Port my own prop?

[snowthrower]

I was wondering if anyone has a link to info on porting my own prop?<br /><br />Is it worth it? I have a 1967 seaswirl 18' with a perfect running mercruiser 120 i\o it run's good but could use a little more omf off the line when towing. I read a few things on this site before about doing this my self but now that I want to do it I can't find the info. <br /><br />Thanks

 

[prockvoan]

Re: Port my own prop?

They have prop shops that do it for under $40.00.What kind of rpm's you turning at top end?Looking to give up top end speed for a faster hole shot?

 

[nrladeere]

Re: Port my own prop?

My new stainless Rapture came ported. Makes a big difference in hole shot and no other real negatives. Go for it.

 

[tommays]

Re: Port my own prop?

<br /><br />theres is really no down side if its done right BUT you need to start with the correct prop on the boat<br /><br />the venting is going to allow a controled slip at low speeds and will not affect top speed at all<br /><br />

<br /><br /> http://www.marinemechanic.com/site/page76.html <br /><br />tommays

 

[snowthrower]

Re: Port my own prop?

tommays,<br /><br />Thanks that is the kind of info I was looking for. The boat has a ton of top end and I could stand to loose some if (and only if) need be. <br /><br />I just wanted it to hit harder off the line, it's a big old boat but pull's good, but never being satisfied I want alittle more off the line. That and the prop on the boat in brand new (when I bought the boat) and was simply a replacemnt for the factory installed prop.

 

[achris]

Re: Port my own prop?

I put a vented Laser III prop on my boat (20' cabin w/4.3LX). The normal prop was ok with holeshot, but this prop was like being hit in the backside with a Saturn V rocket!!!<br /><br />The only downside was that at my normal cruising speed was right on the crossover point from venting to not venting and it was a bit dragging. The thing to remember when drilling the prop is to start small and increase the hole size by small increments. When you find the right spot, stop, don't be tempted to go the next size up because you think it might be better.<br /><br />Chris.............