chine walking

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steves86ta

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« on: June 29, 2013, 11:43:35 AM »
Hey guys,
Just got back from Elsinore with the new prop. Which is a little to big (23) pitch. But did get some good solid runs in and she ran a best of 59.6 @4200 so I'm going to go down to a 21 and I think 60 should be no problem. However I did experience a lot of chine walking at around 57+ and for never experiencing it it is a little scary. Slight corrections to the trim and steering took some of it away. My question is will trim tabs help with this? Because it does seem to get more intense with speed.
Thanks
Steve
1980 Bahner 21' Mini Day
1968 Rogers project


Horizonjet

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« Reply #1 on: June 30, 2013, 03:49:18 PM »
Prop?....LOL!

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72 Horizon BBC

GT Jets

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« Reply #2 on: November 17, 2013, 09:17:37 PM »
Hey guys,
Just got back from Elsinore with the new prop. Which is a little to big (23) pitch. But did get some good solid runs in and she ran a best of 59.6 @4200 so I'm going to go down to a 21 and I think 60 should be no problem. However I did experience a lot of chine walking at around 57+ and for never experiencing it it is a little scary. Slight corrections to the trim and steering took some of it away. My question is will trim tabs help with this? Because it does seem to get more intense with speed.
Thanks
Steve


Old thread......

Just stumbled onto it..

Did you get this sorted out?

I chine walk is NOT normal on an I/O, have you inspected the steering bushings in the transom assembly?

Are you sure that you did not experience a "fish tail"...

The 23" pitch prop was obviously way too tall... The 21" should have gotten you stupid close.

This thread is several months old, but wanted to hit on it in case someone else had the same or similar question.

You did not say what drive, Volvo, Mercruiser, OMC etc...

What you describe would be something commonly seen on a boat with a raised "X" dimension.

Just wanted to respond. Bored solid...  :sly:

GT
  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Time to man up and yank it John!  :banghead:
Ray

ka0tyk

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« Reply #3 on: November 17, 2013, 09:21:57 PM »
im putting these on my bahner... no chine walking will be had here! 


steves86ta

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« Reply #4 on: November 17, 2013, 09:22:30 PM »
Gt,

Yeah got it sorted out. My problem was a mix between the 23" prop and to much trim.

She's nice and stable now all the way up to wot

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1980 Bahner 21' Mini Day
1968 Rogers project

ka0tyk

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« Reply #5 on: November 17, 2013, 09:24:24 PM »
Gt,

Yeah got it sorted out. My problem was a mix between the 23" prop and to much trim.

She's nice and stable now all the way up to wot

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what prop are you running now? 

steves86ta

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« Reply #6 on: November 17, 2013, 09:29:28 PM »
Kayotk: I want trim tabs badly, but kinda pricey. I want to do my through transom first

As far as the prop questions. I have three lol

a 19 pitch 3 blade stainless for skiing or tubing. Its a monster out of the hole with this thing.

My favorite prop a 21 pitch 3 blade mirage plus stainless. This thing is perfect, decent hole shot 5400 rpm at WOT maybe a little more

And I still have the 23 pitch 3 blade for long trips (i.e. Laughlin to havasu springs). Its mainly to keep the RPM's down and a higher cruise speed. I typically cruise about 3500-4000 rpm at approx. 45 mph with this. But it is a lot of prop for my little small block
1980 Bahner 21' Mini Day
1968 Rogers project

ka0tyk

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« Reply #7 on: November 17, 2013, 09:35:12 PM »
Kayotk: I want trim tabs badly, but kinda pricey. I want to do my through transom first

As far as the prop questions. I have three lol

a 19 pitch 3 blade stainless for skiing or tubing. Its a monster out of the hole with this thing.

My favorite prop a 21 pitch 3 blade mirage plus stainless. This thing is perfect, decent hole shot 5400 rpm at WOT maybe a little more

And I still have the 23 pitch 3 blade for long trips (i.e. Laughlin to havasu springs). Its mainly to keep the RPM's down and a higher cruise speed. I typically cruise about 3500-4000 rpm at approx. 45 mph with this. But it is a lot of prop for my little small block

damn thats a lot of props! i gotta get a collection like yours!

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« Reply #8 on: November 17, 2013, 09:41:53 PM »
Kayotk: I want trim tabs badly, but kinda pricey. I want to do my through transom first

As far as the prop questions. I have three lol

a 19 pitch 3 blade stainless for skiing or tubing. Its a monster out of the hole with this thing.

My favorite prop a 21 pitch 3 blade mirage plus stainless. This thing is perfect, decent hole shot 5400 rpm at WOT maybe a little more

And I still have the 23 pitch 3 blade for long trips (i.e. Laughlin to havasu springs). Its mainly to keep the RPM's down and a higher cruise speed. I typically cruise about 3500-4000 rpm at approx. 45 mph with this. But it is a lot of prop for my little small block

5400 RPM? You sure? That calcs out to almost 70 MPH.....
  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Time to man up and yank it John!  :banghead:
Ray

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« Reply #9 on: November 17, 2013, 09:45:04 PM »
im putting these on my bahner... no chine walking will be had here! 




K planes are awesome... I have Bennetts on my Carrera, you should not have an issue with chine walk as long as the cavitation plate is below the keel...

It's nice to level out the boat when the big boys are aboard though...  ;)

GT
  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Time to man up and yank it John!  :banghead:
Ray

steves86ta

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« Reply #10 on: November 17, 2013, 10:03:11 PM »
5400 RPM? You sure? That calcs out to almost 70 MPH.....

