I talked personally with John at York about labbing my props, He was extremely helpful. although I have yet to send them in.
he did tell me cruise might suffer. depends on what you want.

if thinning the props lets the motors turn more R's, thus gaining top speed, great, but in my application, I was at my bone stock peak rpm already(4600, 330's) so I told him when I do it , I will spec the lab to gain the typical 200 rpm, then cup to pull 100-200 back into increased pitch. I will specifically tell him I want to maintain 40mph at 3000 where i am at. He told me wow,most don't go into that much detail or thought. ( ie most are looking to rev a little to dial in to thier peak power output) but just tell him what i want out of the service.
This should give me the most speed possible out of my engines at their peak of 4600.

keep in mind his fees are on the order of $175 - $200 per prop, compare that with the (increase service?) of merc lab at $600+?
(just remembering mercs pricing from other posts......)


I would send what you have back to be cupped to gain some pitch. that must still be less than selling used, and buying new, and labbing the new ones........ and it seems you are very close.

good luck.

Rambunctious, I too went into such detail with John. I told him what my cruise speeds and rpms were and requested that he try to maintain them as best he could. However, he claims I told him my top speed was 72 and that I now have a 5 mph increase at top end. (Don't know where that came from, but he is convinced that I am off my rocker, I think.) I do remember something about him getting me close to the 80 mark to match the other 340's in our club.

wishful thinking.

NO...stay with the 28's

no prop is going to do it all...i have a lot of props...but for the poker run boat i use cruising props most of the time...not top ender's. Figure out what you want to do and go from there...and EVERYTHING is not really an option.


ps...keep in mind that B1's are not made to lab...they are cast ready to go...unlike the race props they build...they must be labbed after they come out.


watch out you heavy boat owners....thined props can make ya go slower!!!!

What! Have not heard that one before. Care to ellaborate?

oops...did i say that

never said a word...wazn't me!

If you can hit the rev limiter on the 28's you can run 30's. The down side is your engine will turn less RPM's and may live longer. It might be faster depending on how much torque you have.

we bang the rev limiters with 32's...can we run 34's ...NO

call the guys (and gal) at throttle up props...they know what's up!...They ARE NOT going to take an off the shelf prop that is thined and send it to you!

www.throttle-up.com

your best bet is to have 2 sets of props...remember the 30's are going to stress the drives more!!!