Do I need this????

[FlightPlanDan]

hell, i run total loss too. got a good battery. ill agree, on a pretty much stock boat and your not going under to much, they work. just slowly. im not here to jaw with you, my opion was theyre junk and ill stand by it. different strokes for different folks i guess. far as the duckbill, www.atlantisenterprises.com

Well hell, now I know what a duckbill is! And dude, we're not arguing here! We're discussing the pro's and con's of different set-ups! (and a duckbill ain't too much money either!)
I'm sure ALL input is appreciated not just by members participating in the thread, but also by anyone reading the thread looking for answers.
It was not my intention to come across as confrontational!

 

[Cliff]

we kool man!

 

[WFO Speedracer]

I had a feeling! But when the engine compartment is dry, do you notice any problem with air/cavitation? It's well behind the impellor, but still?

No it is not possible for that to create cavitation,its just a venturi and works off the same principle as a carburetor does, simple physics.

 

[FlightPlanDan]

Cool. I thought that if the engine comp was empty, the venturi affect would still suck air and mix in with the thrust. The truth is ... I don't know why the stock bilge lines could not be larger and remove more water more quickly. My guess is that few will do what you did with the 300. But as stated in prior posts, after certain mods, it won't really matter. But it's a good thing to understand how these things work.

 

[WFO Speedracer]

Cavitation is when air gets sucked into the area around the pump,since it is a pump it will happily suck air if given the chance to,the area you are referring to is behind the pump in the exit stream,so that would not be cavitation

 

[FlightPlanDan]

Cavitation is when air gets sucked into the area around the pump,since it is a pump it will happily suck air if given the chance to,the area you are referring to is behind the pump in the exit stream,so that would not be cavitation

Exactly. I understand cavitation. (I was a sonar tech in the Navy) And I understand that it happens at the impellor/intake.

I know you're in the business and you know way more about these machines than I do. And this may seem like a "fickle" nit-pickin' kinda thing, but is it a bad thing to introduce air into the area of thrust? Is that why the stock lines are 3/8"?

I'm sure you've seen... when you lift the tail of a stock pump out of the water it shoots a white stream.
When you lift the tail of a ski with a magnum pump, it shoots clear water. No air.
I know we can't all have a magnum pump this week. But maybe even though it's not cavitation, the introduction of air into the thrust stream actually reduces thrust?
What are your thoughts?

 

[MNTURBO]

when you lift the tail of a stock pump out of the water it shoots a white stream.
When you lift the tail of a ski with a magnum pump, it shoots clear water. No air.

interesting! but I'd be willing to guess having air introduced AFTER the veins would have no effect on performance.

 

[steve-uk]

Exactly. I understand cavitation. (I was a sonar tech in the Navy) And I understand that it happens at the impellor/intake.

I know you're in the business and you know way more about these machines than I do. And this may seem like a "fickle" nit-pickin' kinda thing, but is it a bad thing to introduce air into the area of thrust? Is that why the stock lines are 3/8"?

I'm sure you've seen... when you lift the tail of a stock pump out of the water it shoots a white stream.
When you lift the tail of a ski with a magnum pump, it shoots clear water. No air.
I know we can't all have a magnum pump this week. But maybe even though it's not cavitation, the introduction of air into the thrust stream actually reduces thrust?
What are your thoughts?

really... i have a magnum pump and i notice no difference in the colour of my fountains than when i did them with my stock pump

 

[WFO Speedracer]

I am sure the mag pump are way more effeceint but there is no way they cannot get air into the exit stream,if they didn't the fish would all be dead by now,if by some miracle you do figure out how to get the ogygen separated from the water with a simple Mag pump let me know together we can make millions solving the energy crisis while riding jet skis.win win

 

[FlightPlanDan]

Gilled fish extract "disolved o2" from water.
We are talking about air, and it's introduction into the thrust stream of a pump.
Are we splitting hairs here?

 

[WFO Speedracer]

Gilled fish extract "disolved o2" from water.
We are talking about air, and it's introduction into the thrust stream of a pump.
Are we splitting hairs here?

Yes we are

 

[FlightPlanDan]

Point taken.

Where did this start?

 

[QuickMick]

there's a difference between "should" and "need to"

:biggrin:

You got it, I would think he did too.

 

[QuickMick]

For you guys talking about dual cooling, maybe these will help.

 

[dbrutherford]

Are those fittings on your bulkhead the ones from Riva for a 1300 GPR or something else from McMaster Carr or your own special I am a machinist master creation?

 

[The Penguin]

those are the pissers.

 

[mdew1622]

na that alll i use my bildge cord to my controls broke so that is all i use it like a bildge.it take the pressure from the watter goin through ur intake and sucks watter from the engine compartment so i would keep it in unless u want a dual cooling unit..

 

[WFO Speedracer]

na that alll i use my bildge cord to my controls broke so that is all i use it like a bildge.it take the pressure from the watter goin through ur intake and sucks watter from the engine compartment so i would keep it in unless u want a dual cooling unit..

say whut?

 

[dbrutherford]

What's a pisser? I might as well ask, i seemed like a rookie asking what those were.

I was just wondering if they were through bulkhead fittings he used to attach his through hull cooling lines. Unless you do a defoam, sometimes it is tought to rig up a second cooling line Hence why people use the siphon bilge through hull tube!

 

[WFO Speedracer]

pisser = cooling system indicator