GT,

Yep. It runs pretty well. Down in blythe, with an empty tank, a 1/4 in the other tank and a fairly empty boat with just me I ran 72.1 on GPS from the island down to Macyntire when the boot ripped and she was taking on water. Trimmed out pretty high and WFO.

According to the engine build we followed (or actually stumbled upon after we built the motor) its making approx 465 horse and 440 ft lbs. Ill find the link later and post it.
1980 Bahner 21' Mini Day
1968 Rogers project

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« Reply #11 on: November 17, 2013, 10:06:40 PM »
GT,

Yep. It runs pretty well. Down in blythe, with an empty tank, a 1/4 in the other tank and a fairly empty boat with just me I ran 72.1 on GPS from the island down to Macyntire when the boot ripped and she was taking on water. Trimmed out pretty high and WFO.

According to the engine build we followed (or actually stumbled upon after we built the motor) its making approx 465 horse and 440 ft lbs. Ill find the link later and post it.

Hoping you have a Bravo in that bad boy... Also a drive shower...

If you have a 1.50:1 drive ratio you would have been spinning closer to 5500 RPM.

Very impressive.  :thumbup:

  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Time to man up and yank it John!  :banghead:
Ray

steves86ta

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« Reply #12 on: November 17, 2013, 10:10:22 PM »
Yeah.... I'm on borrowed time running an mr 1 drive. I keep the oil changed and fresh. Also no hard hits out of the hole only when on plane. And no drive shower yet. But it will come with the new drive. I was a little off on HP I guess closer to 440. Here's a link to the build that is almost identical yo mine

http://www.compcams.com/information/Articles/Type/Chevrolet/CC_CC0902-001.asp

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1980 Bahner 21' Mini Day
1968 Rogers project

GT Jets

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« Reply #13 on: November 17, 2013, 10:16:18 PM »
Yeah.... I'm on borrowed time running an mr 1 drive. I keep the oil changed and fresh. Also no hard hits out of the hole only when on plane. And no drive shower yet. But it will come with the new drive. I was a little off on HP I guess closer to 440. Here's a link to the build that is almost identical yo mine

http://www.compcams.com/information/Articles/Type/Chevrolet/CC_CC0902-001.asp

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Having seen hundreds of these torn down, the failure you will have will be the top vertical shaft bearing, pull it apart and check out it's condition often.

You should install a drive oil reservoir regardless.....  http://www.ebasicpower.com/pc/MER69622A7/MER2E

When you get ready to Bravo that deal, hit me up, I have two drives and have a transom assembly that needs rebuilt.
  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Time to man up and yank it John!  :banghead:
Ray

steves86ta

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« Reply #14 on: November 17, 2013, 10:17:36 PM »
Shoot me some info/price. I'm looking to buy a drive with taxes

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1980 Bahner 21' Mini Day
1968 Rogers project

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« Reply #15 on: November 17, 2013, 10:28:12 PM »
Shoot me some info/price. I'm looking to buy a drive with taxes

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I will, I am in the middle of working out a deal on a bunch of closed boat shop inventory in the coming weeks, I will see what is in there and make you a package deal.

For the drive itself (1996 Bravo I 1.50:1 gears) upper and lower, less prop but new seals and epoxy paint $1000
The water pump is not in the drive on a Bravo, it will need to be crankshaft driven, I have the pump, but will need to scare up the brackets... Right now I only have 454 brackets.

As for the transom assembly, I am in it $200, but will have another $150 in it by the time the smoke clears. New boots, gimball bearing, pivot bushings, and so on. If there is some stuff I can use in the inventory I am trying to get, that will be a bit less...

Will update as information materializes.

GT
  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Time to man up and yank it John!  :banghead:
Ray

steves86ta

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« Reply #16 on: November 17, 2013, 10:49:32 PM »
Sweet. Let me know. Like I said I won't be ready til taxes so we have a little time.

You can pm me or call/text me too. Cell is 909-705-9077

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1980 Bahner 21' Mini Day
1968 Rogers project

ka0tyk

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« Reply #17 on: November 17, 2013, 10:50:16 PM »
Having seen hundreds of these torn down, the failure you will have will be the top vertical shaft bearing, pull it apart and check out it's condition often.

You should install a drive oil reservoir regardless.....  http://www.ebasicpower.com/pc/MER69622A7/MER2E

When you get ready to Bravo that deal, hit me up, I have two drives and have a transom assembly that needs rebuilt.

dont all drives have an oil resivoir?  i have one with my alpha...

steves86ta

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« Reply #18 on: November 17, 2013, 10:52:33 PM »
I guess not the old ass mr1s lol. Mine doesn't.

I meant to reply to you earlier. You really don't need a collection of props like I have. I usually leave the 21 on for everything. But always carry an extra.

Last river trip I spun a 21 I had just bought. So it was nice having an extra

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1980 Bahner 21' Mini Day
1968 Rogers project

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« Reply #19 on: November 17, 2013, 11:33:13 PM »
dont all drives have an oil resivoir?  i have one with my alpha...

They didn't start making the reservoir standard until about 1996, before that it was an accessory, many boat manufacturers added them to the package because it was such an inexpensive upgrade at time of purchase. Both our I/O boats have them, along with the alarm buzzer option. They are both 1997 drives. My recently acquired 1986 Cobalt does not have the reservoir.

GT
  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Time to man up and yank it John!  :banghead:
Ray

 


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