User Tag List
Results 16 to 30 of 39
-
11-27-2022, 11:23 PM #16
Is it an optical illusion or is the whole skeg offset to starboard?
1990 Shadow bass boat w/ 2.4 200 Merc. Totally resto'd boat and love it!
-
11-27-2022, 11:35 PM #17
-
rgsauger liked this post
-
11-27-2022, 11:51 PM #18
Thanks. Good looking case
1990 Shadow bass boat w/ 2.4 200 Merc. Totally resto'd boat and love it!
-
CI STV liked this post
-
11-28-2022, 06:03 AM #19
Thanks. It was a real piece of junk when I got it. I did a whole thread on here about it. Bought it from a S&F member as a “freshly-built” unit and when I went to install it, I found it was leaking from a crack in the case near the lower pinion bearing area. The oil inside was littered with metal shavings (steel and aluminum). Real sh!tshow.
Pulled it down about a month ago and found that the driveshaft was junk as well, since it was cut too short (looks like he just guessed what it needed to be and cut it, forgetting to add 5/8” for the adaptor plate thickness) and the the shaft had a groove and was pitted badly in the seal area. The gears (SM 2:1 gears cut down) didn’t look the best and neither did the propshaft. So we cleaned it out, got the crack welded, changed the driveshaft and bearings and we’re going to test it to see how long it holds up. I might as well get some use out if it, since I have well over $5K in it.
Going to use it only for 800ft drag racing, so hoping it will hold up.
I have another XR6 unit that I’m rebuilding now with brand new 1.78 gears and all new bearings, clutch etc. so, if/when this one blows, I’ll have a backup.Last edited by CI STV; 11-28-2022 at 06:08 AM.
-
11-28-2022, 03:27 PM #20Screaming And Flying!
- Join Date
- Jul 2004
- Location
- Connecticut
- Posts
- 6,009
- Thanks (Given)
- 465
- Thanks (Received)
- 168
- Likes (Given)
- 911
- Likes (Received)
- 951
- Mentioned
- 1 Post(s)
- Tagged
- 0 Thread(s)
If you all keep talking about performance boating stuff on a boating forum I will have to report you
-
11-28-2022, 03:42 PM #21
-
11-28-2022, 11:18 PM #22
Everybody just SHUT UP!!!
oops, wrong forum. As you were…1990 Shadow bass boat w/ 2.4 200 Merc. Totally resto'd boat and love it!
-
-
11-28-2022, 11:34 PM #23
You guys are hilarious.
Now, how about we start talking politics?
-
11-29-2022, 07:45 AM #24
hell no
Team Junk
No sparkling wiggles in here, only dump truck grinches.
"Screamin Heathen"
-
11-29-2022, 09:48 AM #25
Okay, now that we got that out of the way…
Once I get the other case together, I’m going to do some testing to see which works best/is more efficient: the 2:1 XR6 with a 24P Yamaha, or the 1.78 XR6 with a 20P Yamaha.
I’ll probably start a separate thread to document what I find out, and I’ll include datalogs to verify the results.
To try to “level the playing field”, I’m probably going to plug and fill the outer 2 of the 5 holes in the Bob”s nosecone on the 1.78 case, since I’ve already enlarged the 3 middle ones, like this:
The weird thing is that this setup is pretty damn efficient, with prop slip at only 7%, as you can see from the screen shots of a datalog and the prop slip calculator posted below. This was using a Ronnie Gilbert 20P drag prop:
Last edited by CI STV; 11-29-2022 at 09:50 AM.
-
11-29-2022, 09:55 AM #26
-
11-29-2022, 10:06 AM #27
Couple of things to note regarding the above test data:
(1) I think the prop slip is that low because I’m running the case a little deeper than optimum.
I say that because when I tried running the gearcase a little higher, the water pressure dropped quite a bit, to like 14-15psi, IIRC. I had a discussion with some really competent folks on these forums about it and the consensus was that I should plug the 2 outer holes on the side of the nosecone, as they may be sucking air when the gearcase is run “where it needs to be”: @ ~1 3/8” above the pad on my STV.
(2) The data point shown on that screen shot is somewhere beyond 700’ mark and approaching the finish line on a marked 800’ course, and that shows what the boat was running right before it hit the 10K limiter that I didn’t know the ACU had in it. I’ve fixed the rev limiter issue now, so I should be see what each gearcase/prop combo can do in the 800’ when I get it going again.
-
11-29-2022, 10:11 AM #28Screaming And Flying!
- Join Date
- Jul 2004
- Location
- Connecticut
- Posts
- 6,009
- Thanks (Given)
- 465
- Thanks (Received)
- 168
- Likes (Given)
- 911
- Likes (Received)
- 951
- Mentioned
- 1 Post(s)
- Tagged
- 0 Thread(s)
You are doing some top shelf work, thank for posting it up
-
CI STV thanked for this post
-
11-29-2022, 10:18 AM #29
-
LakeFever liked this post
-
11-29-2022, 10:30 AM #30
I'm convinced Bob's used 5 holes in order to satisfy a very wide range of conditions and avoid lawsuits from overheated powerheads. 5 holes in most cases are completely unnecessary, so go ahead and plug em.
As far as prop slip goes, it's something to be used for amusement and nothing else. Unless your tach and prop are laboratory quality, the numbers you insert in the calculator are just guesses. I've seen boats set best top speeds with terrible slip numbers (over 15%) so slip calculations are a waste of time to me. If you put a prop on that runs 3 MPH faster but the slip is "bad", do we throw it in the dumpster?Living in the Freedom provided by Bud Conner and his fellow warriors.
R.I.P. my Heathen Brother
Similar Threads
-
bob's nosecone/low water pickup installation
By reacler in forum Props, Setup, and RiggingReplies: 6Last Post: 05-08-2020, 09:35 PM -
Mud or sand in low water pickup nosecone
By The Bilge Idiot in forum Technical DiscussionReplies: 10Last Post: 09-04-2006, 01:54 PM -
Aftermarket low water pickup nosecone help
By Mr Walker in forum Technical DiscussionReplies: 7Last Post: 06-30-2006, 09:03 AM -
Aftermarket low water pickup nosecone help
By australian ski racer in forum Technical DiscussionReplies: 0Last Post: 06-20-2006, 06:55 AM