Steel or AL flywheel, and HP coupler
#1
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Join Date: Oct 2003
Location: Colleyville, TX
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Steel or AL flywheel, and HP coupler
Replacing my 525SC clone with a 540 670hp engine. What type flywheel is best. I was originally thinking I could use flywheel from old engine. But it is a Merc 420 set up balanced by Derberry. and chances are externally balanced and 540 is Internal balanced.
What is best a steel or AL unit mated to a bravo. Which stresses the drive less? Anyone know the weight diference between the two? Any budget but durable brands to consider?
Can I get by reusing bravo coupler I used for 525SC? Or is it necessarry to go to HP coupler that CP Performance sells? Boat is lightweight 230 Velocity.
What is best a steel or AL unit mated to a bravo. Which stresses the drive less? Anyone know the weight diference between the two? Any budget but durable brands to consider?
Can I get by reusing bravo coupler I used for 525SC? Or is it necessarry to go to HP coupler that CP Performance sells? Boat is lightweight 230 Velocity.
#5
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With aluminum, maybe 800 RPM in gear and 600 RPM in gear with steel? Hard to say for sure, as the old automotive Holley Dominators were also part of the idle problems. Today we can idle at 450 RPM in gear without jacking with the throttles or stalling around the dock. We also have a pretty aggressive solid roller valve train.