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  1. Scott06

    Is My Impeller Bad? Mercruiser 228

    When was last time heat exchanger was cleaned. Most heat exchanger /fresh water kits use a bravo style belt driven pump on older mc1 and alpha gen one set up i believe. You need to move more water through the heat exch than raw water. Did it ever work with this heat exch or did you put it on...
  2. Scott06

    Replace Bravo2 Lower Unit W/ Bravo

    Yes but what prop size are u running bravo 2 allows for huge prop diameters for certain applications Like house and workboats
  3. Scott06

    Squeezing more from 5.0L 220hp

    I have a 5.0 with this manifold https://www.michiganmotorz.com/5-7l-4-bbl-vortec-cast-iron-intake-manifold-1996-current and an edlebrock 1409 has excellent throttle response and midrange. came as part of a partial engine from Mich Motorz i have that in a 21 ft bowrider thats heavy for its...
  4. Scott06

    same speed with different props

    I thought that the reason they give a wot rpm range is the power in that rpm range is basically the same. The dyno curve on the vortec flattens out in that rpm range Some engines have tighter wot range hence the one inch pitch increments in props now. and i completely agree prop to the top of...
  5. Scott06

    same speed with different props

    to go faster you need more power, your engine makes the same power from 4400-4800 rpm. I ran into the same issue played with different props and you are hitting the wall in terms of what that engine and hull combo can do, engine doesn't have enough power to turn the higher pitch prop any...
  6. Scott06

    Clanking/rattling sound after prop change

    Seems correct for your serial number- your initial timing (set in base mode) should be 1 deg BTDC- not in base mode 12 deg , then total timing 23 BTDC at 2800 rpm. if for some reason module is bad could be pulling in more advance... or could need setting
  7. Scott06

    Clanking/rattling sound after prop change

    Check that that the timing not only intial but full advance is correct As mentioned by others the idle mix screw is only for idle through about 1500 rpm then the main venturi takes over. Things that will lean out main mix is any obstruction in fuel delivery- Pump pick up tube clogged...
  8. Scott06

    new GM 5.7 engine holes near oil filter

    Yeah If I recall there is a tapped hole that goes into the flywheel area ...
  9. Scott06

    outdrive swap ? alpha 1st gen what can i use ?

    I would leave the harness with the motor complete bobtail swap both engines should have the same 10 pin plug to connect to helm harness
  10. Scott06

    Merc part number for this bolt?

    Should be part number 12 https://www.marineengine.com/parts/mercruiser-sterndrive-parts/alpha-one-genii-1998-and-up/0l100040-up/driveshaft-housing-and-driveshaft
  11. Scott06

    outdrive swap ? alpha 1st gen what can i use ?

    solution is easy take drive line engine, transom, outdrive from baja and drop it into the Chris craft. Will be bolt in. check stringers and transom for rot when you have driveline out. sell transom housing and drive off Chris craft
  12. Scott06

    Fuel System questions for Mercruiser 260 EFI Conversion

    you will need these to stab in oxygen sensors https://www.michiganmotorz.com/o2-spacer-stock-mercury-riser-wet-joint scott is correct you need programming changed to marine temps to get it out of open loop (ignoring o2 sensor) warm up mode
  13. Scott06

    outdrive swap ? alpha 1st gen what can i use ?

    Rick has you steered straight. R, MR, Alpha one gen one drives will fit and be fine strength wise. A earlier MC1 will also bolt up but is older. you can also use an SEI aftermarket gen one replacement. Assume you have a bad drive or two?
  14. Scott06

    1995 4.3 liter mercruiser

    Aluminum boats typically have wood blocks screwed to stringers or aluminum angle bolted to them. Look at starcraft restos on here for more details @Bondo likely has some experience
  15. Scott06

    Is My Impeller Bad? Mercruiser 228

    Are you using an OEM merc impeller /housing or aftermarket OEM is worth the money
  16. Scott06

    1995 4.3 liter mercruiser

    Someone didn't know WTF they were doing would be my guess. Do you have separate cooling hoses feeding both the manifolds and elbows? if so you need the check balls. If you have just two hoses feeding the exhaust manifolds only (passes water up through elbows constantly even when thermostat is...
  17. Scott06

    Mercury 3.0 EST no spark

    Old possibly watery gas drain the gas and clean out not adjust mixture screw … take a sample of your fuel and let it is in a jar. You will see if this is the issue
  18. Scott06

    Volvo Penta 4.3 Raw Water / Electric Pump?

    I cant see the check valves/balls in the diaphragm pump doing well with sand and debris in normal raw water. Having used both electric and AODs in industrial settings i think you would do a bunch of work to end up with a less reliable system whats the opposition to replacing the existing pump...
  19. Scott06

    5.0 Mercruiser Cutting Out While Underway

    Agreed at this point dont think its the module start with the trigger sensor inside dist heres the TB troubleshooting guide https://forums.iboats.com/threads/how-mercruiser-thunderbolt-ignition-systems-work.676476/
  20. Scott06

    5.0 Mercruiser Cutting Out While Underway

    Pretty sure yours is the Thunderbolt V ignition, not the Delco EST that is available at auto parts stores. The module will only be available through merc, and looks to be discontinued. https://www.marineengine.com/parts/mercury_marine_parts/sn/0M616574/4M11025RS/8182_40 Have had good luck find...
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