Posts: 433
Location: Cedarburg, Wisconsin | The OPTI has a 2.33:1 ratio vs. your 2.0:1 ratio on the E-TEC. So the same prop might not work as well. The OPTI spins 15% more engine rpms for the same propshaft rpms.
Going to SS gives you less rpms than aluminum in most cases. The SS will not flex or slip as much due to the cupping so it's stiffer pitchwise even with the same numbers. Your motor calls for a sweet spot of 5000-5200 rpms within the 4500-5500 rpm range and you should prop it to run there for the best performance from your motor. If you don't have a tach, I believe, at your dealers' shop, you can get a computerized readout from your motor's EMM showing how many hours run and at what rpms. If you check the top rpms on that report you would be able to see the range you run at. Then you would know if less rpms are acceptable. You don't want to be below that WOT sweet spot as that's just making the motor work harder than it has to for no reason. You lose performance and the motor will not run as clean/efficiently.
What are you looking to gain from a SS prop?
Edited by Almost-B-Good 9/6/2011 7:00 AM
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