SoCal Jet Boats

Tech Talk => Jet Pumps => Topic started by: steves86ta on June 28, 2016, 10:00:33 AM

Title: reverse chute drag
Post by: steves86ta on June 28, 2016, 10:00:33 AM
How restrictive would the reverse chute be on a standard nozzle?

I am considering cutting most of mine off if it would be of benefit while i am saving/collecting parts for a diverter.

Or Does anyone have a stock nozzle for cheap that i could cut to try? i'd leave some of the chute left to have a little reverse. Kind of like an AT nozzle.

What say you?
Title: Re: reverse chute drag
Post by: steves86ta on June 28, 2016, 10:02:06 AM
heres what i have now

(http://img.photobucket.com/albums/v643/steves86ta/Mobile%20Uploads/20160320_105500_zpsktuzqxot.jpg) (http://smg.photobucket.com/user/steves86ta/media/Mobile%20Uploads/20160320_105500_zpsktuzqxot.jpg.html)
Title: Re: reverse chute drag
Post by: mash on it on June 28, 2016, 10:51:08 AM

Cut it off. (Saw'd Off !, lol) Reverse is over rated, and nearly useless with a rideplate anyway.

Mine doesn't drag, but I don't have a droop, either, just a diverter and rideplate.

Rideplate to reverse chute is nearly a foot on mine.

Dan'l
Title: Re: reverse chute drag
Post by: WhyNot76 on June 28, 2016, 10:57:25 AM
My panther is similar to what you have (chute only obviously lol) I sharpened the leading edges of the chute. On mine it sorda scoops up and makes a lil roost.  I obviously didn't really do it for any gains or anything, I was just messing around, after that and a couple other things I did notice slight improvements though.


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Title: Re: reverse chute drag
Post by: steves86ta on June 28, 2016, 12:55:45 PM
Cut it off. (Saw'd Off !, lol) Reverse is over rated, and nearly useless with a rideplate anyway.

Mine doesn't drag, but I don't have a droop, either, just a diverter and rideplate.

Rideplate to reverse chute is nearly a foot on mine.

Dan'l

You'd be surprised, my reverse works pretty good to be honest. I have a line on a stock one for cheap, so ill cut this one and see what happens
Title: Re: reverse chute drag
Post by: steves86ta on June 28, 2016, 12:56:52 PM
My panther is similar to what you have (chute only obviously lol) I sharpened the leading edges of the chute. On mine it sorda scoops up and makes a lil roost.  I obviously didn't really do it for any gains or anything, I was just messing around, after that and a couple other things I did notice slight improvements though.


Sent from my iPhone using SoCal Jet Boats

thanks for the info. The way mine is right now, i throw a pretty decent roost when on it hard. (im the one in front on this pic)

(http://img.photobucket.com/albums/v643/steves86ta/lead_zpsrihyjngh.png) (http://smg.photobucket.com/user/steves86ta/media/lead_zpsrihyjngh.png.html)
Title: Re: reverse chute drag
Post by: mash on it on June 28, 2016, 01:30:16 PM
You'd be surprised, my reverse works pretty good to be honest. I have a line on a stock one for cheap, so ill cut this one and see what happens

MY reverse is almost useless, but its a 21' Daycruiser.

Dan'l
Title: Re: reverse chute drag
Post by: jimpen on June 28, 2016, 03:53:03 PM
Steve at WOT your reverse bucket should be out of the water for the most part.  I have seen this with big cruisers with a go pro video not just on the faster boats.  Check into it before you kill your ability to have a reverse.
Title: Re: reverse chute drag
Post by: steves86ta on June 28, 2016, 03:55:20 PM
Steve at WOT your reverse bucket should be out of the water for the most part.  I have seen this with big cruisers with a go pro video not just on the faster boats.  Check into it before you kill your ability to have a reverse.

