What props do you run on your 29 outlaw
02-19-2010, 10:42 AM
#11
Registered
What he is saying is 99% of the boats (29's) that went out of the Bucyrus doors has the same propeller on them regardless of the engine package.
The RPM ranges of the 454, 496 & 502's were/are different depending on HP.
The 454 came in 2 hp levels when it became fuel injected. 310(330 later?) & 385hp.
The upper RPM limit of the lower HP 454 was only 4800 +/- 50 rpm & the 385 motor was 5200 +/- 50 rpm.
Now you have 2 identical boats with different engine packages, both equipped with the same propellers (24p B1's). The one with the lower HP motor may be just slightly over propped, meaning the motor doesn't have quite enough poop to get to it's maximum RPM & or have a boat that is under propped meaning the RPM will spin faster than it's maximum rating.
There is an inverse of that example, which I think is what is confusing you.
Your boat is over propped, which is good for you. This leads us to lab finishing.
By lab finishing your propellers you can gain RPM. The lab finish process tailors propellers to match your boat's characteristics.
Much like an off the rack suit, it may fit well but there are areas that need taken in or out to accommodate your build. That is where a tailor (lab finisher) comes in.
Make sense now?
The RPM ranges of the 454, 496 & 502's were/are different depending on HP.
The 454 came in 2 hp levels when it became fuel injected. 310(330 later?) & 385hp.
The upper RPM limit of the lower HP 454 was only 4800 +/- 50 rpm & the 385 motor was 5200 +/- 50 rpm.
Now you have 2 identical boats with different engine packages, both equipped with the same propellers (24p B1's). The one with the lower HP motor may be just slightly over propped, meaning the motor doesn't have quite enough poop to get to it's maximum RPM & or have a boat that is under propped meaning the RPM will spin faster than it's maximum rating.
There is an inverse of that example, which I think is what is confusing you.
Your boat is over propped, which is good for you. This leads us to lab finishing.
By lab finishing your propellers you can gain RPM. The lab finish process tailors propellers to match your boat's characteristics.
Much like an off the rack suit, it may fit well but there are areas that need taken in or out to accommodate your build. That is where a tailor (lab finisher) comes in.
Make sense now?
Another curiousity: right on my engine it states 5000max RPM yet I have the Mag MPI 385's? Thanks.
02-19-2010, 12:30 PM
#15
Custom Interiors & More
iTrader: (1)
Sounds a little high for Mags? (maybe thats were the rev. limiter hits)
My post was general info. off the top of my head without detailed research. You always have many factors that cause RPM differences, and need to refer to the owners manual for the engine year and model spec. A 385 Mag. turning 4800 is a great example of a set of props to have labbed.
XT
02-19-2010, 04:56 PM
#19
He did say something about "belt driven air cleaners". I don't know. I just filler up & pin the sticks.
It has this weird high pitched gear noise from about 3500rpm & up. I don't know what it is so I just turn up the stereo to drown it out.
It has this weird high pitched gear noise from about 3500rpm & up. I don't know what it is so I just turn up the stereo to drown it out.
