Posts: 433
Location: Cedarburg, Wisconsin | If you are looking for more top end you need the motor raised as far as it will go and still give you the acceptable water pressure. Without the right height you are wasting your time playing with props. When you on plane and trimmed right, your anticavitation plate must be above the water or at worst just at water level. If it is under water you are wasting power. If I remember correctly quite a few of the E-TECs are running in the 3rd hole. Down side of this is most likely the aluminum prop won't hold on turns at this height. You probably need a stainless prop to get the max height.
Once you have the motor height correct, then you play with props to hit the top end of the specified rpm range or a little above with a very light load. No matter what, the aluminum prop is not what you want unless you are in a minefield of stumps and rocks. You can always run a vented prop for enhanced holeshot, and as mentioned before, with the motor at the right height the holeshot improves.
Go to http://www.etecownersgroup.com/ and read through the forums and you will get tons of good info including all the specs you need for water pressure, rpms, and possibly some recommendations on props.
I ran a very heavily loaded Alumacraft 185 Competitor with a hot 150HP using a 19 pitch SST and only had a 46mph top end, so with a 90 on a similar boat, subtracting 1 mph per every 5HP difference gives you about 34mph. I really believe you should do better than that though. I'd expect to hit around 36 or maybe a little better when you get it set up right. If you are expecting more than that you will be disappointed I'm afraid. |