Thats a good idea. I do have  a go pro i could mount back there
Title: Re: reverse chute drag
Post by: jimpen on June 28, 2016, 03:56:19 PM
Thats a good idea. I do have  a go pro i could mount back there
  Good deal  :thumbup: :thumbup:
Title: Re: reverse chute drag
Post by: 08chevyguy on June 28, 2016, 04:23:05 PM
i am very curious to hearing what you find out because i have been wondering about that myself.
Title: Re: reverse chute drag
Post by: steves86ta on June 28, 2016, 04:30:35 PM
If i can get the camera thing to work out and not sink to the bottom of the lake. Ill try to get a video and post it
Title: Re: reverse chute drag
Post by: jimpen on June 28, 2016, 04:43:50 PM
send your email address Steve and i will send you a video.
Title: Re: reverse chute drag
Post by: steves86ta on June 28, 2016, 04:44:25 PM
send your email address Steve and i will send you a video.
My email is

Steves08gxp@gmail.com
Title: Re: reverse chute drag
Post by: mash on it on June 28, 2016, 05:01:51 PM
If i can get the camera thing to work out and not sink to the bottom of the lake. Ill try to get a video and post it

Use a leash on the go pro.   :thumbup:

I've watched mine at ~35 mph, and it is just out of the water. rear jump seats work good for that.

I could see with a droop, it would be closer, and maybe drag some.

Higher speeds less dragging? I don't know.

Dan'l
Title: Re: reverse chute drag
Post by: steves86ta on June 28, 2016, 05:47:29 PM
Use a leash on the go pro.   :thumbup:

I've watched mine at ~35 mph, and it is just out of the water. rear jump seats work good for that.

I could see with a droop, it would be closer, and maybe drag some.

Higher speeds less dragging? I don't know.

Dan'l

Think the idea is higher speed. More lift less drag
Title: Re: reverse chute drag
Post by: steves86ta on June 28, 2016, 05:50:47 PM
Here's the pic from Jim

(http://img.photobucket.com/albums/v643/steves86ta/Mobile%20Uploads/IMG_1730-1_zpsuswq7phg.jpg) (http://smg.photobucket.com/user/steves86ta/media/Mobile%20Uploads/IMG_1730-1_zpsuswq7phg.jpg.html)
Title: Re: reverse chute drag
Post by: JordanDangerfield on June 28, 2016, 05:50:57 PM
I have a stock berk nozzle you can have.


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Title: Re: reverse chute drag
Post by: jimpen on June 28, 2016, 05:57:00 PM
Here's the pic from Jim

(http://img.photobucket.com/albums/v643/steves86ta/Mobile%20Uploads/IMG_1730-1_zpsuswq7phg.jpg) (http://smg.photobucket.com/user/steves86ta/media/Mobile%20Uploads/IMG_1730-1_zpsuswq7phg.jpg.html)
  This is a picture from the Rat Bastard boat.
Title: Re: reverse chute drag
Post by: steves86ta on June 28, 2016, 05:59:14 PM
  This is a picture from the Rat Bastard boat.

It's a good one too. I'm really curious about how mine looks
Title: Re: reverse chute drag
Post by: jyeager on June 28, 2016, 08:42:32 PM
Yours should be well out of the water. Check it on the trailer.
Title: Re: reverse chute drag
Post by: steves86ta on June 28, 2016, 08:47:41 PM
Yours should be well out of the water. Check it on the trailer.

Check what on the trailer?
Title: Re: reverse chute drag
Post by: jyeager on June 28, 2016, 09:00:15 PM
Check what on the trailer?
your reverse gate.
Title: Re: reverse chute drag
Post by: steves86ta on June 28, 2016, 09:01:54 PM
your reverse gate.

Oh. No I know the gate opens up all the way.

I was asking about the chute causing drag, but after seeing your pic and the one I got from Jim. It looks like mine "should" be out of the water.

But yes my gate opens all the way
Title: Re: reverse chute drag
Post by: jyeager on June 28, 2016, 09:07:21 PM
Lol my bad. Long day, didnt read that right.
Title: Re: reverse chute drag
Post by: steves86ta on June 28, 2016, 09:07:49 PM
Lol my bad. Long day, didnt read that right.

