Cavitation video

[sanger rat]

:eek: http://www.youtube.com/watch?v=mQvbispmUF4&feature=related

[IMPATIENT 1]

explain to me how a inducer keeps from doin that in frt of a impellor?? i have a friend that had cavitation trouble because of his inducer on top end. i'd like to see a cut away or lexan pump and see what happens inside, that'd be neato:D

[Duane HTP]

Very simple. The angle of attack of the inducer blades are such that they do not induce cavitation like the one in the picture. It speeds up the flow of water towards the impeller blade which helps to keep the impeller from doing it too. That's what makes them work. That's why the ones Don did worked so well and the ones his kid did didn't.

[Duane HTP]

i have a friend that had cavitation trouble because of his inducer on top end.
How do you know or prove this???
What if the pump was just requiring more water because of loading the impeller better with the inducer.

[cyclone]

How do you know or prove this???
What if the pump was just requiring more water because of loading the impeller better with the inducer.
Or maybe at high speed, the shape of the keel didn't work so well for loading the intake. i've seen this firsthand and its got nothing to do with the inducer being in there.

[Placecraft Dragstar]

That's why the ones Don did worked so well and the ones his kid did didn't.
So his kid changed the inducer?
The dps inducer works very well, there are only a couple things you can do to them for better performance.
The other brand of inducer can work very well also if you take a grinder to it and fix it. But there is alot of work you can do to a impeller also to make the whole combo work very well.

[IMPATIENT 1]

How do you know or prove this???
What if the pump was just requiring more water because of loading the impeller better with the inducer.
yep, contact hotbo on this site. he saw it all on his pressure gauges, removed the inducer and it went away.

[IMPATIENT 1]

So his kid changed the inducer?
The dps inducer works very well, there are only a couple things you can do to them for better performance.
The other brand of inducer can work very well also if you take a grinder to it and fix it. But there is alot of work you can do to a impeller also to make the whole combo work very well.
i've gotta tx-19 runnin a b-cut tight dom. pump, and everyone swears by the inducer in them but i can't find a reason to do it. when i holeshot, the pump loads well and pulls very hard. i set the clearences tight, did the best detail job i could on the new impellor, runnin a shouldered bronze ring. i did drill and tap the intake for gauges last spring when i rebuilt and repainted the pump, just got in a hurry to get on the water and never installed lines or gauges, just plugged the 2 holes. i can stand on it and before i can say 1, its loaded and doesn't slip. did fight a top end cavitation issue last yr. but that turned out being too much loader ramp in the water, i cut it back to 1/16th above keel and shoe, prob solved.

[Placecraft Dragstar]

i've gotta tx-19 runnin a b-cut tight dom. pump, and everyone swears by the inducer in them but i can't find a reason to do it. when i holeshot, the pump loads well and pulls very hard. i set the clearences tight, did the best detail job i could on the new impellor, runnin a shouldered bronze ring. i did drill and tap the intake for gauges last spring when i rebuilt and repainted the pump, just got in a hurry to get on the water and never installed lines or gauges, just plugged the 2 holes. i can stand on it and before i can say 1, its loaded and doesn't slip. did fight a top end cavitation issue last yr. but that turned out being too much loader ramp in the water, i cut it back to 1/16th above keel and shoe, prob solved.
If you can run what you want to without one then great, spray a little speed coat on the impeller and run it and see where it burned it off that can answer some questions on cavatation. I have a tx-19 now but have alot of work to make it go good. I have had it out a couple times now and like what it does but have not opened it up yet but getting close to. I have never had a gullwing before but so far I like it just dont know how fast I can push it to.

[IMPATIENT 1]

If you can run what you want to without one then great, spray a little speed coat on the impeller and run it and see where it burned it off that can answer some questions on cavatation. I have a tx-19 now but have alot of work to make it go good. I have had it out a couple times now and like what it does but have not opened it up yet but getting close to. I have never had a gullwing before but so far I like it just dont know how fast I can push it to.
i love my gullwing! i did speed coat the impellor when i finished detailing it,haven't pulled the bowl of yet to see what the backside looks like but the frt is still @80-90% coated still. the loader that came with the boat was blocking off 100% of the water needed at the top. i got it, checked the boat over and it ran 78 the 1st day i took it out. i knew something wasn't right so i yanked out the motor and pump:D
there's a local racer here runnin 118 in full lake trim, bench seat and even uses a partial engine cover;)
my bottom is still nice gel, but here;s a good speedcoated gullwing bottom. i think he went alittle tooooo fast:D http://***boat.com/forums/attachment.php?attachmentid=44324&stc=1&d=1196704157

