starter started making a terrible noise and the key stopped cranking so I threw in the towel for the day. Thanks again. I'll report how it runs when I get it back in the water.
  15. M

    Mercruiser 140 Points to Delco EST results in low RPM at WOT

    sorry I don't know what Manual 10 is. I've looked through the stickies etc and most of the links are dead. Can you point in the right direction?
  16. M

    Mercruiser 140 Points to Delco EST results in low RPM at WOT

    I've spent more time than I want to admit looking for that diagram. Thanks.
  17. M

    Mercruiser 140 Points to Delco EST results in low RPM at WOT

    Well my boat was already wired NO 12v but not the the dizzy. White with green stripe goes into the i-switch as 12v then a black wire out to someplace, I am tracking that down.
  18. M

    Mercruiser 140 Points to Delco EST results in low RPM at WOT

    Thanks for the wiring diagram that helps a ton. How does this change the lack of timing? Or does it?
  19. M

    Mercruiser 140 Points to Delco EST results in low RPM at WOT

    I will get out my multi meter and verify that the I-Switch is sending ground through when applied, then if that is the case I will make it so there is 12V flowing to the i-switch so when the i-switch is triggered the dizzy see's 12v Is that the correct line of thought?
  20. M

    Mercruiser 140 Points to Delco EST results in low RPM at WOT

    question about setting base timing. when I have the initial timing connector connected the the Delco and 12+V supplied I set my base timing. I set this at 6*, when I remove the Initial Timing Connection should timing stay at 6* or should it jump to something else? I am not sure if I...
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