Haha. All good bud thanks for the help though
Title: Re: reverse chute drag
Post by: vwagon13 on June 29, 2016, 01:34:52 AM
Here's the pic from Jim

(http://img.photobucket.com/albums/v643/steves86ta/Mobile%20Uploads/IMG_1730-1_zpsuswq7phg.jpg) (http://smg.photobucket.com/user/steves86ta/media/Mobile%20Uploads/IMG_1730-1_zpsuswq7phg.jpg.html)
Thanks for posting that pic. Always curious what the 'lil mini-ride-plate actually  did. Feel'n better about spending all that cash. $$$
Title: Re: reverse chute drag
Post by: steves86ta on July 07, 2016, 10:25:15 AM
Took some video of mine this past weekend, and it does seem to drag a tiny bit in the water. Enough to make a difference idk.

But something else happened. My Forward/reverse cable broke. so instead of wasting a day on the water. I pulled the reverse bucket off and ran it.

I did change impellers at the same time (see my other thread)

but something i learned, was my holeshot improved greatly with the new impeller/no bucket. No reason why the impeller would have made a difference. Im curious if the no bucket might have helped. I would assume the holes for the pivot pins would leak off a lot of pressure.

What do you think?

Ill try to get the videos uploaded tomorrow
Title: Re: reverse chute drag
Post by: vwagon13 on July 07, 2016, 10:59:47 AM
Took some video of mine this past weekend, and it does seem to drag a tiny bit in the water. Enough to make a difference idk.

But something else happened. My Forward/reverse cable broke. so instead of wasting a day on the water. I pulled the reverse bucket off and ran it.

I did change impellers at the same time (see my other thread)

but something i learned, was my holeshot improved greatly with the new impeller/no bucket. No reason why the impeller would have made a difference. Im curious if the no bucket might have helped. I would assume the holes for the pivot pins would leak off a lot of pressure.

What do you think?

Ill try to get the videos uploaded tomorrow
if I'm reading your post correctly you change the impeller and removed the bucket? Just the impeller change would have made a huge difference. Correct?
Title: Re: reverse chute drag
Post by: steves86ta on July 07, 2016, 11:02:36 AM
if I'm reading your post correctly you change the impeller and removed the bucket? Just the impeller change would have made a huge difference. Correct?

Yes. But it shouldn't have. Both impellers are in brand new condition.

Differences between the two.

Old impeller is a B- American turbine Aluminum that B1 cut down for me, it was also machiend to set the clearances at .030"
New impeller is a box stock Berkeley C impeller. With much "looser" clearances. Was put in to test top end/crusie and possibly have the AT cut down. But i REALLY dont want to take it apart with how its running right now
Title: Re: reverse chute drag
Post by: vwagon13 on July 07, 2016, 11:10:41 AM
Well heck yeah, sounds like you're pretty happy with it. Why screw with a good thing!
Title: Re: reverse chute drag
Post by: steves86ta on July 07, 2016, 11:11:38 AM
Well heck yeah, sounds like you're pretty happy with it. Why screw with a good thing!

I just want to know why! By all means it should not make a difference. Unless maybe theres an angle difference or something with the AT impeller.

Its frustratign
Title: Re: reverse chute drag
Post by: mash on it on July 07, 2016, 11:24:43 AM
Yes. But it shouldn't have. Both impellers are in brand new condition.

Differences between the two.

Old impeller is a B- American turbine Aluminum that B1 cut down for me, it was also machiend to set the clearances at .030"
New impeller is a box stock Berkeley C impeller. With much "looser" clearances. Was put in to test top end/crusie and possibly have the AT cut down. But i REALLY dont want to take it apart with how its running right now

Steve-

My experiance has been the opposite-

Berk A2 impy pulled to 5050 (loose pump)
American Turbine AA pulled it down to 4900, 4950 in cooler weather (.012"/side, .017" f-to-r)
American turbine has a sh*tload more holeshot, vs. the Berk A2
(same bowl, diverter, etc)

Very interesting findings.

Dan'l
Title: Re: reverse chute drag
Post by: FordLover on July 07, 2016, 12:51:56 PM
I just want to know why!