[Pops@Aggressor]

i've gotta tx-19 runnin a b-cut tight dom. pump, and everyone swears by the inducer in them but i can't find a reason to do it. when i holeshot, the pump loads well and pulls very hard. i set the clearences tight, did the best detail job i could on the new impellor, runnin a shouldered bronze ring. i did drill and tap the intake for gauges last spring when i rebuilt and repainted the pump, just got in a hurry to get on the water and never installed lines or gauges, just plugged the 2 holes. i can stand on it and before i can say 1, its loaded and doesn't slip. did fight a top end cavitation issue last yr. but that turned out being too much loader ramp in the water, i cut it back to 1/16th above keel and shoe, prob solved.An Inducer is a BAND AID to a Keel, Shoe, Intake Load Problem. A Inducer is far more Cavitational then a Encapsilated Impeller which receives a clean load.
We build Axial Flow Impellers everyday. Cavitation is formed by the fact as you screw or sling the water, the axial Or prop has ending surfaces and the force allows water to slide off and escape the primary push force. As this happens you have a void in the surface. the photo shows the largest amount is built up at all edges and trys to form a vortex then slings out.
5300 GPM in (Don's Own Numbers) to a Pump of (Most General) 4,000 out- Something is going on in there, the numbers due not match constant equal pressure flow. Axial Flow wants to push water and cannot lift water due to its low pressure, where as a Mixed Flow builds a much higher pressure and by that fact can lift or throw which ever you choose far higher. Axial has been used for over 50 years as preloaders in the Pump industry. Dwayne sent me a Impeller 8-10 years ago which was funny because the guy had it all backwards. He home modified it by putting the Axial at the exit point of the Encapsulated Impeller vs Prior. In dointg so he went from high pressure to low pressure. Stop and think what to do with a pump that will not load, it has air entrapment and untill you remove that blockage with pressure you go no whare. So you prime it, So if the numbers don't match as a pure set up (the best) you get the Band Aid. In the end it has no effect on the winner, if he runs one or not. It is what it is!. and the Winner generqally gets thrown in the Water anyway.

[Warp Speed]

there's a local racer here runnin 118 in full lake trim, bench seat and even uses a partial engine cover;)
Chop???? :D
Warp Speed ;)

[maxwedge]

So I can only imagine what happened to Thumpers 1 thru 4.:idea:
http://***boat.com/forums/attachment.php?attachmentid=44324&stc=1&d=1196704157

[Placecraft Dragstar]

there's a local racer here runnin 118 in full lake trim, bench seat and even uses a partial engine cover;)
:D http://***boat.com/forums/attachment.php?attachmentid=44324&stc=1&d=1196704157
118 mph not bad but I am leaning more into the 120's mph. Just do not want to be a statistic. If you run a blown boat you will not keep speed coat on the face of the impeller that will be the first to go.

[IMPATIENT 1]

http://***boat.com/forums/attachment.php?attachmentid=44338&stc=1&d=1196713591
you sure about that?:D

[IMPATIENT 1]

http://***boat.com/forums/attachment.php?attachmentid=44338&stc=1&d=1196713591
you sure about that?:D
here's a little launch video, i couldn't stay in it for just a couple second cause i was having fuel delivery issues. as soon as the boat started building boost on the launch, it'd jump the boat outta the water and bounce me,lol. i had to learn how to control a blown motor, i got better at it by summer's end:D
http://s107.photobucket.com/albums/m304/oumills/?action=view&current=MOV01007.flv

[Devilman]

118 mph not bad but I am leaning more into the 120's mph. Just do not want to be a statistic. If you run a blown boat you will not keep speed coat on the face of the impeller that will be the first to go.
http://***boat.com/forums/attachment.php?attachmentid=44338&stc=1&d=1196713591
you sure about that?:D
Probably means you gotta have more than 4 hours of running time though, before you'll see any of the speedcoat worn away. :idea: :jawdrop:
I'm just sayin... :D

[Placecraft Dragstar]

Probably means you gotta have more than 4 hours of running time though, before you'll see any of the speedcoat worn away. :idea: :jawdrop:
I'm just sayin... :D
LOL it would happen after 1 or 2 passes

[Placecraft Dragstar]

http://***boat.com/forums/attachment.php?attachmentid=44338&stc=1&d=1196713591
you sure about that?:D
Yes I am sure:D You have a nice looking boat.

[IMPATIENT 1]

thanx placecraft! the trailer is coming out from under it before jan and a friend is gonna blast it for me, then i'm shooting it white, have another friend free hand some pinstripes on it.
d-man, sux on des nutssss:D :D

[IMPATIENT 1]

ok, enough of the thread jack,lol
we need to start a impellor detailing thread, since that's where it all starts.