C.Fisher
07-10-2005, 10:27 PM
We are running two 454's with Holley 250 s,chargers 5#s boost. The ignition from what we can tell is Mercruiser Thunderbolt 5 dizzys. Originally we think this boat was fuel injected 300hp 454's. But someone switched them to carb blower motors that have had a host of problems that we are now sorting out. For instance we are getting 40 degrees advance with 8 degrees intial timing. We need to back this off to no more than 30-33 cause of the blowers. What can we do with these dizzys aside from swithcing out to MSD products.
From what I read in a mercruiser manual these dizzys have knock sensors and modules but how in the hell do those work since there is no computer for fuel injection any more. I am lost so please help. I have searched and did not really come up with many answers. Boat is a 2001 checkmate convincor.
Thanks in advance
From what I read in a mercruiser manual these dizzys have knock sensors and modules but how in the hell do those work since there is no computer for fuel injection any more. I am lost so please help. I have searched and did not really come up with many answers. Boat is a 2001 checkmate convincor.
Thanks in advance