Its frustratign

I can see you now....
"Damn it, boat is running better"!!!

Lol! This is funny. Better to be lucky than good.
Title: Re: reverse chute drag
Post by: steves86ta on July 07, 2016, 01:05:12 PM
I can see you now....
"Damn it, boat is running better"!!!

Lol! This is funny. Better to be lucky than good.

You have to know how that is. Just doesnt make sense.

Im almost wondering if i didnt install my bowl correctly or something last time.

I cant see the no revers bucket causing an issue. But maybe. Fuk i dont knwo
Title: Re: reverse chute drag
Post by: steves86ta on July 07, 2016, 04:04:40 PM
heres a horrible attempt at me videoing the launch.

https://www.youtube.com/watch?v=81c1A_Hf2j8 (https://www.youtube.com/watch?v=81c1A_Hf2j8)
Title: Re: reverse chute drag
Post by: steves86ta on July 07, 2016, 04:16:05 PM
looks like the AT impellers are machined at a 33.5* angle and the berkeley is at a 56.5* angle...

wonder if that has anything to do with it
Title: Re: reverse chute drag
Post by: mash on it on July 07, 2016, 05:20:02 PM
looks like the AT impellers are machined at a 33.5* angle and the Berkeley is at a 56.5* angle...

wonder if that has anything to do with it

Thats all where the dumb end of the tape measure is...

90* - 33.5* = 56.5*. Make sense?

Dan'l
Title: Re: reverse chute drag
Post by: steves86ta on July 07, 2016, 05:45:42 PM
Thats all where the dumb end of the tape measure is...

90* - 33.5* = 56.5*. Make sense?

Dan'l

Someone on another site said the same thing

I'm to stupid to understand
Title: Re: reverse chute drag
Post by: mash on it on July 07, 2016, 07:46:53 PM
Someone on another site said the same thing

I'm to stupid to understand

There is another site?  :sly:

Dan'l
Title: Re: reverse chute drag
Post by: Flusher on July 07, 2016, 08:25:10 PM
There is another site?  :sly:

Dan'l

X2
Title: Re: reverse chute drag
Post by: Flusher on July 07, 2016, 08:39:22 PM
When we cut an A or smaller, the angle is always 33-degrees to the shaft centerline.  Most of the aluminum A impellers that come in to get cut are 30-degrees to the centerline.  A 30-degree A impeller is bigger than a 33-degree A impeller, meaning that the vanes are longer and therefore absorb more power.  33-degrees makes the ends of the vanes basically square.
Title: Re: reverse chute drag
Post by: steves86ta on July 08, 2016, 09:52:55 AM
heres the video i promised. There are 3 nitrous passes in this video. I think the chute is dragging quite a bit.

Also looks like i need a new nozzle o ring. The engine doesnt like to idle with the timing backed out. You can hear that too

https://www.youtube.com/watch?v=1_DYcMIkOZ4 (https://www.youtube.com/watch?v=1_DYcMIkOZ4)
Title: Re: reverse chute drag
Post by: FordLover on July 08, 2016, 10:05:50 AM
That is a cool video, so different. Dont get to see that view, EVER.

Little bit of drag, but damn your engine sounds good. Except for idle, lol.
Title: Re: reverse chute drag
Post by: steves86ta on July 08, 2016, 10:33:33 AM
That is a cool video, so different. Dont get to see that view, EVER.

Little bit of drag, but damn your engine sounds good. Except for idle, lol.

yeah she dont like idling at 24*. Since i didnt know where timing was now with the new ignition controller. I was very conservative on the timing. I think i can bump it up to about 28 on the bottle. Need to do a test and tune trip

Let me rephrase. She doesnt like idling at 24* when ive already set the idle pretty low at 30*. I was able to get it to idle about 750-850 rpm at 30* with this new carb. I could probably dial it in to idle with the retard on, but i didnt want to waste time on it.
Title: Re: reverse chute drag
Post by: Jetonthewater16ft on July 08, 2016, 11:20:18 AM
Supercool video!


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