Re: more rpms?
Don't ya hate it when you do more than one modification at a time and you start to question the validity of one or more of them.
On the issue of jet sizes to increase rpms. I get the reasoning, ezeke, about later models having increased size high speed jet sizes and that more gas can sometimes mean more horsepower. I wonder if perhaps omc did that, not for better performance, but to prevent the notorious overheating problems with the turbojet by richening the mix.
In my opinion overheats on this drive system are more the result of poor maintenence and or sucking debris into the cooling system by running too shallow. I intend on replacing the stock jets back in the carbs and see what happens. Perhaps, as in higher altitudes, an rpm increase can be gained by running leaner. Even if it is just a tad.
Unlike an prop there is a huge difference in propulsion in regards to rpm hence their inefficiency. Once you get into that higher rpm range the performance increases exponentially. I can't help but think that even an extra 200 rpm could, wishfull thinking, result in 6-10mph gain at wot.
Told ya my tinkering spirit won't shut up.
