i drillled ventilation holes and it helped my 3.0 a lot don do mean the rear

[tommays]

<br /><br /><br />been wanting to try this because a 14 x 19 is the right prop but i allways get a really bad holeshot<br /><br />i used a 1/4 in hole and dont think i would want to go bigger i think it would vent to much<br /><br /> it has compleatly changed how the boat performs with this size prop for the better<br /><br />it allowed the motor to get up to and rpm out of the hole were it could push the prop at low speed and not get a lot of bow rise<br /><br />i used the plan posted from<br /><br /> http://www.marinemechanic.com/site/page76.html <br /><br />i liked it enough i going to pickup a new 14 x 19 this week because the test prop was my spare and is pretty beat up<br /><br /><br />tommays

 

[Don S]

Re: i drillled ventilation holes and it helped my 3.0 a lot don do mean the r

Re: i drillled ventilation holes and it helped my 3.0 a lot don do mean the r

Not sure if it's a Merc or OMC prop, but the outer ring is missing. Bet if it was there the thing would work a lot better.

 

[tommays]

Re: i drillled ventilation holes and it helped my 3.0 a lot don do mean the r

Re: i drillled ventilation holes and it helped my 3.0 a lot don do mean the r

<br /><br /><br />like the rear of this don ?.<br /><br /><br />

<br /><br /><br />none of the new Michigan Wheel - Vortex Propeller Series had had them for a long time<br /><br />tommays

 

[Don S]

Re: i drillled ventilation holes and it helped my 3.0 a lot don do mean the r

Re: i drillled ventilation holes and it helped my 3.0 a lot don do mean the r

I gotta get away from this computer for a while.<br /><br />I was looking at the wrong end of the prop..... Oops..Again.

 

[Trent]

Re: i drillled ventilation holes and it helped my 3.0 a lot don do mean the r

Re: i drillled ventilation holes and it helped my 3.0 a lot don do mean the r

Don need's to get a life! Almost as much as I do!

 

[jeff13601]

Re: i drillled ventilation holes and it helped my 3.0 a lot don do mean the r

Re: i drillled ventilation holes and it helped my 3.0 a lot don do mean the r

I have a couple extra props. I have a 120 on a 22 foot Sylvan. I would fall within their specs wouldnt I?

 

[Boomyal]

Re: i drillled ventilation holes and it helped my 3.0 a lot don do mean the r

Re: i drillled ventilation holes and it helped my 3.0 a lot don do mean the r

Originally posted by Don S:<br /> Not sure if it's a Merc or OMC prop, but the outer ring is missing. Bet if it was there the thing would work a lot better.

I had the plastic ring break off of a 15" OMC prop. It ran so bad I thought the hub was slipping. However, as stated above, new Michigan props have a built in flair on the rear. They seem to work ok. <br /><br />I would like to try ventilating my 15 x 19, on my 302 OMC OD, just to see if it does anything. They say you can just epoxy up the holes if it causes a problem.

 

[vipzach]

Re: i drillled ventilation holes and it helped my 3.0 a lot don do mean the r

Re: i drillled ventilation holes and it helped my 3.0 a lot don do mean the r

Another thread I read about doing this said to start with a smaller hole and 1/4 inch was probly the biggest you would want to go. My rapture prop came with the holes already drilled in it.

 

[tommays]

Re: i drillled ventilation holes and it helped my 3.0 a lot don do mean the r

Re: i drillled ventilation holes and it helped my 3.0 a lot don do mean the r

i needed a LOT of slip because its a 20 ft with a 3.0 but the 19 gives the right RPM at WOT<br /><br />so i went right with the 1/4 in worst that could happen tap it 5/16 and drill plugs with a smaller hole and lock-tite<br /><br /><br />tommays